policy/src/com/android/internal/policy/impl/RecentApplicationsDialog.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2008 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.internal.policy.impl;

 import android.app.ActivityManager;
 import android.app.Dialog;
 import android.app.StatusBarManager;
 import android.content.ActivityNotFoundException;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.os.Handler;
 import android.util.Log;
 import android.view.KeyEvent;
 import android.view.SoundEffectConstants;
 import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
 import android.view.View.OnClickListener;
 import android.widget.TextView;

 import java.util.List;

 public class RecentApplicationsDialog extends Dialog implements OnClickListener {
     // Elements for debugging support
 //  private static final String LOG_TAG = "RecentApplicationsDialog";
     private static final boolean DBG_FORCE_EMPTY_LIST = false;

     static private StatusBarManager sStatusBar;

     private static final int NUM_BUTTONS = 8;
     private static final int MAX_RECENT_TASKS = NUM_BUTTONS * 2;    // allow for some discards

     final TextView[] mIcons = new TextView[NUM_BUTTONS];
     View mNoAppsText;
     IntentFilter mBroadcastIntentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);

     class RecentTag {
         ActivityManager.RecentTaskInfo info;
         Intent intent;
     }

     Handler mHandler = new Handler();
     Runnable mCleanup = new Runnable() {
         public void run() {
             // dump extra memory we're hanging on to
             for (TextView icon: mIcons) {
                 icon.setCompoundDrawables(null, null, null, null);
                 icon.setTag(null);
             }
         }
     };

     public RecentApplicationsDialog(Context context) {
         super(context, com.android.internal.R.style.Theme_Dialog_RecentApplications);

     }

     /**
      * We create the recent applications dialog just once, and it stays around (hidden)
      * until activated by the user.
      *
      * @see PhoneWindowManager#showRecentAppsDialog
      */
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         Context context = getContext();

         if (sStatusBar == null) {
             sStatusBar = (StatusBarManager)context.getSystemService(Context.STATUS_BAR_SERVICE);
         }

         Window window = getWindow();
         window.requestFeature(Window.FEATURE_NO_TITLE);
         window.setType(WindowManager.LayoutParams.TYPE_RECENTS_OVERLAY);
         window.setFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
                 WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
         window.setTitle("Recents");

         setContentView(com.android.internal.R.layout.recent_apps_dialog);

         final WindowManager.LayoutParams params = window.getAttributes();
         params.width = WindowManager.LayoutParams.MATCH_PARENT;
         params.height = WindowManager.LayoutParams.MATCH_PARENT;
         window.setAttributes(params);
         window.setFlags(0, WindowManager.LayoutParams.FLAG_DIM_BEHIND);

         mIcons[0] = (TextView)findViewById(com.android.internal.R.id.button0);
         mIcons[1] = (TextView)findViewById(com.android.internal.R.id.button1);
         mIcons[2] = (TextView)findViewById(com.android.internal.R.id.button2);
         mIcons[3] = (TextView)findViewById(com.android.internal.R.id.button3);
         mIcons[4] = (TextView)findViewById(com.android.internal.R.id.button4);
         mIcons[5] = (TextView)findViewById(com.android.internal.R.id.button5);
         mIcons[6] = (TextView)findViewById(com.android.internal.R.id.button6);
         mIcons[7] = (TextView)findViewById(com.android.internal.R.id.button7);
         mNoAppsText = findViewById(com.android.internal.R.id.no_applications_message);

         for (TextView b: mIcons) {
             b.setOnClickListener(this);
         }
     }

     @Override
       public boolean onKeyDown(int keyCode, KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_TAB) {
             // Ignore all meta keys other than SHIFT.  The app switch key could be a
             // fallback action chorded with ALT, META or even CTRL depending on the key map.
             // DPad navigation is handled by the ViewRoot elsewhere.
             final boolean backward = event.isShiftPressed();
             final int numIcons = mIcons.length;
             int numButtons = 0;
             while (numButtons < numIcons && mIcons[numButtons].getVisibility() == View.VISIBLE) {
                 numButtons += 1;
             }
             if (numButtons != 0) {
                 int nextFocus = backward ? numButtons - 1 : 0;
                 for (int i = 0; i < numButtons; i++) {
                     if (mIcons[i].hasFocus()) {
                         if (backward) {
                             nextFocus = (i + numButtons - 1) % numButtons;
                         } else {
                             nextFocus = (i + 1) % numButtons;
                         }
                         break;
                     }
                 }
                 final int direction = backward ? View.FOCUS_BACKWARD : View.FOCUS_FORWARD;
                 if (mIcons[nextFocus].requestFocus(direction)) {
                     mIcons[nextFocus].playSoundEffect(
                             SoundEffectConstants.getContantForFocusDirection(direction));
                 }
             }

             // The dialog always handles the key to prevent the ViewRoot from
             // performing the default navigation itself.
             return true;
         }

         return super.onKeyDown(keyCode, event);
     }

     /**
      * Dismiss the dialog and switch to the selected application.
      */
     public void dismissAndSwitch() {
         final int numIcons = mIcons.length;
         RecentTag tag = null;
         for (int i = 0; i < numIcons; i++) {
             if (mIcons[i].getVisibility() != View.VISIBLE) {
                 break;
             }
             if (i == 0 || mIcons[i].hasFocus()) {
                 tag = (RecentTag) mIcons[i].getTag();
                 if (mIcons[i].hasFocus()) {
                     break;
                 }
             }
         }
         if (tag != null) {
             switchTo(tag);
         }
         dismiss();
     }

     /**
      * Handler for user clicks.  If a button was clicked, launch the corresponding activity.
      */
     public void onClick(View v) {
         for (TextView b: mIcons) {
             if (b == v) {
                 RecentTag tag = (RecentTag)b.getTag();
                 switchTo(tag);
                 break;
             }
         }
         dismiss();
     }

     private void switchTo(RecentTag tag) {
         if (tag.info.id >= 0) {
             // This is an active task; it should just go to the foreground.
             final ActivityManager am = (ActivityManager)
                     getContext().getSystemService(Context.ACTIVITY_SERVICE);
             am.moveTaskToFront(tag.info.id, ActivityManager.MOVE_TASK_WITH_HOME);
         } else if (tag.intent != null) {
             tag.intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
                     | Intent.FLAG_ACTIVITY_TASK_ON_HOME);
             try {
                 getContext().startActivity(tag.intent);
             } catch (ActivityNotFoundException e) {
                 Log.w("Recent", "Unable to launch recent task", e);
             }
         }
     }

     /**
      * Set up and show the recent activities dialog.
      */
     @Override
     public void onStart() {
         super.onStart();
         reloadButtons();
         if (sStatusBar != null) {
             sStatusBar.disable(StatusBarManager.DISABLE_EXPAND);
         }

         // receive broadcasts
         getContext().registerReceiver(mBroadcastReceiver, mBroadcastIntentFilter);

         mHandler.removeCallbacks(mCleanup);
     }

     /**
      * Dismiss the recent activities dialog.
      */
     @Override
     public void onStop() {
         super.onStop();

         if (sStatusBar != null) {
             sStatusBar.disable(StatusBarManager.DISABLE_NONE);
         }

         // stop receiving broadcasts
         getContext().unregisterReceiver(mBroadcastReceiver);

         mHandler.postDelayed(mCleanup, 100);
      }

     /**
      * Reload the 6 buttons with recent activities
      */
     private void reloadButtons() {

         final Context context = getContext();
         final PackageManager pm = context.getPackageManager();
         final ActivityManager am = (ActivityManager)
                 context.getSystemService(Context.ACTIVITY_SERVICE);
         final List<ActivityManager.RecentTaskInfo> recentTasks =
                 am.getRecentTasks(MAX_RECENT_TASKS, ActivityManager.RECENT_IGNORE_UNAVAILABLE);

         ActivityInfo homeInfo =
             new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME)
                     .resolveActivityInfo(pm, 0);

         IconUtilities iconUtilities = new IconUtilities(getContext());

         // Performance note:  Our android performance guide says to prefer Iterator when
         // using a List class, but because we know that getRecentTasks() always returns
         // an ArrayList<>, we'll use a simple index instead.
         int index = 0;
         int numTasks = recentTasks.size();
         for (int i = 0; i < numTasks && (index < NUM_BUTTONS); ++i) {
             final ActivityManager.RecentTaskInfo info = recentTasks.get(i);

             // for debug purposes only, disallow first result to create empty lists
             if (DBG_FORCE_EMPTY_LIST && (i == 0)) continue;

             Intent intent = new Intent(info.baseIntent);
             if (info.origActivity != null) {
                 intent.setComponent(info.origActivity);
             }

             // Skip the current home activity.
             if (homeInfo != null) {
                 if (homeInfo.packageName.equals(
                         intent.getComponent().getPackageName())
                         && homeInfo.name.equals(
                                 intent.getComponent().getClassName())) {
                     continue;
                 }
             }

             intent.setFlags((intent.getFlags()&~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
                     | Intent.FLAG_ACTIVITY_NEW_TASK);
             final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
             if (resolveInfo != null) {
                 final ActivityInfo activityInfo = resolveInfo.activityInfo;
                 final String title = activityInfo.loadLabel(pm).toString();
                 Drawable icon = activityInfo.loadIcon(pm);

                 if (title != null && title.length() > 0 && icon != null) {
                     final TextView tv = mIcons[index];
                     tv.setText(title);
                     icon = iconUtilities.createIconDrawable(icon);
                     tv.setCompoundDrawables(null, icon, null, null);
                     RecentTag tag = new RecentTag();
                     tag.info = info;
                     tag.intent = intent;
                     tv.setTag(tag);
                     tv.setVisibility(View.VISIBLE);
                     tv.setPressed(false);
                     tv.clearFocus();
                     ++index;
                 }
             }
         }

         // handle the case of "no icons to show"
         mNoAppsText.setVisibility((index == 0) ? View.VISIBLE : View.GONE);

         // hide the rest
         for (; index < NUM_BUTTONS; ++index) {
             mIcons[index].setVisibility(View.GONE);
         }
     }

     /**
      * This is the listener for the ACTION_CLOSE_SYSTEM_DIALOGS intent.  It's an indication that
      * we should close ourselves immediately, in order to allow a higher-priority UI to take over
      * (e.g. phone call received).
      */
     private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
             if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
                 String reason = intent.getStringExtra(PhoneWindowManager.SYSTEM_DIALOG_REASON_KEY);
                 if (! PhoneWindowManager.SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {
                     dismiss();
                 }
             }
         }
     };
 }
	/*
	* Copyright (C) 2008 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.internal.policy.impl;

	import android.app.ActivityManager;
	import android.app.Dialog;
	import android.app.StatusBarManager;
	import android.content.ActivityNotFoundException;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.content.pm.ActivityInfo;
	import android.content.pm.PackageManager;
	import android.content.pm.ResolveInfo;
	import android.graphics.drawable.Drawable;
	import android.os.Bundle;
	import android.os.Handler;
	import android.util.Log;
	import android.view.KeyEvent;
	import android.view.SoundEffectConstants;
	import android.view.View;
	import android.view.Window;
	import android.view.WindowManager;
	import android.view.View.OnClickListener;
	import android.widget.TextView;

	import java.util.List;

	public class RecentApplicationsDialog extends Dialog implements OnClickListener {
	// Elements for debugging support
	// private static final String LOG_TAG = "RecentApplicationsDialog";
	private static final boolean DBG_FORCE_EMPTY_LIST = false;

	static private StatusBarManager sStatusBar;

	private static final int NUM_BUTTONS = 8;
	private static final int MAX_RECENT_TASKS = NUM_BUTTONS * 2; // allow for some discards

	final TextView[] mIcons = new TextView[NUM_BUTTONS];
	View mNoAppsText;
	IntentFilter mBroadcastIntentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);

	class RecentTag {
	ActivityManager.RecentTaskInfo info;
	Intent intent;
	}

	Handler mHandler = new Handler();
	Runnable mCleanup = new Runnable() {
	public void run() {
	// dump extra memory we're hanging on to
	for (TextView icon: mIcons) {
	icon.setCompoundDrawables(null, null, null, null);
	icon.setTag(null);
	}
	}
	};

	public RecentApplicationsDialog(Context context) {
	super(context, com.android.internal.R.style.Theme_Dialog_RecentApplications);

	}

	/**
	* We create the recent applications dialog just once, and it stays around (hidden)
	* until activated by the user.
	*
	* @see PhoneWindowManager#showRecentAppsDialog
	*/
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	Context context = getContext();

	if (sStatusBar == null) {
	sStatusBar = (StatusBarManager)context.getSystemService(Context.STATUS_BAR_SERVICE);
	}

	Window window = getWindow();
	window.requestFeature(Window.FEATURE_NO_TITLE);
	window.setType(WindowManager.LayoutParams.TYPE_RECENTS_OVERLAY);
	window.setFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
	WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
	window.setTitle("Recents");

	setContentView(com.android.internal.R.layout.recent_apps_dialog);

	final WindowManager.LayoutParams params = window.getAttributes();
	params.width = WindowManager.LayoutParams.MATCH_PARENT;
	params.height = WindowManager.LayoutParams.MATCH_PARENT;
	window.setAttributes(params);
	window.setFlags(0, WindowManager.LayoutParams.FLAG_DIM_BEHIND);

	mIcons[0] = (TextView)findViewById(com.android.internal.R.id.button0);
	mIcons[1] = (TextView)findViewById(com.android.internal.R.id.button1);
	mIcons[2] = (TextView)findViewById(com.android.internal.R.id.button2);
	mIcons[3] = (TextView)findViewById(com.android.internal.R.id.button3);
	mIcons[4] = (TextView)findViewById(com.android.internal.R.id.button4);
	mIcons[5] = (TextView)findViewById(com.android.internal.R.id.button5);
	mIcons[6] = (TextView)findViewById(com.android.internal.R.id.button6);
	mIcons[7] = (TextView)findViewById(com.android.internal.R.id.button7);
	mNoAppsText = findViewById(com.android.internal.R.id.no_applications_message);

	for (TextView b: mIcons) {
	b.setOnClickListener(this);
	}
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
	if (keyCode == KeyEvent.KEYCODE_TAB) {
	// Ignore all meta keys other than SHIFT. The app switch key could be a
	// fallback action chorded with ALT, META or even CTRL depending on the key map.
	// DPad navigation is handled by the ViewRoot elsewhere.
	final boolean backward = event.isShiftPressed();
	final int numIcons = mIcons.length;
	int numButtons = 0;
	while (numButtons < numIcons && mIcons[numButtons].getVisibility() == View.VISIBLE) {
	numButtons += 1;
	}
	if (numButtons != 0) {
	int nextFocus = backward ? numButtons - 1 : 0;
	for (int i = 0; i < numButtons; i++) {
	if (mIcons[i].hasFocus()) {
	if (backward) {
	nextFocus = (i + numButtons - 1) % numButtons;
	} else {
	nextFocus = (i + 1) % numButtons;
	}
	break;
	}
	}
	final int direction = backward ? View.FOCUS_BACKWARD : View.FOCUS_FORWARD;
	if (mIcons[nextFocus].requestFocus(direction)) {
	mIcons[nextFocus].playSoundEffect(
	SoundEffectConstants.getContantForFocusDirection(direction));
	}
	}

	// The dialog always handles the key to prevent the ViewRoot from
	// performing the default navigation itself.
	return true;
	}

	return super.onKeyDown(keyCode, event);
	}

	/**
	* Dismiss the dialog and switch to the selected application.
	*/
	public void dismissAndSwitch() {
	final int numIcons = mIcons.length;
	RecentTag tag = null;
	for (int i = 0; i < numIcons; i++) {
	if (mIcons[i].getVisibility() != View.VISIBLE) {
	break;
	}
	if (i == 0 \|\| mIcons[i].hasFocus()) {
	tag = (RecentTag) mIcons[i].getTag();
	if (mIcons[i].hasFocus()) {
	break;
	}
	}
	}
	if (tag != null) {
	switchTo(tag);
	}
	dismiss();
	}

	/**
	* Handler for user clicks. If a button was clicked, launch the corresponding activity.
	*/
	public void onClick(View v) {
	for (TextView b: mIcons) {
	if (b == v) {
	RecentTag tag = (RecentTag)b.getTag();
	switchTo(tag);
	break;
	}
	}
	dismiss();
	}

	private void switchTo(RecentTag tag) {
	if (tag.info.id >= 0) {
	// This is an active task; it should just go to the foreground.
	final ActivityManager am = (ActivityManager)
	getContext().getSystemService(Context.ACTIVITY_SERVICE);
	am.moveTaskToFront(tag.info.id, ActivityManager.MOVE_TASK_WITH_HOME);
	} else if (tag.intent != null) {
	tag.intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
	\| Intent.FLAG_ACTIVITY_TASK_ON_HOME);
	try {
	getContext().startActivity(tag.intent);
	} catch (ActivityNotFoundException e) {
	Log.w("Recent", "Unable to launch recent task", e);
	}
	}
	}

	/**
	* Set up and show the recent activities dialog.
	*/
	@Override
	public void onStart() {
	super.onStart();
	reloadButtons();
	if (sStatusBar != null) {
	sStatusBar.disable(StatusBarManager.DISABLE_EXPAND);
	}

	// receive broadcasts
	getContext().registerReceiver(mBroadcastReceiver, mBroadcastIntentFilter);

	mHandler.removeCallbacks(mCleanup);
	}

	/**
	* Dismiss the recent activities dialog.
	*/
	@Override
	public void onStop() {
	super.onStop();

	if (sStatusBar != null) {
	sStatusBar.disable(StatusBarManager.DISABLE_NONE);
	}

	// stop receiving broadcasts
	getContext().unregisterReceiver(mBroadcastReceiver);

	mHandler.postDelayed(mCleanup, 100);
	}

	/**
	* Reload the 6 buttons with recent activities
	*/
	private void reloadButtons() {

	final Context context = getContext();
	final PackageManager pm = context.getPackageManager();
	final ActivityManager am = (ActivityManager)
	context.getSystemService(Context.ACTIVITY_SERVICE);
	final List<ActivityManager.RecentTaskInfo> recentTasks =
	am.getRecentTasks(MAX_RECENT_TASKS, ActivityManager.RECENT_IGNORE_UNAVAILABLE);

	ActivityInfo homeInfo =
	new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME)
	.resolveActivityInfo(pm, 0);

	IconUtilities iconUtilities = new IconUtilities(getContext());

	// Performance note: Our android performance guide says to prefer Iterator when
	// using a List class, but because we know that getRecentTasks() always returns
	// an ArrayList<>, we'll use a simple index instead.
	int index = 0;
	int numTasks = recentTasks.size();
	for (int i = 0; i < numTasks && (index < NUM_BUTTONS); ++i) {
	final ActivityManager.RecentTaskInfo info = recentTasks.get(i);

	// for debug purposes only, disallow first result to create empty lists
	if (DBG_FORCE_EMPTY_LIST && (i == 0)) continue;

	Intent intent = new Intent(info.baseIntent);
	if (info.origActivity != null) {
	intent.setComponent(info.origActivity);
	}

	// Skip the current home activity.
	if (homeInfo != null) {
	if (homeInfo.packageName.equals(
	intent.getComponent().getPackageName())
	&& homeInfo.name.equals(
	intent.getComponent().getClassName())) {
	continue;
	}
	}

	intent.setFlags((intent.getFlags()&~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
	\| Intent.FLAG_ACTIVITY_NEW_TASK);
	final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
	if (resolveInfo != null) {
	final ActivityInfo activityInfo = resolveInfo.activityInfo;
	final String title = activityInfo.loadLabel(pm).toString();
	Drawable icon = activityInfo.loadIcon(pm);

	if (title != null && title.length() > 0 && icon != null) {
	final TextView tv = mIcons[index];
	tv.setText(title);
	icon = iconUtilities.createIconDrawable(icon);
	tv.setCompoundDrawables(null, icon, null, null);
	RecentTag tag = new RecentTag();
	tag.info = info;
	tag.intent = intent;
	tv.setTag(tag);
	tv.setVisibility(View.VISIBLE);
	tv.setPressed(false);
	tv.clearFocus();
	++index;
	}
	}
	}

	// handle the case of "no icons to show"
	mNoAppsText.setVisibility((index == 0) ? View.VISIBLE : View.GONE);

	// hide the rest
	for (; index < NUM_BUTTONS; ++index) {
	mIcons[index].setVisibility(View.GONE);
	}
	}

	/**
	* This is the listener for the ACTION_CLOSE_SYSTEM_DIALOGS intent. It's an indication that
	* we should close ourselves immediately, in order to allow a higher-priority UI to take over
	* (e.g. phone call received).
	*/
	private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	String action = intent.getAction();
	if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
	String reason = intent.getStringExtra(PhoneWindowManager.SYSTEM_DIALOG_REASON_KEY);
	if (! PhoneWindowManager.SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {
	dismiss();
	}
	}
	}
	};
	}