RecyclerView上的空视图

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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" />

    <LinearLayout
        android:id="@+id/emptyView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center"
        android:visibility="gone">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_empty" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="No data available"
            android:textSize="18sp" />
    </LinearLayout>
</RelativeLayout>

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private LinearLayout emptyView;
    private MyAdapter adapter;
    private List<MyData> dataList = new ArrayList<>();

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

        recyclerView = findViewById(R.id.recyclerView);
        emptyView = findViewById(R.id.emptyView);

        adapter = new MyAdapter(dataList);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(adapter);

        // 模拟数据加载
        loadData();
    }

    private void loadData() {
        // 假设这里是从网络或数据库获取数据
        dataList.clear();
        boolean hasData = false; // 模拟数据加载结果

        if (hasData) {
            dataList.addAll(getMockData());
            adapter.notifyDataSetChanged();
            recyclerView.setVisibility(View.VISIBLE);
            emptyView.setVisibility(View.GONE);
        } else {
            recyclerView.setVisibility(View.GONE);
            emptyView.setVisibility(View.VISIBLE);
        }
    }

    private List<MyData> getMockData() {
        // 返回模拟数据
        return Arrays.asList(new MyData(), new MyData());
    }
}