Want to write a code to only send notification at certain time, but somehow the alarmManager is not working and it shows some errors

Question

Not sending notification at selected time, when I ran my code, directly showed notification and showed error as well Here is the error message: E/NotificationManager: notifyAsUser: tag=null, id=12345, user=UserHandle{0} I thought the error message was due to Build.VERSION.SDK_INT, but after adding that, the error message is still there.

Place all of these under onCreate:

 Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 13);
        calendar.set(Calendar.MINUTE,9)

;

    Intent intent = new Intent ();
    intent.setAction("com.example.Broadcast");

    PendingIntent contentIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

// PendingIntent alarmIntent = PendingIntent.getBroadcast(this,0, intent,0);

    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, contentIntent);

and here is the extend.

public class wakeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    setNotification(context);


}


protected void setNotification(Context context){

    PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
            new Intent(context, MainActivity.class), 0);

    String ChannelId = "12345";
    int uniID = 12345;

    NotificationCompat.Builder builder = new NotificationCompat.Builder(context,ChannelId )
            .setSmallIcon(R.mipmap.ic_launcher_round)
            .setContentTitle("Hi")
            .setAutoCancel(true)
            .setWhen(System.currentTimeMillis())
            .setContentText("Please Rate.");


    builder.setContentIntent(contentIntent);

// // Send notification to your device NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        builder.setChannelId("com.myApp");
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel(
                "com.myApp",
                "My App",
                NotificationManager.IMPORTANCE_DEFAULT
        );
        if (manager != null) {
            manager.createNotificationChannel(channel);
        }
    }
    manager.notify(uniID, builder.build());

}

}

Can someone please help me with this?

Please add the full exception text with stack trace to your question. — David Wasser

David Wasser David Wasser · Accepted Answer · 2019-03-27T14:06:48

You are very confused.

In your code you call NotificationManager.notify(). This will show the Notification immediately.

You do:

Intent intent = new Intent(this, MainActivity.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(this,0, intent,0);

This won't work. You have created a PendingIntent which will be sent via broadcast using an Intent that is for an Activity! What do you want to happen? Do you want an Activity to be launched or do you want a BroadcastReceiver to be triggered?

I think what you want to do is as follows:

Create an Intent for a BroadcastReceiver, wrap that in a PendingIntent using getBroadcast() and pass that to the AlarmManager so that the broadcast Intent will be set at some future time.
Create a class that extends BroadcastReceiver. In onReceive() create the Notification and call NotificationManager.notify() to post the Notification. In the Notification you can set a PendingIntent that opens your Activity so that if the user clicks on the Notification your Activity will be launched. To do this, call PendingIntent.getActivity() and pass an Intent that contains MainActivity.class.

Want to write a code to only send notification at certain time, but somehow the alarmManager is not working and it shows some errors

1 Answers