使用ListAdapter时，仅在重新启动活动后应用ItemDecoration

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ListAdapter listAdapter;
    private ItemDecoration itemDecoration;

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

        // 初始化RecyclerView和ListAdapter
        recyclerView = findViewById(R.id.recyclerView);
        listAdapter = new ListAdapter();

        // 初始化ItemDecoration
        itemDecoration = new MyItemDecoration();

        // 设置RecyclerView的布局管理器和适配器
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(listAdapter);
    }

    @Override
    protected void onResume() {
        super.onResume();
        
        // 在重新启动活动后应用ItemDecoration
        recyclerView.addItemDecoration(itemDecoration);
    }

    @Override
    protected void onPause() {
        super.onPause();
        
        // 在活动暂停时移除ItemDecoration，避免重复应用
        recyclerView.removeItemDecoration(itemDecoration);
    }
}