两个recycleview拖拽item示例代码

以下是一个简单的示例代码，演示如何实现两个RecyclerView之间的拖拽添加item功能：

public class MainActivity extends AppCompatActivity implements ItemTouchHelperAdapter {

    private RecyclerView recyclerView1, recyclerView2;
    private Adapter1 adapter1;
    private Adapter2 adapter2;
    private List<String> data1 = new ArrayList<>();
    private List<String> data2 = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView1 = findViewById(R.id.recyclerView1);
        recyclerView2 = findViewById(R.id.recyclerView2);

        // 初始化数据
        for (int i = 0; i < 10; i++) {
            data1.add("item " + i);
            data2.add("item " + (i + 10));
        }

        // 创建Adapter和LayoutManager
        adapter1 = new Adapter1(data1, this);
        adapter2 = new Adapter2(data2, this);
        LinearLayoutManager layoutManager1 = new LinearLayoutManager(this);
        LinearLayoutManager layoutManager2 = new LinearLayoutManager(this);
        recyclerView1.setLayoutManager(layoutManager1);
        recyclerView2.setLayoutManager(layoutManager2);
        recyclerView1.setAdapter(adapter1);
        recyclerView2.setAdapter(adapter2);

        // 创建ItemTouchHelper
        ItemTouchHelper.Callback callback = new SimpleItemTouchHelperCallback(this);
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
        itemTouchHelper.attachToRecyclerView(recyclerView1);
        itemTouchHelper.attachToRecyclerView(recyclerView2);
    }

    // 实现ItemTouchHelperAdapter接口
    @Override
    public void onItemMove(int fromPosition, int toPosition) {
        // 根据拖拽的位置，将数据从一个RecyclerView的Adapter中删除，添加到另一个RecyclerView的Adapter中
        if (fromPosition < data1.size()) {
            String item = data1.remove(fromPosition);
            data2.add(toPosition, item);
            adapter1.notifyItemRemoved(fromPosition);
            adapter2.notifyItemInserted(toPosition);
        } else {
            String item = data2.remove(fromPosition - data1.size());
            data1.add(toPosition, item);
            adapter2.notifyItemRemoved(fromPosition - data1.size());
            adapter1.notifyItemInserted(toPosition);
        }
    }

    @Override
    public void onItemDismiss(int position) {
        // 根据删除的位置，从另一个RecyclerView的Adapter中删除对应的数据
        if (position < data1.size()) {
            data2.remove(position);
            adapter2.notifyItemRemoved(position);
        } else {
            data1.remove(position - data1.size());
            adapter1.notifyItemRemoved(position - data1.size());
        }
    }
}

在上述代码中，Adapter1和Adapter2分别是两个RecyclerView的Adapter，SimpleItemTouchHelperCallback是ItemTouchHelper的一个回调类，用于实现拖拽和删除item的功能。实现的拖拽添加item的方法在MainActivity中的onItemMove()方法中，根据拖拽的位置，将数据从一个RecyclerView的Adapter中删除，添加到另一个RecyclerView的Adapter中。删除item的方法在MainActivity中的onItemDismiss()方法中，根据删除的位置，从另一个RecyclerView的Adapter中删除对应的数据。