2

我想创建一个具有拖放功能的可扩展列表视图，即我可以通过拖放来排列内部或外部项目

4

4 回答 4

1

您从实现 View.OnDragListener 的类创建拖动事件侦听器对象（“侦听器”）。您使用 View 对象的 setOnDragListener() 方法为 View 设置拖动事件侦听器对象。每个 View 对象也有一个 onDragEvent() 回调方法。这两个都在 开发人员部分中进行了更详细的描述。

请参阅此链接以获取工作示例： bit.ly/16r49T3

于 2013-08-16T05:30:57.583 回答
1

您需要添加一些侦听器才能使其正常工作。这些监听器我放置在它们出现的片段的 OnStart 中。

第一个侦听器如下，假设您将列表视图称为“lvListView”（这是为了拖动孩子，我在这里的其他地方找到了它）：

    lvListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
            if (ExpandableListView.getPackedPositionType(id) == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
                int groupPosition = ExpandableListView.getPackedPositionGroup(id);
                int childPosition = ExpandableListView.getPackedPositionChild(id);

                // You now have everything that you would as if this was an OnChildClickListener()
                // Add your logic here.

                //include this:
                View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
                view.startDrag(null, shadowBuilder, lvItems.getItemAtPosition(position), 0);
                // Return true as we are handling the event.
                return true;
            }

            return false;
        }
    });

这允许你拖动孩子，但现在你需要一个监听器来监听你所有的 DubSteppin'（Drop）。我在代码中紧随其后放置了以下内容：

     lvListView.setOnDragListener(new AdapterView.OnDragListener() {

        @Override
        public boolean onDrag(View v, DragEvent event) {
            int action = event.getAction();
            switch (event.getAction()) {
                case DragEvent.ACTION_DRAG_STARTED:
                    //layoutParams = (RelativeLayout.LayoutParams)v.getLayoutParams();
                    Log.i("msg", "Action is DragEvent.ACTION_DRAG_STARTED");

                    // Do nothing
                    break;

                case DragEvent.ACTION_DRAG_ENTERED:
                    Log.i("msg", "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.i("msg", "Action is DragEvent.ACTION_DRAG_EXITED");
                    x_cord = (int) event.getX();
                    y_cord = (int) event.getY();

                    break;

                case DragEvent.ACTION_DRAG_LOCATION:
                    Log.i("msg", "Action is DragEvent.ACTION_DRAG_LOCATION");
                    x_cord = (int) event.getX();
                    y_cord = (int) event.getY();
                    Log.i("msg", Integer.toString(x_cord) + "," + Integer.toString(y_cord));
                    int nPointToPosition = lvListView.pointToPosition(x_cord,y_cord);
                    if(lvListView.getItemAtPosition(nCheck)!= null) {

                        // THE FUN PART IS HERE!
                        // ******this is the header list number******
                        int ngroupPosition = lvListView.getPackedPositionGroup(lvListView.getExpandableListPosition(nCheck));

                        // ******this is the child position******
                        int nchildPosition = lvListView.getPackedPositionChild(lvListView.getExpandableListPosition(nCheck));

                    }
                    break;

                case DragEvent.ACTION_DRAG_ENDED:
                    Log.i("msg", "Action is DragEvent.ACTION_DRAG_ENDED");
                    // This is where I added some activities....
                    break;

                case DragEvent.ACTION_DROP:
                    Log.i("msg", "ACTION_DROP event");
                    // This is also a good place, place with it and see what you want to do
                    break;

                default:
                    break;
            }
            //return value
            return true;
        }
    });//end DragListener

很抱歉“necropost”，但我想把它向前支付，因为通常我在这里的代码块中找到我的答案。

我也从其他代码块中获得了大部分内容，并想出了办法，所以如果你认出你的代码，谢谢！

于 2016-02-03T14:05:25.263 回答
0

如果有人仍在寻找解决方案，我修改了拖放列表视图并将其更新为拖放可扩展列表视图，请在此处查看答案

于 2019-03-20T19:55:35.170 回答