应用关闭时发送通知

问题描述：

当应用完全关闭时，如何以编程方式发送通知?

How is it possible to send a notification programmatically, when the App got completely closed?

示例:用户也在Android Taskmanager中关闭了该应用程序，然后等待.该应用程序应在X秒后或当该应用程序检查更新时发送通知.

Example: The User closed the App, also in the Android Taskmanager, and waits. The App should send a notification after X Seconds or when the App check for Updates.

我尝试使用这些代码示例，但是:

I tried to work with these code examples but:

在关闭应用程序时推送通知-活动/操作过多工作
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如何在应用程序处于运行状态时发送本地通知android关闭?-很多信息，但我不知道如何处理

Pushing notifications when app is closed - too many Activities/doesn't work
How do I get my app to send a notification when it is closed? - much information, but I don't know how to deal with it
How to send local notification android when app is closed? - much information, but I don't know how to deal with it

如果可以的话，请尝试以一个示例进行说明，因为初学者(例如我)可以通过这种方式更轻松地学习它.

If you can, try to explain it at an example, because beginners (like me) can easier learn it this way.

答

您可以使用此服务，只需在活动生命周期中启动onStop()即可.使用此代码: startService(new Intent(this, NotificationService.class)); 那么您可以创建一个新的Java类并将此代码粘贴到其中:

You can use this service all you need to do is Start this service onStop() in your activity lifecycle. With this code: startService(new Intent(this, NotificationService.class)); then you can create a new Java Class and paste this code in it:

public class NotificationService extends Service {

    Timer timer;
    TimerTask timerTask;
    String TAG = "Timers";
    int Your_X_SECS = 5;


    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e(TAG, "onStartCommand");
        super.onStartCommand(intent, flags, startId);

        startTimer();

        return START_STICKY;
    }


    @Override
    public void onCreate() {
        Log.e(TAG, "onCreate");


    }

    @Override
    public void onDestroy() {
        Log.e(TAG, "onDestroy");
        stoptimertask();
        super.onDestroy();


    }

    //we are going to use a handler to be able to run in our TimerTask
    final Handler handler = new Handler();


    public void startTimer() {
        //set a new Timer
        timer = new Timer();

        //initialize the TimerTask's job
        initializeTimerTask();

        //schedule the timer, after the first 5000ms the TimerTask will run every 10000ms
        timer.schedule(timerTask, 5000, Your_X_SECS * 1000); //
        //timer.schedule(timerTask, 5000,1000); //
    }

    public void stoptimertask() {
        //stop the timer, if it's not already null
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }

    public void initializeTimerTask() {

        timerTask = new TimerTask() {
            public void run() {

                //use a handler to run a toast that shows the current timestamp
                handler.post(new Runnable() {
                    public void run() {

                        //TODO CALL NOTIFICATION FUNC
                        YOURNOTIFICATIONFUNCTION();

                    }
                });
            }
        };
    }
}

此后，您只需要将服务与manifest.xml结合起来即可:

After this you only need to combine the service with the manifest.xml:

<service
            android:name=".NotificationService"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="your.app.domain.NotificationService" />

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

应用关闭时发送通知

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