onDoupleTap不会开火

Question

我想制作一个响应双击的mapview并获取点击位置的地点并将其返回给调用者活动..我在eclipse模拟器中测试我的应用程序,但是当我双击地图时没有任何反应和我的onDoubleTap()方法永远不会进入

这是我的代码

public class MYMapActivity extends MapActivity implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener{

GestureDetector gestureDetector;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mymapview);
        MapView mapView = (MapView) findViewById(R.id.mapview);
        mapView.setBuiltInZoomControls(true);

        gestureDetector = new GestureDetector(getApplicationContext(), this);
        gestureDetector.setOnDoubleTapListener(this);
    }
@Override
    protected boolean isRouteDisplayed() {
        return false;
    }

    @Override
    public boolean onDoubleTap(MotionEvent mev) {
        MapView mapView = (MapView) findViewById(R.id.mapview);
        Projection p = mapView.getProjection();
        GeoPoint geoPoint = p.fromPixels((int) mev.getX(), (int) mev.getY());
        int latitude = geoPoint.getLatitudeE6();
        int longitude = geoPoint.getLongitudeE6();
        Intent resultIntent = new Intent();
        resultIntent.putExtra("latitude", latitude);
        resultIntent.putExtra("longitude", longitude);
        setResult(Activity.RESULT_OK, resultIntent);
        finish();
        return true;
    }

    @Override
    public boolean onDoubleTapEvent(MotionEvent e) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean onDown(MotionEvent e) {
        // TODO Auto-generated method stub
        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) {
        // TODO Auto-generated method stub
        return false;
    }

}

什么是错的或什么错过了让我的双击永远不会开火？

Answer 1

我想出了我的代码中缺少什么,我在这里写给任何能够遇到同样问题的人

第一:

我必须在初始化gestureDetector对象后添加此行

        gestureDetector = new GestureDetector(this, this);
        gestureDetector.setOnDoubleTapListener(this);
        mapView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                return gestureDetector.onTouchEvent(event);
            }
        });

第二:我必须在onDown方法中返回true,因为每次点击都会调用它,双击取决于它

@Override
public boolean onDown(MotionEvent e) {
    return true;
}

这就是您在活动中实现doubleTap监听器所需的全部内容.