Android通知仅声音播放通知未显示在通知抽屉中

我正在尝试使用AlarmManager和Notification Manager在特定时间触发通知.我面临一个奇怪的问题.发出通知时，仅播放声音，但通知未显示在通知抽屉中. 我在日志中出现错误

i am trying to fire notification in at a particular time using AlarmManager and Notification manager. i am facing a strange problem. when notification is fired only sound plays but notification is not shown in the notification drawer. i got an error in the log

04-26 11:32:09.217    1222-1222/? E/NotificationService﹕ WARNING: In a future release this will crash the app: com.example.shiv.selftweak

我的代码是.

调用AlarmManager的类

The class which calls the AlarmManager

        Intent intent1 = new Intent(this, FireNotification.class);
        PendingIntent pendingIntent = PendingIntent.getService(this, 1000, intent1, 0);
        AlarmManager am = (AlarmManager)this.getSystemService(ALARM_SERVICE);
        am.set(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(),  pendingIntent);

FireNotification类

FireNotification class

public class FireNotification extends Service {

    @Override
    public void onCreate() {
        Intent intent = new Intent(this, MainActivity.class);
        long[] pattern = {0, 300, 0};
        PendingIntent pi = PendingIntent.getActivity(this, 1234, intent, 0);
        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
                .setContentTitle("Self tweak")
                .setContentText("Habbits are waiting for last dones")
                .setVibrate(pattern)
                .setAutoCancel(false);

        mBuilder.setContentIntent(pi);
        mBuilder.setDefaults(Notification.DEFAULT_SOUND);
        mBuilder.setAutoCancel(false);
        NotificationManager mNotificationManager = (NotificationManager) this.getSystemService(NOTIFICATION_SERVICE);
        mNotificationManager.notify(1234, mBuilder.build());
    }

@Override
public IBinder onBind(Intent intent) {
    return null;
}

}

Android清单

 <service android:name=".FireNotification"></service>
        <intent-filter>

            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>

当通知仅触发声音播放时.但是它没有显示在没有显示通知的通知抽屉中.

when notification fires only sound plays. but it is not getting shown in the notification drawer which shows no notification.