从RecyclerView适配器类调用Activity中的方法

// 在适配器类中定义接口
public interface OnItemClickListener {
    void onItemClick(int position);
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private OnItemClickListener mItemClickListener;

    public MyAdapter(OnItemClickListener itemClickListener) {
        mItemClickListener = itemClickListener;
    }

    // ...

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        // 设置点击监听器
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 调用接口方法
                if (mItemClickListener != null) {
                    mItemClickListener.onItemClick(position);
                }
            }
        });
    }

    // ...

    public static class ViewHolder extends RecyclerView.ViewHolder {
        // ViewHolder的代码...
    }
}

public class MainActivity extends AppCompatActivity implements MyAdapter.OnItemClickListener {
    private RecyclerView mRecyclerView;
    private MyAdapter mAdapter;

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

        // 初始化RecyclerView和适配器
        mRecyclerView = findViewById(R.id.recyclerView);
        mAdapter = new MyAdapter(this);

        // 设置布局管理器和适配器
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setAdapter(mAdapter);
    }

    // 实现接口方法
    @Override
    public void onItemClick(int position) {
        // 执行相应的操作，例如调用Activity中的方法
        doSomething(position);
    }

    private void doSomething(int position) {
        // 在这里实现具体的操作
    }
}