fragment懒加载问题

public class LazyBaseFragment extends BasePermissionFragment {
    private boolean mHasLoadedOnce = false;
//子类重写该方法 进行懒加载
    public void onLazyLoad() {
    }


    private boolean isLazy;

    /**
     * 请用viewPager第1个fragment 调用
     */
    public LazyBaseFragment startLazyMode() {
        isLazy = true;
        return this;
    }

	//这个方法会多次调用 在onAttach之前 调用两次setUserVisibleHint(false) setUserVisibleHint(true) 显示隐藏的时候

也就是 fragment切换的时候 都会调用 当切走的时候 setUserVisibleHint(false) 当切回来的时候 setUserVisibleHint(true)
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {

	//this.isVisible 一定要写  不然 在onCreate之前调用 如果有实用当前fragment 中 view 会报空指针

	Return true if the fragment is currently visible to the user.  This means
	* it: (1) has been added, (2) has its view attached to the window, and 
	* (3) is not hidden.

if ( this.isVisible()) {

		if (isVisibleToUser && !mHasLoadedOnce) {              

			  mHasLoadedOnce = true;              

			  onLazyLoad();            

			}        

		}       

		 super.setUserVisibleHint(isVisibleToUser);   

	}    

	@Override    

	public void onActivityCreated(Bundle savedInstanceState) {       

		 if (isLazy)            

		setUserVisibleHint(isLazy);        

		super.onActivityCreated(savedInstanceState);    

	}}