java - GestureDetector 检测 GridView 项目上的 DoubleClick

Question

注意:这个具体问题已经解决，但是后续还有严重的问题。看看GestureDetector - Detect double click in GridView item's although returning false in onTouchEvent()

我想检测图像 GridView 中不同项目的双击。 因此，我在适配器的 getView() 方法中为每个 item-imageView 分配了一个单独的 OnTouchListener 。 gestureDetector 是适配器类的成员变量。

private GestureDetectorCompat gestureDetector;

public ImageGridViewAdapter(Context c, ArrayList<UriWrapper> startUpImages)     {
    mContext = c;
    uriManager  = new UriManager(startUpImages);
    gestureDetector = new GestureDetectorCompat(mContext, new SingleTapConfirm());
}

public View getView(final int position, View recycled, ViewGroup parent) {

    ViewHolder holder;
    if (recycled == null) {
       ..... find items by id
    } else{
        holder = (ViewHolder) recycled.getTag();
    }

    // Set listener to item image
    holder.image.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // Always returns false, the gestureDetector does not detect anything
            boolean ret = gestureDetector.onTouchEvent(event);
            // At least the onTouch-callback gets called with the correct position
            Log.e(TAG, "onTouch returned " + ret + " at position " + position);
            return true;
        }
    });

    // Use glide library to load images into the image views
    Glide.with(mContext)....into(holder.image);
    return recycled;
}

私有(private)类 SingleTapConfirm 扩展 GestureDetector.SimpleOnGestureListener {

    @Override
    public boolean onSingleTapConfirmed(MotionEvent event) {
        Log.e(TAG, "onSingleTapConfirmed"); // never called..
        return true;
    }

    @Override
    public boolean onDoubleTap(MotionEvent e) {
        Log.e(TAG, "onDoubleTap"); // never called..
        return super.onDoubleTap(e);
    }
}

OnTouchListener 的工作并在正确的位置被调用。 但是，无论我在做什么，都不会调用 GestureDetector 的方法。这段代码似乎有什么问题？

更新:onTouch回调需要返回true，现在至少GestureDetector可以工作。但是，返回 true 会破坏其余功能，因为我的 GridView 有一个长按选择模式和一个全局 OnTouchListener。

第二次更新: 合并特定于项目的 OnTouchListener 和全局 OnTouchListener 无法正常工作。 (仅在某些项目上识别滑动手势) 我希望可以通过创建一个扩展 ImageView 的自定义 View 并在那里分配特定于项目的 OnTouchListener 来解决这两个问题。

Answer 1

 private GestureDetectorCompat gestureDetector;

    // in your adapter constructor
    gestureDetector = new GestureDetector(context, new SingleTapConfirm());

    public View getView(final int position, View recycled, ViewGroup parent) {

        ViewHolder holder;
        if (recycled == null) {
            .....find items by id
        } else {
            holder = (ViewHolder) recycled.getTag();
        }

        // Set listener to item image
        holder.image.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // Use lazy initialization for the gestureDetector
                gestureDetector.onTouchEvent(event);
                // At least the onTouch-callback gets called with the correct position
                return true;
            }
        });

        // Use glide library to load images into the image views
        Glide.with(mContext)....into(holder.image);
        return recycled;
    }

    private class SingleTapConfirm extends GestureDetector.SimpleOnGestureListener {

        @Override
        public boolean onSingleTapConfirmed(MotionEvent event) {
            Log.e(TAG, "onSingleTapConfirmed"); // never called..
            return true;
        }

        @Override
        public boolean onDoubleTap(MotionEvent e) {
            Log.e(TAG, "onDoubleTap"); // never called..
            return super.onDoubleTap(e);
        }
    }

更新:

        @Override
        public boolean onTouch(View v, MotionEvent event) {anything
            gestureDetector.onTouchEvent(event);
            return true;
        }