Activity 的预期服务在应用关闭时停止

Question

我有一项服务 chatService，它会在 MainActivity 启动时启动。即当应用运行s.

我想运行即使在应用程序关闭时也始终使用此服务。但不幸的是，当我关闭我的应用程序时，服务停止了。当 android 启动或我的应用程序启动时，我想运行 newMsg() 总是在后台。但它会在应用程序关闭时关闭。

有人能给我指出正确的方向吗？

MainActivity.java

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Intent intService =  new Intent(MainActivity.this, ChatHeadService.class);
       startService(intService);
    }
}

chatService.java

public class chatService extends Service {      
        public void onCreate() {
            super.onCreate();
            new newMsg(this,null,null,null).execute(); 
       }
     ...
}

newMsg.java

protected void onPreExecute() {
     super.onPreExecute();  
}   

protected JSONArray doInBackground(Object... v) {
...
}
protected void onPostExecute(JSONArray json) {
    ...
    new Handler().postDelayed(new Runnable() {
        public void run() {
            new newMsg(main,...,...,...).execute();
        }
    }, 10000);      
}

更新 1

将我的 new newMsg(this,10,null,null,null).execute(); 转移到 onStartCommand() 并添加了 return START_STICKY。

你猜怎么着？

没区别！.

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // TODO Auto-generated method stub
    new newMsg(this,10,null,null,null).execute();
    return START_STICKY;
}

Answer 1

您可以使用 RETURN START STICKY 我正在使用智能手机，所以无法 post 代码。

搜索RETURN开始置顶

public class Serv extends Service {

    String t,msg1;
    int id;

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

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

        timer.schedule(new TimerTask() {

            @Override
            public void run() {
                // TODO Auto-generated method stub

                ConnectionDetector cd = new ConnectionDetector(getApplicationContext());
//ConnectionDetector  is custom class for detecting internet connection
//isCD() returns true if internet connection available


                if(cd.isCD())    
                   getData();

            }
        }, 0,360000);


        return START_STICKY;

    }

Answer 2

通过在 chatService.java 文件中替换它，我可以做我想做的事。但它始终将通知保持在顶部。任何人都可以告诉我如何在不通知的情况下实现这一目标，这将有所帮助并且更好。

chatService.java

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // TODO Auto-generated method stub
    final int myID = 1234;

    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent pendIntent = PendingIntent.getActivity(this, 0, intent, 0);

    //This constructor is deprecated. Use Notification.Builder instead
    Notification notice = new Notification(R.drawable.ic_launcher, "Ticker text", System.currentTimeMillis());

    //This method is deprecated. Use Notification.Builder instead.
    notice.setLatestEventInfo(this, "Title text", "Content text", pendIntent);

    notice.flags |= Notification.FLAG_NO_CLEAR;
    startForeground(myID, notice);

    return super.onStartCommand(intent, flags, startId);
    //return Service.START_STICKY;
}

Activity 的预期服务在应用关闭时停止

Intended Service from Activity stopped when app is closed

java

service

android

android-intent

android-activity