RecyclerView Adapter方法未被调用 [英] RecyclerView Adapter Methods not being called
本文介绍了RecyclerView Adapter方法未被调用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
未调用我的RecyclerView适配器的方法.
My RecyclerView's Adapter's methods are not being called.
- 仅调用
getItemCount()
和类Constructor(列表不是 空的,我已经检查过了.) - 未调用方法
onCreateViewHolder()
和onBindViewHolder()
. - 我在同一活动中有其他片段,使用的片段几乎相同 程序,但是它们工作得很好.
- 我尝试创建一个新的Adapter类,但这也没有用.
- 方法
getItemCount()
被调用2次 - 我为2个不同的recyclerViews使用相同的XML文件作为Adapter View,并且它们都工作正常.
- Only
getItemCount()
and class Constructor are called (List is not empty, i have checked that). - Methods
onCreateViewHolder()
andonBindViewHolder()
are not called. - I have Other fragments in the same activity, using nearly same procedure but they are working perfectly fine.
- I tried creating a new Adapter class but that also didn't work.
- Method
getItemCount()
is called 2 times - I am using same XML file for Adapter View for 2 different recyclerViews and they both are working fine.
我的适配器类
public class OfflineAdapter extends RecyclerView.Adapter<OfflineAdapter.OfflineHolder>{
private Context context;
private List<MovieDBObject> list;
public class OfflineHolder extends RecyclerView.ViewHolder {
@BindView(R.id.movie_grid_imageView)
ImageView imageView;
public OfflineHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
Log.i("bitmap", String.valueOf(4));
}
}
public OfflineAdapter (Context context, List<MovieDBObject> list) {
this.context = context;
this.list = list;
Log.i("bitmap", String.valueOf(1));
}
@Override
public OfflineHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.movie_grid_imageview, parent, false);
Log.i("bitmap", String.valueOf(3));
return new OfflineHolder(view);
}
@Override
public void onBindViewHolder(OfflineHolder holder, int position) {
MovieDBObject object = list.get(position);
holder.imageView.setImageBitmap(object.getPoster());
Log.i("bitmap", String.valueOf(5));
}
@Override
public int getItemCount() {
Log.i("bitmap", String.valueOf(2));
return list.size();
}
}
片段调用RecyclerView
Fragment Calling RecyclerView
public class FavouriteMovies extends Fragment{
@BindView(R.id.favourite_movies_recyclerView)
RecyclerView recyclerView;
List<MovieDBObject> list = new ArrayList<>();
MovieDBHelper movieDBHelper;
OfflineAdapter offlineAdapter;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_fav_movies, container, false);
ButterKnife.bind(this, rootView);
movieDBHelper = ((MainActivity)getActivity()).dbHelper;
final GridLayoutManager layoutManager = new GridLayoutManager(getContext(), 2);
offlineAdapter = new OfflineAdapter(getContext(), list);
recyclerView.setAdapter(offlineAdapter);
recyclerView.setLayoutManager(layoutManager);
recyclerView.hasFixedSize();
recyclerView.setItemAnimator(new DefaultItemAnimator());
prepareList();
return rootView;
}
private void prepareList(){
list = movieDBHelper.getAllMovies();
Log.i("bitmap", list.size()+"");
offlineAdapter.notifyDataSetChanged();
}
}
片段的XML文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="HELLO"/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/favourite_movies_recyclerView"/>
</LinearLayout>
AdapterView的XML文件
XML File for the AdapterView
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/movie_grid_imageView"/>
</RelativeLayout>
推荐答案
在OfflineAdapter
中创建一个新方法来设置更新数据示例:
In OfflineAdapter
create a new method to set update data example:
private void updateData(List<MovieDBObject> dataList){
this.list = dataList;
}
然后更新prepareList
private void prepareList(){
list = movieDBHelper.getAllMovies();
Log.i("bitmap", list.size()+"");
offlineAdapter.updateData(list);
offlineAdapter.notifyDataSetChanged();
}
那可以解决您的问题
这篇关于RecyclerView Adapter方法未被调用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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