GestureDetector检测GridView项目上的DoubleClick

问题描述

注意：解决了此特定问题，但存在严重的后续问题。看看

Note: This specific problem is solved, but there are serious follow-up problems. Have a look at GestureDetector - Detect double click in GridView item's although returning false in onTouchEvent()

我想检测 GridView 图像。
因此，我为中的每个项目 - imageView 分配了一个单独的 OnTouchListener getView （）适配器的方法。 gestureDetector 是适配器类的成员变量。

I want to detect double clicks on distinct items in a GridView of images.Therefore I assigned a separate OnTouchListener to each item-imageView in the getView() method of the adapter. The gestureDetector is a member variable of the adapter-class.

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;
}

private class SingleTapConfirm extends GestureDetector.SimpleOnGestureListener {

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);
    }
}

OnTouchListener 的工作，并获得正确的位置调用。
但是，不管我在做什么， GestureDetector 的方法都不会被调用。这段代码似乎有什么问题？

The OnTouchListener's work and get called with the correct position.However, no matter what I am doing, the methods of the GestureDetector are never called. What seems to be the issue with this code?

更新：onTouch回调需要返回true，至少现在至少GestureDetector有效。但是，返回true会打破其他功能，因为我的GridView有一个长时间点击选择模式和一个全局OnTouchListener。

Update: The onTouch-callback needs to return true, now at least the GestureDetector works. However, returning true breaks the rest of the functionality, since I have a long-click-selection-mode and a global OnTouchListener for my GridView.

第二次更新：
合并特定于项目的OnTouchListener和全局OnTouchListener无法正常工作。 （只在特定项目上识别滑动手势）
我希望能够通过创建自定义视图扩展ImageView并在其中分配特定于项目的OnTouchListener来解决这两个问题。

Second Update:Merging the item-specific OnTouchListener and the global OnTouchListener did not work properly. (swipe gestures only recognized on certain items)I hope that I can work around these two problems by creating a custom View extending ImageView and assigning the item-specific OnTouchListener there.

推荐答案

 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;
        }

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