请教一个关于Fragment结合ViewPager懒加载,加载过渡动画统一的问题,我这样写有什么问题或者可以进一步优化吗?

public abstract class BaseFragment extends Fragment {



    private View rootView;

    protected FrameLayout frameLayout;

    protected TextView mTvTitle;

    protected TextView mTvMore;

    protected ImageView mIvBack;

    protected ImageView mIvTitle;

    protected ImageView mIvMore;

    protected Toolbar mToolbar;

    protected RelativeLayout mProgressBar;

    private Unbinder unbinder;

    private static final String TAG = "BaseFragment";



    @Nullable

    @Override

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        if (rootView != null) return rootView;  //初始化布局后就不再重复加载

        rootView = inflater.inflate(R.layout.fragment_base, container, false);

        mProgressBar=rootView.findViewById(R.id.rl_progress);

        mProgressBar.setVisibility(View.VISIBLE);

        frameLayout = rootView.findViewById(R.id.content_container);

        mToolbar = rootView.findViewById(R.id.toolbar);

        mTvTitle = rootView.findViewById(R.id.tv_title);

        mTvMore = rootView.findViewById(R.id.tv_more);

        mIvBack = rootView.findViewById(R.id.iv_back);

        mIvTitle = rootView.findViewById(R.id.iv_title);

        mIvMore = rootView.findViewById(R.id.iv_more);

        View view = View.inflate(getActivity(), getLayout(), null);

        frameLayout.addView(view);

        unbinder = ButterKnife.bind(this, view);

        initView(savedInstanceState);

        return rootView;

    }



    /**

     * 绑定布局文件

     */

    protected abstract int getLayout();



    /**

     * 初始化布局,但是不加载数据

     */

    protected abstract void initView(Bundle savedInstanceState);



    @Override

    public void onDestroy() {

        super.onDestroy();

        if (unbinder != null) {

            unbinder.unbind();

        }

    }

}

public abstract class LazyFragment extends BaseFragment {



    protected boolean isViewInitiated;  //是否初始化过布局

    protected boolean isVisibleToUser;  //当前界面是否可见

    protected boolean isDataInitiated;  //是否加载过数据

    private static final String TAG = "LazyFragment";



    @Override

    public void onActivityCreated(@Nullable Bundle savedInstanceState) {

        super.onActivityCreated(savedInstanceState);

        isViewInitiated=true;

        prepareFetchData();

    }



    @Override

    public void setUserVisibleHint(boolean isVisibleToUser) {

        super.setUserVisibleHint(isVisibleToUser);

        this.isVisibleToUser = isVisibleToUser;

        if (isVisibleToUser) {

            prepareFetchData();

        }

    }



    /**

     * 懒加载

     */

    public abstract void fetchData();



    public void prepareFetchData() {

        prepareFetchData(false);

    }



    /**

     * 判断懒加载条件,在这里访问服务器获取然后设置数据

     */

    public void prepareFetchData(boolean forceUpdate) {

        if (isVisibleToUser && isViewInitiated && (!isDataInitiated || forceUpdate)) {

            mProgressBar.setVisibility(View.GONE); //隐藏加载进度

            fetchData();

            isDataInitiated = true;

        }

    }



    @Override

    public void onDetach() {

        super.onDetach();

        isDataInitiated = false;

    }

}

public class FragmentA extends LazyFragment {



    @BindView(R.id.tv_a)

    TextView mTextView;



    @Override

    protected void initView( Bundle savedInstanceState) {

        mTextView.setText("11111111111111111");

    }



    @Override

    protected int getLayout() {

        return R.layout.fragment_a;

    }



    @Override

    public void fetchData() {



    }

}