ListView與RecyclerView在Fragment懶加載中的應(yīng)用

在Fragment中實(shí)現(xiàn)懶加載功能通常需要在Fragment的生命周期方法中進(jìn)行一些判斷和操作。ListView和RecyclerView是常用的列表控件，它們?cè)贔ragment中的懶加載實(shí)現(xiàn)方式也有一些區(qū)別。

對(duì)于ListView，可以在Fragment的onCreateView方法中初始化ListView，并在onResume方法中加載數(shù)據(jù)。具體實(shí)現(xiàn)可以參考以下代碼示例：

public class MyFragment extends Fragment {

    private ListView listView;
    private MyAdapter adapter;
    private List<String> dataList;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);

        listView = view.findViewById(R.id.listView);
        dataList = new ArrayList<>();
        adapter = new MyAdapter(dataList);
        listView.setAdapter(adapter);

        return view;
    }

    @Override
    public void onResume() {
        super.onResume();

        loadData();
    }

    private void loadData() {
        // 模擬加載數(shù)據(jù)
        for (int i = 0; i < 10; i++) {
            dataList.add("Item " + i);
        }
        adapter.notifyDataSetChanged();
    }
}

對(duì)于RecyclerView，可以在Fragment的onCreateView方法中初始化RecyclerView，并在onResume方法中設(shè)置RecyclerView的布局管理器和適配器，然后在加載數(shù)據(jù)。具體實(shí)現(xiàn)可以參考以下代碼示例：

public class MyFragment extends Fragment {

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);

        recyclerView = view.findViewById(R.id.recyclerView);
        dataList = new ArrayList<>();
        adapter = new MyAdapter(dataList);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerView.setAdapter(adapter);

        return view;
    }

    @Override
    public void onResume() {
        super.onResume();

        loadData();
    }

    private void loadData() {
        // 模擬加載數(shù)據(jù)
        for (int i = 0; i < 10; i++) {
            dataList.add("Item " + i);
        }
        adapter.notifyDataSetChanged();
    }
}

在以上示例中，ListView和RecyclerView的懶加載實(shí)現(xiàn)方式基本相同，都是在onResume方法中加載數(shù)據(jù)。需要注意的是，數(shù)據(jù)加載的操作應(yīng)該盡量放在子線程中進(jìn)行，以避免阻塞主線程。