Android 自定义RecyclerView 水平无限轮播效果详细实例代码

下面是一个实现水平无限轮播效果的自定义RecyclerView的详细实例代码：

创建一个自定义的RecyclerViewAdapter类：

public class InfiniteAdapter extends RecyclerView.Adapter<InfiniteAdapter.ViewHolder> {
    private List<String> data;
    private LayoutInflater inflater;

    public InfiniteAdapter(Context context, List<String> data) {
        this.data = data;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.item_layout, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        int realPosition = position % data.size();
        holder.textView.setText(data.get(realPosition));
    }

    @Override
    public int getItemCount() {
        // 返回一个很大的数，以实现无限轮播
        return Integer.MAX_VALUE;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
    }
}

创建一个自定义的RecyclerViewLayoutManager类：

public class InfiniteLayoutManager extends LinearLayoutManager {
    public InfiniteLayoutManager(Context context) {
        super(context);
    }

    public InfiniteLayoutManager(Context context, int orientation, boolean reverseLayout) {
        super(context, orientation, reverseLayout);
    }

    @Override
    public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
        // 重写smoothScrollToPosition方法，实现无限轮播效果
        LinearSmoothScroller smoothScroller = new LinearSmoothScroller(recyclerView.getContext()) {
            @Override
            protected int getHorizontalSnapPreference() {
                return SNAP_TO_START;
            }
        };
        smoothScroller.setTargetPosition(position);
        startSmoothScroll(smoothScroller);
    }
}

在布局文件中添加一个RecyclerView：

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

在Activity中使用自定义的RecyclerViewAdapter和RecyclerViewLayoutManager：

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private InfiniteAdapter adapter;

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

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new InfiniteLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
        adapter = new InfiniteAdapter(this, getData());
        recyclerView.setAdapter(adapter);
    }

    private List<String> getData() {
        List<String> data = new ArrayList<>();
        data.add("Item 1");
        data.add("Item 2");
        data.add("Item 3");
        return data;
    }
}

以上代码实现了一个水平无限轮播效果的自定义RecyclerView。需要注意的是，为了实现无限轮播，Adapter的getItemCount()方法返回了一个很大的数，RecyclerViewLayoutManager的smoothScrollToPosition()方法重写了，使用了LinearSmoothScroller来实现滑动效果