Java tutorial
/* Copyright 2013-2014 appPlant UG Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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 de.appplant.cordova.plugin.background; import java.util.Timer; import java.util.TimerTask; import org.json.JSONObject; import android.annotation.SuppressLint; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; import android.content.Context; import android.content.Intent; import android.content.res.Resources; import android.graphics.Color; import android.os.Binder; import android.os.Build; import android.os.Handler; import android.os.IBinder; import android.util.Log; /** * Puts the service in a foreground state, where the system considers it to be * something the user is actively aware of and thus not a candidate for killing * when low on memory. */ public class ForegroundService extends Service { // Fixed ID for the 'foreground' notification private static final int NOTIFICATION_ID = -574543954; private Notification.Builder notification; // Binder given to clients private final IBinder mBinder = new ForegroundBinder(); // Scheduler to exec periodic tasks final Timer scheduler = new Timer(); // Used to keep the app alive TimerTask keepAliveTask; /** * Allow clients to call on to the service. */ @Override public IBinder onBind(Intent intent) { return mBinder; } /** * Class used for the client Binder. Because we know this service always * runs in the same process as its clients, we don't need to deal with IPC. */ public class ForegroundBinder extends Binder { ForegroundService getService() { // Return this instance of ForegroundService so clients can call public methods return ForegroundService.this; } } /** * Put the service in a foreground state to prevent app from being killed * by the OS. */ @Override public void onCreate() { super.onCreate(); keepAwake(); } @Override public void onDestroy() { super.onDestroy(); sleepWell(); } /** * Put the service in a foreground state to prevent app from being killed * by the OS. */ public void keepAwake() { final Handler handler = new Handler(); if (!this.inSilentMode()) { startForeground(NOTIFICATION_ID, makeNotification()); } else { Log.w("BackgroundMode", "In silent mode app may be paused by OS!"); } BackgroundMode.deleteUpdateSettings(); keepAliveTask = new TimerTask() { @Override public void run() { handler.post(new Runnable() { @Override public void run() { // Nothing to do here // Log.d("BackgroundMode", "" + new Date().getTime()); } }); } }; scheduler.schedule(keepAliveTask, 0, 1000); } /** * Stop background mode. */ private void sleepWell() { stopForeground(true); keepAliveTask.cancel(); } /** * Create a notification as the visible part to be able to put the service * in a foreground state. * * @return * A local ongoing notification which pending intent is bound to the * main activity. */ @SuppressLint("NewApi") @SuppressWarnings("deprecation") private Notification makeNotification() { JSONObject settings = BackgroundMode.getSettings(); Context context = getApplicationContext(); String pkgName = context.getPackageName(); Intent intent = context.getPackageManager().getLaunchIntentForPackage(pkgName); notification = new Notification.Builder(context).setContentTitle(settings.optString("title", "")) .setContentText(settings.optString("text", "")).setTicker(settings.optString("ticker", "")) .setOngoing(true).setSmallIcon(getIconResId()); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { if (settings.optBoolean("isPublic") == true) { notification.setVisibility(Notification.VISIBILITY_PUBLIC); } if (!settings.optString("color").equals("")) { try { notification.setColor(Color.parseColor(settings.optString("color"))); } catch (Exception e) { Log.e("BackgroundMode", settings.optString("color") + " is not a valid color"); } } } if (intent != null && settings.optBoolean("resume")) { PendingIntent contentIntent = PendingIntent.getActivity(context, NOTIFICATION_ID, intent, PendingIntent.FLAG_UPDATE_CURRENT); notification.setContentIntent(contentIntent); } if (Build.VERSION.SDK_INT < 16) { // Build notification for HoneyComb to ICS return notification.getNotification(); } else { // Notification for Jellybean and above return notification.build(); } } public void updateNotification() { Notification n = makeNotification(); NotificationManager mNotificationManager = (NotificationManager) getSystemService( Context.NOTIFICATION_SERVICE); mNotificationManager.notify(NOTIFICATION_ID, n); } /** * Retrieves the resource ID of the app icon. * * @return * The resource ID of the app icon */ private int getIconResId() { JSONObject settings = BackgroundMode.getSettings(); Context context = getApplicationContext(); Resources res = context.getResources(); String pkgName = context.getPackageName(); int resId = res.getIdentifier(settings.optString("icon", "icon"), "drawable", pkgName); return resId; } /** * In silent mode no notification has to be added. * * @return * True if silent: was set to true */ private boolean inSilentMode() { JSONObject settings = BackgroundMode.getSettings(); return settings.optBoolean("silent", false); } }