[英]ArrayAdapter not updating with notifyDataSetChanged()
我有一個 ListView,我用 ArrayList 填充它工作正常,但是當我用新項目清除並重新填充 ArrayList 並調用 notifyDataSetChanged() 時,永遠不會調用適配器的 getView() 並且 ListView 不會反映新的數據。 不知道我哪里出錯了,但感謝任何幫助! 謝謝
初始化視圖和適配器
Arraylist<Movie> moviesArray = new Arraylist<>();
movieListView = view.findViewById(R.id.movie_list_view);
movieListAdapter = new MovieListArrayAdapter(this, requireContext(), R.layout.list_item, moviesArray);
movieListView.setAdapter(movieListAdapter);
要求新數據
moviesArray.clear()
moviesViewModel.GetMovies();
觀察結果(我的 BottomSheet 得到更新,所以我知道我正在接收數據)
moviesViewModel.getMoviesResult().observe(getViewLifecycleOwner(), new Observer<MovieList>() {
@Override
public void onChanged(MovieList movieList) {
if (movieList!=null) {
moviesArray.addAll(movieList.getResults());
movieListAdapter.notifyDataSetChanged();
}
UpdateBottomSheet(view, 0);
}
});
適配器(更新列表數據時未調用 getView)
public class MovieListArrayAdapter extends ArrayAdapter<Movie> {
Fragment fragment;
List<Movie> movies;
public MovieListArrayAdapter(Fragment fragment, @NonNull Context context, int resource, @NonNull List<Movie> movies) {
super(context, resource, movies);
this.fragment = fragment;
this.movies = movies;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
Movie movie = movies.get(position);
Movie top_movie = movies.get(0);
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
}
ImageView movie_imageview = convertView.findViewById(R.id.list_item_image);
if (movie==top_movie) {
convertView.setVisibility(View.VISIBLE);
Glide.with(fragment.requireContext()).load(movie.getImage()).into(movie_imageview);
} else {
convertView.setVisibility(View.GONE);
}
return convertView;
}
您需要更新適配器中的列表。
movieListAdapter.addAll(movieList.getResults());
movieListAdapter.notifyDataSetChanged();
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