警报管理器不显示通知

Question

没有错误，但只是没有通知显示。我尝试了一些警报管理器的各种选项，但从未显示通知。

主要活动：

public void startTimer(){
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 13);
        calendar.set(Calendar.MINUTE, 36);
        Intent intent = new Intent(getApplicationContext(), AlarmReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), alarmManager.INTERVAL_DAY, pendingIntent);
        Toast.makeText(MainActivity.this, "TIMER SET!",
                Toast.LENGTH_LONG).show();
    }

Toast出现了，所以我认为闹钟也应该有效，但它没有。

AlarmReceiver.class

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Intent intent1 = new Intent(context,MainActivity.class);
        intent1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        //if we want ring on notifcation then uncomment below line//
//        Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        PendingIntent pendingIntent = PendingIntent.getActivity(context,100,intent1, PendingIntent.FLAG_UPDATE_CURRENT);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context).
               // setSmallIcon(R.drawable.applogo).
                setContentIntent(pendingIntent).
                setContentText("this is my notification").
                setContentTitle("my notificaton").
//                setSound(alarmSound).
        setAutoCancel(true);
        notificationManager.notify(100,builder.build());

    }
}

清单

    <uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>

 <receiver android:name="world.cryneo.partytime.java.AlarmReceiver">
            <intent-filter>
                <action android:name="world.cryneo.partytime.java.alarms" />
            </intent-filter>
        </receiver>

我做错了什么？