709 lines
22 KiB
Java
709 lines
22 KiB
Java
/*
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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.widget;
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import com.android.internal.R;
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import android.app.LocalActivityManager;
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import android.content.Context;
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import android.content.Intent;
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import android.graphics.drawable.Drawable;
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import android.os.Build;
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import android.util.AttributeSet;
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import android.view.KeyEvent;
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import android.view.LayoutInflater;
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import android.view.SoundEffectConstants;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewTreeObserver;
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import android.view.Window;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Container for a tabbed window view. This object holds two children: a set of tab labels that the
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* user clicks to select a specific tab, and a FrameLayout object that displays the contents of that
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* page. The individual elements are typically controlled using this container object, rather than
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* setting values on the child elements themselves.
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*
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* <p>See the <a href="{@docRoot}resources/tutorials/views/hello-tabwidget.html">Tab Layout
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* tutorial</a>.</p>
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*/
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public class TabHost extends FrameLayout implements ViewTreeObserver.OnTouchModeChangeListener {
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private TabWidget mTabWidget;
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private FrameLayout mTabContent;
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private List<TabSpec> mTabSpecs = new ArrayList<TabSpec>(2);
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/**
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* This field should be made private, so it is hidden from the SDK.
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* {@hide}
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*/
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protected int mCurrentTab = -1;
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/**
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* This field when set to true ensures that first tab is not set as the current tab
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* by preventing the addTab() from calling setCurrentTab() with index set to 0.
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* To ensure that the operations of an application are not changed, it should be set to
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* false whenever mCurrenttab is set to -1.
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* {@hide}
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*/
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private boolean mAvoidFirstTabLoad = false;
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private View mCurrentView = null;
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/**
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* This field should be made private, so it is hidden from the SDK.
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* {@hide}
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*/
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protected LocalActivityManager mLocalActivityManager = null;
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private OnTabChangeListener mOnTabChangeListener;
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private OnKeyListener mTabKeyListener;
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public TabHost(Context context) {
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super(context);
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initTabHost();
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}
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public TabHost(Context context, AttributeSet attrs) {
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super(context, attrs);
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initTabHost();
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}
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private void initTabHost() {
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setFocusableInTouchMode(true);
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setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
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mCurrentTab = -1;
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mAvoidFirstTabLoad = false;
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mCurrentView = null;
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}
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/**
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* Get a new {@link TabSpec} associated with this tab host.
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* @param tag required tag of tab.
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*/
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public TabSpec newTabSpec(String tag) {
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return new TabSpec(tag);
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}
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/**
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* <p>Call setup() before adding tabs if loading TabHost using findViewById().
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* <i><b>However</i></b>: You do not need to call setup() after getTabHost()
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* in {@link android.app.TabActivity TabActivity}.
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* Example:</p>
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<pre>mTabHost = (TabHost)findViewById(R.id.tabhost);
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mTabHost.setup();
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mTabHost.addTab(TAB_TAG_1, "Hello, world!", "Tab 1");
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*/
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public void setup() {
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mTabWidget = (TabWidget) findViewById(com.android.internal.R.id.tabs);
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if (mTabWidget == null) {
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throw new RuntimeException(
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"Your TabHost must have a TabWidget whose id attribute is 'android.R.id.tabs'");
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}
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// KeyListener to attach to all tabs. Detects non-navigation keys
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// and relays them to the tab content.
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mTabKeyListener = new OnKeyListener() {
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public boolean onKey(View v, int keyCode, KeyEvent event) {
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switch (keyCode) {
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case KeyEvent.KEYCODE_DPAD_CENTER:
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case KeyEvent.KEYCODE_DPAD_LEFT:
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case KeyEvent.KEYCODE_DPAD_RIGHT:
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case KeyEvent.KEYCODE_DPAD_UP:
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case KeyEvent.KEYCODE_DPAD_DOWN:
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case KeyEvent.KEYCODE_ENTER:
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return false;
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}
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mTabContent.requestFocus(View.FOCUS_FORWARD);
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return mTabContent.dispatchKeyEvent(event);
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}
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};
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mTabWidget.setTabSelectionListener(new TabWidget.OnTabSelectionChanged() {
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public void onTabSelectionChanged(int tabIndex, boolean clicked) {
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setCurrentTab(tabIndex);
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if (clicked) {
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mTabContent.requestFocus(View.FOCUS_FORWARD);
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}
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}
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});
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mTabContent = (FrameLayout) findViewById(com.android.internal.R.id.tabcontent);
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if (mTabContent == null) {
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throw new RuntimeException(
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"Your TabHost must have a FrameLayout whose id attribute is "
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+ "'android.R.id.tabcontent'");
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}
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}
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/**
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* If you are using {@link TabSpec#setContent(android.content.Intent)}, this
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* must be called since the activityGroup is needed to launch the local activity.
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*
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* This is done for you if you extend {@link android.app.TabActivity}.
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* @param activityGroup Used to launch activities for tab content.
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*/
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public void setup(LocalActivityManager activityGroup) {
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setup();
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mLocalActivityManager = activityGroup;
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}
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@Override
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protected void onAttachedToWindow() {
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super.onAttachedToWindow();
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final ViewTreeObserver treeObserver = getViewTreeObserver();
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if (treeObserver != null) {
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treeObserver.addOnTouchModeChangeListener(this);
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}
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}
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@Override
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protected void onDetachedFromWindow() {
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super.onDetachedFromWindow();
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final ViewTreeObserver treeObserver = getViewTreeObserver();
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if (treeObserver != null) {
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treeObserver.removeOnTouchModeChangeListener(this);
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}
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}
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/**
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* {@inheritDoc}
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*/
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public void onTouchModeChanged(boolean isInTouchMode) {
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if (!isInTouchMode) {
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// leaving touch mode.. if nothing has focus, let's give it to
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// the indicator of the current tab
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if (mCurrentView != null && (!mCurrentView.hasFocus() || mCurrentView.isFocused())) {
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mTabWidget.getChildTabViewAt(mCurrentTab).requestFocus();
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}
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}
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}
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/**
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* Add a tab.
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* @param tabSpec Specifies how to create the indicator and content.
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*/
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public void addTab(TabSpec tabSpec) {
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if (tabSpec.mIndicatorStrategy == null) {
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throw new IllegalArgumentException("you must specify a way to create the tab indicator.");
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}
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if (tabSpec.mContentStrategy == null) {
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throw new IllegalArgumentException("you must specify a way to create the tab content");
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}
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View tabIndicator = tabSpec.mIndicatorStrategy.createIndicatorView();
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tabIndicator.setOnKeyListener(mTabKeyListener);
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// If this is a custom view, then do not draw the bottom strips for
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// the tab indicators.
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if (tabSpec.mIndicatorStrategy instanceof ViewIndicatorStrategy) {
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mTabWidget.setStripEnabled(false);
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}
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mTabWidget.addView(tabIndicator);
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mTabSpecs.add(tabSpec);
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// The second test is always true except when an application explicitly sets
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// mAvoidFirstTabLoad to true.
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if (mCurrentTab == -1 && !mAvoidFirstTabLoad) {
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setCurrentTab(0);
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}
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}
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/**
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* Removes all tabs from the tab widget associated with this tab host.
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*/
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public void clearAllTabs() {
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mTabWidget.removeAllViews();
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initTabHost();
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mTabContent.removeAllViews();
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mTabSpecs.clear();
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requestLayout();
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invalidate();
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}
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public TabWidget getTabWidget() {
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return mTabWidget;
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}
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public int getCurrentTab() {
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return mCurrentTab;
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}
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public String getCurrentTabTag() {
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if (mCurrentTab >= 0 && mCurrentTab < mTabSpecs.size()) {
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return mTabSpecs.get(mCurrentTab).getTag();
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}
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return null;
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}
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public View getCurrentTabView() {
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if (mCurrentTab >= 0 && mCurrentTab < mTabSpecs.size()) {
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return mTabWidget.getChildTabViewAt(mCurrentTab);
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}
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return null;
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}
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public View getCurrentView() {
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return mCurrentView;
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}
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/**
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* {@hide}
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*/
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public void setAvoidFirstTabLoad(boolean flag) {
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mAvoidFirstTabLoad = flag;
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}
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/**
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* {@hide}
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*/
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public void setCurrentTabToZero() {
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mCurrentTab = 0;
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}
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public void setCurrentTabByTag(String tag) {
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int i;
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for (i = 0; i < mTabSpecs.size(); i++) {
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if (mTabSpecs.get(i).getTag().equals(tag)) {
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setCurrentTab(i);
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break;
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}
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}
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}
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/**
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* Get the FrameLayout which holds tab content
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*/
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public FrameLayout getTabContentView() {
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return mTabContent;
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}
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@Override
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public boolean dispatchKeyEvent(KeyEvent event) {
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final boolean handled = super.dispatchKeyEvent(event);
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// unhandled key ups change focus to tab indicator for embedded activities
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// when there is nothing that will take focus from default focus searching
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if (!handled
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&& (event.getAction() == KeyEvent.ACTION_DOWN)
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&& (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_UP)
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&& (mCurrentView != null)
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&& (mCurrentView.isRootNamespace())
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&& (mCurrentView.hasFocus())
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&& (mCurrentView.findFocus().focusSearch(View.FOCUS_UP) == null)) {
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mTabWidget.getChildTabViewAt(mCurrentTab).requestFocus();
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playSoundEffect(SoundEffectConstants.NAVIGATION_UP);
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return true;
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}
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return handled;
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}
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@Override
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public void dispatchWindowFocusChanged(boolean hasFocus) {
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if (mCurrentView != null){
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mCurrentView.dispatchWindowFocusChanged(hasFocus);
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}
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}
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public void setCurrentTab(int index) {
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if (index < 0 || index >= mTabSpecs.size()) {
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return;
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}
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if (index == mCurrentTab) {
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return;
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}
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// notify old tab content
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if (mCurrentTab != -1) {
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mTabSpecs.get(mCurrentTab).mContentStrategy.tabClosed();
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}
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mCurrentTab = index;
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final TabHost.TabSpec spec = mTabSpecs.get(index);
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// Call the tab widget's focusCurrentTab(), instead of just
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// selecting the tab.
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mTabWidget.focusCurrentTab(mCurrentTab);
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// tab content
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mCurrentView = spec.mContentStrategy.getContentView();
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if (mCurrentView.getParent() == null) {
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mTabContent
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.addView(
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mCurrentView,
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new ViewGroup.LayoutParams(
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ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.MATCH_PARENT));
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}
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if (!mTabWidget.hasFocus()) {
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// if the tab widget didn't take focus (likely because we're in touch mode)
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// give the current tab content view a shot
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mCurrentView.requestFocus();
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}
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//mTabContent.requestFocus(View.FOCUS_FORWARD);
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invokeOnTabChangeListener();
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}
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/**
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* Register a callback to be invoked when the selected state of any of the items
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* in this list changes
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* @param l
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* The callback that will run
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*/
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public void setOnTabChangedListener(OnTabChangeListener l) {
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mOnTabChangeListener = l;
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}
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private void invokeOnTabChangeListener() {
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if (mOnTabChangeListener != null) {
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mOnTabChangeListener.onTabChanged(getCurrentTabTag());
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}
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}
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/**
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* Interface definition for a callback to be invoked when tab changed
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*/
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public interface OnTabChangeListener {
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void onTabChanged(String tabId);
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}
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/**
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* Makes the content of a tab when it is selected. Use this if your tab
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* content needs to be created on demand, i.e. you are not showing an
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* existing view or starting an activity.
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*/
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public interface TabContentFactory {
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/**
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* Callback to make the tab contents
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*
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* @param tag
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* Which tab was selected.
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* @return The view to display the contents of the selected tab.
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*/
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View createTabContent(String tag);
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}
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/**
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* A tab has a tab indicator, content, and a tag that is used to keep
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* track of it. This builder helps choose among these options.
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*
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* For the tab indicator, your choices are:
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* 1) set a label
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* 2) set a label and an icon
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*
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* For the tab content, your choices are:
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* 1) the id of a {@link View}
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* 2) a {@link TabContentFactory} that creates the {@link View} content.
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* 3) an {@link Intent} that launches an {@link android.app.Activity}.
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*/
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public class TabSpec {
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private String mTag;
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private IndicatorStrategy mIndicatorStrategy;
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private ContentStrategy mContentStrategy;
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private TabSpec(String tag) {
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mTag = tag;
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}
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/**
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* Specify a label as the tab indicator.
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*/
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public TabSpec setIndicator(CharSequence label) {
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mIndicatorStrategy = new LabelIndicatorStrategy(label);
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return this;
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}
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/**
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* Specify a label and icon as the tab indicator.
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*/
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public TabSpec setIndicator(CharSequence label, Drawable icon) {
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mIndicatorStrategy = new LabelAndIconIndicatorStrategy(label, icon);
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return this;
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}
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/**
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* Specify a view as the tab indicator.
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*/
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public TabSpec setIndicator(View view) {
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mIndicatorStrategy = new ViewIndicatorStrategy(view);
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return this;
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}
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/**
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* Specify the id of the view that should be used as the content
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* of the tab.
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*/
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public TabSpec setContent(int viewId) {
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mContentStrategy = new ViewIdContentStrategy(viewId);
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return this;
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}
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/**
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* Specify a {@link android.widget.TabHost.TabContentFactory} to use to
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* create the content of the tab.
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*/
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public TabSpec setContent(TabContentFactory contentFactory) {
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mContentStrategy = new FactoryContentStrategy(mTag, contentFactory);
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return this;
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}
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/**
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* Specify an intent to use to launch an activity as the tab content.
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*/
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public TabSpec setContent(Intent intent) {
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mContentStrategy = new IntentContentStrategy(mTag, intent);
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return this;
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}
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public String getTag() {
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return mTag;
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}
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}
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/**
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* Specifies what you do to create a tab indicator.
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*/
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private static interface IndicatorStrategy {
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/**
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* Return the view for the indicator.
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*/
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View createIndicatorView();
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}
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/**
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* Specifies what you do to manage the tab content.
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*/
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private static interface ContentStrategy {
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/**
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* Return the content view. The view should may be cached locally.
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*/
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View getContentView();
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/**
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* Perhaps do something when the tab associated with this content has
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* been closed (i.e make it invisible, or remove it).
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*/
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void tabClosed();
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}
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/**
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* How to create a tab indicator that just has a label.
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*/
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private class LabelIndicatorStrategy implements IndicatorStrategy {
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private final CharSequence mLabel;
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private LabelIndicatorStrategy(CharSequence label) {
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mLabel = label;
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}
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public View createIndicatorView() {
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final Context context = getContext();
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LayoutInflater inflater =
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(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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View tabIndicator = inflater.inflate(R.layout.tab_indicator,
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mTabWidget, // tab widget is the parent
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false); // no inflate params
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final TextView tv = (TextView) tabIndicator.findViewById(R.id.title);
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tv.setText(mLabel);
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if (context.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.DONUT) {
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// Donut apps get old color scheme
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tabIndicator.setBackgroundResource(R.drawable.tab_indicator_v4);
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tv.setTextColor(context.getResources().getColorStateList(R.color.tab_indicator_text_v4));
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}
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return tabIndicator;
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}
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}
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/**
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* How we create a tab indicator that has a label and an icon
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*/
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private class LabelAndIconIndicatorStrategy implements IndicatorStrategy {
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private final CharSequence mLabel;
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private final Drawable mIcon;
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private LabelAndIconIndicatorStrategy(CharSequence label, Drawable icon) {
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mLabel = label;
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mIcon = icon;
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}
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public View createIndicatorView() {
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final Context context = getContext();
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LayoutInflater inflater =
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(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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View tabIndicator = inflater.inflate(R.layout.tab_indicator,
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mTabWidget, // tab widget is the parent
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false); // no inflate params
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final TextView tv = (TextView) tabIndicator.findViewById(R.id.title);
|
|
tv.setText(mLabel);
|
|
|
|
final ImageView iconView = (ImageView) tabIndicator.findViewById(R.id.icon);
|
|
iconView.setImageDrawable(mIcon);
|
|
|
|
if (context.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.DONUT) {
|
|
// Donut apps get old color scheme
|
|
tabIndicator.setBackgroundResource(R.drawable.tab_indicator_v4);
|
|
tv.setTextColor(context.getResources().getColorStateList(R.color.tab_indicator_text_v4));
|
|
}
|
|
|
|
return tabIndicator;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* How to create a tab indicator by specifying a view.
|
|
*/
|
|
private class ViewIndicatorStrategy implements IndicatorStrategy {
|
|
|
|
private final View mView;
|
|
|
|
private ViewIndicatorStrategy(View view) {
|
|
mView = view;
|
|
}
|
|
|
|
public View createIndicatorView() {
|
|
return mView;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* How to create the tab content via a view id.
|
|
*/
|
|
private class ViewIdContentStrategy implements ContentStrategy {
|
|
|
|
private final View mView;
|
|
|
|
private ViewIdContentStrategy(int viewId) {
|
|
mView = mTabContent.findViewById(viewId);
|
|
if (mView != null) {
|
|
mView.setVisibility(View.GONE);
|
|
} else {
|
|
throw new RuntimeException("Could not create tab content because " +
|
|
"could not find view with id " + viewId);
|
|
}
|
|
}
|
|
|
|
public View getContentView() {
|
|
mView.setVisibility(View.VISIBLE);
|
|
return mView;
|
|
}
|
|
|
|
public void tabClosed() {
|
|
mView.setVisibility(View.GONE);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* How tab content is managed using {@link TabContentFactory}.
|
|
*/
|
|
private class FactoryContentStrategy implements ContentStrategy {
|
|
private View mTabContent;
|
|
private final CharSequence mTag;
|
|
private TabContentFactory mFactory;
|
|
|
|
public FactoryContentStrategy(CharSequence tag, TabContentFactory factory) {
|
|
mTag = tag;
|
|
mFactory = factory;
|
|
}
|
|
|
|
public View getContentView() {
|
|
if (mTabContent == null) {
|
|
mTabContent = mFactory.createTabContent(mTag.toString());
|
|
}
|
|
mTabContent.setVisibility(View.VISIBLE);
|
|
return mTabContent;
|
|
}
|
|
|
|
public void tabClosed() {
|
|
mTabContent.setVisibility(View.GONE);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* How tab content is managed via an {@link Intent}: the content view is the
|
|
* decorview of the launched activity.
|
|
*/
|
|
private class IntentContentStrategy implements ContentStrategy {
|
|
|
|
private final String mTag;
|
|
private final Intent mIntent;
|
|
|
|
private View mLaunchedView;
|
|
|
|
private IntentContentStrategy(String tag, Intent intent) {
|
|
mTag = tag;
|
|
mIntent = intent;
|
|
}
|
|
|
|
public View getContentView() {
|
|
if (mLocalActivityManager == null) {
|
|
throw new IllegalStateException("Did you forget to call 'public void setup(LocalActivityManager activityGroup)'?");
|
|
}
|
|
final Window w = mLocalActivityManager.startActivity(
|
|
mTag, mIntent);
|
|
final View wd = w != null ? w.getDecorView() : null;
|
|
if (mLaunchedView != wd && mLaunchedView != null) {
|
|
if (mLaunchedView.getParent() != null) {
|
|
mTabContent.removeView(mLaunchedView);
|
|
}
|
|
}
|
|
mLaunchedView = wd;
|
|
|
|
// XXX Set FOCUS_AFTER_DESCENDANTS on embedded activities for now so they can get
|
|
// focus if none of their children have it. They need focus to be able to
|
|
// display menu items.
|
|
//
|
|
// Replace this with something better when Bug 628886 is fixed...
|
|
//
|
|
if (mLaunchedView != null) {
|
|
mLaunchedView.setVisibility(View.VISIBLE);
|
|
mLaunchedView.setFocusableInTouchMode(true);
|
|
((ViewGroup) mLaunchedView).setDescendantFocusability(
|
|
FOCUS_AFTER_DESCENDANTS);
|
|
}
|
|
return mLaunchedView;
|
|
}
|
|
|
|
public void tabClosed() {
|
|
if (mLaunchedView != null) {
|
|
mLaunchedView.setVisibility(View.GONE);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|