Develop Reference

AlarmManager alarm goes off immediately and ignores delay

I'm trying to do a simple Alarm manager, and although I'm adding a delay of 5 second,
the alarm in my phone goes off immediately.
I'm aware that in my receiver the alarm says to go off now,
but I understood that you set the delay to when you want it to go off at the pending intent.
what am I doing wrong ?
here is my alarm intent:
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent (AlarmClockScreen.this, AlarmNotificationReciever.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, intent, 0);
manager.set(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime()+5000,pendingIntent);
and here is my Receiver
public class AlarmNotificationReciever extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
builder.setAutoCancel(true)
.setDefaults(Notification.DEFAULT_ALL)
.setWhen(System.currentTimeMillis())
.setSmallIcon(android.R.mipmap.sym_def_app_icon)
.setContentTitle("Alarm TITLE")
.setContentText("I will finish, What you started")
.setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND)
.setContentInfo("Info");
NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1,builder.build());
}
}

fixed it by adding
Calendar time = Calendar.getInstance();
time.setTimeInMillis(System.currentTimeMillis());
time.add(Calendar.SECOND, 30);
and then using time.getTimeInMillis()

Service code not running after application swiped from recent apps

Hi i am using IntentService to show notifications to user based on their time set which is stored in notificationCalendar variable. I start service using AlarmManager and when app is in background(Pressed home button) or running i receive notification but when app is swiped from recent apps no notification is received.
I searched for solutions online for not allowing service to destroy so i return START_STICKY in service onStartCaommand and in manifest i have added stopWithTask=false.
I am testing it on MI phone with API level 22.
Here's my code:
private void sendNotification(){
Intent intent = new Intent(this, NotificationService.class);
PendingIntent alarmIntent = PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, notificationCalendar.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, alarmIntent);
}
Service class to show notifications:
public class NotificationService extends Service {
private static final int NOTIFICATION_ID = 1;
public NotificationService() {
super();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
processStartNotification();
return START_STICKY;
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
private void processStartNotification() {
// Do something. For example, fetch fresh data from backend to create a rich notification?
NotificationManager notificationManager = (NotificationManager) this
.getSystemService(Context.NOTIFICATION_SERVICE);
Intent notificationIntent = new Intent(this, MainActivity.class);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder mNotifyBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("Habit Time")
.setContentText("Hey time for your habit")
.setAutoCancel(true)
.setContentIntent(pendingIntent)
.setSound(alarmSound)
.setVibrate(new long[]{1000, 1000, 1000, 1000, 1000});
notificationManager.notify(NOTIFICATION_ID, mNotifyBuilder.build());
}
#Override
public void onTaskRemoved(Intent rootIntent){
Intent restartServiceIntent = new Intent(getApplicationContext(), this.getClass());
restartServiceIntent.setPackage(getPackageName());
PendingIntent restartServicePendingIntent = PendingIntent.getService(getApplicationContext(), 1, restartServiceIntent, PendingIntent.FLAG_ONE_SHOT);
AlarmManager alarmService = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
alarmService.set(
AlarmManager.ELAPSED_REALTIME,
SystemClock.elapsedRealtime() + 1,
restartServicePendingIntent);
super.onTaskRemoved(rootIntent);
}
}
//Manifest file
<service
android:name=".notification.NotificationService"
android:enabled="true"
android:stopWithTask="false"/>

On some phones, you need to add your app to the list of apps allowed to run in the background. Some Huawei, LG and Xiaomi phones have this. If your app is not in this list, swiping the task from the list of recent tasks will kill any background processes and not restart them.
Look in Settings->Battery->Manage Apps Battery Usage

How to send a Notification at a specific time?

I would like to send a notification at a specific time. Below is my code. Right now, I only get a notification when I start the app, but I do not get a notification at the specified time. Could you help me understand what I am doing wrong.
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("My notification")
.setContentText("Trainieren sie jetzt!")
.setAutoCancel(true);
Intent resultIntent = new Intent(this, MainActivity2.class);
AlarmManager alarmManager =(AlarmManager)getSystemService(ALARM_SERVICE);
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 12);
cal.set(Calendar.MINUTE, 54);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 24*60*60*1000, resultPendingIntent);
mBuilder.setContentIntent(resultPendingIntent);
int mNotificationId = 001;
NotificationManager mNotifyMgr =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotifyMgr.notify(mNotificationId, mBuilder.build());
Thanks for helping!

You need to add:
#Override
public void onReceive(Context context, Intent intent) {
// Toast.makeText(MainActivity.con, "Hello from alarm", 1).show();
// System.out.println("Hello from Alarm");
context.startService(new Intent(context, NotificationService.class));
}
In the above example I am directing the process to my Service class to process my notification, managing wake locks and background service implementation. If you are not implementing a Service you can just display your notifications in the onRecieve method.
Please have a look here it has a complete implementation of the Alarm Class.

Alarm Manager showing abnormality

I have set an Alarm Manager which will show Notification 10 seconds after app will be destroyed.
But it's not working.
Here's my onDestroy() code:
#Override
public void onDestroy() {
super.onDestroy();
Intent myIntent = new Intent(this, alarmManager.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, myIntent,0);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
//alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 10*1000, 10*1000, pendingIntent);
alarmManager.cancel(pendingIntent);
}
and here is alarmManager.class:
public class alarmManager extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Intent service1 = new Intent(context, Notification.class);
context.startService(service1);
}
}
and here is Notification.class:
public class Notification extends Service {
#Override
public void onCreate() {
super.onCreate();
Intent mainIntent = new Intent(this, Main.class);
NotificationManager notificationManager
= (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
android.app.Notification noti = new NotificationCompat.Builder(this)
.setAutoCancel(true)
.setContentIntent(PendingIntent.getActivity(this, 0, mainIntent,
PendingIntent.FLAG_UPDATE_CURRENT))
.setContentTitle("Title")
.setContentText("It's been so Long!!!")
.setSubText("Please return back to App")
.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
.setVibrate(new long[] {1000,1000,1000,1000})
.setSmallIcon(R.drawable.ic_launcher)
.setTicker("Important Notification")
.setWhen(System.currentTimeMillis())
.build();
notificationManager.notify(0, noti);
}
*I've been working on this since many days, but I am unable to get through it.
Any Help would be highly* appreciated.
Thanks in advance.

There are some relatively minor changes to make, but overall you've got the necessary code.
You don't need a Service for this. Move the code to create the Notification to the BroadcastReceiver, and replace this with context everywhere.
Make sure your BroadcastReceiver is listed in the manifest.
Don't use setRepeating() for the alarm; use set(). You only need it to fire once.
Remove the following line: alarmManager.cancel(pendingIntent);
Those are the changes necessary to get it working. However, you might also consider removing the sound and vibration from the Notification, and treat it more like a status message. It would also be preferable to rename your BroadcastReceiver class. Perhaps something like AlarmReceiver, to be in keeping with Java class naming conventions, and to avoid confusion with the AlarmManager class.

Notification sent to user at a specific time Android

I'm trying to send a notification to a user at a specific time using an Alarm Manager. Basically, nothing happens at all and to me the code looks fine. My code for the Alarm Manager is below:
/** Notify the user when they have a task */
public void notifyAtTime() {
Intent myIntent = new Intent(PlanActivity.this , Notification.class);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
PendingIntent pendingIntent = PendingIntent.getService(PlanActivity.this, 0, myIntent, 0);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 12);
calendar.set(Calendar.MINUTE, 17);
calendar.set(Calendar.SECOND, 00);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 24*60*60*1000 , pendingIntent);
}
The code for the notification, which is in the "Notification" class is below:
public class Notification extends Service {
#Override
public void onCreate() {
Toast.makeText(this, "Notification", Toast.LENGTH_LONG).show();
Intent intent = new Intent(this,PlanActivity.class);
PendingIntent pending = PendingIntent.getActivity(this, 0, intent, 0);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
this).setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Football")
.setContentText("Don't forget that you have Football planned!")
.setContentIntent(pending);
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.notify(0, mBuilder.build());
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
The Toast which is set in the Notification class also doesn't come up. I don't know if it's something really silly that I'm missing but any help would be greatly appreciated! :)

This is your receiver class :
public class OnetimeAlarmReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
//Toast.makeText(context, "Repeating Alarm worked.", Toast.LENGTH_LONG).show();
// try here
// prepare intent which is triggered if the
// notification is selected
Intent intent = new Intent(this, NotificationReceiver.class);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent, 0);
// build notification
// the addAction re-use the same intent to keep the example short
Notification n = new Notification.Builder(this)
.setContentTitle("New mail from " + "test#gmail.com")
.setContentText("Subject")
.setSmallIcon(R.drawable.icon)
.setContentIntent(pIntent)
.setAutoCancel(true)
.addAction(R.drawable.icon, "Call", pIntent)
.addAction(R.drawable.icon, "More", pIntent)
.addAction(R.drawable.icon, "And more", pIntent).build();
NotificationManager notificationManager =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(0, n);
}
}
In Second Activity to set Alerm :
private void setAlarm(){
Intent intent = new Intent(this, OnetimeAlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, REQUEST_CODE, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + alarm_time , pendingIntent);
System.out.println("Time Total ----- "+(System.currentTimeMillis()+total_mili));
}
I would like to recommend this tutorial How to send notification

Try to put your notification code in the onStartCommand function instead of onCreate.

Writing the alarmmanager code in the onCreate method of the LAUNCHER activity of the app solved my problem