Android拖放ImageView，没有再次拖动的选项

Question

在我的应用程序中，我有 10 个线性布局用作 ImageView 的拖放区。 我想将 ImageView（纸牌游戏）拖到其放置区。 这部分工作正常。 问题是，我想让用户只做一个动作 - 然后取消 DragListener 以便 ImageView 将被卡在其放置区域。 有任何想法吗？ 这是我的代码中的一些内容：

    private final class MyTouchListener implements OnTouchListener {
    public boolean onTouch(View view, MotionEvent motionEvent) {
    SetDragListner();

        if (TouchTheStart != false) {
            if (CountTheTime < 20) {
                if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
                    CountCards();
                    if(ReachedDestination==false){
                    Random = getRandom();
                    getCard();
                    }
                    ReachedDestination=true;
                    ClipData data = ClipData.newPlainText("", "");
                    DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(
                            view);
                    view.startDrag(data, shadowBuilder, view, 0);
                    return true;
                } else {
                    return false;
                }

            }

        }
        return true;

    }
}

class MyDragListener implements OnDragListener {

    Drawable enterShape = getResources().getDrawable(
            R.drawable.shape_droptarget);
    Drawable normalShape = getResources().getDrawable(R.drawable.shape);

    @Override
    public boolean onDrag(View v, DragEvent event) {

        int action = event.getAction();
        switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            // Do nothing
            break;
        case DragEvent.ACTION_DRAG_ENTERED:
            v.setBackground(enterShape);
            break;
        case DragEvent.ACTION_DRAG_EXITED:
            v.setBackground(normalShape);
            break;
        case DragEvent.ACTION_DROP:
            // Dropped, reassign View to ViewGroup

            View view = (View) event.getLocalState();

            ViewGroup owner = (ViewGroup) view.getParent();
            owner.removeView(view);
            LinearLayout container = (LinearLayout) v;
            container.addView(view);
            Cards.remove(Random);
            CountTheTime++;
            ReachedDestination=false;
            break;
        case DragEvent.ACTION_DRAG_ENDED:

            v.setBackground(normalShape);
        default:
            break;
        }
        return true;
    }
}

Answer 1

你可以添加

Boolean allow=true;

并在 onTouch 中添加

public boolean onTouch(View view, MotionEvent motionEvent) {
    if(allow==true){
        //here you do everything and where you want to disallow the other onTouch add allow= false;
    }
    //add your return statement here
}