@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void PushNotification()
{
NotificationManager nm = (NotificationManager)context.getSystemService(NOTIFICATION_SERVICE);
Notification.Builder builder = new Notification.Builder(context);
Intent notificationIntent = new Intent(context, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(context,0,notificationIntent,0);
//set
builder.setContentIntent(contentIntent);
builder.setSmallIcon(R.drawable.cal_icon);
builder.setContentText("Contents");
builder.setContentTitle("title");
builder.setAutoCancel(true);
builder.setDefaults(Notification.DEFAULT_ALL);
Notification notification = builder.build();
nm.notify((int)System.currentTimeMillis(),notification);
}