My service stop after the back button

问题:

I have a service and an activity that communicate. When I click the button(I have galaxy s3 there is only one button) then my activity of course disapear and my service is keep running but if I click the back (touch) button then my service is destroyed. How can I change that?I want the service to keep running untill the activity destroys it.

EDIT

Here is the code:

Service: public class MyService extends Service { private static final String TAG = "BroadcastService"; public static final String BROADCAST_ACTION = "com.websmithing.broadcasttest.displayevent"; private final Handler handler = new Handler(); private Intent intent; int counter = 0;

    @Override
    public void onCreate() 
    {
        super.onCreate();
        intent = new Intent(BROADCAST_ACTION);  
    }

    @Override
    public void onStart(Intent intent, int startId) 
    {
       // handler.removeCallbacks(sendUpdatesToUI);
        handler.postDelayed(sendUpdatesToUI, 1000); // 1 second

    }

    private Runnable sendUpdatesToUI = new Runnable() {
        public void run() {
            DisplayLoggingInfo();           
            handler.postDelayed(this, 1000); // 10 seconds
        }
    };    

    private void DisplayLoggingInfo() {
        intent.putExtra("counter", String.valueOf(++counter));
        sendBroadcast(intent);
    }

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

    @Override
    public void onDestroy() {       
        handler.removeCallbacks(sendUpdatesToUI);       
        super.onDestroy();
    }       
}

Activity:

public class MainActivity extends Activity {
    private static final String TAG = "BroadcastTest";
    private Intent intent;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        intent = new Intent(this, MyService.class);

        startService(intent);
        registerReceiver(broadcastReceiver, new IntentFilter(MyService.BROADCAST_ACTION));
    }

    private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            updateUI(intent);       
        }
    };    


    @Override
    public void onDestroy() {
        super.onPause();
        unregisterReceiver(broadcastReceiver);
        stopService(intent);        
    }   

    private void updateUI(Intent intent) 
    {
        String counter = intent.getStringExtra("counter"); 
        Log.d(TAG, counter);

        TextView txtCounter = (TextView) findViewById(R.id.textView1);
        txtCounter.setText(counter);
    }
}

回答1:

Ofcourse your service stops, when you press the back button. The back button most calls finish() on the activity, and it is destroyed. When you press the other button (the home button), it just minimizes your app, and it will be only destroyed later, when the OS wants to free up space.

If you want to keep your service running, make it a foreground service, and dont stop it on activity destroy.

回答2:

you can put your app in the background instead off finishing it.

   @Override
    public void onBackPressed() {
     moveTaskToBack(true);
    // super.onBackPressed();
    }