将回收器视图项目拖动到图像视图

Question

我想拖放回收器视图项目映像到我的图像视图（在主布局中）。我该如何实现？

我正在使用以下代码到LongitemClickRecyClerviewItem

images_recycler.addOnItemTouchListener(
            new RecyclerItemClickListener(getActivity(), images_recycler ,new RecyclerItemClickListener.OnItemClickListener() {
                @Override public void onItemClick(View view, int position) {
                }
                @Override
                public void onItemLongClick(View view, int position) {

                }
            })
    );


public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener
{
    public static interface OnItemClickListener
    {
        public void onItemClick(View view, int position);
        void onItemLongClick(View view, int position);
     }
    private OnItemClickListener mListener;
    private GestureDetector mGestureDetector;
    public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener)
    {
        mListener = listener;
        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener()
        {
            @Override
            public boolean onSingleTapUp(MotionEvent e)
            {
                return true;
            }
            @Override
            public void onLongPress(MotionEvent e)
            {
                View childView = recyclerView.findChildViewUnder(e.getX(), e.getY());
                if(childView != null && mListener != null)
                {
                    mListener.onItemLongClick(childView, recyclerView.getChildPosition(childView));
                }
            }
        });
    }
    @Override
    public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e)
    {
        View childView = view.findChildViewUnder(e.getX(), e.getY());
        if(childView != null && mListener != null && mGestureDetector.onTouchEvent(e))
        {
            mListener.onItemClick(childView, view.getChildPosition(childView));
        }
        return false;
    }
    @Override
    public void onTouchEvent(RecyclerView view, MotionEvent motionEvent){}
    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }
}

请帮助我提供一些示例或代码谢谢。

Answer 1

在此处查看我的答案，然后将其放在recyclerview项目Android中。
但是您必须在这里进行一些更改。将longClickListener设置为回收器视图iteView在您的onCreateViewHolder方法中，您将其充气。在那里，您开始拖动。将onDragListener设置为您要删除它的ImageView。

编辑

好吧，我在这里添加了一些代码。在您的回收器适配器的onCreateViewHolder中添加以下行：

@Override
public MemberHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(context).inflate(R.layout.yourlayout, parent, false);
    view.setOnLongClickListener(new OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            ClipData.Item item = new ClipData.Item((CharSequence) view.getTag());
            String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
            ClipData dragData = new ClipData(view.getTag().toString(),
                    mimeTypes, item);
            view.setVisibility(View.GONE);
            HeptagonDragShadowBuilder myShadow = new HeptagonDragShadowBuilder(Heptagon.this, 1.1f);
            if (VERSION.SDK_INT >= VERSION_CODES.N) {
                view.startDragAndDrop(dragData, myShadow, null, 0);
            } else {
                view.startDrag(dragData, myShadow, null, 0);
            }
            return true;
        }
    });
    return memberHolder;
}

在您的图像视图上要删除项目的位置添加以下行：

imageView.setOnDragListener(new OnDragListener() {
    @Override
    public boolean onDrag(View view, DragEvent dragEvent) {
        switch (dragEvent.getAction()) {
            case DragEvent.ACTION_DRAG_STARTED:
                // drag has started, return true to tell that you're listening to the drag
                return true;
            case DragEvent.ACTION_DROP:
                // the dragged item was dropped into this view
                Category a = items.get(getAdapterPosition());
                a.setText("dropped");
                notifyItemChanged(getAdapterPosition());
                return true;
            case DragEvent.ACTION_DRAG_ENDED:
                // the drag has ended
                return false;
        }
        return false;
    }
});

编辑2
好的，这是一个解释。当您将侦听器分配到视图时，您会告诉您要收听拖动事件。当拖动事件开始时，侦听器的Ondrag被动作DragEvent.ACTION_DRAG_STARTED发射。在这种情况下，在视图上，您要丢弃您返回的项目，以说明此视图想要捕获拖动项目。当视图在视图上删除视图时，您正在收听onDrag再次通过操作DragEvent.ACTION_DROP发射。在那里，您必须实现逻辑，当该项目删除时要做什么。如果要更改ImageView的映像源或替换ImageView，则必须在DragEvent.ACTION_DROP情况下实现替换逻辑。拖动事件和听众只会告诉您您正在拖动以及在哪里掉落。因此，您必须由您完成任何其他逻辑。就我而言，我通知了我的回收库适配器，某些项目已更改。