RecyclerView Adapter Methoden nicht genannt

Question

Ich habe dieses seltsame Problem mit meinem Adapter, dass keine Methoden aufgerufen werden .. Der Konstruktor funktioniert, es stoppt dort, wenn ich einen Haltepunkt habe, aber von dort nichts. onCreateViewHolder wird nicht aufgerufen und keiner onBindViewHolder und nicht einmal getItemCount .. Ich versuchte alles, was ich online finden konnte, aber nichts scheint zu funktionieren, also weiß ich nicht, was zu tun ist. Irgendwelche Vorschläge? Hier ist mein Code: Fragment:

public class FragmentPackageDetails extends Fragment { 
    //other vars 
    RecyclerView rvPackageDetails; 
    DatabaseHandler database; 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     Bundle args = getArguments(); 
     String temp = args.getString(KEY_TRACKER_CODE); 
     View v = inflater.inflate(R.layout.fragment_package_details_new, container, false); 

     return v; 
    } 

    @Override 
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 
     super.onViewCreated(view, savedInstanceState); 
     rvPackageDetails = (RecyclerView) view.findViewById(R.id.rvPackageDetails); 
     rvPackageDetails.setLayoutManager(new LinearLayoutManager(getActivity())); 

     database = new DatabaseHandler(getActivity()); 
     selectedPackage = database.getPackage(trackerCode); 

     RecyclerView.Adapter adapter = new MyAdapter(selectedPackage.getRecords()); 
     rvPackageDetails.setAdapter(adapter); 
    } 
    //other methods in class 
} 

MyAdapter

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { 
    private ArrayList<TrackingRecordCheckedOut> mDataset; 

    // Provide a reference to the views for each data item 
    // Complex data items may need more than one view per item, and 
    // you provide access to all the views for a data item in a view holder 
    public class ViewHolder extends RecyclerView.ViewHolder { 
     // each data item is just a string in this case 
     public TextView tvPackageDetailsRowDayOfWeek, tvPackageDetailsRowDayOfMonth, tvPackageDetailsRowNameOfMonth, 
       tvPackageDetailsRowDetailsTitle, tvPackageDetailsRowDetailsDescription, tvPackageDetailsRowDetialsTime; 

     public ViewHolder(View v) { 
      super(v); 
      tvPackageDetailsRowDayOfWeek = (TextView) v.findViewById(R.id.tvPackageDetailsRowDayOfWeek); 
      tvPackageDetailsRowDayOfMonth = (TextView) v.findViewById(R.id.tvPackageDetailsRowDayOfMonth); 
      tvPackageDetailsRowNameOfMonth = (TextView) v.findViewById(R.id.tvPackageDetailsRowNameOfMonth); 
      tvPackageDetailsRowDetailsTitle = (TextView) v.findViewById(R.id.tvPackageDetailsRowDetialsTime); 
      tvPackageDetailsRowDetailsDescription = (TextView) v.findViewById(R.id.tvPackageDetailsRowDetailsDescription); 
      tvPackageDetailsRowDetialsTime = (TextView) v.findViewById(R.id.tvPackageDetailsRowDetialsTime); 
     } 
    } 

    // Provide a suitable constructor (depends on the kind of dataset) 
    public MyAdapter(ArrayList<TrackingRecordCheckedOut> myDataset) { 
     mDataset = myDataset; 
    } 

    // Create new views (invoked by the layout manager) 
    @Override 
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     // create a new view 
     View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_list_item, parent, false); 
     // set the view's size, margins, paddings and layout parameters 
     ViewHolder vh = new ViewHolder(v); 
     return vh; 
    } 

    // Replace the contents of a view (invoked by the layout manager) 
    @Override 
    public void onBindViewHolder(ViewHolder holder, int position) { 
     // - get element from your dataset at this position 
     // - replace the contents of the view with that element 
     TrackingRecordCheckedOut tr = mDataset.get(position); 
     holder.tvPackageDetailsRowDayOfWeek.setText(tr.getDayOfWeek()); 
     holder.tvPackageDetailsRowDayOfMonth.setText(tr.getDayOfWeek()); 
     holder.tvPackageDetailsRowNameOfMonth.setText(tr.getMonthOfYear()); 
     holder.tvPackageDetailsRowDetailsTitle.setText(tr.getTitle()); 
     holder.tvPackageDetailsRowDetailsDescription.setText(tr.getDetails()); 
     holder.tvPackageDetailsRowDetialsTime.setText(tr.getTimeOfDay()); 

    } 

    // Return the size of your dataset (invoked by the layout manager) 
    @Override 
    public int getItemCount() { 
     return mDataset.size(); 
    } 

} 

Fragment Layout:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/rvPackageDetails" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

</LinearLayout> 

RecyclerView Row Layout:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/llPackageDetailsRecyclerViewRow" 
    android:layout_width="match_parent" 
    android:layout_height="96dip" 
    android:orientation="horizontal" 
    android:weightSum="100"> 

    <LinearLayout 
     android:layout_width="0dip" 
     android:layout_height="match_parent" 
     android:layout_weight="20" 
     android:orientation="vertical" 
     android:weightSum="10"> 


     <TextView 
      android:id="@+id/tvPackageDetailsRowDayOfWeek" 
      android:layout_width="match_parent" 
      android:layout_height="0dip" 
      android:layout_weight="3"/> 

     <TextView 
      android:id="@+id/tvPackageDetailsRowDayOfMonth" 
      android:layout_width="match_parent" 
      android:layout_height="0dip" 
      android:layout_weight="4"/> 

     <TextView 
      android:id="@+id/tvPackageDetailsRowNameOfMonth" 
      android:layout_width="match_parent" 
      android:layout_height="0dip" 
      android:layout_weight="3"/> 


    </LinearLayout> 

    <LinearLayout 
     android:layout_width="0dip" 
     android:layout_height="match_parent" 
     android:layout_weight="80" 
     android:orientation="vertical"> 

     <TextView 
      android:id="@+id/tvPackageDetailsRowDetailsTitle" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_weight="3"/> 

     <TextView 
      android:id="@+id/tvPackageDetailsRowDetailsDescription" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_weight="4"/> 

     <TextView 
      android:id="@+id/tvPackageDetailsRowDetialsTime" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_weight="3"/> 

    </LinearLayout> 

</LinearLayout> 

Answer 1

ich Ihren Code sah tun sehe leider leider kein Problem. Eine Sache, die problematisch sein kann, ist, dass Sie in Ihrem ViewHolder-Konstruktor super (v) aufrufen. Möglicherweise müssen Sie super ((LinearLayout) v) aufrufen. Das könnte aber keinen Unterschied machen.

Viel Glück!

Answer 2

Ich hatte das gleiche Problem, in dem weder onCreateViewHolder noch onBindViewHolder aufgerufen wurden. Speichern Sie einen Verweis auf Context im Konstruktor Ihrer Adapter, und dann onCreateViewHolder Methode Ändern der gespeicherten Verweis auf Kontext zu verwenden, anstatt parent.getContext zu tun() sollte es beheben:

private Context mContext; 

public MyAdapter(Context context, ArrayList<TrackingRecordCheckedOut> myDataset) { 
    mDataset = myDataset; 
    mContext = context; 
} 

public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    // create a new view using saved reference to Context (mContext) 
    View v = LayoutInflater.from(mContext).inflate(R.layout.recyclerview_list_item, parent, false); 
    // set the view's size, margins, paddings and layout parameters 
    ViewHolder vh = new ViewHolder(v); 
    return vh; 
}