偶遇一個不錯的懶加載fragment實現(xiàn)，僅記錄。

public abstract class LazyFragment extends BaseFragment {

    protected boolean isViewInitiated; //控件是否初始化完成
    protected boolean isVisibleToUser; //頁面是否可見
    protected boolean isDataInitiated; //數(shù)據(jù)是否加載


    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        this.isVisibleToUser = isVisibleToUser;
        prepareFetchData(false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        isViewInitiated = true;
        prepareFetchData(false);
    }

    public abstract void loadData();


    protected void prepareFetchData(boolean forceUpdate) {
        if (isVisibleToUser && isViewInitiated && (!isDataInitiated || forceUpdate)) {
            loadData();
            isDataInitiated = true;
        }
    }
}