286 lines
10 KiB
Java
286 lines
10 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.content;
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import android.app.ActivityManagerNative;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IIntentSender;
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import android.content.IIntentReceiver;
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import android.os.Bundle;
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import android.os.RemoteException;
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import android.os.Handler;
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import android.os.IBinder;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.util.AndroidException;
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/**
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* A description of an Intent and target action to perform with it.
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* The returned object can be
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* handed to other applications so that they can perform the action you
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* described on your behalf at a later time.
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*
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* <p>By giving a IntentSender to another application,
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* you are granting it the right to perform the operation you have specified
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* as if the other application was yourself (with the same permissions and
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* identity). As such, you should be careful about how you build the IntentSender:
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* often, for example, the base Intent you supply will have the component
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* name explicitly set to one of your own components, to ensure it is ultimately
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* sent there and nowhere else.
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*
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* <p>A IntentSender itself is simply a reference to a token maintained by
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* the system describing the original data used to retrieve it. This means
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* that, even if its owning application's process is killed, the
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* IntentSender itself will remain usable from other processes that
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* have been given it. If the creating application later re-retrieves the
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* same kind of IntentSender (same operation, same Intent action, data,
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* categories, and components, and same flags), it will receive a IntentSender
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* representing the same token if that is still valid.
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*
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* <p>Instances of this class can not be made directly, but rather must be
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* created from an existing {@link android.app.PendingIntent} with
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* {@link android.app.PendingIntent#getIntentSender() PendingIntent.getIntentSender()}.
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*/
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public class IntentSender implements Parcelable {
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private final IIntentSender mTarget;
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/**
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* Exception thrown when trying to send through a PendingIntent that
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* has been canceled or is otherwise no longer able to execute the request.
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*/
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public static class SendIntentException extends AndroidException {
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public SendIntentException() {
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}
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public SendIntentException(String name) {
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super(name);
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}
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public SendIntentException(Exception cause) {
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super(cause);
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}
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}
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/**
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* Callback interface for discovering when a send operation has
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* completed. Primarily for use with a IntentSender that is
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* performing a broadcast, this provides the same information as
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* calling {@link Context#sendOrderedBroadcast(Intent, String,
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* android.content.BroadcastReceiver, Handler, int, String, Bundle)
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* Context.sendBroadcast()} with a final BroadcastReceiver.
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*/
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public interface OnFinished {
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/**
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* Called when a send operation as completed.
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*
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* @param IntentSender The IntentSender this operation was sent through.
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* @param intent The original Intent that was sent.
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* @param resultCode The final result code determined by the send.
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* @param resultData The final data collected by a broadcast.
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* @param resultExtras The final extras collected by a broadcast.
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*/
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void onSendFinished(IntentSender IntentSender, Intent intent,
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int resultCode, String resultData, Bundle resultExtras);
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}
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private static class FinishedDispatcher extends IIntentReceiver.Stub
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implements Runnable {
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private final IntentSender mIntentSender;
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private final OnFinished mWho;
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private final Handler mHandler;
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private Intent mIntent;
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private int mResultCode;
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private String mResultData;
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private Bundle mResultExtras;
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FinishedDispatcher(IntentSender pi, OnFinished who, Handler handler) {
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mIntentSender = pi;
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mWho = who;
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mHandler = handler;
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}
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public void performReceive(Intent intent, int resultCode,
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String data, Bundle extras, boolean serialized, boolean sticky) {
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mIntent = intent;
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mResultCode = resultCode;
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mResultData = data;
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mResultExtras = extras;
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if (mHandler == null) {
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run();
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} else {
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mHandler.post(this);
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}
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}
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public void run() {
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mWho.onSendFinished(mIntentSender, mIntent, mResultCode,
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mResultData, mResultExtras);
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}
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}
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/**
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* Perform the operation associated with this IntentSender, allowing the
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* caller to specify information about the Intent to use and be notified
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* when the send has completed.
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*
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* @param context The Context of the caller. This may be null if
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* <var>intent</var> is also null.
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* @param code Result code to supply back to the IntentSender's target.
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* @param intent Additional Intent data. See {@link Intent#fillIn
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* Intent.fillIn()} for information on how this is applied to the
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* original Intent. Use null to not modify the original Intent.
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* @param onFinished The object to call back on when the send has
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* completed, or null for no callback.
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* @param handler Handler identifying the thread on which the callback
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* should happen. If null, the callback will happen from the thread
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* pool of the process.
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*
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*
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* @throws SendIntentException Throws CanceledIntentException if the IntentSender
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* is no longer allowing more intents to be sent through it.
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*/
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public void sendIntent(Context context, int code, Intent intent,
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OnFinished onFinished, Handler handler) throws SendIntentException {
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try {
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String resolvedType = intent != null ?
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intent.resolveTypeIfNeeded(context.getContentResolver())
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: null;
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int res = mTarget.send(code, intent, resolvedType,
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onFinished != null
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? new FinishedDispatcher(this, onFinished, handler)
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: null);
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if (res < 0) {
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throw new SendIntentException();
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}
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} catch (RemoteException e) {
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throw new SendIntentException();
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}
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}
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/**
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* Return the package name of the application that created this
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* IntentSender, that is the identity under which you will actually be
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* sending the Intent. The returned string is supplied by the system, so
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* that an application can not spoof its package.
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*
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* @return The package name of the PendingIntent, or null if there is
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* none associated with it.
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*/
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public String getTargetPackage() {
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try {
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return ActivityManagerNative.getDefault()
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.getPackageForIntentSender(mTarget);
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} catch (RemoteException e) {
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// Should never happen.
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return null;
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}
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}
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/**
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* Comparison operator on two IntentSender objects, such that true
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* is returned then they both represent the same operation from the
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* same package.
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*/
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@Override
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public boolean equals(Object otherObj) {
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if (otherObj instanceof IntentSender) {
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return mTarget.asBinder().equals(((IntentSender)otherObj)
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.mTarget.asBinder());
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}
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return false;
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}
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@Override
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public int hashCode() {
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return mTarget.asBinder().hashCode();
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder(128);
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sb.append("IntentSender{");
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sb.append(Integer.toHexString(System.identityHashCode(this)));
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sb.append(": ");
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sb.append(mTarget != null ? mTarget.asBinder() : null);
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sb.append('}');
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return sb.toString();
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}
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public int describeContents() {
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return 0;
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}
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public void writeToParcel(Parcel out, int flags) {
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out.writeStrongBinder(mTarget.asBinder());
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}
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public static final Parcelable.Creator<IntentSender> CREATOR
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= new Parcelable.Creator<IntentSender>() {
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public IntentSender createFromParcel(Parcel in) {
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IBinder target = in.readStrongBinder();
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return target != null ? new IntentSender(target) : null;
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}
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public IntentSender[] newArray(int size) {
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return new IntentSender[size];
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}
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};
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/**
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* Convenience function for writing either a IntentSender or null pointer to
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* a Parcel. You must use this with {@link #readIntentSenderOrNullFromParcel}
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* for later reading it.
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*
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* @param sender The IntentSender to write, or null.
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* @param out Where to write the IntentSender.
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*/
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public static void writeIntentSenderOrNullToParcel(IntentSender sender,
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Parcel out) {
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out.writeStrongBinder(sender != null ? sender.mTarget.asBinder()
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: null);
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}
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/**
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* Convenience function for reading either a Messenger or null pointer from
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* a Parcel. You must have previously written the Messenger with
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* {@link #writeIntentSenderOrNullToParcel}.
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*
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* @param in The Parcel containing the written Messenger.
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*
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* @return Returns the Messenger read from the Parcel, or null if null had
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* been written.
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*/
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public static IntentSender readIntentSenderOrNullFromParcel(Parcel in) {
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IBinder b = in.readStrongBinder();
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return b != null ? new IntentSender(b) : null;
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}
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/** @hide */
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public IIntentSender getTarget() {
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return mTarget;
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}
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/** @hide */
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public IntentSender(IIntentSender target) {
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mTarget = target;
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}
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/** @hide */
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public IntentSender(IBinder target) {
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mTarget = IIntentSender.Stub.asInterface(target);
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}
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}
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