/*
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* Copyright (C) 2017 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.server.wm;
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import static android.app.NotificationManager.IMPORTANCE_MIN;
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import static android.app.PendingIntent.FLAG_CANCEL_CURRENT;
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import static android.content.Context.NOTIFICATION_SERVICE;
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import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
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import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
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import static android.provider.Settings.ACTION_MANAGE_OVERLAY_PERMISSION;
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import android.app.Notification;
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import android.app.NotificationChannel;
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import android.app.NotificationChannelGroup;
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import android.app.NotificationManager;
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import android.app.PendingIntent;
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import android.content.Context;
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import android.content.Intent;
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import android.content.pm.ApplicationInfo;
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import android.content.pm.PackageManager;
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import android.graphics.Bitmap;
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import android.graphics.drawable.Drawable;
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import android.net.Uri;
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import android.os.Bundle;
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import com.android.internal.R;
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import com.android.server.policy.IconUtilities;
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/** Displays an ongoing notification for a process displaying an alert window */
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class AlertWindowNotification {
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private static final String CHANNEL_PREFIX = "com.android.server.wm.AlertWindowNotification - ";
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private static final int NOTIFICATION_ID = 0;
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private static int sNextRequestCode = 0;
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private static NotificationChannelGroup sChannelGroup;
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private final int mRequestCode;
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private final WindowManagerService mService;
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private String mNotificationTag;
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private final NotificationManager mNotificationManager;
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private final String mPackageName;
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private boolean mPosted;
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private IconUtilities mIconUtilities;
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AlertWindowNotification(WindowManagerService service, String packageName) {
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mService = service;
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mPackageName = packageName;
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mNotificationManager =
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(NotificationManager) mService.mContext.getSystemService(NOTIFICATION_SERVICE);
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mNotificationTag = CHANNEL_PREFIX + mPackageName;
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mRequestCode = sNextRequestCode++;
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mIconUtilities = new IconUtilities(mService.mContext);
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}
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void post() {
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// We can't create/post the notification while the window manager lock is held since it will
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// end up calling into activity manager. So, we post a message to do it later.
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mService.mH.post(this::onPostNotification);
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}
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/** Cancels the notification */
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void cancel(boolean deleteChannel) {
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// We can't call into NotificationManager with WM lock held since it might call into AM.
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// So, we post a message to do it later.
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mService.mH.post(() -> onCancelNotification(deleteChannel));
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}
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/** Don't call with the window manager lock held! */
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private void onCancelNotification(boolean deleteChannel) {
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if (!mPosted) {
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// Notification isn't currently posted...
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return;
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}
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mPosted = false;
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mNotificationManager.cancel(mNotificationTag, NOTIFICATION_ID);
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if (deleteChannel) {
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mNotificationManager.deleteNotificationChannel(mNotificationTag);
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}
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}
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/** Don't call with the window manager lock held! */
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private void onPostNotification() {
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if (mPosted) {
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// Notification already posted...
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return;
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}
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mPosted = true;
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final Context context = mService.mContext;
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final PackageManager pm = context.getPackageManager();
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final ApplicationInfo aInfo = getApplicationInfo(pm, mPackageName);
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final String appName = (aInfo != null)
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? pm.getApplicationLabel(aInfo).toString() : mPackageName;
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createNotificationChannel(context, appName);
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final String message = context.getString(R.string.alert_windows_notification_message,
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appName);
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Bundle extras = new Bundle();
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extras.putStringArray(Notification.EXTRA_FOREGROUND_APPS, new String[] {mPackageName});
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final Notification.Builder builder = new Notification.Builder(context, mNotificationTag)
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.setOngoing(true)
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.setContentTitle(
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context.getString(R.string.alert_windows_notification_title, appName))
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.setContentText(message)
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.setSmallIcon(R.drawable.alert_window_layer)
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.setColor(context.getColor(R.color.system_notification_accent_color))
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.setStyle(new Notification.BigTextStyle().bigText(message))
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.setLocalOnly(true)
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.addExtras(extras)
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.setContentIntent(getContentIntent(context, mPackageName));
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if (aInfo != null) {
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final Drawable drawable = pm.getApplicationIcon(aInfo);
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if (drawable != null) {
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final Bitmap bitmap = mIconUtilities.createIconBitmap(drawable);
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builder.setLargeIcon(bitmap);
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}
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}
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mNotificationManager.notify(mNotificationTag, NOTIFICATION_ID, builder.build());
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}
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private PendingIntent getContentIntent(Context context, String packageName) {
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final Intent intent = new Intent(ACTION_MANAGE_OVERLAY_PERMISSION,
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Uri.fromParts("package", packageName, null));
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intent.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK);
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// Calls into activity manager...
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return PendingIntent.getActivity(context, mRequestCode, intent, FLAG_CANCEL_CURRENT);
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}
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private void createNotificationChannel(Context context, String appName) {
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if (sChannelGroup == null) {
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sChannelGroup = new NotificationChannelGroup(CHANNEL_PREFIX,
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mService.mContext.getString(
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R.string.alert_windows_notification_channel_group_name));
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mNotificationManager.createNotificationChannelGroup(sChannelGroup);
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}
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final String nameChannel =
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context.getString(R.string.alert_windows_notification_channel_name, appName);
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NotificationChannel channel = mNotificationManager.getNotificationChannel(mNotificationTag);
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if (channel != null) {
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return;
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}
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channel = new NotificationChannel(mNotificationTag, nameChannel, IMPORTANCE_MIN);
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channel.enableLights(false);
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channel.enableVibration(false);
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channel.setBlockableSystem(true);
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channel.setGroup(sChannelGroup.getId());
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channel.setBypassDnd(true);
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mNotificationManager.createNotificationChannel(channel);
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}
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private ApplicationInfo getApplicationInfo(PackageManager pm, String packageName) {
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try {
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return pm.getApplicationInfo(packageName, 0);
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} catch (PackageManager.NameNotFoundException e) {
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return null;
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}
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}
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}
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