使用服务的GestureDetector

Question

我希望使用服务而不是活动来实现GestureDetector。代码在活动上有效，但在服务上无效。在Service中，我无法对onTouchEvent(MotionEvent e)方法执行@Override操作-这是问题的原因吗？

public class GestureService extends Service implements OnGestureListener {

private GestureDetector gestureScanner;

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}
@Override
public void onCreate() {
    super.onCreate();       
    Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_SHORT).show();
    gestureScanner = new GestureDetector(this);
}


@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Toast.makeText(getBaseContext(),"onStartCommand", Toast.LENGTH_SHORT).show();
    return START_STICKY;

 }

public boolean onTouchEvent(MotionEvent me) {
    return gestureScanner.onTouchEvent(me);
}

@Override
public boolean onDown(MotionEvent e) {
    // TODO Auto-generated method stub
    Toast.makeText(getBaseContext(),"onDown", Toast.LENGTH_SHORT).show();
    return false;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {
    // TODO Auto-generated method stub
    return false;
}
@Override
public void onLongPress(MotionEvent e) {
    // TODO Auto-generated method stub

}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
        float distanceY) {
    // TODO Auto-generated method stub
    return false;
}
@Override
public void onShowPress(MotionEvent e) {
    // TODO Auto-generated method stub

}
@Override
public boolean onSingleTapUp(MotionEvent e) {
    Toast.makeText(getBaseContext(),"onSingleTapUp", Toast.LENGTH_SHORT).show();
    // TODO Auto-generated method stub
    return false;
}

}

我使用startService(new Intent(this,GestureService.class));在activity类中启动了该服务

Answer 1

我猜你想让它成为一种服务，这样你就可以在所有的应用程序中使用它。但从this article上看，它的工作方式并不是这样的:手势是特定于应用程序的。