想要将视图拖放到Android中的另一个视图_java

嘿朋友帮我实现目标。 我是android开发的新手，我唯一想做的就是我要拖动一个按钮并将其拖放到另一个View（即RelativeLayout）上，这是我完成拖动代码的第一件事。

rootView = inflater.inflate(R.layout.fragment_game_map,container,false);

    button1 = (Button) rootView.findViewById(R.id.button1);
    button1.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            ClipData.Item item = new ClipData.Item((CharSequence)v.getTag());
            String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};

            ClipData dragData = new ClipData(v.getTag().toString(),mimeTypes, item);
            View.DragShadowBuilder myShadow = new View.DragShadowBuilder(button1);

            v.startDrag(dragData,myShadow,null,0);
            return true;
        }
    });


    button1.setOnDragListener(new View.OnDragListener() {
        @Override
        public boolean onDrag(View v, DragEvent event) {
            switch (event.getAction()) {
                case DragEvent.ACTION_DRAG_STARTED:
                    layoutParams = (RelativeLayout.LayoutParams) v.getLayoutParams();
                    Log.d(TAG, "Action is DragEvent.ACTION_DRAG_STARTED");

                    // Do nothing
                    break;

                case DragEvent.ACTION_DRAG_ENTERED:
                    Log.d(TAG, "Action is DragEvent.ACTION_DRAG_ENTERED");
                    int x_cord = (int) event.getX();
                    int y_cord = (int) event.getY();
                    break;

                case DragEvent.ACTION_DRAG_EXITED:
                    Log.d(TAG, "Action is DragEvent.ACTION_DRAG_EXITED");
                    x_cord = (int) event.getX();
                    y_cord = (int) event.getY();
                    layoutParams.leftMargin = x_cord;
                    layoutParams.topMargin = y_cord;
                    v.setLayoutParams(layoutParams);
                    break;

                case DragEvent.ACTION_DRAG_LOCATION:
                    Log.d(TAG, "Action is DragEvent.ACTION_DRAG_LOCATION");
                    x_cord = (int) event.getX();
                    y_cord = (int) event.getY();
                    break;

                case DragEvent.ACTION_DRAG_ENDED:
                    Log.d(TAG, "Action is DragEvent.ACTION_DRAG_ENDED");

                    // Do nothing
                    break;

                case DragEvent.ACTION_DROP:
                    Log.d(TAG, "ACTION_DROP event");

                    // Do nothing
                    break;
                default:
                    break;
            }
            return true;
        }
    });

    button1.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_DOWN) {
                ClipData data = ClipData.newPlainText("", "");
                View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(button1);

                button1.startDrag(data, shadowBuilder, button1, 0);
                button1.setVisibility(View.INVISIBLE);
                return true;
            }
            else
            {
                return false;
            }
        }
    });

    return rootView;
}

但是第二件事我没有想法可以做..那就是我想把它放到RelativeLayout上，但是RelativeLayout只能允许一个按钮放到它上面。

您错过了DragLiatenr的要点。 DragListenr侦听拖动事件，并正确处理它们，因此，如果您的RelativeLayout未注册到DragEvent，他将无法处理它们。

实际上，对于您的要求，您只需要侦听ACTION_DROP，并为所有其他事件返回true。

您可能会喜欢这样的东西：

final RelativeLayout container; //You need to initialize your Relativelayout here
    container.setOnDragListener(new View.OnDragListener() {
        @Override
        public boolean onDrag(View v, DragEvent event) {
            switch (event.getAction()) {
                case DragEvent.ACTION_DROP:
                    Log.d(TAG, "ACTION_DROP event");
                    ((ViewGroup)v.getParent()).removeView(v); //you must first remove view from it former container
                    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
                    container.addView(v, params); // of course you need to modify params for your need
                    return true;
                    break;
                default:
                    return true;
            }
        }
    });

另外，为什么还要放置从未使用过的onTouchListenr？

想要将视图拖放到Android中的另一个视图

问题描述

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