安卓开发 原生View 帮我写完整代码 垂直recyclerview 嵌套水平recyclerview

好的，下面是一个垂直的 RecyclerView 嵌套水平的 RecyclerView 的完整代码：

在布局文件中添加以下代码：

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

在 Java 文件中添加以下代码：

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;

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

        mRecyclerView = findViewById(R.id.verticalRecyclerView);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        mRecyclerView.setAdapter(new VerticalAdapter());
    }

    private class VerticalAdapter extends RecyclerView.Adapter<VerticalAdapter.VerticalViewHolder> {
        @NonNull
        @Override
        public VerticalViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_vertical, parent, false);
            return new VerticalViewHolder(view);
        }

        @Override
        public void onBindViewHolder(@NonNull VerticalViewHolder holder, int position) {
            holder.mHorizontalRecyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL, false));
            holder.mHorizontalRecyclerView.setAdapter(new HorizontalAdapter());
        }

        @Override
        public int getItemCount() {
            return 10;
        }

        class VerticalViewHolder extends RecyclerView.ViewHolder {
            RecyclerView mHorizontalRecyclerView;

            VerticalViewHolder(@NonNull View itemView) {
                super(itemView);
                mHorizontalRecyclerView = itemView.findViewById(R.id.horizontalRecyclerView);
            }
        }
    }

    private class HorizontalAdapter extends RecyclerView.Adapter<HorizontalAdapter.HorizontalViewHolder> {
        @NonNull
        @Override
        public HorizontalViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_horizontal, parent, false);
            return new HorizontalViewHolder(view);
        }

        @Override
        public void onBindViewHolder(@NonNull HorizontalViewHolder holder, int position) {
            holder.mTextView.setText(String.valueOf(position + 1));
        }

        @Override
        public int getItemCount() {
            return 5;
        }

        class HorizontalViewHolder extends RecyclerView.ViewHolder {
            TextView mTextView;

            HorizontalViewHolder(@NonNull View itemView) {
                super(itemView);
                mTextView = itemView.findViewById(R.id.textView);
            }
        }
    }
}

在 res/layout/ 目录下创建以下布局文件：

activity_main.xml：

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

item_vertical.xml：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/horizontalRecyclerView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" />

item_horizontal.xml：

<TextView
    android:id="@+id/textView"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:background="@color/colorAccent"
    android:gravity="center"
    android:textColor="@android:color/white" />

这样就完成了一个垂直的 RecyclerView 嵌套水平的 RecyclerView。