/** * Fragment 加载网络请求 */public abstract class BaseLoadDataForNetFragment extends Fragment {    // 视图是否初始化完成    protected boolean isViewInitiated;    // 界面是否可见    protected boolean isVisibleToUser;    // 数据是否加载    protected boolean isDataInitiated;    @Override    public void onActivityCreated(Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);        isViewInitiated = true;        prepareFetchData();    }    @Override    public void setUserVisibleHint(boolean isVisibleToUser) {        super.setUserVisibleHint(isVisibleToUser);        this.isVisibleToUser = isVisibleToUser;        prepareFetchData();    }    private void prepareFetchData() {        // 不设置为需要每次可见的时候都强制刷新界面        prepareFetchData(false);    }    /**     * 设置true，可强制刷新界面     *     * @param forceUpdate 是否强制刷新界面     * @return     */    protected void prepareFetchData(boolean forceUpdate) {        if (isVisibleToUser && isViewInitiated && (!isDataInitiated || forceUpdate)) {            fetchDataForNet();            isDataInitiated = true;        }    }    /**     * 刷新数据，网络刷新数据     */    public abstract void fetchDataForNet();}

@Nullable    @Override    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        WLog.d("onCreateView");        View mView = inflater.inflate(R.layout.fragment_my_order, container, false);        mNoDataTV = (TextView) mView.findViewById(R.id.fragment_order_tv_no_data);        mShowLoading = (LinearLayout) mView.findViewById(R.id.fragment_order_ll_loading);        // 子界面可以重用网络加载的数据        if (isDataInitiated) {            WLog.d("数据已经加载过...无需再次请求数据");            //mShowLoading.setVisibility(View.GONE);            //mNoDataTV.setVisibility(View.VISIBLE);        }        return mView;    }