Android: RecyclerView: No adapter attached; skipping layout

问题:

I keep getting the error "RecyclerView: No adapter attached; skipping layout" when the RecyclerView list is shown. I have 3 tabs and one tab has a RecyclerView list that is populated from SQLite database. I don't get any crashes and the data is shown correctly in the view but I still get this error.

I thought it was just a warning because the data is in place correctly but when I tried onClick it doesn't work and I'm sure it has something to do with this error.

I know this question has been asked a lot before but I checked most of the questions and none has worked for me.

This is my fragment:

public class RecentsFragment extends Fragment {     DatabaseHelper helper;     List<MyPojo> dbList;     RecyclerView mRecyclerView;     private MyGridAdapter mAdapter;     @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {          final View view = inflater.inflate(R.layout.my_recents_list, container, false);         mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);         mRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));         mRecyclerView.setHasFixedSize(true);         return view;     }     @Override     public void onViewCreated(View view, Bundle savedInstanceState) {         super.onViewCreated(view, savedInstanceState);          setHasOptionsMenu(true);         dbList = new ArrayList<MyPojo>();          dbList = getCat(); // getCat returns array list from sqlite database          mAdapter = new MyGridAdapter(dbList);         mRecyclerView.setAdapter(mAdapter);      } } 

My adapter:

public class MyGridAdapter extends RecyclerView.Adapter<MyGridAdapter.ViewHolder> {      static List<MyPojo> dbList;     static Context context;      MyGridAdapter(Context context, List<MyPojo> dbList){         this.dbList = new ArrayList<MyPojo>();         this.context = context;         this.dbList = dbList;      }       MyGridAdapter(List<MyPojo> dbList){         this.dbList = new ArrayList<MyPojo>();         this.dbList = dbList;      }      @Override     public MyGridAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {          View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(                 R.layout.categories_item, null);          ViewHolder viewHolder = new ViewHolder(itemLayoutView);         return viewHolder;     }      @Override     public void onBindViewHolder(final MyGridAdapter.ViewHolder holder, int position) {          holder.title.setText(dbList.get(position).getCat());     }      @Override     public int getItemCount() {         return dbList.size();     }      public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {          public TextView title;         public LinearLayout placeHolder;         ImageView image;          public ViewHolder(View itemLayoutView) {             super(itemLayoutView);             title = (TextView) itemLayoutView.findViewById(R.id.placeName);          }          @Override         public void onClick(View v) {             Intent intent = new Intent(context, DetailsActivity.class);              Bundle extras = new Bundle();             extras.putInt("catid", dbList.get(getAdapterPosition()).getCatid());             intent.putExtras(extras);              context.startActivity(intent);          }     } } 

Thanks in advance

Update: my_recents_list.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     tools:context=".RecentsFragment">       <android.support.v7.widget.RecyclerView         android:id="@+id/recyclerView"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:background="#f8f8f8"         android:divider="@null"         android:listSelector="@android:color/transparent"/>  </LinearLayout> 

回答1:

To avoid this error, avoid to do the findViewById into the CreateView method but instead do it into the onViewCreated.

@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {      return inflater.inflate(R.layout.my_recents_list, container, false); }  @Override public void onViewCreated(View view, Bundle savedInstanceState) {     super.onViewCreated(view, savedInstanceState);      mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);     mRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));     mRecyclerView.setHasFixedSize(true);      setHasOptionsMenu(true);     dbList = new ArrayList<MyPojo>();      dbList = getCat(); // getCat returns array list from sqlite database      mAdapter = new MyGridAdapter(getActivity(), dbList);     mRecyclerView.setAdapter(mAdapter);  } 

Edit

You Adapter should be like:

public class MyGridAdapter extends RecyclerView.Adapter<MyGridAdapter.ViewHolder> {      private List<MyPojo> dbList;     private Context context;      MyGridAdapter(Context context, List<MyPojo> dbList) {         this.dbList = new ArrayList<MyPojo>(dbList);         this.context = context;     }      @Override     public MyGridAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {         // Note that the inflate method takes the layout to inflate, the parent to measure          // the layout and the third parameters is false so only this view will handle events like click event         View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.categories_item, parent, false);          return new ViewHolder(itemLayoutView);     }      @Override     public void onBindViewHolder(final MyGridAdapter.ViewHolder holder, final int position) {         MyPojo myPojo = dbList.get(position);         holder.title.setText(myPojo.getCat());         //You can register the click listener to the textview (or the whole item if you put it into the holder)         holder.title.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 Intent intent = new Intent(context, DetailsActivity.class);              Bundle extras = new Bundle();             extras.putInt("catid", dbList.get(position).getCatid());             intent.putExtras(extras);              context.startActivity(intent);             }         });     }      @Override     public int getItemCount() {         return dbList.size();     }      //The class is static to avoid leaks from a non-static nested class     public static class ViewHolder extends RecyclerView.ViewHolder {          public TextView title;          public ViewHolder(View itemLayoutView) {             super(itemLayoutView);             title = (TextView) itemLayoutView.findViewById(R.id.placeName);          }     } } 

文章来源: Android: RecyclerView: No adapter attached; skipping layout