BaseLoadDataForNetFragment

/**
 * 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();

}

fragment中请求网络。。

子fagnment 复用已经加载的数据

@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;
    }