如何在 android 关闭应用程序的情况下获取通知

Question

我正在开发一个每五秒触发一次通知的应用程序，但即使在应用程序关闭或终止时我也需要这样做，就像 whats 应用程序和 gmail 通知一样...运行我的通知正在使用该服务，但是当我关闭或终止应用程序通知时，没有人能告诉我该怎么做这就是我所做的这是我的 activity:

    package com.example.servicesandroid;


    import java.util.Timer;
    import java.util.TimerTask;

    import android.app.Activity;
    import android.app.ActivityManager;
    import android.app.ActivityManager.RunningServiceInfo;
    import android.content.Context;
    import android.content.Intent;
    import android.os.Bundle;
    import android.os.Handler;
    import android.view.View;
    import android.widget.Button;


    public class MainActivity extends Activity {

            Timer timer;
            Handler handler;
            TimerTask timer_task;

         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             handler = new Handler();
             setContentView(R.layout.activity_main);
             Button buttonStartService = (Button)findViewById(R.id.startservice);
             Button buttonStopService = (Button)findViewById(R.id.stopservice);
             timer = new Timer();
             timer_task = new TimerTask() {

                @Override
                public void run() {

                    Intent intent = new Intent(MainActivity.this, Androidservice.class);
                      MainActivity.this.startService(intent);
                }
            };
timer.schedule(timer_task, 5,5000);

这是我的服务：

package com.example.servicesandroid;


import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.IBinder;

public class Androidservice extends Service {

    final static String ACTION = "NotifyServiceAction";
    final static String STOP_SERVICE = "";
    final static int RQS_STOP_SERVICE = 1;

    NotifyServiceReceiver notifyServiceReceiver;

    private static final int MY_NOTIFICATION_ID = 1;
    private NotificationManager notificationManager;
    private Notification myNotification;
    private final String myBlog = "http://sample.com/";

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        notifyServiceReceiver = new NotifyServiceReceiver();
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub

        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ACTION);
        registerReceiver(notifyServiceReceiver, intentFilter);

        // Send Notification
        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        myNotification = new Notification(R.drawable.ic_launcher,
                "Notification!", System.currentTimeMillis());
        Context context = getApplicationContext();
        String notificationTitle = "Notification!";
        String notificationText = "http://sample.com/";
        Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(myBlog));
        PendingIntent pendingIntent = PendingIntent.getActivity(
                getBaseContext(), 0, myIntent, Intent.FLAG_ACTIVITY_NEW_TASK);
        myNotification.defaults |= Notification.DEFAULT_SOUND;
        myNotification.flags |= Notification.FLAG_AUTO_CANCEL;
        myNotification.setLatestEventInfo(context, notificationTitle,
                notificationText, pendingIntent);
        notificationManager.notify(MY_NOTIFICATION_ID, myNotification);

        return  Service.START_STICKY;
    }



    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        this.unregisterReceiver(notifyServiceReceiver);
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    public class NotifyServiceReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context arg0, Intent arg1) {
            // TODO Auto-generated method stub
            int rqs = arg1.getIntExtra("RQS", 0);
            if (rqs == RQS_STOP_SERVICE) {
                stopSelf();


            }
        }
    }

}

Answer 1

您在 Main Activity 中使用计时器来启动通知。当您关闭您的应用程序时，计时器会停止，您的通知也会停止。在服务本身内部转移计时器的工作。这将帮助您在不依赖 Activity.

的情况下启动通知

Answer 2

您正在从 activity 右侧触发计时器任务。当应用程序关闭时 activity 被销毁，您的 task.Try 更改服务内的触发机制也会被销毁。

Answer 3

您似乎在每次启动计时器时都启动了服务。相反，将计时器逻辑转移到服务并仅启动服务一次。如果您需要更多说明，请询问。

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