获取RecyclerView的选中项目位置

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this)); // 设置布局管理器
recyclerView.setAdapter(adapter); // 设置适配器

RecyclerView.OnItemTouchListener itemTouchListener = new RecyclerView.OnItemTouchListener() {
    @Override
    public boolean onInterceptTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) {
        return false;
    }

    @Override
    public void onTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) {
        // 获取点击位置
        View childView = rv.findChildViewUnder(e.getX(), e.getY());
        if (childView != null && e.getAction() == MotionEvent.ACTION_UP) {
            int position = rv.getChildAdapterPosition(childView);
            // 处理选中项目位置
            // ...
        }
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }
};

recyclerView.addOnItemTouchListener(itemTouchListener);