我遇到了一个问题，我有一个片段，其中包含一个处理3个子片段的标签布局/视图寻呼机，当我第一次打开主片段时，子片段中的所有数据都正确显示，但是当我再次重新打开主片段（单击一个单独的listview项目）时，数据不会正确填充（即使它存在）。
我还注意到，子片段获取数据的唯一时间是查看分页到最后一个选项卡或旋转屏幕时。此外，当我尝试使用视图寻呼机将屏幕向右移动时，标签指示器将卡在第一个和第二个标签之间的中间位置。
我该怎么做才能解决这个问题？
片段适配器
public class DetailFragmentPagerAdapter extends FragmentPagerAdapter {
Context context;
final int PAGE_COUNT = 3;
private String tabTitles[] = new String[] { "Plot", "Trailers", "Reviews" };
private Movie movie;
public DetailFragmentPagerAdapter(FragmentManager fm, Context context, Movie movie) {
super(fm);
this.context = context;
this.movie = movie;
}
@Override
public Fragment getItem(int position) {
if(position == 0){
return PlotFragment.newInstance(movie);
} else if (position == 1){
return TrailerFragment.newInstance();
} else if (position == 2){
return ReviewFragment.newInstance();
} else {
Log.e("RETURNING NULL", "RETURNING NULL");
return null;
}
}
@Override
public int getCount() {
return PAGE_COUNT;
}
@Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
}
主要片段
public class MovieItemDetailFragment extends Fragment implements View.OnClickListener {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
public String TAG = MovieItemDetailFragment.class.getCanonicalName();
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
private View view;
private TextView tvTitle, tvReleaseDate, tvRating;
private ImageView ivMoviePoster;
private Movie movie;
private Handler handler;
private Button btnFavorite;
private boolean isFavorited = false;
private View.OnClickListener mOnClickListener;
private ViewPager viewpager;
private TabLayout tablayout;
private DetailFragmentPagerAdapter adapter;
// TODO: Rename and change types and number of parameters
public static MovieItemDetailFragment newInstance(String param1, String param2) {
MovieItemDetailFragment fragment = new MovieItemDetailFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public MovieItemDetailFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_movie_item_detail, container, false);
init();
return view;
}
private void init() {
handler = new Handler();
this.movie = (Movie) getArguments().getSerializable("MOVIE");
tvTitle = (TextView) view.findViewById(R.id.tvTitle);
tvReleaseDate = (TextView) view.findViewById(R.id.tvReleaseDate);
tvRating = (TextView) view.findViewById(R.id.tvAvgRating);
ivMoviePoster = (ImageView) view.findViewById(R.id.ivMoviePoster);
btnFavorite = (Button) view.findViewById(R.id.btnFavorite);
btnFavorite.setOnClickListener(this);
viewpager = (ViewPager) view.findViewById(R.id.pager);
tablayout = (TabLayout) view.findViewById(R.id.sliding_tabs);
adapter = new DetailFragmentPagerAdapter(getActivity().getSupportFragmentManager(),
getActivity(), getMovie());
viewpager.setAdapter(adapter);
adapter.notifyDataSetChanged();
tablayout.post(new Runnable() {
@Override
public void run() {
tablayout.setupWithViewPager(viewpager);
}
});
mOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
isFavorited = true;
btnFavorite.setBackground(getActivity().getResources().getDrawable(R.drawable.favorite_content_selector));
}
};
setElementValues();
}
private void setElementValues() {
handler.post(new Runnable() {
@Override
public void run() {
tvTitle.setText(getMovie().getTitle());
tvReleaseDate.setText(getMovie().getRelease_date());
tvRating.setText(String.valueOf(getMovie().getVote_average()));
Picasso.with(getActivity()).load(getMovie().getFull_poster_path()).into(ivMoviePoster);
if (isFavorited) {
btnFavorite.setBackground(getActivity().getResources().getDrawable(R.drawable.favorite_content_selector));
} else {
btnFavorite.setBackground(getActivity().getResources().getDrawable(R.drawable.favorite_blank_content_selector));
}
}
});
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnFavorite:
if (isFavorited) {
isFavorited = false;
btnFavorite.setBackground(getActivity().getResources().getDrawable(R.drawable.favorite_blank_content_selector));
showSnackbar("I thought that was one of your favorites.");
} else {
isFavorited = true;
btnFavorite.setBackground(getActivity().getResources().getDrawable(R.drawable.favorite_content_selector));
}
break;
}
}
private void showSnackbar(String msg) {
Snackbar
.make(view, msg, Snackbar.LENGTH_LONG)
.setAction(R.string.snackbar_action, mOnClickListener)
.setActionTextColor(getActivity().getResources().getColor(R.color.material_yellow_400))
.show();
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
public Movie getMovie() {
return movie;
}
}
答案 0 :(得分：3)
而不是打电话
adapter = new DetailFragmentPagerAdapter(getActivity().getSupportFragmentManager(), getActivity(), getMovie());
尝试：
adapter = new DetailFragmentPagerAdapter(getChildFragmentManager(), getActivity(), getMovie());
答案 1 :(得分：0)
这对我也有用。
基本上，区别在于Fragment现在具有自己的内部 FragmentManager ，可以处理Fragment。子 FragmentManager 是仅处理添加到其中的Fragment中包含的Fragment的子对象。另一个 FragmentManager 包含在整个活动中。
有关 getChildFragmentManager（）的更多详细信息 访问此问题
[What is difference between getSupportFragmentManager() and getChildFragmentManager()?