拖放后移动到原来的位置，放下目标与阴影在Android中？ [英] drag and drop move back to original position after dropped on target with shadow in android?

问题描述

onDrag类：

private class ChoiceDragListener implements OnDragListener {

    @Override
    public boolean onDrag(View v, DragEvent event) {
        switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            // no action necessary
            break;
        case DragEvent.ACTION_DRAG_ENTERED:
            // no action necessary
            break;
        case DragEvent.ACTION_DRAG_EXITED:
            // no action necessary
            break;
        case DragEvent.ACTION_DROP:
            // handle the dragged view being dropped over a drop view
            View view = (View) event.getLocalState();

            dropTarget = (RelativeLayout) v;

            dropped = (RelativeLayout) view;
            tagDropped = dropped.getTag().toString();

            Log.i("tagDropped", "" + tagDropped);
            tagDropTarget = dropTarget.getTag().toString();
            Log.i("tagDropTarget", "" + tagDropTarget);

            matchTag();

            break;
        case DragEvent.ACTION_DRAG_ENDED:
            // no action necessary
            break;
        default:
            break;
        }
        return true;
    }
}

ChoiceTouchListener类：

ChoiceTouchListener class:

private final class ChoiceTouchListener implements OnTouchListener {
    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
             */
            ClipData data = ClipData.newPlainText("", "");
            DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(
                    view);
            // start dragging the item touched
            view.startDrag(data, shadowBuilder, view, 0);
            return true;
        } else {
            return false;
        }
    }
}

现在我想移动对象在原来的位置被拖动

Now i want to move object on its original position where it is drag

我有这样的搜索，但没有回答任何一个

I have search like that but not answered any one drag and drop with onDraglistener animate to go back to original position if not dropped on target

推荐答案

首先得到拖动器控件和拖动接收器控件之间的距离：
textview1 是拖动器控件
textview2 是拖动接收器控件

first get the distance between dragger control and drag receiver control: textview1 is dragger control textview2 is drag receiver control

//if text view2 is below textview one and text view 2 is on the right of text view one
int topMargin=textview2_top_margin - textview1_top_margin
int leftMargin=textview2_left_margin - textview1_left_margin

public void animation() {
  Animation animation = new TranslateAnimation(left_margin, 0, topMargin, 0);
  animation.setDuration(1000);
  controlToAnimate.startAnimation(animation);
 }

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