当RecylerView中的所有onCreateViewHolder都完成时通知

public interface OnAllViewCreatedListener {
    void onAllViewCreated();
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private OnAllViewCreatedListener mListener;

    public MyAdapter(OnAllViewCreatedListener listener) {
        mListener = listener;
    }

    // ...

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // 创建ViewHolder
        ViewHolder viewHolder = new ViewHolder(...);
        // 其他操作
        // ...

        // 当ViewHolder创建完成时，通知接口
        if (mListener != null && getItemCount() == viewHolderCount) {
            mListener.onAllViewCreated();
        }

        return viewHolder;
    }
}

public class MainActivity extends AppCompatActivity implements OnAllViewCreatedListener {
    // ...

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

        RecyclerView recyclerView = findViewById(R.id.recyclerView);
        // 创建适配器，并传入接口实例
        MyAdapter adapter = new MyAdapter(this);
        recyclerView.setAdapter(adapter);
        // 设置布局管理器等
        // ...
    }

    @Override
    public void onAllViewCreated() {
        // 所有ViewHolder都创建完成时的操作
        // ...
    }
}

public interface AllViewCreatedObserver {
    void onAllViewCreated();
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<AllViewCreatedObserver> mObservers = new ArrayList<>();

    public void registerObserver(AllViewCreatedObserver observer) {
        mObservers.add(observer);
    }

    public void unregisterObserver(AllViewCreatedObserver observer) {
        mObservers.remove(observer);
    }

    // ...

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // 创建ViewHolder
        ViewHolder viewHolder = new ViewHolder(...);
        // 其他操作
        // ...

        // 当ViewHolder创建完成时，通知观察者
        if (getItemCount() == viewHolderCount) {
            for (AllViewCreatedObserver observer : mObservers) {
                observer.onAllViewCreated();
            }
        }

        return viewHolder;
    }
}

public class MainActivity extends AppCompatActivity implements AllViewCreatedObserver {
    // ...

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

        RecyclerView recyclerView = findViewById(R.id.recyclerView);
        // 创建适配器
        MyAdapter adapter = new MyAdapter();
        // 注册观察者
        adapter.registerObserver(this);
        recyclerView.setAdapter(adapter);
        // 设置布局管理器等
        // ...
    }

    @Override
    public void onAllViewCreated() {
        // 所有ViewHolder都创建完成时的操作
        // ...
    }
}