/*
* 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.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
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.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 = 6;
private static final int MAX_RECENT_TASKS = NUM_BUTTONS * 2; // allow for some discards
final View[] mButtons = new View[NUM_BUTTONS];
View mNoAppsText;
IntentFilter mBroadcastIntentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
private int mIconSize;
public RecentApplicationsDialog(Context context) {
super(context, com.android.internal.R.style.Theme_Dialog_RecentApplications);
final Resources resources = context.getResources();
mIconSize = (int) resources.getDimension(android.R.dimen.app_icon_size);
}
/**
* 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 theWindow = getWindow();
theWindow.requestFeature(Window.FEATURE_NO_TITLE);
theWindow.setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
theWindow.setFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND,
WindowManager.LayoutParams.FLAG_DIM_BEHIND);
theWindow.setFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
theWindow.setTitle("Recents");
setContentView(com.android.internal.R.layout.recent_apps_dialog);
mButtons[0] = findViewById(com.android.internal.R.id.button1);
mButtons[1] = findViewById(com.android.internal.R.id.button2);
mButtons[2] = findViewById(com.android.internal.R.id.button3);
mButtons[3] = findViewById(com.android.internal.R.id.button4);
mButtons[4] = findViewById(com.android.internal.R.id.button5);
mButtons[5] = findViewById(com.android.internal.R.id.button6);
mNoAppsText = findViewById(com.android.internal.R.id.no_applications_message);
for (View b : mButtons) {
b.setOnClickListener(this);
}
}
/**
* Handler for user clicks. If a button was clicked, launch the corresponding activity.
*/
public void onClick(View v) {
for (View b : mButtons) {
if (b == v) {
// prepare a launch intent and send it
Intent intent = (Intent)b.getTag();
intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);
getContext().startActivity(intent);
}
}
dismiss();
}
/**
* 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);
}
/**
* Dismiss the recent activities dialog.
*/
@Override
public void onStop() {
super.onStop();
// dump extra memory we're hanging on to
for (View b : mButtons) {
setButtonAppearance(b, null, null);
b.setTag(null);
}
if (sStatusBar != null) {
sStatusBar.disable(StatusBarManager.DISABLE_NONE);
}
// stop receiving broadcasts
getContext().unregisterReceiver(mBroadcastReceiver);
}
/**
* 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, 0);
ResolveInfo homeInfo = pm.resolveActivity(
new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME),
0);
// 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 button = 0;
int numTasks = recentTasks.size();
for (int i = 0; i < numTasks && (button < 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.activityInfo.packageName.equals(
intent.getComponent().getPackageName())
&& homeInfo.activityInfo.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();
final Drawable icon = activityInfo.loadIcon(pm);
if (title != null && title.length() > 0 && icon != null) {
final View b = mButtons[button];
setButtonAppearance(b, title, icon);
b.setTag(intent);
b.setVisibility(View.VISIBLE);
b.setPressed(false);
b.clearFocus();
++button;
}
}
}
// handle the case of "no icons to show"
mNoAppsText.setVisibility((button == 0) ? View.VISIBLE : View.GONE);
// hide the rest
for ( ; button < NUM_BUTTONS; ++button) {
mButtons[button].setVisibility(View.GONE);
}
}
/**
* Adjust appearance of each icon-button
*/
private void setButtonAppearance(View theButton, final String theTitle, final Drawable icon) {
TextView tv = (TextView) theButton;
tv.setText(theTitle);
if (icon != null) {
icon.setBounds(0, 0, mIconSize, mIconSize);
}
tv.setCompoundDrawables(null, icon, null, null);
}
/**
* 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();
}
}
}
};
}