RecyclerView的简单使用

添加RecyclerView控件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

设置RecyclerView

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RecyclerView recyclerView = findViewById(R.id.recyclerview);
        recyclerView.setLayoutManager(new LinearLayoutManager(this, RecyclerView.VERTICAL,false));    // 垂直布局
        recyclerView.setAdapter(new RecyclerAdapter());
    }
}

编写RecyclerAdapter

class RecyclerAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {
    private List<String> data = new ArrayList<>();

    RecyclerAdapter() {
        super();
        // 生成测试数据
        for (int i = 0; i < 10; ++i) {
            data.add("item" + (i + 1));
        }
    }

    @NonNull
    @Override
    public RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // 创建ViewHolder
        return new RecyclerViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view_item, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerViewHolder holder, int position) {
        // 绑定数据
        holder.update(data.get(position));
    }

    @Override
    public int getItemCount() {
        return data.size();
    }
}

编写RecyclerViewHolder

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

class RecyclerViewHolder extends RecyclerView.ViewHolder {
    TextView textView;

    public RecyclerViewHolder(@NonNull View itemView) {
        super(itemView);
        textView = itemView.findViewById(R.id.textview);
    }

    public void update(String content) {
        // 展示内容
        textView.setText(content);
    }
}