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[英]fragments inside ViewPager2 are recreated when coming back to parent fragment
[英]Fragments in ViewPager not loaded when the containing Fragment is recreated
我有一個Fragment
MyFragment和一個包含更多Fragment
的ViewPager
。 它在第一次加載MyFragment時正常工作,但是如果我返回並重新創建它,則不會顯示ViewPager
中的Fragments
,因為未調用FragmentPagerAdapter.getItem
方法。
我正在使用
怎么了?
import android.app.Fragment;
import android.app.FragmentManager;
import android.support.v13.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
...
public class MyFragment extends Fragment {
private ViewPager pager;
private MyPagerAdapter adapter;
private List<Fragment> fragmentList = new ArrayList<Fragment>();
public MyFragment() {}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.my_fragment_layout, container, false);
}
public void onViewCreated(View v, Bundle savedInstanceState) {
super.onViewCreated(v, savedInstanceState);
indicators = (PagerSlidingIndicator) v.findViewById(R.id.indicators);
pager = (ViewPager) v.findViewById(R.id.pager);
Fragment fragment1 = new Fragment1();
fragmentList.add(fragment1);
Fragment fragment2 = new Fragment2();
fragmentList.add(fragment2);
Fragment fragment3 = new Fragment3();
fragmentList.add(fragment3);
adapter = new IndicatorPagerAdapter(getFragmentManager());
pager.setAdapter(adapter);
}
public class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return fragmentList.size();
}
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
}
}
如果您正在使用嵌套片段(“我有一個包含更多片段的ViewPager的片段MyFragment” getFragmentManager()
,則在設置FragmentPagerAdapter
時需要使用getChildFragmentManager()
,而不是getFragmentManager()
。
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