ViewPager使用FragmentPagerAdapter滑动Fragment动态加载Atlas bundle不显示问题

问题描述

ViewPager使用FragmentPagerAdapter滑动Fragment，然后通过Atlas插件化框架在Fragment的onCreateView中动态加载bundle，发现只显示第一个bundle，往后滑动ViewPager，能够正常加载Fragment，但不能显示Fragment的挂载的bundle。

这是FragmentPagerAdapter的加载机制引起的，为了让客户有更好的体验，当我们使用ViewPager显示一个Fragment的时候，FragmentPagerAdapter会自动加载其两侧的Fragment。

FragmentPagerAdapter fragmentPagerAdapter = new FragmentPagerAdapter(getSupportFragmentManager()) {
    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }
};
mViewPager.setAdapter(fragmentPagerAdapter);
mViewPager.setOffscreenPageLimit(5);
mViewPager.addOnPageChangeListener(this);

@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_home, container, false);
    initDelegate(view, savedInstanceState);
    return view;
}

private void initDelegate(View view, Bundle savedInstanceState) {
    mActivityDelegate = new ActivityGroupDelegate(getActivity(), savedInstanceState);
    mActivityGroupContainer = (ViewGroup) view.findViewById(R.id.content);
    if (getActivity() != null) {
        AtlasDelegateHelper.switchToActivity(getActivity(), mActivityDelegate, mActivityGroupContainer,
                "home", "cn.appblog.home.ui.activity.HomeActivity");
    }
}

解决方法

复写Fragment的setUserVisibleHint方法，在Fragment显示时动态加载

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser && getActivity() != null) {
        AtlasDelegateHelper.switchToActivity(getActivity(), mActivityDelegate, mActivityGroupContainer,
                "home", "cn.appblog.home.ui.activity.HomeActivity");
    }
}