从异步后台服务回调创建时,为什么我的通知未显示?

时间:2017-05-02 09:20:50

标签: android android-asynctask android-service android-notifications android-background

我创建了一个Service,而不是intentservice,因为我需要做一些异步的东西(位置+服务器调用),最后创建一个Notification。

我首先有一个创建通知的广播接收器,仅此而已。这很好。但是,在服务中我启动一个位置管理器,然后在回调中启动一个异步,并在THAT回调中尝试创建一个通知,它不会显示在抽屉中!

这让我发疯了。我尝试了在代码中看到的吐司,并且有效...... 我真的很感激帮助。

我的服务中的代码(为简洁起见,简化了一点)如果一切正常,调用服务器,记录方法等,但抽屉中出现NO Notification(仅当我直接从onStartCommand调用cleanup时):

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Log.d(TAG, "onStartCommand");
    //.... doing various other stuff

    handleAsyncStuff(session);
    return START_STICKY;
}

....in my callback from final async server rest call:


private void cleanup(String header, String message){
    try{
        Log.d(TAG, "cleanup;header;" + header + ";message;" + message);

        int duration = Toast.LENGTH_SHORT;
        Toast toast = Toast.makeText(getApplicationContext(), message, duration);
        toast.show();

        Intent notificationIntent = new Intent(getApplicationContext(), MainTabActivity.class);
    notificationIntent.putExtra(PreferencesHandler.INTENT_HEADER_PARAM, header);        notificationIntent.putExtra(PreferencesHandler.INTENT_MESSAGE_PARAM, message);

        final NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext());
    builder.setContentTitle(header)
        .setAutoCancel(true)
        .setWhen(System.currentTimeMillis())         
        .setContentText(message)
        .setSmallIcon(R.drawable.notification)
        .setAutoCancel(true)
        .setDefaults(Notification.DEFAULT_ALL);

    PendingIntent pendingIntent = PendingIntent.getActivity(GeofenceBackgroundService.this.getApplicationContext(),
        NOTIFICATION_ID,
        notificationIntent,
        PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(pendingIntent);

    Notification notification = builder.build();

    NotificationManager manager = (NotificationManager)     getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(NOTIFICATION_ID, notification);

    }finally{
        //stopSelf(); Comment out did not make notification appear!
    }
}

1 个答案:

答案 0 :(得分:0)

尝试像manager.notify( new Random()。nextInt(),通知);每次都必须传递不同的通知ID,否则它将被旧的通知ID替换