DragEventListener在三星S7（6.0）上不起作用

我正在寻找与此相关的方向。我有一个纸牌融合游戏（五个国王），已经玩了大约6个月了；我的最新版本0.9.22自3月以来一直保持稳定。但是，最近我收到用户无法将丢弃物拖到丢弃物堆的报告，并且常见的线程似乎是带有Android 6.0的Samsung S7。当您从手中拖动卡片时，可以拖动的位置将变为透明，并且当您在其上拖动时，它们将恢复为正常（alpha = 1）。您可以拖动的其他地方似乎还可以，但是丢弃堆不会变暗或变亮，这使我认为Drag Event侦听器无法正常工作。

这是DiscardPileDragEventListener：

class DiscardPileDragEventListener implements View.OnDragListener {

    // This is the method that the system calls when it dispatches a drag event to the
    // listener.
    @Override
    public boolean onDrag(final View v, final DragEvent event) {
        //that we are not ready to accept the drag if not at the right point of the play
        CardView cv = (CardView)v;

        // Defines a variable to store the action type for the incoming event
        final int action = event.getAction();

        // Handles each of the expected events
        switch(action) {
            case DragEvent.ACTION_DRAG_STARTED:
                // Determines if this View can accept the dragged data
                if (cv.isAcceptDrag() && event.getClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
                    //fades out of the draw pile
                    cv.startAnimation(Utilities.instantFade(FiveKings.HALF_TRANSPARENT_ALPHA, FiveKings.HALF_TRANSPARENT_ALPHA));
                    // returns true to indicate that the View can accept the dragged data.
                    return true;
                } else {
                    //remind user what they should be doing if in the first few rounds
                    ((FiveKings) cv.getContext()).setShowHint(null, FiveKings.HandleHint.SHOW_HINT, FiveKings.GameDifficulty.EASY);
                    // Returns false. During the current drag and drop operation, this View will
                    // not receive events again until ACTION_DRAG_ENDED is sent.
                    return false;
                }

            case DragEvent.ACTION_DRAG_ENTERED:
                cv.clearAnimation();
                return true;

            case DragEvent.ACTION_DRAG_LOCATION:
                // Ignore the event
                return true;

            case DragEvent.ACTION_DRAG_EXITED:
                cv.startAnimation(Utilities.instantFade(FiveKings.HALF_TRANSPARENT_ALPHA, FiveKings.HALF_TRANSPARENT_ALPHA));
                return true;

            case DragEvent.ACTION_DROP:
                cv.clearAnimation();
                // Gets the item containing the dragged data
                ClipData.Item item = event.getClipData().getItemAt(0); //this is the View index to recover which card

                // Gets the text data from the item.
                String dragData = item.getText().toString();

                //Handle exception here and return false (drop wasn't handled) if it wasn't found
                int iView = -1;
                try {
                    iView = Integer.parseInt(dragData);
                }catch (NumberFormatException e) {
                    return false;
                }
                return ((FiveKings)cv.getContext()).discardedCard(iView);

            case DragEvent.ACTION_DRAG_ENDED:
                if (cv.isAcceptDrag()) cv.clearAnimation();
                return true;

            // An unknown action type was received.
            default:
                Log.e("DiscardPileDragEventListener", "Unknown action type received by OnDragListener.");
        }

        return false;
    }
}

这是设置实际拖动卡的代码段；在此CardView中是ImageView的子类：

            for (Card card : meld) {
                //highlight wildcards unless no dragging (Computer turn, or Human final turn)
                CardView cv = new CardView(this, card, iView, allowDragging ? highlightWildCardRank : null);
                cv.setTag(iView); //allows us to pass the index into the dragData without dealing with messy object passing
...
                cv.bringToFront();
                cv.setClickable(false); //TODO:B: Allow selection by clicking for multi-drag?
                if (allowDragging) {//no dragging of computer cards or Human cards after final turn
                    cv.setOnDragListener(new CardViewDragEventListener()); //needed per-card to reset the dragged card to normal visibility (alpha)
                    cv.setOnTouchListener(new View.OnTouchListener() {
                        @Override
                        public boolean onTouch(View v, MotionEvent event) {
                            if (event.getAction() != MotionEvent.ACTION_DOWN) return false;
                            // Create a new ClipData using the tag as a label, the plain text MIME type, and
                            // the string containing the View index. This will create a new ClipDescription object within the
                            // ClipData, and set its MIME type entry to "text/plain"
                            ClipData dragData = ClipData.newPlainText("Discard", v.getTag().toString());
                            View.DragShadowBuilder cardDragShadow = new CardViewDragShadowBuilder(v);

                            v.startAnimation(Utilities.instantFade(FiveKings.HALF_TRANSPARENT_ALPHA, FiveKings.HALF_TRANSPARENT_ALPHA));
                            // Starts the drag
                            v.startDrag(dragData, cardDragShadow, null, 0);
                            return true;
                        }//end onClick
                    });
                }//end if allowDragging
...

在onCreate中，我设置了Discard Pile onDragListener：

...
        mDiscardPile.setOnDragListener(new DiscardPileDragEventListener());
...

一件麻烦事是，我在“丢弃桩”的父视图中也有一个onDragListener，以在您将卡拖动到“丢弃桩”时提供一条消息。在我的测试中，此方法效果很好，但我只是想知道它是否与某种原因有关。

希望对朝哪个方向提出任何建议。