BaseFragment 延迟加载lazyload

 public abstract class BaseFragment extends Fragment{
    protected View mContentView;
    protected AppController mApp;
    /**
     * 视图是否已经初初始化
     */
    protected boolean isInit = false;
    protected boolean isLoad = false;
    protected final String TAG = "LazyLoadFragment";


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        mApp=AppController.getInstance();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        isInit = false;
        isLoad = false;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        // 避免多次从xml中加载布局文件
        if (mContentView == null) {
            initView(savedInstanceState);
            setListener();
            processLogic(savedInstanceState);
            isInit = true;
            /**初始化的时候去加载数据**/
            isCanLoadData();
        } else {
            ViewGroup parent = (ViewGroup) mContentView.getParent();
            if (parent != null) {
                parent.removeView(mContentView);
            }
        }
        return mContentView;
    }



    /**
     * 视图是否已经对用户可见，系统的方法
     */
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        isCanLoadData();
    }

    /**
     * 是否可以加载数据
     * 可以加载数据的条件：
     * 1.视图已经初始化
     * 2.视图对用户可见
     */
    private void isCanLoadData() {
        if (!isInit) {
            return;
        }

        if (getUserVisibleHint()) {
            lazyLoad();
            isLoad = true;
        } else {
            if (isLoad) {
                stopLoad();
            }
        }
    }

    protected void setContentView(@LayoutRes int layoutResID, Activity activity) {
        mContentView = LayoutInflater.from(activity).inflate(layoutResID, null);
    }

    protected void setContentView(@LayoutRes int layoutResID) {
        mContentView = LayoutInflater.from(mApp).inflate(layoutResID, null);
    }

    protected abstract void initView(Bundle savedInstanceState);

    protected abstract void setListener();

    protected abstract void processLogic(Bundle savedInstanceState);

    protected void ShowToast(String text){
        ToastUtil.show(text);
    }

    /**
     * 查找View
     *
     * @param id   控件的id
     * @param <VT> View类型
     * @return
     */
    protected <VT extends View> VT getViewById(@IdRes int id) {
        return (VT) mContentView.findViewById(id);
    }

    /**
     * 当视图初始化并且对用户可见的时候去真正的加载数据
     */
    protected abstract void lazyLoad();

    /**
     * 当视图已经对用户不可见并且加载过数据，如果需要在切换到其他页面时停止加载数据，可以覆写此方法
     */
    protected void stopLoad() {
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }
}

@Override
    protected void lazyLoad() {
        if (!isLoad) {
            isLoad = true;
        }
    }