Android ListView与OnItemClickListener和GestureDetector

Question

我有一个如下的ListActivity：

public class ShowDayActivity extends ListActivity implements OnItemClickListener {
    private GestureDetector gestureDetector;
    private View.OnTouchListener gestureListener;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.day);
        registerForContextMenu(getListView());

        gestureDetector = new GestureDetector(new MyGestureDetector());
        gestureListener = new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                return gestureDetector.onTouchEvent(event);
            }
        };

        getListView().setOnItemClickListener(this);
        getListView().setOnTouchListener(gestureListener);
    }

    @SuppressWarnings("static-access")
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        ...
        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        ...
        return super.onContextItemSelected(item);
    }

    Override
    public void onItemClick(AdapterView<?> parent, View v, int pos, long id) {
        editEvent(pos);
    }

    class MyGestureDetector extends SimpleOnGestureListener {
        private static final int SWIPE_MIN_DISTANCE = 120;
        private static final int SWIPE_MAX_OFF_PATH = 250;
        private static final int SWIPE_THRESHOLD_VELOCITY = 200;

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, 
                               float velocityX, float velocityY) {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
               return false;
            }
            // right to left swipe
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Log.d("ICS-Calendar", "Fling left");
                return true;
            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Log.d("ICS-Calendar", "Fling right");
                return true;
            }

            return false;
        }
    }   
} 

列表项上的 contextListener（长按）很完美地工作。今天我添加了 gestureListener 和 Detector，它们也能正常工作，但是：

GestureDetector 确实检测到了快速滑动，但在完成其逻辑之后，上下文菜单会打开，显然这不是我想要的。有什么想法我做错了什么，或者我该怎么办？

- Leopard2A5

Answer 1

通常，当检测到onFling时，您需要调用cancelLongPress()方法来取消视图和所有视图子级的长按事件。但是对于AbsListView这个方法什么也没做。 :(

但我已经找到了解决方法：在回调函数onFling中，在所有事情都被处理后，对您的ListView对象执行以下操作：

Event cancelEvent = Event.obtain(ev2);
cancelEvent.setAction(MotionEvent.ACTION_UP);
listView.onTouchEvent(cancelEvent);

- Odysseos

---

很好。如果您没有ev2，则可以使用替代调用：list.onTouchEvent(MotionEvent.obtain(0, 0, MotionEvent.ACTION_CANCEL, 0, 0, 0)); - Pointer Null

Answer 2

public class GestureDemoActivity extends ListActivity {

    public void onCreate(Bundle savedInstanceState) {
        // something init code.
        getListView().setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (mDetector.onTouchEvent(event)) {
                    MotionEvent cancelEvent = MotionEvent.obtain(event);
                    cancelEvent.setAction(MotionEvent.ACTION_CANCEL);
                    v.onTouchEvent(cancelEvent);
                    return true;
                }
                return false;
            }
        });
    }
}

- meizilp