To be of use with {@link android.content.Context#startActivity Context.startActivity()}, all
* activity classes must have a corresponding
* {@link android.R.styleable#AndroidManifestActivity <activity>}
* declaration in their package's AndroidManifest.xml.
The Activity class is an important part of an application's overall lifecycle, * and the way activities are launched and put together is a fundamental * part of the platform's application model. For a detailed perspective on the structure of * Android applications and lifecycles, please read the Dev Guide document on * Application Fundamentals.
* *Topics covered here: *
Activities in the system are managed as an activity stack. * When a new activity is started, it is placed on the top of the stack * and becomes the running activity -- the previous activity always remains * below it in the stack, and will not come to the foreground again until * the new activity exits.
* *An activity has essentially four states:
*The following diagram shows the important state paths of an Activity. * The square rectangles represent callback methods you can implement to * perform operations when the Activity moves between states. The colored * ovals are major states the Activity can be in.
* *
There are three key loops you may be interested in monitoring within your * activity: * *
The entire lifecycle of an activity is defined by the following * Activity methods. All of these are hooks that you can override * to do appropriate work when the activity changes state. All * activities will implement {@link android.app.Activity#onCreate} * to do their initial setup; many will also implement * {@link android.app.Activity#onPause} to commit changes to data and * otherwise prepare to stop interacting with the user. You should always * call up to your superclass when implementing these methods.
* * *
* public class Activity extends ApplicationContext {
* protected void onCreate(Bundle savedInstanceState);
*
* protected void onStart();
*
* protected void onRestart();
*
* protected void onResume();
*
* protected void onPause();
*
* protected void onStop();
*
* protected void onDestroy();
* }
*
*
* In general the movement through an activity's lifecycle looks like * this:
* *| Method | Description | Killable? | Next | ||
|---|---|---|---|---|---|
| {@link android.app.Activity#onCreate onCreate()} | *Called when the activity is first created.
* This is where you should do all of your normal static set up:
* create views, bind data to lists, etc. This method also
* provides you with a Bundle containing the activity's previously
* frozen state, if there was one.
* Always followed by |
* No | *onStart() |
* ||
| * | {@link android.app.Activity#onRestart onRestart()} | *Called after your activity has been stopped, prior to it being
* started again.
* Always followed by |
* No | *onStart() |
* |
| {@link android.app.Activity#onStart onStart()} | *Called when the activity is becoming visible to the user.
* Followed by |
* No | *onResume() or onStop() |
* ||
| * | {@link android.app.Activity#onResume onResume()} | *Called when the activity will start
* interacting with the user. At this point your activity is at
* the top of the activity stack, with user input going to it.
* Always followed by |
* No | *onPause() |
* |
| {@link android.app.Activity#onPause onPause()} | *Called when the system is about to start resuming a previous
* activity. This is typically used to commit unsaved changes to
* persistent data, stop animations and other things that may be consuming
* CPU, etc. Implementations of this method must be very quick because
* the next activity will not be resumed until this method returns.
* Followed by either |
* Yes | *onResume() or* onStop() |
* ||
| {@link android.app.Activity#onStop onStop()} | *Called when the activity is no longer visible to the user, because
* another activity has been resumed and is covering this one. This
* may happen either because a new activity is being started, an existing
* one is being brought in front of this one, or this one is being
* destroyed.
* Followed by either |
* Yes | *onRestart() or* onDestroy() |
* ||
| {@link android.app.Activity#onDestroy onDestroy()} | *The final call you receive before your * activity is destroyed. This can happen either because the * activity is finishing (someone called {@link Activity#finish} on * it, or because the system is temporarily destroying this * instance of the activity to save space. You can distinguish * between these two scenarios with the {@link * Activity#isFinishing} method. | *Yes | *nothing | *||
Note the "Killable" column in the above table -- for those methods that * are marked as being killable, after that method returns the process hosting the * activity may killed by the system at any time without another line * of its code being executed. Because of this, you should use the * {@link #onPause} method to write any persistent data (such as user edits) * to storage. In addition, the method * {@link #onSaveInstanceState(Bundle)} is called before placing the activity * in such a background state, allowing you to save away any dynamic instance * state in your activity into the given Bundle, to be later received in * {@link #onCreate} if the activity needs to be re-created. * See the Process Lifecycle * section for more information on how the lifecycle of a process is tied * to the activities it is hosting. Note that it is important to save * persistent data in {@link #onPause} instead of {@link #onSaveInstanceState} * because the later is not part of the lifecycle callbacks, so will not * be called in every situation as described in its documentation.
* *For those methods that are not marked as being killable, the activity's
* process will not be killed by the system starting from the time the method
* is called and continuing after it returns. Thus an activity is in the killable
* state, for example, between after onPause() to the start of
* onResume().
If the configuration of the device (as defined by the * {@link Configuration Resources.Configuration} class) changes, * then anything displaying a user interface will need to update to match that * configuration. Because Activity is the primary mechanism for interacting * with the user, it includes special support for handling configuration * changes.
* *Unless you specify otherwise, a configuration change (such as a change * in screen orientation, language, input devices, etc) will cause your * current activity to be destroyed, going through the normal activity * lifecycle process of {@link #onPause}, * {@link #onStop}, and {@link #onDestroy} as appropriate. If the activity * had been in the foreground or visible to the user, once {@link #onDestroy} is * called in that instance then a new instance of the activity will be * created, with whatever savedInstanceState the previous instance had generated * from {@link #onSaveInstanceState}.
* *This is done because any application resource, * including layout files, can change based on any configuration value. Thus * the only safe way to handle a configuration change is to re-retrieve all * resources, including layouts, drawables, and strings. Because activities * must already know how to save their state and re-create themselves from * that state, this is a convenient way to have an activity restart itself * with a new configuration.
* *In some special cases, you may want to bypass restarting of your * activity based on one or more types of configuration changes. This is * done with the {@link android.R.attr#configChanges android:configChanges} * attribute in its manifest. For any types of configuration changes you say * that you handle there, you will receive a call to your current activity's * {@link #onConfigurationChanged} method instead of being restarted. If * a configuration change involves any that you do not handle, however, the * activity will still be restarted and {@link #onConfigurationChanged} * will not be called.
* * *The {@link android.app.Activity#startActivity} * method is used to start a * new activity, which will be placed at the top of the activity stack. It * takes a single argument, an {@link android.content.Intent Intent}, * which describes the activity * to be executed.
* *Sometimes you want to get a result back from an activity when it * ends. For example, you may start an activity that lets the user pick * a person in a list of contacts; when it ends, it returns the person * that was selected. To do this, you call the * {@link android.app.Activity#startActivityForResult(Intent, int)} * version with a second integer parameter identifying the call. The result * will come back through your {@link android.app.Activity#onActivityResult} * method.
* *When an activity exits, it can call
* {@link android.app.Activity#setResult(int)}
* to return data back to its parent. It must always supply a result code,
* which can be the standard results RESULT_CANCELED, RESULT_OK, or any
* custom values starting at RESULT_FIRST_USER. In addition, it can optionally
* return back an Intent containing any additional data it wants. All of this
* information appears back on the
* parent's Activity.onActivityResult(), along with the integer
* identifier it originally supplied.
If a child activity fails for any reason (such as crashing), the parent * activity will receive a result with the code RESULT_CANCELED.
* *
* public class MyActivity extends Activity {
* ...
*
* static final int PICK_CONTACT_REQUEST = 0;
*
* protected boolean onKeyDown(int keyCode, KeyEvent event) {
* if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
* // When the user center presses, let them pick a contact.
* startActivityForResult(
* new Intent(Intent.ACTION_PICK,
* new Uri("content://contacts")),
* PICK_CONTACT_REQUEST);
* return true;
* }
* return false;
* }
*
* protected void onActivityResult(int requestCode, int resultCode,
* Intent data) {
* if (requestCode == PICK_CONTACT_REQUEST) {
* if (resultCode == RESULT_OK) {
* // A contact was picked. Here we will just display it
* // to the user.
* startActivity(new Intent(Intent.ACTION_VIEW, data));
* }
* }
* }
* }
*
*
*
* There are generally two kinds of persistent state than an activity * will deal with: shared document-like data (typically stored in a SQLite * database using a {@linkplain android.content.ContentProvider content provider}) * and internal state such as user preferences.
* *For content provider data, we suggest that activities use a * "edit in place" user model. That is, any edits a user makes are effectively * made immediately without requiring an additional confirmation step. * Supporting this model is generally a simple matter of following two rules:
* *When creating a new document, the backing database entry or file for * it is created immediately. For example, if the user chooses to write * a new e-mail, a new entry for that e-mail is created as soon as they * start entering data, so that if they go to any other activity after * that point this e-mail will now appear in the list of drafts.
*When an activity's onPause() method is called, it should
* commit to the backing content provider or file any changes the user
* has made. This ensures that those changes will be seen by any other
* activity that is about to run. You will probably want to commit
* your data even more aggressively at key times during your
* activity's lifecycle: for example before starting a new
* activity, before finishing your own activity, when the user
* switches between input fields, etc.
This model is designed to prevent data loss when a user is navigating * between activities, and allows the system to safely kill an activity (because * system resources are needed somewhere else) at any time after it has been * paused. Note this implies * that the user pressing BACK from your activity does not * mean "cancel" -- it means to leave the activity with its current contents * saved away. Cancelling edits in an activity must be provided through * some other mechanism, such as an explicit "revert" or "undo" option.
* *See the {@linkplain android.content.ContentProvider content package} for * more information about content providers. These are a key aspect of how * different activities invoke and propagate data between themselves.
* *The Activity class also provides an API for managing internal persistent state * associated with an activity. This can be used, for example, to remember * the user's preferred initial display in a calendar (day view or week view) * or the user's default home page in a web browser.
* *Activity persistent state is managed * with the method {@link #getPreferences}, * allowing you to retrieve and * modify a set of name/value pairs associated with the activity. To use * preferences that are shared across multiple application components * (activities, receivers, services, providers), you can use the underlying * {@link Context#getSharedPreferences Context.getSharedPreferences()} method * to retrieve a preferences * object stored under a specific name. * (Note that it is not possible to share settings data across application * packages -- for that you will need a content provider.)
* *Here is an excerpt from a calendar activity that stores the user's * preferred view mode in its persistent settings:
* *
* public class CalendarActivity extends Activity {
* ...
*
* static final int DAY_VIEW_MODE = 0;
* static final int WEEK_VIEW_MODE = 1;
*
* private SharedPreferences mPrefs;
* private int mCurViewMode;
*
* protected void onCreate(Bundle savedInstanceState) {
* super.onCreate(savedInstanceState);
*
* SharedPreferences mPrefs = getSharedPreferences();
* mCurViewMode = mPrefs.getInt("view_mode" DAY_VIEW_MODE);
* }
*
* protected void onPause() {
* super.onPause();
*
* SharedPreferences.Editor ed = mPrefs.edit();
* ed.putInt("view_mode", mCurViewMode);
* ed.commit();
* }
* }
*
*
*
* The ability to start a particular Activity can be enforced when it is * declared in its * manifest's {@link android.R.styleable#AndroidManifestActivity <activity>} * tag. By doing so, other applications will need to declare a corresponding * {@link android.R.styleable#AndroidManifestUsesPermission <uses-permission>} * element in their own manifest to be able to start that activity. * *
See the Security and Permissions * document for more information on permissions and security in general. * * *
The Android system attempts to keep application process around for as * long as possible, but eventually will need to remove old processes when * memory runs low. As described in Activity * Lifecycle, the decision about which process to remove is intimately * tied to the state of the user's interaction with it. In general, there * are four states a process can be in based on the activities running in it, * listed here in order of importance. The system will kill less important * processes (the last ones) before it resorts to killing more important * processes (the first ones). * *
The foreground activity (the activity at the top of the screen * that the user is currently interacting with) is considered the most important. * Its process will only be killed as a last resort, if it uses more memory * than is available on the device. Generally at this point the device has * reached a memory paging state, so this is required in order to keep the user * interface responsive. *
A visible activity (an activity that is visible to the user * but not in the foreground, such as one sitting behind a foreground dialog) * is considered extremely important and will not be killed unless that is * required to keep the foreground activity running. *
A background activity (an activity that is not visible to * the user and has been paused) is no longer critical, so the system may * safely kill its process to reclaim memory for other foreground or * visible processes. If its process needs to be killed, when the user navigates * back to the activity (making it visible on the screen again), its * {@link #onCreate} method will be called with the savedInstanceState it had previously * supplied in {@link #onSaveInstanceState} so that it can restart itself in the same * state as the user last left it. *
An empty process is one hosting no activities or other * application components (such as {@link Service} or * {@link android.content.BroadcastReceiver} classes). These are killed very * quickly by the system as memory becomes low. For this reason, any * background operation you do outside of an activity must be executed in the * context of an activity BroadcastReceiver or Service to ensure that the system * knows it needs to keep your process around. *
Sometimes an Activity may need to do a long-running operation that exists
* independently of the activity lifecycle itself. An example may be a camera
* application that allows you to upload a picture to a web site. The upload
* may take a long time, and the application should allow the user to leave
* the application will it is executing. To accomplish this, your Activity
* should start a {@link Service} in which the upload takes place. This allows
* the system to properly prioritize your process (considering it to be more
* important than other non-visible applications) for the duration of the
* upload, independent of whether the original activity is paused, stopped,
* or finished.
*/
public class Activity extends ContextThemeWrapper
implements LayoutInflater.Factory,
Window.Callback, KeyEvent.Callback,
OnCreateContextMenuListener, ComponentCallbacks {
private static final String TAG = "Activity";
/** Standard activity result: operation canceled. */
public static final int RESULT_CANCELED = 0;
/** Standard activity result: operation succeeded. */
public static final int RESULT_OK = -1;
/** Start of user-defined activity results. */
public static final int RESULT_FIRST_USER = 1;
private static long sInstanceCount = 0;
private static final String WINDOW_HIERARCHY_TAG = "android:viewHierarchyState";
private static final String SAVED_DIALOG_IDS_KEY = "android:savedDialogIds";
private static final String SAVED_DIALOGS_TAG = "android:savedDialogs";
private static final String SAVED_DIALOG_KEY_PREFIX = "android:dialog_";
private static final String SAVED_DIALOG_ARGS_KEY_PREFIX = "android:dialog_args_";
private static class ManagedDialog {
Dialog mDialog;
Bundle mArgs;
}
private SparseArray You can call {@link #finish} from within this function, in
* which case onDestroy() will be immediately called without any of the rest
* of the activity lifecycle ({@link #onStart}, {@link #onResume},
* {@link #onPause}, etc) executing.
*
* Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. This method is called between {@link #onStart} and
* {@link #onPostCreate}.
*
* @param savedInstanceState the data most recently supplied in {@link #onSaveInstanceState}.
*
* @see #onCreate
* @see #onPostCreate
* @see #onResume
* @see #onSaveInstanceState
*/
protected void onRestoreInstanceState(Bundle savedInstanceState) {
if (mWindow != null) {
Bundle windowState = savedInstanceState.getBundle(WINDOW_HIERARCHY_TAG);
if (windowState != null) {
mWindow.restoreHierarchyState(windowState);
}
}
}
/**
* Restore the state of any saved managed dialogs.
*
* @param savedInstanceState The bundle to restore from.
*/
private void restoreManagedDialogs(Bundle savedInstanceState) {
final Bundle b = savedInstanceState.getBundle(SAVED_DIALOGS_TAG);
if (b == null) {
return;
}
final int[] ids = b.getIntArray(SAVED_DIALOG_IDS_KEY);
final int numDialogs = ids.length;
mManagedDialogs = new SparseArray Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. For activities that are using raw {@link Cursor} objects (instead of
* creating them through
* {@link #managedQuery(android.net.Uri , String[], String, String[], String)},
* this is usually the place
* where the cursor should be requeried (because you had deactivated it in
* {@link #onStop}.
*
* Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. Keep in mind that onResume is not the best indicator that your activity
* is visible to the user; a system window such as the keyguard may be in
* front. Use {@link #onWindowFocusChanged} to know for certain that your
* activity is visible to the user (for example, to resume a game).
*
* Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. An activity will always be paused before receiving a new intent, so
* you can count on {@link #onResume} being called after this method.
*
* Note that {@link #getIntent} still returns the original Intent. You
* can use {@link #setIntent} to update it to this new Intent.
*
* @param intent The new intent that was started for the activity.
*
* @see #getIntent
* @see #setIntent
* @see #onResume
*/
protected void onNewIntent(Intent intent) {
}
/**
* The hook for {@link ActivityThread} to save the state of this activity.
*
* Calls {@link #onSaveInstanceState(android.os.Bundle)}
* and {@link #saveManagedDialogs(android.os.Bundle)}.
*
* @param outState The bundle to save the state to.
*/
final void performSaveInstanceState(Bundle outState) {
onSaveInstanceState(outState);
saveManagedDialogs(outState);
}
/**
* Called to retrieve per-instance state from an activity before being killed
* so that the state can be restored in {@link #onCreate} or
* {@link #onRestoreInstanceState} (the {@link Bundle} populated by this method
* will be passed to both).
*
* This method is called before an activity may be killed so that when it
* comes back some time in the future it can restore its state. For example,
* if activity B is launched in front of activity A, and at some point activity
* A is killed to reclaim resources, activity A will have a chance to save the
* current state of its user interface via this method so that when the user
* returns to activity A, the state of the user interface can be restored
* via {@link #onCreate} or {@link #onRestoreInstanceState}.
*
* Do not confuse this method with activity lifecycle callbacks such as
* {@link #onPause}, which is always called when an activity is being placed
* in the background or on its way to destruction, or {@link #onStop} which
* is called before destruction. One example of when {@link #onPause} and
* {@link #onStop} is called and not this method is when a user navigates back
* from activity B to activity A: there is no need to call {@link #onSaveInstanceState}
* on B because that particular instance will never be restored, so the
* system avoids calling it. An example when {@link #onPause} is called and
* not {@link #onSaveInstanceState} is when activity B is launched in front of activity A:
* the system may avoid calling {@link #onSaveInstanceState} on activity A if it isn't
* killed during the lifetime of B since the state of the user interface of
* A will stay intact.
*
* The default implementation takes care of most of the UI per-instance
* state for you by calling {@link android.view.View#onSaveInstanceState()} on each
* view in the hierarchy that has an id, and by saving the id of the currently
* focused view (all of which is restored by the default implementation of
* {@link #onRestoreInstanceState}). If you override this method to save additional
* information not captured by each individual view, you will likely want to
* call through to the default implementation, otherwise be prepared to save
* all of the state of each view yourself.
*
* If called, this method will occur before {@link #onStop}. There are
* no guarantees about whether it will occur before or after {@link #onPause}.
*
* @param outState Bundle in which to place your saved state.
*
* @see #onCreate
* @see #onRestoreInstanceState
* @see #onPause
*/
protected void onSaveInstanceState(Bundle outState) {
outState.putBundle(WINDOW_HIERARCHY_TAG, mWindow.saveHierarchyState());
}
/**
* Save the state of any managed dialogs.
*
* @param outState place to store the saved state.
*/
private void saveManagedDialogs(Bundle outState) {
if (mManagedDialogs == null) {
return;
}
final int numDialogs = mManagedDialogs.size();
if (numDialogs == 0) {
return;
}
Bundle dialogState = new Bundle();
int[] ids = new int[mManagedDialogs.size()];
// save each dialog's bundle, gather the ids
for (int i = 0; i < numDialogs; i++) {
final int key = mManagedDialogs.keyAt(i);
ids[i] = key;
final ManagedDialog md = mManagedDialogs.valueAt(i);
dialogState.putBundle(savedDialogKeyFor(key), md.mDialog.onSaveInstanceState());
if (md.mArgs != null) {
dialogState.putBundle(savedDialogArgsKeyFor(key), md.mArgs);
}
}
dialogState.putIntArray(SAVED_DIALOG_IDS_KEY, ids);
outState.putBundle(SAVED_DIALOGS_TAG, dialogState);
}
/**
* Called as part of the activity lifecycle when an activity is going into
* the background, but has not (yet) been killed. The counterpart to
* {@link #onResume}.
*
* When activity B is launched in front of activity A, this callback will
* be invoked on A. B will not be created until A's {@link #onPause} returns,
* so be sure to not do anything lengthy here.
*
* This callback is mostly used for saving any persistent state the
* activity is editing, to present a "edit in place" model to the user and
* making sure nothing is lost if there are not enough resources to start
* the new activity without first killing this one. This is also a good
* place to do things like stop animations and other things that consume a
* noticeable mount of CPU in order to make the switch to the next activity
* as fast as possible, or to close resources that are exclusive access
* such as the camera.
*
* In situations where the system needs more memory it may kill paused
* processes to reclaim resources. Because of this, you should be sure
* that all of your state is saved by the time you return from
* this function. In general {@link #onSaveInstanceState} is used to save
* per-instance state in the activity and this method is used to store
* global persistent data (in content providers, files, etc.)
*
* After receiving this call you will usually receive a following call
* to {@link #onStop} (after the next activity has been resumed and
* displayed), however in some cases there will be a direct call back to
* {@link #onResume} without going through the stopped state.
*
* Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. This callback and {@link #onUserInteraction} are intended to help
* activities manage status bar notifications intelligently; specifically,
* for helping activities determine the proper time to cancel a notfication.
*
* @see #onUserInteraction()
*/
protected void onUserLeaveHint() {
}
/**
* Generate a new thumbnail for this activity. This method is called before
* pausing the activity, and should draw into outBitmap the
* imagery for the desired thumbnail in the dimensions of that bitmap. It
* can use the given canvas, which is configured to draw into the
* bitmap, for rendering if desired.
*
* The default implementation renders the Screen's current view
* hierarchy into the canvas to generate a thumbnail.
*
* If you return false, the bitmap will be filled with a default
* thumbnail.
*
* @param outBitmap The bitmap to contain the thumbnail.
* @param canvas Can be used to render into the bitmap.
*
* @return Return true if you have drawn into the bitmap; otherwise after
* you return it will be filled with a default thumbnail.
*
* @see #onCreateDescription
* @see #onSaveInstanceState
* @see #onPause
*/
public boolean onCreateThumbnail(Bitmap outBitmap, Canvas canvas) {
if (mDecor == null) {
return false;
}
int paddingLeft = 0;
int paddingRight = 0;
int paddingTop = 0;
int paddingBottom = 0;
// Find System window and use padding so we ignore space reserved for decorations
// like the status bar and such.
final FrameLayout top = (FrameLayout) mDecor;
for (int i = 0; i < top.getChildCount(); i++) {
View child = top.getChildAt(i);
if (child.isFitsSystemWindowsFlagSet()) {
paddingLeft = child.getPaddingLeft();
paddingRight = child.getPaddingRight();
paddingTop = child.getPaddingTop();
paddingBottom = child.getPaddingBottom();
break;
}
}
final int visibleWidth = mDecor.getWidth() - paddingLeft - paddingRight;
final int visibleHeight = mDecor.getHeight() - paddingTop - paddingBottom;
canvas.save();
canvas.scale( (float) outBitmap.getWidth() / visibleWidth,
(float) outBitmap.getHeight() / visibleHeight);
canvas.translate(-paddingLeft, -paddingTop);
mDecor.draw(canvas);
canvas.restore();
return true;
}
/**
* Generate a new description for this activity. This method is called
* before pausing the activity and can, if desired, return some textual
* description of its current state to be displayed to the user.
*
* The default implementation returns null, which will cause you to
* inherit the description from the previous activity. If all activities
* return null, generally the label of the top activity will be used as the
* description.
*
* @return A description of what the user is doing. It should be short and
* sweet (only a few words).
*
* @see #onCreateThumbnail
* @see #onSaveInstanceState
* @see #onPause
*/
public CharSequence onCreateDescription() {
return null;
}
/**
* Called when you are no longer visible to the user. You will next
* receive either {@link #onRestart}, {@link #onDestroy}, or nothing,
* depending on later user activity.
*
* Note that this method may never be called, in low memory situations
* where the system does not have enough memory to keep your activity's
* process running after its {@link #onPause} method is called.
*
* Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. Note: do not count on this method being called as a place for
* saving data! For example, if an activity is editing data in a content
* provider, those edits should be committed in either {@link #onPause} or
* {@link #onSaveInstanceState}, not here. This method is usually implemented to
* free resources like threads that are associated with an activity, so
* that a destroyed activity does not leave such things around while the
* rest of its application is still running. There are situations where
* the system will simply kill the activity's hosting process without
* calling this method (or any others) in it, so it should not be used to
* do things that are intended to remain around after the process goes
* away.
*
* Derived classes must call through to the super class's
* implementation of this method. If they do not, an exception will be
* thrown. At the time that this function has been called, your Resources
* object will have been updated to return resource values matching the
* new configuration.
*
* @param newConfig The new device configuration.
*/
public void onConfigurationChanged(Configuration newConfig) {
mCalled = true;
if (mWindow != null) {
// Pass the configuration changed event to the window
mWindow.onConfigurationChanged(newConfig);
}
}
/**
* If this activity is being destroyed because it can not handle a
* configuration parameter being changed (and thus its
* {@link #onConfigurationChanged(Configuration)} method is
* not being called), then you can use this method to discover
* the set of changes that have occurred while in the process of being
* destroyed. Note that there is no guarantee that these will be
* accurate (other changes could have happened at any time), so you should
* only use this as an optimization hint.
*
* @return Returns a bit field of the configuration parameters that are
* changing, as defined by the {@link android.content.res.Configuration}
* class.
*/
public int getChangingConfigurations() {
return mConfigChangeFlags;
}
/**
* Retrieve the non-configuration instance data that was previously
* returned by {@link #onRetainNonConfigurationInstance()}. This will
* be available from the initial {@link #onCreate} and
* {@link #onStart} calls to the new instance, allowing you to extract
* any useful dynamic state from the previous instance.
*
* Note that the data you retrieve here should only be used
* as an optimization for handling configuration changes. You should always
* be able to handle getting a null pointer back, and an activity must
* still be able to restore itself to its previous state (through the
* normal {@link #onSaveInstanceState(Bundle)} mechanism) even if this
* function returns null.
*
* @return Returns the object previously returned by
* {@link #onRetainNonConfigurationInstance()}.
*/
public Object getLastNonConfigurationInstance() {
return mLastNonConfigurationInstance;
}
/**
* Called by the system, as part of destroying an
* activity due to a configuration change, when it is known that a new
* instance will immediately be created for the new configuration. You
* can return any object you like here, including the activity instance
* itself, which can later be retrieved by calling
* {@link #getLastNonConfigurationInstance()} in the new activity
* instance.
*
* This function is called purely as an optimization, and you must
* not rely on it being called. When it is called, a number of guarantees
* will be made to help optimize configuration switching:
* These guarantees are designed so that an activity can use this API
* to propagate extensive state from the old to new activity instance, from
* loaded bitmaps, to network connections, to evenly actively running
* threads. Note that you should not propagate any data that
* may change based on the configuration, including any data loaded from
* resources such as strings, layouts, or drawables.
*
* The guarantee of no message handling during the switch to the next
* activity simplifies use with active objects. For example if your retained
* state is an {@link android.os.AsyncTask} you are guaranteed that its
* call back functions (like {@link android.os.AsyncTask#onPostExecute}) will
* not be called from the call here until you execute the next instance's
* {@link #onCreate(Bundle)}. (Note however that there is of course no such
* guarantee for {@link android.os.AsyncTask#doInBackground} since that is
* running in a separate thread.)
*
* @return Return any Object holding the desired state to propagate to the
* next activity instance.
*/
public Object onRetainNonConfigurationInstance() {
return null;
}
/**
* Retrieve the non-configuration instance data that was previously
* returned by {@link #onRetainNonConfigurationChildInstances()}. This will
* be available from the initial {@link #onCreate} and
* {@link #onStart} calls to the new instance, allowing you to extract
* any useful dynamic state from the previous instance.
*
* Note that the data you retrieve here should only be used
* as an optimization for handling configuration changes. You should always
* be able to handle getting a null pointer back, and an activity must
* still be able to restore itself to its previous state (through the
* normal {@link #onSaveInstanceState(Bundle)} mechanism) even if this
* function returns null.
*
* @return Returns the object previously returned by
* {@link #onRetainNonConfigurationChildInstances()}
*/
HashMap See {@link android.app.SearchManager android.app.SearchManager} for more details.
*
* @see #setDefaultKeyMode
*/
static public final int DEFAULT_KEYS_SEARCH_LOCAL = 3;
/**
* Use with {@link #setDefaultKeyMode} to specify that unhandled keystrokes
* will start a global search (typically web search, but some platforms may define alternate
* methods for global search)
*
* See {@link android.app.SearchManager android.app.SearchManager} for more details.
*
* @see #setDefaultKeyMode
*/
static public final int DEFAULT_KEYS_SEARCH_GLOBAL = 4;
/**
* Select the default key handling for this activity. This controls what
* will happen to key events that are not otherwise handled. The default
* mode ({@link #DEFAULT_KEYS_DISABLE}) will simply drop them on the
* floor. Other modes allow you to launch the dialer
* ({@link #DEFAULT_KEYS_DIALER}), execute a shortcut in your options
* menu without requiring the menu key be held down
* ({@link #DEFAULT_KEYS_SHORTCUT}), or launch a search ({@link #DEFAULT_KEYS_SEARCH_LOCAL}
* and {@link #DEFAULT_KEYS_SEARCH_GLOBAL}).
*
* Note that the mode selected here does not impact the default
* handling of system keys, such as the "back" and "menu" keys, and your
* activity and its views always get a first chance to receive and handle
* all application keys.
*
* @param mode The desired default key mode constant.
*
* @see #DEFAULT_KEYS_DISABLE
* @see #DEFAULT_KEYS_DIALER
* @see #DEFAULT_KEYS_SHORTCUT
* @see #DEFAULT_KEYS_SEARCH_LOCAL
* @see #DEFAULT_KEYS_SEARCH_GLOBAL
* @see #onKeyDown
*/
public final void setDefaultKeyMode(int mode) {
mDefaultKeyMode = mode;
// Some modes use a SpannableStringBuilder to track & dispatch input events
// This list must remain in sync with the switch in onKeyDown()
switch (mode) {
case DEFAULT_KEYS_DISABLE:
case DEFAULT_KEYS_SHORTCUT:
mDefaultKeySsb = null; // not used in these modes
break;
case DEFAULT_KEYS_DIALER:
case DEFAULT_KEYS_SEARCH_LOCAL:
case DEFAULT_KEYS_SEARCH_GLOBAL:
mDefaultKeySsb = new SpannableStringBuilder();
Selection.setSelection(mDefaultKeySsb,0);
break;
default:
throw new IllegalArgumentException();
}
}
/**
* Called when a key was pressed down and not handled by any of the views
* inside of the activity. So, for example, key presses while the cursor
* is inside a TextView will not trigger the event (unless it is a navigation
* to another object) because TextView handles its own key presses.
*
* If the focused view didn't want this event, this method is called.
*
* The default implementation takes care of {@link KeyEvent#KEYCODE_BACK}
* by calling {@link #onBackPressed()}, though the behavior varies based
* on the application compatibility mode: for
* {@link android.os.Build.VERSION_CODES#ECLAIR} or later applications,
* it will set up the dispatch to call {@link #onKeyUp} where the action
* will be performed; for earlier applications, it will perform the
* action immediately in on-down, as those versions of the platform
* behaved.
*
* Other additional default key handling may be performed
* if configured with {@link #setDefaultKeyMode}.
*
* @return Return The default implementation handles KEYCODE_BACK to stop the activity
* and go back.
*
* @return Return All calls to your activity's {@link #onUserLeaveHint} callback will
* be accompanied by calls to {@link #onUserInteraction}. This
* ensures that your activity will be told of relevant user activity such
* as pulling down the notification pane and touching an item there.
*
* Note that this callback will be invoked for the touch down action
* that begins a touch gesture, but may not be invoked for the touch-moved
* and touch-up actions that follow.
*
* @see #onUserLeaveHint()
*/
public void onUserInteraction() {
}
public void onWindowAttributesChanged(WindowManager.LayoutParams params) {
// Update window manager if: we have a view, that view is
// attached to its parent (which will be a RootView), and
// this activity is not embedded.
if (mParent == null) {
View decor = mDecor;
if (decor != null && decor.getParent() != null) {
getWindowManager().updateViewLayout(decor, params);
}
}
}
public void onContentChanged() {
}
/**
* Called when the current {@link Window} of the activity gains or loses
* focus. This is the best indicator of whether this activity is visible
* to the user. The default implementation clears the key tracking
* state, so should always be called.
*
* Note that this provides information about global focus state, which
* is managed independently of activity lifecycles. As such, while focus
* changes will generally have some relation to lifecycle changes (an
* activity that is stopped will not generally get window focus), you
* should not rely on any particular order between the callbacks here and
* those in the other lifecycle methods such as {@link #onResume}.
*
* As a general rule, however, a resumed activity will have window
* focus... unless it has displayed other dialogs or popups that take
* input focus, in which case the activity itself will not have focus
* when the other windows have it. Likewise, the system may display
* system-level windows (such as the status bar notification panel or
* a system alert) which will temporarily take window input focus without
* pausing the foreground activity.
*
* @param hasFocus Whether the window of this activity has focus.
*
* @see #hasWindowFocus()
* @see #onResume
* @see View#onWindowFocusChanged(boolean)
*/
public void onWindowFocusChanged(boolean hasFocus) {
}
/**
* Called when the main window associated with the activity has been
* attached to the window manager.
* See {@link View#onAttachedToWindow() View.onAttachedToWindow()}
* for more information.
* @see View#onAttachedToWindow
*/
public void onAttachedToWindow() {
}
/**
* Called when the main window associated with the activity has been
* detached from the window manager.
* See {@link View#onDetachedFromWindow() View.onDetachedFromWindow()}
* for more information.
* @see View#onDetachedFromWindow
*/
public void onDetachedFromWindow() {
}
/**
* Returns true if this activity's main window currently has window focus.
* Note that this is not the same as the view itself having focus.
*
* @return True if this activity's main window currently has window focus.
*
* @see #onWindowAttributesChanged(android.view.WindowManager.LayoutParams)
*/
public boolean hasWindowFocus() {
Window w = getWindow();
if (w != null) {
View d = w.getDecorView();
if (d != null) {
return d.hasWindowFocus();
}
}
return false;
}
/**
* Called to process key events. You can override this to intercept all
* key events before they are dispatched to the window. Be sure to call
* this implementation for key events that should be handled normally.
*
* @param event The key event.
*
* @return boolean Return true if this event was consumed.
*/
public boolean dispatchKeyEvent(KeyEvent event) {
onUserInteraction();
Window win = getWindow();
if (win.superDispatchKeyEvent(event)) {
return true;
}
View decor = mDecor;
if (decor == null) decor = win.getDecorView();
return event.dispatch(this, decor != null
? decor.getKeyDispatcherState() : null, this);
}
/**
* Called to process touch screen events. You can override this to
* intercept all touch screen events before they are dispatched to the
* window. Be sure to call this implementation for touch screen events
* that should be handled normally.
*
* @param ev The touch screen event.
*
* @return boolean Return true if this event was consumed.
*/
public boolean dispatchTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
onUserInteraction();
}
if (getWindow().superDispatchTouchEvent(ev)) {
return true;
}
return onTouchEvent(ev);
}
/**
* Called to process trackball events. You can override this to
* intercept all trackball events before they are dispatched to the
* window. Be sure to call this implementation for trackball events
* that should be handled normally.
*
* @param ev The trackball event.
*
* @return boolean Return true if this event was consumed.
*/
public boolean dispatchTrackballEvent(MotionEvent ev) {
onUserInteraction();
if (getWindow().superDispatchTrackballEvent(ev)) {
return true;
}
return onTrackballEvent(ev);
}
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
event.setClassName(getClass().getName());
event.setPackageName(getPackageName());
LayoutParams params = getWindow().getAttributes();
boolean isFullScreen = (params.width == LayoutParams.MATCH_PARENT) &&
(params.height == LayoutParams.MATCH_PARENT);
event.setFullScreen(isFullScreen);
CharSequence title = getTitle();
if (!TextUtils.isEmpty(title)) {
event.getText().add(title);
}
return true;
}
/**
* Default implementation of
* {@link android.view.Window.Callback#onCreatePanelView}
* for activities. This
* simply returns null so that all panel sub-windows will have the default
* menu behavior.
*/
public View onCreatePanelView(int featureId) {
return null;
}
/**
* Default implementation of
* {@link android.view.Window.Callback#onCreatePanelMenu}
* for activities. This calls through to the new
* {@link #onCreateOptionsMenu} method for the
* {@link android.view.Window#FEATURE_OPTIONS_PANEL} panel,
* so that subclasses of Activity don't need to deal with feature codes.
*/
public boolean onCreatePanelMenu(int featureId, Menu menu) {
if (featureId == Window.FEATURE_OPTIONS_PANEL) {
return onCreateOptionsMenu(menu);
}
return false;
}
/**
* Default implementation of
* {@link android.view.Window.Callback#onPreparePanel}
* for activities. This
* calls through to the new {@link #onPrepareOptionsMenu} method for the
* {@link android.view.Window#FEATURE_OPTIONS_PANEL}
* panel, so that subclasses of
* Activity don't need to deal with feature codes.
*/
public boolean onPreparePanel(int featureId, View view, Menu menu) {
if (featureId == Window.FEATURE_OPTIONS_PANEL && menu != null) {
boolean goforit = onPrepareOptionsMenu(menu);
return goforit && menu.hasVisibleItems();
}
return true;
}
/**
* {@inheritDoc}
*
* @return The default implementation returns true.
*/
public boolean onMenuOpened(int featureId, Menu menu) {
return true;
}
/**
* Default implementation of
* {@link android.view.Window.Callback#onMenuItemSelected}
* for activities. This calls through to the new
* {@link #onOptionsItemSelected} method for the
* {@link android.view.Window#FEATURE_OPTIONS_PANEL}
* panel, so that subclasses of
* Activity don't need to deal with feature codes.
*/
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch (featureId) {
case Window.FEATURE_OPTIONS_PANEL:
// Put event logging here so it gets called even if subclass
// doesn't call through to superclass's implmeentation of each
// of these methods below
EventLog.writeEvent(50000, 0, item.getTitleCondensed());
return onOptionsItemSelected(item);
case Window.FEATURE_CONTEXT_MENU:
EventLog.writeEvent(50000, 1, item.getTitleCondensed());
return onContextItemSelected(item);
default:
return false;
}
}
/**
* Default implementation of
* {@link android.view.Window.Callback#onPanelClosed(int, Menu)} for
* activities. This calls through to {@link #onOptionsMenuClosed(Menu)}
* method for the {@link android.view.Window#FEATURE_OPTIONS_PANEL} panel,
* so that subclasses of Activity don't need to deal with feature codes.
* For context menus ({@link Window#FEATURE_CONTEXT_MENU}), the
* {@link #onContextMenuClosed(Menu)} will be called.
*/
public void onPanelClosed(int featureId, Menu menu) {
switch (featureId) {
case Window.FEATURE_OPTIONS_PANEL:
onOptionsMenuClosed(menu);
break;
case Window.FEATURE_CONTEXT_MENU:
onContextMenuClosed(menu);
break;
}
}
/**
* Initialize the contents of the Activity's standard options menu. You
* should place your menu items in to menu.
*
* This is only called once, the first time the options menu is
* displayed. To update the menu every time it is displayed, see
* {@link #onPrepareOptionsMenu}.
*
* The default implementation populates the menu with standard system
* menu items. These are placed in the {@link Menu#CATEGORY_SYSTEM} group so that
* they will be correctly ordered with application-defined menu items.
* Deriving classes should always call through to the base implementation.
*
* You can safely hold on to menu (and any items created
* from it), making modifications to it as desired, until the next
* time onCreateOptionsMenu() is called.
*
* When you add items to the menu, you can implement the Activity's
* {@link #onOptionsItemSelected} method to handle them there.
*
* @param menu The options menu in which you place your items.
*
* @return You must return true for the menu to be displayed;
* if you return false it will not be shown.
*
* @see #onPrepareOptionsMenu
* @see #onOptionsItemSelected
*/
public boolean onCreateOptionsMenu(Menu menu) {
if (mParent != null) {
return mParent.onCreateOptionsMenu(menu);
}
return true;
}
/**
* Prepare the Screen's standard options menu to be displayed. This is
* called right before the menu is shown, every time it is shown. You can
* use this method to efficiently enable/disable items or otherwise
* dynamically modify the contents.
*
* The default implementation updates the system menu items based on the
* activity's state. Deriving classes should always call through to the
* base class implementation.
*
* @param menu The options menu as last shown or first initialized by
* onCreateOptionsMenu().
*
* @return You must return true for the menu to be displayed;
* if you return false it will not be shown.
*
* @see #onCreateOptionsMenu
*/
public boolean onPrepareOptionsMenu(Menu menu) {
if (mParent != null) {
return mParent.onPrepareOptionsMenu(menu);
}
return true;
}
/**
* This hook is called whenever an item in your options menu is selected.
* The default implementation simply returns false to have the normal
* processing happen (calling the item's Runnable or sending a message to
* its Handler as appropriate). You can use this method for any items
* for which you would like to do processing without those other
* facilities.
*
* Derived classes should call through to the base class for it to
* perform the default menu handling.
*
* @param item The menu item that was selected.
*
* @return boolean Return false to allow normal menu processing to
* proceed, true to consume it here.
*
* @see #onCreateOptionsMenu
*/
public boolean onOptionsItemSelected(MenuItem item) {
if (mParent != null) {
return mParent.onOptionsItemSelected(item);
}
return false;
}
/**
* This hook is called whenever the options menu is being closed (either by the user canceling
* the menu with the back/menu button, or when an item is selected).
*
* @param menu The options menu as last shown or first initialized by
* onCreateOptionsMenu().
*/
public void onOptionsMenuClosed(Menu menu) {
if (mParent != null) {
mParent.onOptionsMenuClosed(menu);
}
}
/**
* Programmatically opens the options menu. If the options menu is already
* open, this method does nothing.
*/
public void openOptionsMenu() {
mWindow.openPanel(Window.FEATURE_OPTIONS_PANEL, null);
}
/**
* Progammatically closes the options menu. If the options menu is already
* closed, this method does nothing.
*/
public void closeOptionsMenu() {
mWindow.closePanel(Window.FEATURE_OPTIONS_PANEL);
}
/**
* Called when a context menu for the {@code view} is about to be shown.
* Unlike {@link #onCreateOptionsMenu(Menu)}, this will be called every
* time the context menu is about to be shown and should be populated for
* the view (or item inside the view for {@link AdapterView} subclasses,
* this can be found in the {@code menuInfo})).
*
* Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an
* item has been selected.
*
* It is not safe to hold onto the context menu after this method returns.
* {@inheritDoc}
*/
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
}
/**
* Registers a context menu to be shown for the given view (multiple views
* can show the context menu). This method will set the
* {@link OnCreateContextMenuListener} on the view to this activity, so
* {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be
* called when it is time to show the context menu.
*
* @see #unregisterForContextMenu(View)
* @param view The view that should show a context menu.
*/
public void registerForContextMenu(View view) {
view.setOnCreateContextMenuListener(this);
}
/**
* Prevents a context menu to be shown for the given view. This method will remove the
* {@link OnCreateContextMenuListener} on the view.
*
* @see #registerForContextMenu(View)
* @param view The view that should stop showing a context menu.
*/
public void unregisterForContextMenu(View view) {
view.setOnCreateContextMenuListener(null);
}
/**
* Programmatically opens the context menu for a particular {@code view}.
* The {@code view} should have been added via
* {@link #registerForContextMenu(View)}.
*
* @param view The view to show the context menu for.
*/
public void openContextMenu(View view) {
view.showContextMenu();
}
/**
* Programmatically closes the most recently opened context menu, if showing.
*/
public void closeContextMenu() {
mWindow.closePanel(Window.FEATURE_CONTEXT_MENU);
}
/**
* This hook is called whenever an item in a context menu is selected. The
* default implementation simply returns false to have the normal processing
* happen (calling the item's Runnable or sending a message to its Handler
* as appropriate). You can use this method for any items for which you
* would like to do processing without those other facilities.
*
* Use {@link MenuItem#getMenuInfo()} to get extra information set by the
* View that added this menu item.
*
* Derived classes should call through to the base class for it to perform
* the default menu handling.
*
* @param item The context menu item that was selected.
* @return boolean Return false to allow normal context menu processing to
* proceed, true to consume it here.
*/
public boolean onContextItemSelected(MenuItem item) {
if (mParent != null) {
return mParent.onContextItemSelected(item);
}
return false;
}
/**
* This hook is called whenever the context menu is being closed (either by
* the user canceling the menu with the back/menu button, or when an item is
* selected).
*
* @param menu The context menu that is being closed.
*/
public void onContextMenuClosed(Menu menu) {
if (mParent != null) {
mParent.onContextMenuClosed(menu);
}
}
/**
* @deprecated Old no-arguments version of {@link #onCreateDialog(int, Bundle)}.
*/
@Deprecated
protected Dialog onCreateDialog(int id) {
return null;
}
/**
* Callback for creating dialogs that are managed (saved and restored) for you
* by the activity. The default implementation calls through to
* {@link #onCreateDialog(int)} for compatibility.
*
* If you use {@link #showDialog(int)}, the activity will call through to
* this method the first time, and hang onto it thereafter. Any dialog
* that is created by this method will automatically be saved and restored
* for you, including whether it is showing.
*
* If you would like the activity to manage saving and restoring dialogs
* for you, you should override this method and handle any ids that are
* passed to {@link #showDialog}.
*
* If you would like an opportunity to prepare your dialog before it is shown,
* override {@link #onPrepareDialog(int, Dialog, Bundle)}.
*
* @param id The id of the dialog.
* @param args The dialog arguments provided to {@link #showDialog(int, Bundle)}.
* @return The dialog. If you return null, the dialog will not be created.
*
* @see #onPrepareDialog(int, Dialog, Bundle)
* @see #showDialog(int, Bundle)
* @see #dismissDialog(int)
* @see #removeDialog(int)
*/
protected Dialog onCreateDialog(int id, Bundle args) {
return onCreateDialog(id);
}
/**
* @deprecated Old no-arguments version of
* {@link #onPrepareDialog(int, Dialog, Bundle)}.
*/
@Deprecated
protected void onPrepareDialog(int id, Dialog dialog) {
dialog.setOwnerActivity(this);
}
/**
* Provides an opportunity to prepare a managed dialog before it is being
* shown. The default implementation calls through to
* {@link #onPrepareDialog(int, Dialog)} for compatibility.
*
*
* Override this if you need to update a managed dialog based on the state
* of the application each time it is shown. For example, a time picker
* dialog might want to be updated with the current time. You should call
* through to the superclass's implementation. The default implementation
* will set this Activity as the owner activity on the Dialog.
*
* @param id The id of the managed dialog.
* @param dialog The dialog.
* @param args The dialog arguments provided to {@link #showDialog(int, Bundle)}.
* @see #onCreateDialog(int, Bundle)
* @see #showDialog(int)
* @see #dismissDialog(int)
* @see #removeDialog(int)
*/
protected void onPrepareDialog(int id, Dialog dialog, Bundle args) {
onPrepareDialog(id, dialog);
}
/**
* Simple version of {@link #showDialog(int, Bundle)} that does not
* take any arguments. Simply calls {@link #showDialog(int, Bundle)}
* with null arguments.
*/
public final void showDialog(int id) {
showDialog(id, null);
}
/**
* Show a dialog managed by this activity. A call to {@link #onCreateDialog(int, Bundle)}
* will be made with the same id the first time this is called for a given
* id. From thereafter, the dialog will be automatically saved and restored.
*
* Each time a dialog is shown, {@link #onPrepareDialog(int, Dialog, Bundle)} will
* be made to provide an opportunity to do any timely preparation.
*
* @param id The id of the managed dialog.
* @param args Arguments to pass through to the dialog. These will be saved
* and restored for you. Note that if the dialog is already created,
* {@link #onCreateDialog(int, Bundle)} will not be called with the new
* arguments but {@link #onPrepareDialog(int, Dialog, Bundle)} will be.
* If you need to rebuild the dialog, call {@link #removeDialog(int)} first.
* @return Returns true if the Dialog was created; false is returned if
* it is not created because {@link #onCreateDialog(int, Bundle)} returns false.
*
* @see Dialog
* @see #onCreateDialog(int, Bundle)
* @see #onPrepareDialog(int, Dialog, Bundle)
* @see #dismissDialog(int)
* @see #removeDialog(int)
*/
public final boolean showDialog(int id, Bundle args) {
if (mManagedDialogs == null) {
mManagedDialogs = new SparseArray This can be useful if you know that you will never show a dialog again and
* want to avoid the overhead of saving and restoring it in the future.
*
* As of {@link android.os.Build.VERSION_CODES#GINGERBREAD}, this function
* will not throw an exception if you try to remove an ID that does not
* currently have an associated dialog. You can use this function as a simple way to launch the search UI, in response to a
* menu item, search button, or other widgets within your activity. Unless overidden,
* calling this function is the same as calling
* {@link #startSearch startSearch(null, false, null, false)}, which launches
* search for the current activity as specified in its manifest, see {@link SearchManager}.
*
* You can override this function to force global search, e.g. in response to a dedicated
* search key, or to block search entirely (by simply returning false).
*
* @return Returns {@code true} if search launched, and {@code false} if activity blocks it.
* The default implementation always returns {@code true}.
*
* @see android.app.SearchManager
*/
public boolean onSearchRequested() {
startSearch(null, false, null, false);
return true;
}
/**
* This hook is called to launch the search UI.
*
* It is typically called from onSearchRequested(), either directly from
* Activity.onSearchRequested() or from an overridden version in any given
* Activity. If your goal is simply to activate search, it is preferred to call
* onSearchRequested(), which may have been overriden elsewhere in your Activity. If your goal
* is to inject specific data such as context data, it is preferred to override
* onSearchRequested(), so that any callers to it will benefit from the override.
*
* @param initialQuery Any non-null non-empty string will be inserted as
* pre-entered text in the search query box.
* @param selectInitialQuery If true, the intial query will be preselected, which means that
* any further typing will replace it. This is useful for cases where an entire pre-formed
* query is being inserted. If false, the selection point will be placed at the end of the
* inserted query. This is useful when the inserted query is text that the user entered,
* and the user would expect to be able to keep typing. This parameter is only meaningful
* if initialQuery is a non-empty string.
* @param appSearchData An application can insert application-specific
* context here, in order to improve quality or specificity of its own
* searches. This data will be returned with SEARCH intent(s). Null if
* no extra data is required.
* @param globalSearch If false, this will only launch the search that has been specifically
* defined by the application (which is usually defined as a local search). If no default
* search is defined in the current application or activity, global search will be launched.
* If true, this will always launch a platform-global (e.g. web-based) search instead.
*
* @see android.app.SearchManager
* @see #onSearchRequested
*/
public void startSearch(String initialQuery, boolean selectInitialQuery,
Bundle appSearchData, boolean globalSearch) {
ensureSearchManager();
mSearchManager.startSearch(initialQuery, selectInitialQuery, getComponentName(),
appSearchData, globalSearch);
}
/**
* Similar to {@link #startSearch}, but actually fires off the search query after invoking
* the search dialog. Made available for testing purposes.
*
* @param query The query to trigger. If empty, the request will be ignored.
* @param appSearchData An application can insert application-specific
* context here, in order to improve quality or specificity of its own
* searches. This data will be returned with SEARCH intent(s). Null if
* no extra data is required.
*/
public void triggerSearch(String query, Bundle appSearchData) {
ensureSearchManager();
mSearchManager.triggerSearch(query, getComponentName(), appSearchData);
}
/**
* Request that key events come to this activity. Use this if your
* activity has no views with focus, but the activity still wants
* a chance to process key events.
*
* @see android.view.Window#takeKeyEvents
*/
public void takeKeyEvents(boolean get) {
getWindow().takeKeyEvents(get);
}
/**
* Enable extended window features. This is a convenience for calling
* {@link android.view.Window#requestFeature getWindow().requestFeature()}.
*
* @param featureId The desired feature as defined in
* {@link android.view.Window}.
* @return Returns true if the requested feature is supported and now
* enabled.
*
* @see android.view.Window#requestFeature
*/
public final boolean requestWindowFeature(int featureId) {
return getWindow().requestFeature(featureId);
}
/**
* Convenience for calling
* {@link android.view.Window#setFeatureDrawableResource}.
*/
public final void setFeatureDrawableResource(int featureId, int resId) {
getWindow().setFeatureDrawableResource(featureId, resId);
}
/**
* Convenience for calling
* {@link android.view.Window#setFeatureDrawableUri}.
*/
public final void setFeatureDrawableUri(int featureId, Uri uri) {
getWindow().setFeatureDrawableUri(featureId, uri);
}
/**
* Convenience for calling
* {@link android.view.Window#setFeatureDrawable(int, Drawable)}.
*/
public final void setFeatureDrawable(int featureId, Drawable drawable) {
getWindow().setFeatureDrawable(featureId, drawable);
}
/**
* Convenience for calling
* {@link android.view.Window#setFeatureDrawableAlpha}.
*/
public final void setFeatureDrawableAlpha(int featureId, int alpha) {
getWindow().setFeatureDrawableAlpha(featureId, alpha);
}
/**
* Convenience for calling
* {@link android.view.Window#getLayoutInflater}.
*/
public LayoutInflater getLayoutInflater() {
return getWindow().getLayoutInflater();
}
/**
* Returns a {@link MenuInflater} with this context.
*/
public MenuInflater getMenuInflater() {
return new MenuInflater(this);
}
@Override
protected void onApplyThemeResource(Resources.Theme theme, int resid,
boolean first) {
if (mParent == null) {
super.onApplyThemeResource(theme, resid, first);
} else {
try {
theme.setTo(mParent.getTheme());
} catch (Exception e) {
// Empty
}
theme.applyStyle(resid, false);
}
}
/**
* Launch an activity for which you would like a result when it finished.
* When this activity exits, your
* onActivityResult() method will be called with the given requestCode.
* Using a negative requestCode is the same as calling
* {@link #startActivity} (the activity is not launched as a sub-activity).
*
* Note that this method should only be used with Intent protocols
* that are defined to return a result. In other protocols (such as
* {@link Intent#ACTION_MAIN} or {@link Intent#ACTION_VIEW}), you may
* not get the result when you expect. For example, if the activity you
* are launching uses the singleTask launch mode, it will not run in your
* task and thus you will immediately receive a cancel result.
*
* As a special case, if you call startActivityForResult() with a requestCode
* >= 0 during the initial onCreate(Bundle savedInstanceState)/onResume() of your
* activity, then your window will not be displayed until a result is
* returned back from the started activity. This is to avoid visible
* flickering when redirecting to another activity.
*
* This method throws {@link android.content.ActivityNotFoundException}
* if there was no Activity found to run the given Intent.
*
* @param intent The intent to start.
* @param requestCode If >= 0, this code will be returned in
* onActivityResult() when the activity exits.
*
* @throws android.content.ActivityNotFoundException
*
* @see #startActivity
*/
public void startActivityForResult(Intent intent, int requestCode) {
if (mParent == null) {
Instrumentation.ActivityResult ar =
mInstrumentation.execStartActivity(
this, mMainThread.getApplicationThread(), mToken, this,
intent, requestCode);
if (ar != null) {
mMainThread.sendActivityResult(
mToken, mEmbeddedID, requestCode, ar.getResultCode(),
ar.getResultData());
}
if (requestCode >= 0) {
// If this start is requesting a result, we can avoid making
// the activity visible until the result is received. Setting
// this code during onCreate(Bundle savedInstanceState) or onResume() will keep the
// activity hidden during this time, to avoid flickering.
// This can only be done when a result is requested because
// that guarantees we will get information back when the
// activity is finished, no matter what happens to it.
mStartedActivity = true;
}
} else {
mParent.startActivityFromChild(this, intent, requestCode);
}
}
/**
* Like {@link #startActivityForResult(Intent, int)}, but allowing you
* to use a IntentSender to describe the activity to be started. If
* the IntentSender is for an activity, that activity will be started
* as if you had called the regular {@link #startActivityForResult(Intent, int)}
* here; otherwise, its associated action will be executed (such as
* sending a broadcast) as if you had called
* {@link IntentSender#sendIntent IntentSender.sendIntent} on it.
*
* @param intent The IntentSender to launch.
* @param requestCode If >= 0, this code will be returned in
* onActivityResult() when the activity exits.
* @param fillInIntent If non-null, this will be provided as the
* intent parameter to {@link IntentSender#sendIntent}.
* @param flagsMask Intent flags in the original IntentSender that you
* would like to change.
* @param flagsValues Desired values for any bits set in
* flagsMask
* @param extraFlags Always set to 0.
*/
public void startIntentSenderForResult(IntentSender intent, int requestCode,
Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)
throws IntentSender.SendIntentException {
if (mParent == null) {
startIntentSenderForResultInner(intent, requestCode, fillInIntent,
flagsMask, flagsValues, this);
} else {
mParent.startIntentSenderFromChild(this, intent, requestCode,
fillInIntent, flagsMask, flagsValues, extraFlags);
}
}
private void startIntentSenderForResultInner(IntentSender intent, int requestCode,
Intent fillInIntent, int flagsMask, int flagsValues, Activity activity)
throws IntentSender.SendIntentException {
try {
String resolvedType = null;
if (fillInIntent != null) {
resolvedType = fillInIntent.resolveTypeIfNeeded(getContentResolver());
}
int result = ActivityManagerNative.getDefault()
.startActivityIntentSender(mMainThread.getApplicationThread(), intent,
fillInIntent, resolvedType, mToken, activity.mEmbeddedID,
requestCode, flagsMask, flagsValues);
if (result == IActivityManager.START_CANCELED) {
throw new IntentSender.SendIntentException();
}
Instrumentation.checkStartActivityResult(result, null);
} catch (RemoteException e) {
}
if (requestCode >= 0) {
// If this start is requesting a result, we can avoid making
// the activity visible until the result is received. Setting
// this code during onCreate(Bundle savedInstanceState) or onResume() will keep the
// activity hidden during this time, to avoid flickering.
// This can only be done when a result is requested because
// that guarantees we will get information back when the
// activity is finished, no matter what happens to it.
mStartedActivity = true;
}
}
/**
* Launch a new activity. You will not receive any information about when
* the activity exits. This implementation overrides the base version,
* providing information about
* the activity performing the launch. Because of this additional
* information, the {@link Intent#FLAG_ACTIVITY_NEW_TASK} launch flag is not
* required; if not specified, the new activity will be added to the
* task of the caller.
*
* This method throws {@link android.content.ActivityNotFoundException}
* if there was no Activity found to run the given Intent.
*
* @param intent The intent to start.
*
* @throws android.content.ActivityNotFoundException
*
* @see #startActivityForResult
*/
@Override
public void startActivity(Intent intent) {
startActivityForResult(intent, -1);
}
/**
* Like {@link #startActivity(Intent)}, but taking a IntentSender
* to start; see
* {@link #startIntentSenderForResult(IntentSender, int, Intent, int, int, int)}
* for more information.
*
* @param intent The IntentSender to launch.
* @param fillInIntent If non-null, this will be provided as the
* intent parameter to {@link IntentSender#sendIntent}.
* @param flagsMask Intent flags in the original IntentSender that you
* would like to change.
* @param flagsValues Desired values for any bits set in
* flagsMask
* @param extraFlags Always set to 0.
*/
public void startIntentSender(IntentSender intent,
Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)
throws IntentSender.SendIntentException {
startIntentSenderForResult(intent, -1, fillInIntent, flagsMask,
flagsValues, extraFlags);
}
/**
* A special variation to launch an activity only if a new activity
* instance is needed to handle the given Intent. In other words, this is
* just like {@link #startActivityForResult(Intent, int)} except: if you are
* using the {@link Intent#FLAG_ACTIVITY_SINGLE_TOP} flag, or
* singleTask or singleTop
* {@link android.R.styleable#AndroidManifestActivity_launchMode launchMode},
* and the activity
* that handles intent is the same as your currently running
* activity, then a new instance is not needed. In this case, instead of
* the normal behavior of calling {@link #onNewIntent} this function will
* return and you can handle the Intent yourself.
*
* This function can only be called from a top-level activity; if it is
* called from a child activity, a runtime exception will be thrown.
*
* @param intent The intent to start.
* @param requestCode If >= 0, this code will be returned in
* onActivityResult() when the activity exits, as described in
* {@link #startActivityForResult}.
*
* @return If a new activity was launched then true is returned; otherwise
* false is returned and you must handle the Intent yourself.
*
* @see #startActivity
* @see #startActivityForResult
*/
public boolean startActivityIfNeeded(Intent intent, int requestCode) {
if (mParent == null) {
int result = IActivityManager.START_RETURN_INTENT_TO_CALLER;
try {
result = ActivityManagerNative.getDefault()
.startActivity(mMainThread.getApplicationThread(),
intent, intent.resolveTypeIfNeeded(
getContentResolver()),
null, 0,
mToken, mEmbeddedID, requestCode, true, false);
} catch (RemoteException e) {
// Empty
}
Instrumentation.checkStartActivityResult(result, intent);
if (requestCode >= 0) {
// If this start is requesting a result, we can avoid making
// the activity visible until the result is received. Setting
// this code during onCreate(Bundle savedInstanceState) or onResume() will keep the
// activity hidden during this time, to avoid flickering.
// This can only be done when a result is requested because
// that guarantees we will get information back when the
// activity is finished, no matter what happens to it.
mStartedActivity = true;
}
return result != IActivityManager.START_RETURN_INTENT_TO_CALLER;
}
throw new UnsupportedOperationException(
"startActivityIfNeeded can only be called from a top-level activity");
}
/**
* Special version of starting an activity, for use when you are replacing
* other activity components. You can use this to hand the Intent off
* to the next Activity that can handle it. You typically call this in
* {@link #onCreate} with the Intent returned by {@link #getIntent}.
*
* @param intent The intent to dispatch to the next activity. For
* correct behavior, this must be the same as the Intent that started
* your own activity; the only changes you can make are to the extras
* inside of it.
*
* @return Returns a boolean indicating whether there was another Activity
* to start: true if there was a next activity to start, false if there
* wasn't. In general, if true is returned you will then want to call
* finish() on yourself.
*/
public boolean startNextMatchingActivity(Intent intent) {
if (mParent == null) {
try {
return ActivityManagerNative.getDefault()
.startNextMatchingActivity(mToken, intent);
} catch (RemoteException e) {
// Empty
}
return false;
}
throw new UnsupportedOperationException(
"startNextMatchingActivity can only be called from a top-level activity");
}
/**
* This is called when a child activity of this one calls its
* {@link #startActivity} or {@link #startActivityForResult} method.
*
* This method throws {@link android.content.ActivityNotFoundException}
* if there was no Activity found to run the given Intent.
*
* @param child The activity making the call.
* @param intent The intent to start.
* @param requestCode Reply request code. < 0 if reply is not requested.
*
* @throws android.content.ActivityNotFoundException
*
* @see #startActivity
* @see #startActivityForResult
*/
public void startActivityFromChild(Activity child, Intent intent,
int requestCode) {
Instrumentation.ActivityResult ar =
mInstrumentation.execStartActivity(
this, mMainThread.getApplicationThread(), mToken, child,
intent, requestCode);
if (ar != null) {
mMainThread.sendActivityResult(
mToken, child.mEmbeddedID, requestCode,
ar.getResultCode(), ar.getResultData());
}
}
/**
* Like {@link #startActivityFromChild(Activity, Intent, int)}, but
* taking a IntentSender; see
* {@link #startIntentSenderForResult(IntentSender, int, Intent, int, int, int)}
* for more information.
*/
public void startIntentSenderFromChild(Activity child, IntentSender intent,
int requestCode, Intent fillInIntent, int flagsMask, int flagsValues,
int extraFlags)
throws IntentSender.SendIntentException {
startIntentSenderForResultInner(intent, requestCode, fillInIntent,
flagsMask, flagsValues, child);
}
/**
* Call immediately after one of the flavors of {@link #startActivity(Intent)}
* or {@link #finish} to specify an explicit transition animation to
* perform next.
* @param enterAnim A resource ID of the animation resource to use for
* the incoming activity. Use 0 for no animation.
* @param exitAnim A resource ID of the animation resource to use for
* the outgoing activity. Use 0 for no animation.
*/
public void overridePendingTransition(int enterAnim, int exitAnim) {
try {
ActivityManagerNative.getDefault().overridePendingTransition(
mToken, getPackageName(), enterAnim, exitAnim);
} catch (RemoteException e) {
}
}
/**
* Call this to set the result that your activity will return to its
* caller.
*
* @param resultCode The result code to propagate back to the originating
* activity, often RESULT_CANCELED or RESULT_OK
*
* @see #RESULT_CANCELED
* @see #RESULT_OK
* @see #RESULT_FIRST_USER
* @see #setResult(int, Intent)
*/
public final void setResult(int resultCode) {
synchronized (this) {
mResultCode = resultCode;
mResultData = null;
}
}
/**
* Call this to set the result that your activity will return to its
* caller.
*
* @param resultCode The result code to propagate back to the originating
* activity, often RESULT_CANCELED or RESULT_OK
* @param data The data to propagate back to the originating activity.
*
* @see #RESULT_CANCELED
* @see #RESULT_OK
* @see #RESULT_FIRST_USER
* @see #setResult(int)
*/
public final void setResult(int resultCode, Intent data) {
synchronized (this) {
mResultCode = resultCode;
mResultData = data;
}
}
/**
* Return the name of the package that invoked this activity. This is who
* the data in {@link #setResult setResult()} will be sent to. You can
* use this information to validate that the recipient is allowed to
* receive the data.
*
* Note: if the calling activity is not expecting a result (that is it
* did not use the {@link #startActivityForResult}
* form that includes a request code), then the calling package will be
* null.
*
* @return The package of the activity that will receive your
* reply, or null if none.
*/
public String getCallingPackage() {
try {
return ActivityManagerNative.getDefault().getCallingPackage(mToken);
} catch (RemoteException e) {
return null;
}
}
/**
* Return the name of the activity that invoked this activity. This is
* who the data in {@link #setResult setResult()} will be sent to. You
* can use this information to validate that the recipient is allowed to
* receive the data.
*
* Note: if the calling activity is not expecting a result (that is it
* did not use the {@link #startActivityForResult}
* form that includes a request code), then the calling package will be
* null.
*
* @return String The full name of the activity that will receive your
* reply, or null if none.
*/
public ComponentName getCallingActivity() {
try {
return ActivityManagerNative.getDefault().getCallingActivity(mToken);
} catch (RemoteException e) {
return null;
}
}
/**
* Control whether this activity's main window is visible. This is intended
* only for the special case of an activity that is not going to show a
* UI itself, but can't just finish prior to onResume() because it needs
* to wait for a service binding or such. Setting this to false allows
* you to prevent your UI from being shown during that time.
*
* The default value for this is taken from the
* {@link android.R.attr#windowNoDisplay} attribute of the activity's theme.
*/
public void setVisible(boolean visible) {
if (mVisibleFromClient != visible) {
mVisibleFromClient = visible;
if (mVisibleFromServer) {
if (visible) makeVisible();
else mDecor.setVisibility(View.INVISIBLE);
}
}
}
void makeVisible() {
if (!mWindowAdded) {
ViewManager wm = getWindowManager();
wm.addView(mDecor, getWindow().getAttributes());
mWindowAdded = true;
}
mDecor.setVisibility(View.VISIBLE);
}
/**
* Check to see whether this activity is in the process of finishing,
* either because you called {@link #finish} on it or someone else
* has requested that it finished. This is often used in
* {@link #onPause} to determine whether the activity is simply pausing or
* completely finishing.
*
* @return If the activity is finishing, returns true; else returns false.
*
* @see #finish
*/
public boolean isFinishing() {
return mFinished;
}
/**
* Call this when your activity is done and should be closed. The
* ActivityResult is propagated back to whoever launched you via
* onActivityResult().
*/
public void finish() {
if (mParent == null) {
int resultCode;
Intent resultData;
synchronized (this) {
resultCode = mResultCode;
resultData = mResultData;
}
if (Config.LOGV) Log.v(TAG, "Finishing self: token=" + mToken);
try {
if (ActivityManagerNative.getDefault()
.finishActivity(mToken, resultCode, resultData)) {
mFinished = true;
}
} catch (RemoteException e) {
// Empty
}
} else {
mParent.finishFromChild(this);
}
}
/**
* This is called when a child activity of this one calls its
* {@link #finish} method. The default implementation simply calls
* finish() on this activity (the parent), finishing the entire group.
*
* @param child The activity making the call.
*
* @see #finish
*/
public void finishFromChild(Activity child) {
finish();
}
/**
* Force finish another activity that you had previously started with
* {@link #startActivityForResult}.
*
* @param requestCode The request code of the activity that you had
* given to startActivityForResult(). If there are multiple
* activities started with this request code, they
* will all be finished.
*/
public void finishActivity(int requestCode) {
if (mParent == null) {
try {
ActivityManagerNative.getDefault()
.finishSubActivity(mToken, mEmbeddedID, requestCode);
} catch (RemoteException e) {
// Empty
}
} else {
mParent.finishActivityFromChild(this, requestCode);
}
}
/**
* This is called when a child activity of this one calls its
* finishActivity().
*
* @param child The activity making the call.
* @param requestCode Request code that had been used to start the
* activity.
*/
public void finishActivityFromChild(Activity child, int requestCode) {
try {
ActivityManagerNative.getDefault()
.finishSubActivity(mToken, child.mEmbeddedID, requestCode);
} catch (RemoteException e) {
// Empty
}
}
/**
* Called when an activity you launched exits, giving you the requestCode
* you started it with, the resultCode it returned, and any additional
* data from it. The resultCode will be
* {@link #RESULT_CANCELED} if the activity explicitly returned that,
* didn't return any result, or crashed during its operation.
*
* You will receive this call immediately before onResume() when your
* activity is re-starting.
*
* @param requestCode The integer request code originally supplied to
* startActivityForResult(), allowing you to identify who this
* result came from.
* @param resultCode The integer result code returned by the child activity
* through its setResult().
* @param data An Intent, which can return result data to the caller
* (various data can be attached to Intent "extras").
*
* @see #startActivityForResult
* @see #createPendingResult
* @see #setResult(int)
*/
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
}
/**
* Create a new PendingIntent object which you can hand to others
* for them to use to send result data back to your
* {@link #onActivityResult} callback. The created object will be either
* one-shot (becoming invalid after a result is sent back) or multiple
* (allowing any number of results to be sent through it).
*
* @param requestCode Private request code for the sender that will be
* associated with the result data when it is returned. The sender can not
* modify this value, allowing you to identify incoming results.
* @param data Default data to supply in the result, which may be modified
* by the sender.
* @param flags May be {@link PendingIntent#FLAG_ONE_SHOT PendingIntent.FLAG_ONE_SHOT},
* {@link PendingIntent#FLAG_NO_CREATE PendingIntent.FLAG_NO_CREATE},
* {@link PendingIntent#FLAG_CANCEL_CURRENT PendingIntent.FLAG_CANCEL_CURRENT},
* {@link PendingIntent#FLAG_UPDATE_CURRENT PendingIntent.FLAG_UPDATE_CURRENT},
* or any of the flags as supported by
* {@link Intent#fillIn Intent.fillIn()} to control which unspecified parts
* of the intent that can be supplied when the actual send happens.
*
* @return Returns an existing or new PendingIntent matching the given
* parameters. May return null only if
* {@link PendingIntent#FLAG_NO_CREATE PendingIntent.FLAG_NO_CREATE} has been
* supplied.
*
* @see PendingIntent
*/
public PendingIntent createPendingResult(int requestCode, Intent data,
int flags) {
String packageName = getPackageName();
try {
IIntentSender target =
ActivityManagerNative.getDefault().getIntentSender(
IActivityManager.INTENT_SENDER_ACTIVITY_RESULT, packageName,
mParent == null ? mToken : mParent.mToken,
mEmbeddedID, requestCode, data, null, flags);
return target != null ? new PendingIntent(target) : null;
} catch (RemoteException e) {
// Empty
}
return null;
}
/**
* Change the desired orientation of this activity. If the activity
* is currently in the foreground or otherwise impacting the screen
* orientation, the screen will immediately be changed (possibly causing
* the activity to be restarted). Otherwise, this will be used the next
* time the activity is visible.
*
* @param requestedOrientation An orientation constant as used in
* {@link ActivityInfo#screenOrientation ActivityInfo.screenOrientation}.
*/
public void setRequestedOrientation(int requestedOrientation) {
if (mParent == null) {
try {
ActivityManagerNative.getDefault().setRequestedOrientation(
mToken, requestedOrientation);
} catch (RemoteException e) {
// Empty
}
} else {
mParent.setRequestedOrientation(requestedOrientation);
}
}
/**
* Return the current requested orientation of the activity. This will
* either be the orientation requested in its component's manifest, or
* the last requested orientation given to
* {@link #setRequestedOrientation(int)}.
*
* @return Returns an orientation constant as used in
* {@link ActivityInfo#screenOrientation ActivityInfo.screenOrientation}.
*/
public int getRequestedOrientation() {
if (mParent == null) {
try {
return ActivityManagerNative.getDefault()
.getRequestedOrientation(mToken);
} catch (RemoteException e) {
// Empty
}
} else {
return mParent.getRequestedOrientation();
}
return ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
}
/**
* Return the identifier of the task this activity is in. This identifier
* will remain the same for the lifetime of the activity.
*
* @return Task identifier, an opaque integer.
*/
public int getTaskId() {
try {
return ActivityManagerNative.getDefault()
.getTaskForActivity(mToken, false);
} catch (RemoteException e) {
return -1;
}
}
/**
* Return whether this activity is the root of a task. The root is the
* first activity in a task.
*
* @return True if this is the root activity, else false.
*/
public boolean isTaskRoot() {
try {
return ActivityManagerNative.getDefault()
.getTaskForActivity(mToken, true) >= 0;
} catch (RemoteException e) {
return false;
}
}
/**
* Move the task containing this activity to the back of the activity
* stack. The activity's order within the task is unchanged.
*
* @param nonRoot If false then this only works if the activity is the root
* of a task; if true it will work for any activity in
* a task.
*
* @return If the task was moved (or it was already at the
* back) true is returned, else false.
*/
public boolean moveTaskToBack(boolean nonRoot) {
try {
return ActivityManagerNative.getDefault().moveActivityTaskToBack(
mToken, nonRoot);
} catch (RemoteException e) {
// Empty
}
return false;
}
/**
* Returns class name for this activity with the package prefix removed.
* This is the default name used to read and write settings.
*
* @return The local class name.
*/
public String getLocalClassName() {
final String pkg = getPackageName();
final String cls = mComponent.getClassName();
int packageLen = pkg.length();
if (!cls.startsWith(pkg) || cls.length() <= packageLen
|| cls.charAt(packageLen) != '.') {
return cls;
}
return cls.substring(packageLen+1);
}
/**
* Returns complete component name of this activity.
*
* @return Returns the complete component name for this activity
*/
public ComponentName getComponentName()
{
return mComponent;
}
/**
* Retrieve a {@link SharedPreferences} object for accessing preferences
* that are private to this activity. This simply calls the underlying
* {@link #getSharedPreferences(String, int)} method by passing in this activity's
* class name as the preferences name.
*
* @param mode Operating mode. Use {@link #MODE_PRIVATE} for the default
* operation, {@link #MODE_WORLD_READABLE} and
* {@link #MODE_WORLD_WRITEABLE} to control permissions.
*
* @return Returns the single SharedPreferences instance that can be used
* to retrieve and modify the preference values.
*/
public SharedPreferences getPreferences(int mode) {
return getSharedPreferences(getLocalClassName(), mode);
}
private void ensureSearchManager() {
if (mSearchManager != null) {
return;
}
mSearchManager = new SearchManager(this, null);
}
@Override
public Object getSystemService(String name) {
if (getBaseContext() == null) {
throw new IllegalStateException(
"System services not available to Activities before onCreate()");
}
if (WINDOW_SERVICE.equals(name)) {
return mWindowManager;
} else if (SEARCH_SERVICE.equals(name)) {
ensureSearchManager();
return mSearchManager;
}
return super.getSystemService(name);
}
/**
* Change the title associated with this activity. If this is a
* top-level activity, the title for its window will change. If it
* is an embedded activity, the parent can do whatever it wants
* with it.
*/
public void setTitle(CharSequence title) {
mTitle = title;
onTitleChanged(title, mTitleColor);
if (mParent != null) {
mParent.onChildTitleChanged(this, title);
}
}
/**
* Change the title associated with this activity. If this is a
* top-level activity, the title for its window will change. If it
* is an embedded activity, the parent can do whatever it wants
* with it.
*/
public void setTitle(int titleId) {
setTitle(getText(titleId));
}
public void setTitleColor(int textColor) {
mTitleColor = textColor;
onTitleChanged(mTitle, textColor);
}
public final CharSequence getTitle() {
return mTitle;
}
public final int getTitleColor() {
return mTitleColor;
}
protected void onTitleChanged(CharSequence title, int color) {
if (mTitleReady) {
final Window win = getWindow();
if (win != null) {
win.setTitle(title);
if (color != 0) {
win.setTitleColor(color);
}
}
}
}
protected void onChildTitleChanged(Activity childActivity, CharSequence title) {
}
/**
* Sets the visibility of the progress bar in the title.
*
* In order for the progress bar to be shown, the feature must be requested
* via {@link #requestWindowFeature(int)}.
*
* @param visible Whether to show the progress bars in the title.
*/
public final void setProgressBarVisibility(boolean visible) {
getWindow().setFeatureInt(Window.FEATURE_PROGRESS, visible ? Window.PROGRESS_VISIBILITY_ON :
Window.PROGRESS_VISIBILITY_OFF);
}
/**
* Sets the visibility of the indeterminate progress bar in the title.
*
* In order for the progress bar to be shown, the feature must be requested
* via {@link #requestWindowFeature(int)}.
*
* @param visible Whether to show the progress bars in the title.
*/
public final void setProgressBarIndeterminateVisibility(boolean visible) {
getWindow().setFeatureInt(Window.FEATURE_INDETERMINATE_PROGRESS,
visible ? Window.PROGRESS_VISIBILITY_ON : Window.PROGRESS_VISIBILITY_OFF);
}
/**
* Sets whether the horizontal progress bar in the title should be indeterminate (the circular
* is always indeterminate).
*
* In order for the progress bar to be shown, the feature must be requested
* via {@link #requestWindowFeature(int)}.
*
* @param indeterminate Whether the horizontal progress bar should be indeterminate.
*/
public final void setProgressBarIndeterminate(boolean indeterminate) {
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,
indeterminate ? Window.PROGRESS_INDETERMINATE_ON : Window.PROGRESS_INDETERMINATE_OFF);
}
/**
* Sets the progress for the progress bars in the title.
*
* In order for the progress bar to be shown, the feature must be requested
* via {@link #requestWindowFeature(int)}.
*
* @param progress The progress for the progress bar. Valid ranges are from
* 0 to 10000 (both inclusive). If 10000 is given, the progress
* bar will be completely filled and will fade out.
*/
public final void setProgress(int progress) {
getWindow().setFeatureInt(Window.FEATURE_PROGRESS, progress + Window.PROGRESS_START);
}
/**
* Sets the secondary progress for the progress bar in the title. This
* progress is drawn between the primary progress (set via
* {@link #setProgress(int)} and the background. It can be ideal for media
* scenarios such as showing the buffering progress while the default
* progress shows the play progress.
*
* In order for the progress bar to be shown, the feature must be requested
* via {@link #requestWindowFeature(int)}.
*
* @param secondaryProgress The secondary progress for the progress bar. Valid ranges are from
* 0 to 10000 (both inclusive).
*/
public final void setSecondaryProgress(int secondaryProgress) {
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,
secondaryProgress + Window.PROGRESS_SECONDARY_START);
}
/**
* Suggests an audio stream whose volume should be changed by the hardware
* volume controls.
*
* The suggested audio stream will be tied to the window of this Activity.
* If the Activity is switched, the stream set here is no longer the
* suggested stream. The client does not need to save and restore the old
* suggested stream value in onPause and onResume.
*
* @param streamType The type of the audio stream whose volume should be
* changed by the hardware volume controls. It is not guaranteed that
* the hardware volume controls will always change this stream's
* volume (for example, if a call is in progress, its stream's volume
* may be changed instead). To reset back to the default, use
* {@link AudioManager#USE_DEFAULT_STREAM_TYPE}.
*/
public final void setVolumeControlStream(int streamType) {
getWindow().setVolumeControlStream(streamType);
}
/**
* Gets the suggested audio stream whose volume should be changed by the
* harwdare volume controls.
*
* @return The suggested audio stream type whose volume should be changed by
* the hardware volume controls.
* @see #setVolumeControlStream(int)
*/
public final int getVolumeControlStream() {
return getWindow().getVolumeControlStream();
}
/**
* Runs the specified action on the UI thread. If the current thread is the UI
* thread, then the action is executed immediately. If the current thread is
* not the UI thread, the action is posted to the event queue of the UI thread.
*
* @param action the action to run on the UI thread
*/
public final void runOnUiThread(Runnable action) {
if (Thread.currentThread() != mUiThread) {
mHandler.post(action);
} else {
action.run();
}
}
/**
* Stub implementation of {@link android.view.LayoutInflater.Factory#onCreateView} used when
* inflating with the LayoutInflater returned by {@link #getSystemService}. This
* implementation simply returns null for all view names.
*
* @see android.view.LayoutInflater#createView
* @see android.view.Window#getLayoutInflater
*/
public View onCreateView(String name, Context context, AttributeSet attrs) {
return null;
}
// ------------------ Internal API ------------------
final void setParent(Activity parent) {
mParent = parent;
}
final void attach(Context context, ActivityThread aThread, Instrumentation instr, IBinder token,
Application application, Intent intent, ActivityInfo info, CharSequence title,
Activity parent, String id, Object lastNonConfigurationInstance,
Configuration config) {
attach(context, aThread, instr, token, 0, application, intent, info, title, parent, id,
lastNonConfigurationInstance, null, config);
}
final void attach(Context context, ActivityThread aThread,
Instrumentation instr, IBinder token, int ident,
Application application, Intent intent, ActivityInfo info,
CharSequence title, Activity parent, String id,
Object lastNonConfigurationInstance,
HashMap
*
*
* true to prevent this event from being propagated
* further, or false to indicate that you have not handled
* this event and it should continue to be propagated.
* @see #onKeyUp
* @see android.view.KeyEvent
*/
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (getApplicationInfo().targetSdkVersion
>= Build.VERSION_CODES.ECLAIR) {
event.startTracking();
} else {
onBackPressed();
}
return true;
}
if (mDefaultKeyMode == DEFAULT_KEYS_DISABLE) {
return false;
} else if (mDefaultKeyMode == DEFAULT_KEYS_SHORTCUT) {
if (getWindow().performPanelShortcut(Window.FEATURE_OPTIONS_PANEL,
keyCode, event, Menu.FLAG_ALWAYS_PERFORM_CLOSE)) {
return true;
}
return false;
} else {
// Common code for DEFAULT_KEYS_DIALER & DEFAULT_KEYS_SEARCH_*
boolean clearSpannable = false;
boolean handled;
if ((event.getRepeatCount() != 0) || event.isSystem()) {
clearSpannable = true;
handled = false;
} else {
handled = TextKeyListener.getInstance().onKeyDown(
null, mDefaultKeySsb, keyCode, event);
if (handled && mDefaultKeySsb.length() > 0) {
// something useable has been typed - dispatch it now.
final String str = mDefaultKeySsb.toString();
clearSpannable = true;
switch (mDefaultKeyMode) {
case DEFAULT_KEYS_DIALER:
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + str));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
break;
case DEFAULT_KEYS_SEARCH_LOCAL:
startSearch(str, false, null, false);
break;
case DEFAULT_KEYS_SEARCH_GLOBAL:
startSearch(str, false, null, true);
break;
}
}
}
if (clearSpannable) {
mDefaultKeySsb.clear();
mDefaultKeySsb.clearSpans();
Selection.setSelection(mDefaultKeySsb,0);
}
return handled;
}
}
/**
* Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent)
* KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle
* the event).
*/
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
return false;
}
/**
* Called when a key was released and not handled by any of the views
* inside of the activity. So, for example, key presses while the cursor
* is inside a TextView will not trigger the event (unless it is a navigation
* to another object) because TextView handles its own key presses.
*
* true to prevent this event from being propagated
* further, or false to indicate that you have not handled
* this event and it should continue to be propagated.
* @see #onKeyDown
* @see KeyEvent
*/
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (getApplicationInfo().targetSdkVersion
>= Build.VERSION_CODES.ECLAIR) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.isTracking()
&& !event.isCanceled()) {
onBackPressed();
return true;
}
}
return false;
}
/**
* Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
* KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle
* the event).
*/
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
return false;
}
/**
* Called when the activity has detected the user's press of the back
* key. The default implementation simply finishes the current activity,
* but you can override this to do whatever you want.
*/
public void onBackPressed() {
finish();
}
/**
* Called when a touch screen event was not handled by any of the views
* under it. This is most useful to process touch events that happen
* outside of your window bounds, where there is no view to receive it.
*
* @param event The touch screen event being processed.
*
* @return Return true if you have consumed the event, false if you haven't.
* The default implementation always returns false.
*/
public boolean onTouchEvent(MotionEvent event) {
return false;
}
/**
* Called when the trackball was moved and not handled by any of the
* views inside of the activity. So, for example, if the trackball moves
* while focus is on a button, you will receive a call here because
* buttons do not normally do anything with trackball events. The call
* here happens before trackball movements are converted to
* DPAD key events, which then get sent back to the view hierarchy, and
* will be processed at the point for things like focus navigation.
*
* @param event The trackball event being processed.
*
* @return Return true if you have consumed the event, false if you haven't.
* The default implementation always returns false.
*/
public boolean onTrackballEvent(MotionEvent event) {
return false;
}
/**
* Called whenever a key, touch, or trackball event is dispatched to the
* activity. Implement this method if you wish to know that the user has
* interacted with the device in some way while your activity is running.
* This callback and {@link #onUserLeaveHint} are intended to help
* activities manage status bar notifications intelligently; specifically,
* for helping activities determine the proper time to cancel a notfication.
*
*