257 lines
9.3 KiB
Java
257 lines
9.3 KiB
Java
/*
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* Copyright (C) 2008 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 com.android.internal.policy.impl;
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import android.app.ActivityManager;
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import android.app.Dialog;
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import android.app.StatusBarManager;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.content.res.Resources;
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import android.content.pm.ActivityInfo;
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import android.content.pm.PackageManager;
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import android.content.pm.ResolveInfo;
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import android.graphics.drawable.Drawable;
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import android.os.Bundle;
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import android.view.View;
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import android.view.Window;
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import android.view.WindowManager;
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import android.view.View.OnClickListener;
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import android.widget.TextView;
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import java.util.List;
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public class RecentApplicationsDialog extends Dialog implements OnClickListener {
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// Elements for debugging support
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// private static final String LOG_TAG = "RecentApplicationsDialog";
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private static final boolean DBG_FORCE_EMPTY_LIST = false;
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static private StatusBarManager sStatusBar;
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private static final int NUM_BUTTONS = 6;
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private static final int MAX_RECENT_TASKS = NUM_BUTTONS * 2; // allow for some discards
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final View[] mButtons = new View[NUM_BUTTONS];
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View mNoAppsText;
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IntentFilter mBroadcastIntentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
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private int mIconSize;
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public RecentApplicationsDialog(Context context) {
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super(context, com.android.internal.R.style.Theme_Dialog_RecentApplications);
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final Resources resources = context.getResources();
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mIconSize = (int) resources.getDimension(android.R.dimen.app_icon_size);
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}
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/**
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* We create the recent applications dialog just once, and it stays around (hidden)
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* until activated by the user.
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*
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* @see PhoneWindowManager#showRecentAppsDialog
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*/
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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Context context = getContext();
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if (sStatusBar == null) {
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sStatusBar = (StatusBarManager)context.getSystemService(Context.STATUS_BAR_SERVICE);
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}
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Window theWindow = getWindow();
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theWindow.requestFeature(Window.FEATURE_NO_TITLE);
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theWindow.setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
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theWindow.setFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND,
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WindowManager.LayoutParams.FLAG_DIM_BEHIND);
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theWindow.setFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
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WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
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theWindow.setTitle("Recents");
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setContentView(com.android.internal.R.layout.recent_apps_dialog);
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mButtons[0] = findViewById(com.android.internal.R.id.button1);
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mButtons[1] = findViewById(com.android.internal.R.id.button2);
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mButtons[2] = findViewById(com.android.internal.R.id.button3);
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mButtons[3] = findViewById(com.android.internal.R.id.button4);
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mButtons[4] = findViewById(com.android.internal.R.id.button5);
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mButtons[5] = findViewById(com.android.internal.R.id.button6);
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mNoAppsText = findViewById(com.android.internal.R.id.no_applications_message);
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for (View b : mButtons) {
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b.setOnClickListener(this);
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}
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}
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/**
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* Handler for user clicks. If a button was clicked, launch the corresponding activity.
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*/
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public void onClick(View v) {
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for (View b : mButtons) {
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if (b == v) {
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// prepare a launch intent and send it
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Intent intent = (Intent)b.getTag();
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intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);
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getContext().startActivity(intent);
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}
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}
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dismiss();
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}
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/**
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* Set up and show the recent activities dialog.
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*/
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@Override
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public void onStart() {
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super.onStart();
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reloadButtons();
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if (sStatusBar != null) {
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sStatusBar.disable(StatusBarManager.DISABLE_EXPAND);
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}
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// receive broadcasts
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getContext().registerReceiver(mBroadcastReceiver, mBroadcastIntentFilter);
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}
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/**
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* Dismiss the recent activities dialog.
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*/
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@Override
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public void onStop() {
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super.onStop();
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// dump extra memory we're hanging on to
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for (View b : mButtons) {
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setButtonAppearance(b, null, null);
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b.setTag(null);
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}
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if (sStatusBar != null) {
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sStatusBar.disable(StatusBarManager.DISABLE_NONE);
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}
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// stop receiving broadcasts
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getContext().unregisterReceiver(mBroadcastReceiver);
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}
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/**
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* Reload the 6 buttons with recent activities
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*/
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private void reloadButtons() {
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final Context context = getContext();
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final PackageManager pm = context.getPackageManager();
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final ActivityManager am = (ActivityManager)
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context.getSystemService(Context.ACTIVITY_SERVICE);
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final List<ActivityManager.RecentTaskInfo> recentTasks =
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am.getRecentTasks(MAX_RECENT_TASKS, 0);
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ResolveInfo homeInfo = pm.resolveActivity(
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new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME),
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0);
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// Performance note: Our android performance guide says to prefer Iterator when
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// using a List class, but because we know that getRecentTasks() always returns
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// an ArrayList<>, we'll use a simple index instead.
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int button = 0;
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int numTasks = recentTasks.size();
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for (int i = 0; i < numTasks && (button < NUM_BUTTONS); ++i) {
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final ActivityManager.RecentTaskInfo info = recentTasks.get(i);
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// for debug purposes only, disallow first result to create empty lists
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if (DBG_FORCE_EMPTY_LIST && (i == 0)) continue;
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Intent intent = new Intent(info.baseIntent);
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if (info.origActivity != null) {
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intent.setComponent(info.origActivity);
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}
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// Skip the current home activity.
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if (homeInfo != null) {
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if (homeInfo.activityInfo.packageName.equals(
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intent.getComponent().getPackageName())
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&& homeInfo.activityInfo.name.equals(
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intent.getComponent().getClassName())) {
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continue;
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}
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}
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intent.setFlags((intent.getFlags()&~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
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| Intent.FLAG_ACTIVITY_NEW_TASK);
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final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
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if (resolveInfo != null) {
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final ActivityInfo activityInfo = resolveInfo.activityInfo;
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final String title = activityInfo.loadLabel(pm).toString();
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final Drawable icon = activityInfo.loadIcon(pm);
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if (title != null && title.length() > 0 && icon != null) {
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final View b = mButtons[button];
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setButtonAppearance(b, title, icon);
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b.setTag(intent);
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b.setVisibility(View.VISIBLE);
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b.setPressed(false);
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b.clearFocus();
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++button;
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}
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}
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}
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// handle the case of "no icons to show"
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mNoAppsText.setVisibility((button == 0) ? View.VISIBLE : View.GONE);
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// hide the rest
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for ( ; button < NUM_BUTTONS; ++button) {
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mButtons[button].setVisibility(View.GONE);
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}
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}
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/**
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* Adjust appearance of each icon-button
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*/
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private void setButtonAppearance(View theButton, final String theTitle, final Drawable icon) {
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TextView tv = (TextView) theButton;
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tv.setText(theTitle);
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if (icon != null) {
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icon.setBounds(0, 0, mIconSize, mIconSize);
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}
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tv.setCompoundDrawables(null, icon, null, null);
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}
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/**
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* This is the listener for the ACTION_CLOSE_SYSTEM_DIALOGS intent. It's an indication that
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* we should close ourselves immediately, in order to allow a higher-priority UI to take over
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* (e.g. phone call received).
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*/
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private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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String action = intent.getAction();
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if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
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String reason = intent.getStringExtra(PhoneWindowManager.SYSTEM_DIALOG_REASON_KEY);
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if (! PhoneWindowManager.SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {
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dismiss();
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}
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}
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}
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};
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}
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