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POAndroid - Push Notification by battery percentage without launching the app
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copied!<p>I am trying to build a function that takes pushes notification based on the battery percentage. </p> <p>Scenario 1: The battery percentage dropped in between a range of 30% to 40% and the notification will pops out in the notification bar with some message, telling them (by notification) the user is low on battery charge.</p> <p>I have tried to do a service but to no avail. I was able to get BroadcastReceiver to retrieve the battery percentage and pops up the notification but i just can't get the service to work out.</p> <p>I got two classes, MainActivity and BatteryService</p> <p>This is what i put in my BatteryService class</p> <pre><code>public class BatteryService extends Service { int level; public BroadcastReceiver BatInfoReceiver = new BroadcastReceiver() { @Override public void onReceive(Context arg0, Intent intent) { level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); if (level == 50) { // Notify the user with notification } } }; public void onCreate() { super.onCreate(); this.registerReceiver(this.BatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Toast.makeText(getApplicationContext(), "Command=" + level + "%", Toast.LENGTH_LONG).show(); stopSelf(); return START_STICKY; } @Override public void onDestroy() { super.onDestroy(); unregisterReceiver(BatInfoReceiver); } @Override public IBinder onBind(Intent arg0) { // TODO Auto-generated method stub return null; } </code></pre> <p>I got errors like</p> <pre><code>07-29 03:08:49.447: E/AndroidRuntime(1204): FATAL EXCEPTION: main 07-29 03:08:49.447: E/AndroidRuntime(1204): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.BATTERY_CHANGED flg=0x60000010 (has extras) } in app.bayer.notificationbattery.BatteryService$1@414bc4d8 07-29 03:08:49.447: E/AndroidRuntime(1204): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:765) 07-29 03:08:49.447: E/AndroidRuntime(1204): at android.os.Handler.handleCallback(Handler.java:615) 07-29 03:08:49.447: E/AndroidRuntime(1204): at android.os.Handler.dispatchMessage(Handler.java:92) 07-29 03:08:49.447: E/AndroidRuntime(1204): at android.os.Looper.loop(Looper.java:137) 07-29 03:08:49.447: E/AndroidRuntime(1204): at android.app.ActivityThread.main(ActivityThread.java:4745) 07-29 03:08:49.447: E/AndroidRuntime(1204): at java.lang.reflect.Method.invokeNative(Native Method) 07-29 03:08:49.447: E/AndroidRuntime(1204): at java.lang.reflect.Method.invoke(Method.java:511) 07-29 03:08:49.447: E/AndroidRuntime(1204): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 07-29 03:08:49.447: E/AndroidRuntime(1204): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 07-29 03:08:49.447: E/AndroidRuntime(1204): at dalvik.system.NativeStart.main(Native Method) 07-29 03:08:49.447: E/AndroidRuntime(1204): Caused by: java.lang.NullPointerException 07-29 03:08:49.447: E/AndroidRuntime(1204): at app.bayer.notificationbattery.BatteryService$1.onReceive(BatteryService.java:25) 07-29 03:08:49.447: E/AndroidRuntime(1204): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:755) 07-29 03:08:49.447: E/AndroidRuntime(1204): ... 9 more </code></pre> <p>Am i doing my service or broadcastReceiver wrongly?</p> <p>EDIT: The method i placed in MainActivity to make the notification.</p> <pre><code>public void buildNotification(Context context){ NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE); Notification.Builder builder = new Notification.Builder(context); Intent intent = new Intent(context, MainActivity.class); PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0); builder .setSmallIcon(R.drawable.boostninja) .setContentTitle("Berocca Performance") .setContentText("Locate our store to charge your phone") .setTicker("Berocca Performance") .setLights(0xFFFF0000, 500, 500) //setLights (int argb, int onMs, int offMs) .setContentIntent(pendingIntent) .setAutoCancel(true); Notification notification = builder.build(); notificationManager.notify(R.drawable.ic_launcher, notification); } </code></pre>

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