拖动查看并将其放在RecyclerView项目Android上 [英] Drag View and Drop it on RecyclerView item Android

问题描述

我正在开发一个包含以下内容的屏幕的Android应用程序：

I am developing an android application that has a screen contains the following:

1. 包含如下图所示类别的回收器视图

1. Recycler view that contains categories as the below figure
2. Separate view at the botton and the user should able to drag it on a RecyclerView item, and after drop the user will show changing at the RecyclerView item data (for example items count at the category)

我需要一些帮助，如何实现这个过程
将View拖入Recycler项目，下图解释了我想做，但不知道该怎么做

I need some help about how to implement this process to drag View into Recycler item, the following figure explains exactly what I want to do but have no idea how to do it

任何帮助是非常感谢

推荐答案

首先向 onCreateViewHolder 您的回收商适配器。

Start by adding a draglistener to your inflated view in onCreateViewHolder of your recycler adapter.

view.setOnDragListener(new OnDragListener() {
        @Override
        public boolean onDrag(View view, DragEvent dragEvent) {

            switch (dragEvent.getAction()) {
                case DragEvent.ACTION_DRAG_STARTED:
                    // drag has started, return true to tell that you're listening to the drag
                    return true;

                case DragEvent.ACTION_DROP:
                    // the dragged item was dropped into this view
                    Category a = items.get(getAdapterPosition());
                    a.setText("dropped");
                    notifyItemChanged(getAdapterPosition());
                    return true;
                case DragEvent.ACTION_DRAG_ENDED:
                    // the drag has ended
                    return false;
            }
            return false;
        }
    });

在 ACTION_DROP 案例中，您可以更改模型并调用 notifyItemChanged（），或直接修改视图（不会处理重新绑定的情况）。另外在 onCreateViewHolder 中添加一个 longClickListener 到您的查看，以及在 onLongClick 开始拖动：

In the ACTION_DROP case you can either change the model and call notifyItemChanged(), or modify directly the view (that won't handle the rebinding case). Also in onCreateViewHolder add a longClickListener to your View, and in onLongClick start the drag:

ClipData.Item item = new ClipData.Item((CharSequence) view.getTag());
    String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
    ClipData dragData = new ClipData(view.getTag().toString(),
            mimeTypes, item);
    view.setVisibility(View.GONE);
    HeptagonDragShadowBuilder myShadow = new HeptagonDragShadowBuilder(Heptagon.this, 1.1f);

    if (VERSION.SDK_INT >= VERSION_CODES.N) {
        view.startDragAndDrop(dragData, myShadow, null, 0);
    } else {
        view.startDrag(dragData, myShadow, null, 0);
    }

有关拖放的更多信息，请查看 android开发者网站

For more information about drag and drop check out the android developers site

这篇关于拖动查看并将其放在RecyclerView项目Android上的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！