1、首先，确保您已经添加了BaseQuickAdapter和RecyclerView的依赖项。您可以在项目的build.gradle文件中添加以下依赖项：

dependencies {implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.4'implementation 'androidx.recyclerview:recyclerview:1.2.1'
}

2、创建一个数据模型类来表示每个列表项的数据。例如，假设您有一个名为Item的数据类：

public class Item {private String name;private boolean isSelected;public Item(String name) {this.name = name;this.isSelected = false;}public String getName() {return name;}public boolean isSelected() {return isSelected;}public void setSelected(boolean selected) {isSelected = selected;}
}

3、创建一个Adapter类，继承自BaseQuickAdapter<Item, BaseViewHolder>。在Adapter中，您需要处理单选逻辑以及默认选择第一个项的逻辑：

public class ItemAdapter extends BaseQuickAdapter<Item, BaseViewHolder> {public ItemAdapter(@Nullable List<Item> data) {super(R.layout.item_layout, data);}@Overrideprotected void convert(BaseViewHolder helper, Item item) {helper.setText(R.id.text_view, item.getName());// 设置选中状态的背景色if (item.isSelected()) {helper.itemView.setBackgroundColor(ContextCompat.getColor(mContext, R.color.selected_color));} else {helper.itemView.setBackgroundColor(Color.TRANSPARENT);}}public void setItemSelected(int position) {for (int i = 0; i < getData().size(); i++) {getData().get(i).setSelected(i == position);}notifyDataSetChanged();}
}

4、在您的Activity或Fragment中，初始化RecyclerView和Adapter，并设置默认选择第一个项：

public class MainActivity extends AppCompatActivity {private RecyclerView recyclerView;private ItemAdapter adapter;private List<Item> itemList = new ArrayList<>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);recyclerView = findViewById(R.id.recycler_view);recyclerView.setLayoutManager(new LinearLayoutManager(this));// 初始化数据for (int i = 0; i < 10; i++) {itemList.add(new Item("Item " + (i + 1)));}// 创建Adapter并设置默认选中第一个项adapter = new ItemAdapter(itemList);adapter.setItemSelected(0);recyclerView.setAdapter(adapter);// 设置RecyclerView的点击事件adapter.setOnItemClickListener((adapter, view, position) -> {adapter.setSelected(position);});}
}