android项目之懒加载一种实现方式

实现fragement懒加载

public class CultureFragment extends BaseFragment {
    public boolean isLoaded=false;
    ******************************
    private boolean isDataLoaded = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRetainInstance(true); // 保持实例
    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        if (null != mView) {
            ViewGroup parent = (ViewGroup) mView.getParent();
            if (null != parent) {
                parent.removeView(mView);
            }
        } else {
            mView = inflater.inflate(R.layout.fragment_culture, container, false);
            //initView(mView);
        }
        return mView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (isVisible()) {
            loadData(); // 加载数据
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        if (!isDataLoaded && isVisible()) {
            loadData(); // 加载数据
        }
    }

    private void loadData() {
        // 在这里执行数据加载操作（例如从网络或数据库获取数据）
        // 当数据准备好时：
        getData(page,tabId);
        isDataLoaded = true; // 设置数据已加载标志
        updateUI(); // 更新UI元素
    }

    private void updateUI() {
       ************************************

        smartRefreshLayout.setOnMultiPurposeListener(new SimpleMultiPurposeListener(){
            @Override
            public void onRefresh(@NonNull RefreshLayout refreshLayout) {
                super.onRefresh(refreshLayout);
                page=1;
                getData(page,tabId);
                recyclerView.smoothScrollToPosition(0);//回到顶部
                smartRefreshLayout.finishRefresh(2000);
            }
            @Override
            public void onLoadMore(@NonNull RefreshLayout refreshLayout) {
                super.onLoadMore(refreshLayout);
                //获取试图总条目
                page++;
                getData(page,tabId);
                smartRefreshLayout.finishLoadMore(2000);
            }

        });

        //初始化titles数据

      *****************************

        intTab();
        initAdapter();
    }

    @MainThread
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         initView();

         //initAdapter();
    }

    private void initView() {


    }

    private void intTab(){

        Set set=titles.keySet();
        Object[] arr=set.toArray();
        Arrays.sort(arr);
        for(Object key:arr){
            //System.out.println(key);
            tabLayout.addTab(tabLayout.newTab().setText(titles.get(key)));

        }

        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener(){

            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                pos=tab.getPosition();
                page=1;
                tabId= (Integer) StringUtils.getKey(titles,tab.getText());
                getData(page,tabId);
                //Toast.makeText(activity,"点击了我："+tab.getPosition(),Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });
    }

    private void initAdapter(){
       ************************略
    }


    private void getData(int pages,int catId){
        HttpRequest.culturelist((LifecycleOwner) activity, pages,catId, new CallBackLis<List<CultureBean>>() {
            @Override
            public void onSuccess(String method, List<CultureBean> content) {
                ******************lue
            }
            @Override
            public void onFailure(String method, String error) {
                Toast.makeText(activity, error, Toast.LENGTH_SHORT).show();
            }
        });
    }


}