android - 使用 onDraglistener 动画拖放以返回原始位置(如果未放在目标上)

Question

我正在制作一个游戏应用程序，我需要在其中使用 onDraglistener 进行拖放，这是我在实现 onDraglistener 的类上所做的。

  @Override
public boolean onDrag(View v, DragEvent event) {
    switch (event.getAction()) {
    case DragEvent.ACTION_DRAG_STARTED:
        Log.v("here","drag started");
        //no action necessary
        break;
    case DragEvent.ACTION_DRAG_ENTERED:
        //no action necessary
        Log.v("here","drag enteres");
        break;
    case DragEvent.ACTION_DRAG_LOCATION:
     int mCurX = (int) event.getX();
    int mCurY = (int) event.getY();
    Log.v("Cur(X, Y) : " ,"here ::" + mCurX + ", " + mCurY );
    break;
    case DragEvent.ACTION_DRAG_EXITED:        
        //no action necessary

        Log.v("here","drag exits");
        break;
    case DragEvent.ACTION_DROP:
            .................do what ever when dropped...
     }

这是我在要拖放的 View 的 touchlistener 上所做的:

public boolean onTouch(View view, MotionEvent motionEvent) {
    if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
        /*
         * Drag details: we only need default behavior
         * - clip data could be set to pass data as part of drag
         * - shadow can be tailored
         */
        view.setTag("option"+index);
        ClipData data = ClipData.newPlainText("tag", "option"+index);
        shadowBuilder = new View.DragShadowBuilder(view);

        //start dragging the item touched
        view.startDrag(data, shadowBuilder, view, 0);


        offsetX = (int)view.getX();//(int)motionEvent.getX();
         offsetY = (int)view.getY();//motionEvent.getY();
         Log.v("here","it is ::" + (int)motionEvent.getX() + " , "+(int)motionEvent.getY());

         return false;
 }

现在它构建了阴影生成器，它可以拖动到您用手指拖动的任何地方。

我如何让阴影生成器或 View 在未放置到目标时返回到其位置的动画？

我尝试了 public boolean onInterceptTouchEvent(MotionEvent event) 并移动到父 View 并获取 x,y 位置并为其设置动画以返回到其原始位置，但它被取消了操作。

有什么方法可以让 x,y 坐标到达 View 在目标以外的位置。然后我就可以在位置之间设置动画。

Answer 1

你需要处理掉落:

switch (event.getAction()) {
    case DragEvent.ACTION_DRAG_ENTERED:
     //break here was removed in purpose so you can see the shadow and the element is still at its initial place.
    case DragEvent.ACTION_DROP:
            View view = (View) event.getLocalState();
        if (prioritiesList.contains(v)) {

            ViewGroup viewgroup = (ViewGroup) view.getParent();
            viewgroup.removeView(view);

            LinearLayout containView = (LinearLayout) v;
            containView.addView(view);
            view.setVisibility(View.VISIBLE);
                    break;
}