从菜单更新RecyclerView

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/menu_refresh"
        android:title="刷新"
        android:orderInCategory="100"
        android:showAsAction="always" />
</menu>

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private RecyclerViewAdapter adapter;
    private List<String> dataList;

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

        // 初始化RecyclerView和数据源
        recyclerView = findViewById(R.id.recyclerView);
        dataList = new ArrayList<>();
        adapter = new RecyclerViewAdapter(dataList);
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        // 其他初始化操作...

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.menu_refresh) {
            // 点击刷新菜单项时，更新RecyclerView数据源
            updateRecyclerViewData();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void updateRecyclerViewData() {
        // 根据业务需求更新数据源
        // ...

        // 刷新RecyclerView
        adapter.notifyDataSetChanged();
    }
}