My application targets KITKAT and up android version and i am trying to create repetitive notification daily via Alarm Manager below is my code :
public class AlarmReceiver extends BroadcastReceiver {
public static final String MY_ACTION = "mymasterpeice.foreverservice.myaction";
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(MY_ACTION)) {
// Do something here
// For our recurring task, we'll just display a message
Toast.makeText(context, "I'm running", Toast.LENGTH_SHORT).show();
// displayNotification(context, "Checkout New Articles");
sendNotification(context, "Checkout New Articles - Team");
}
}
/**
* Issues a notification to inform the user that server has sent a message.
*/
private static void sendNotification(Context context, String message) {
if (message != null && !TextUtils.isEmpty(message)) {
int icon = R.mipmap.ic_launcher;
long when = System.currentTimeMillis();
NotificationManager notificationManager = (NotificationManager)
context.getSystemService(Context.NOTIFICATION_SERVICE);
String title = context.getString(R.string.app_name);
Intent notificationIntent = new Intent(context, MainActivity.class);
// set intent so it does not start a new activity
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent intent =
PendingIntent.getActivity(context, 0, notificationIntent, 0);
Notification.Builder builder = new Notification.Builder(context);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
Intent.FLAG_ACTIVITY_SINGLE_TOP);
builder.setSmallIcon(icon)
.setContentTitle(title)
.setContentText(message)
.setContentIntent(intent);
Notification notification = builder.getNotification();
notificationManager.notify(icon, notification);
}
}
}
Main Activity :
public class MainActivity extends AppCompatActivity {
private String TAG=MainActivity.class.getSimpleName();
public static final String MY_ACTION = "mymasterpeice.foreverservice.myaction";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRecusrringTimer();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
private void setRecusrringTimer() {
Intent myIntent = new Intent(MY_ACTION);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
this, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
Calendar firingCal = Calendar.getInstance();
Calendar currentCal = Calendar.getInstance();
firingCal.set(Calendar.HOUR, 7); // At the hour you wanna fire
firingCal.set(Calendar.MINUTE, 0); // Particular minute
firingCal.set(Calendar.SECOND, 0); // particular second
long intendedTime = firingCal.getTimeInMillis();
long currentTime = currentCal.getTimeInMillis();
if (intendedTime >= currentTime) // you can add buffer time too here to ignore some small differences in milliseconds
{
alarmManager.setRepeating(AlarmManager.RTC,
intendedTime, AlarmManager.INTERVAL_DAY,
pendingIntent);
Log.d(TAG, "setRecusrringTimer ");
} else {
intendedTime = firingCal.getTimeInMillis();
Log.d(TAG, "setRecusrringTimer ");
alarmManager.setRepeating(AlarmManager.RTC,
intendedTime, AlarmManager.INTERVAL_DAY,
pendingIntent);
}
}
}
Manifest :
<receiver android:name=".AlarmReceiver">
<intent-filter>
<action android:name="mymasterpeice.foreverservice.myaction"/>
</intent-filter>
</receiver>
Issue is This code runs properly on Kitkat device until app is in memory , there are some delays like as in doc specified :
Note: Beginning with API 19 (KITKAT) alarm delivery is inexact: the OS will shift alarms in order to minimize wakeups and battery use. There are new APIs to support applications which need strict delivery guarantees; see setWindow(int, long, long, PendingIntent) and setExact(int, long, PendingIntent). Applications whose targetSdkVersion is earlier than API 19 will continue to see the previous behavior in which all alarms are delivered exactly when requested.
But When app is not in memory the alarm manager does not show notification . I am specifically targeting Kitkat and above version of android.
