野外和Spliceongesturelistener的麻烦

Question

我正在实现一个像下面的问题一样的onfling探测器： 删除网格布局的删除手势检测

但是，我只是无法让它工作。 如果我设置了我的应用程序的某种方式导致这个问题（也许是ASYNCTASK？），这就是我的应用程序的结构：

（试图使这个恰好格式化的列表，但它出于某种原因拧紧以下的代码？）


--Mapactivity创建MapView。

--mapView创建一个ASYNCTASK从URL获取XML。

- ASYNCTASK的--onPostexecute（）解析XML并使用获取的数据添加逐个overiedoverlay

- Otep（）逐个overizoverlay的函数使用loaderimageview（ http://www.anddev.org/novice-turorials-f8/imageview-with-loading-spinner-t49439.html ）

--ontap（）函数然后调用下面列出的popuppanel类的show（）函数

您可以从下面的代码中看到，评论说明的线条工作。但是，与Mygesturedetector类一起使用时，Ontouch和Onfling事件永远不会击中。

class PopupPanel {
    View popup;
    boolean isVisible = false;
    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;
    private GestureDetector gestureDetector;
    public View.OnTouchListener gestureListener;

    PopupPanel(Context context, int layout) {
        ViewGroup parent = (ViewGroup) map.getParent();

        popup = ((MapActivity) context).getLayoutInflater().inflate(layout, parent, false);

        SelectFilterActivity selectFilterActivity = new SelectFilterActivity();
        popup.setOnClickListener(selectFilterActivity);

// This works!
//            popup.setOnTouchListener(new View.OnTouchListener() {
//                public boolean onTouch(View v, MotionEvent event) {
//                    Toast.makeText(map.getContext(), "Touched", Toast.LENGTH_SHORT).show();
//                    return false;
//                }
//            });

        // Gesture detection
        gestureDetector = new GestureDetector(new MyGestureDetector());
        gestureListener = new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
                if (gestureDetector.onTouchEvent(event)) {
                    return true;
                }
                return false;
            }
        };
    }

    class MyGestureDetector extends SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            try {
                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) {
                    Toast.makeText(map.getContext(), "Left Swipe", Toast.LENGTH_SHORT).show();
                }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    Toast.makeText(map.getContext(), "Right Swipe", Toast.LENGTH_SHORT).show();
                }
            } catch (Exception e) {
                // nothing
            }
            return false;
        }

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

    View getView() {
        return (popup);
    }

    void show(boolean alignTop) {
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);

        if (alignTop) {
            lp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
            lp.setMargins(0, 20, 0, 0);
        } else {
            lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
            lp.setMargins(0, 0, 0, 60);
        }

        hide();

        ((ViewGroup) map.getParent()).addView(popup, lp);
        isVisible = true;
    }

    void hide() {
        if (isVisible) {
            isVisible = false;
            ((ViewGroup) popup.getParent()).removeView(popup);
        }
    }
}

.

Answer 1

I'm not 100% sure if this is the reason, but I didn't see call to View.setOnTouchListener in your code for gestureListener. I would've expected line;

setOnTouchListener(gestureListener)

After you've created it.

Answer 2

Try returning true from your MyGestureDetector.onDown. The superclass implementation is to return false which then suppresses the delivery of future events until the touch is released.