Firebase Adapter populateViewHolder() wird nie

Question

Aktivität Layout genannt:

android: layout_height = "match_parent"

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     android:id="@+id/activity_list_tasks2" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

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

    ... something else... 

    </RelativeLayout> 

Aktivitätsklasse:

rv.setHasFixedSize (true);

public class AdminActivity2 extends AppCompatActivity { 

    RecyclerView rv; 

    private DatabaseReference myRef; 

    FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser(); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.admin_activity); 

     rv = (RecyclerView) findViewById(R.id.rv_list_tasks); 

     myRef = FirebaseDatabase.getInstance().getReference(); 

     FirebaseRecyclerAdapter<Machinist, AdminActivity2.MachinistsViewHolder2> adapter; 
     LinearLayoutManager llm = new LinearLayoutManager(this); 
     llm.setOrientation(LinearLayoutManager.VERTICAL); 
     rv.setLayoutManager(llm); 
     rv.setHasFixedSize(true); 
     rv.post(this::supportStartPostponedEnterTransition); 
     Query query = myRef.child("Машинисты").orderByChild("points/itogo"); 

     adapter = new FirebaseRecyclerAdapter<Machinist, MachinistsViewHolder2>(
       Machinist.class, 
       R.layout.machinist_item, 
       MachinistsViewHolder2.class, 
       query){ 

      @Override 
      public void onBindViewHolder(MachinistsViewHolder2 viewHolder, int position) { 

      } 

      @Override 
      protected void populateViewHolder(MachinistsViewHolder2 viewHolder, Machinist model, int position) { 

       Log.d("djuyf", "populate"); 

       Typeface mTypeface; 
       mTypeface = Typeface.create("sans-serif-regular", Typeface.NORMAL); 

       DatabaseReference itemRef = getRef(position); 

       viewHolder.cvRemove.setOnClickListener(view -> { 
        AlertDialog diaBox = askOption(itemRef); 
        diaBox.show(); 
       }); 
       viewHolder.cvArchive.setOnClickListener(view -> { 
        Intent startArchiveActivity = new Intent(AdminActivity2.this, Archive.class); 
        startArchiveActivity.putExtra("Name", viewHolder.tvName.getText().toString()); 
        Gson gson = new Gson(); 
        String myJson = gson.toJson(model); 
        startArchiveActivity.putExtra("myjson", myJson); 
        startActivity(startArchiveActivity); 
       }); 

       viewHolder.tvPosition.setText(String.format(Locale.getDefault(), "%02d", position + 1)); 
       viewHolder.tvName.setText(model.getLastName() + " " + model.getFirstName().charAt(0) + model.getMiddleName().charAt(0)); 
       viewHolder.tvName.setTypeface(mTypeface); 

       viewHolder.cvTo.setTitleText(pointCount(model.getArchive(), Constants.header.to, false)); 
       viewHolder.cvTo.setOnClickListener(view -> showDialog("Цикл ТО-1", itemRef, model, TO, viewHolder.cvItogo)); 

       viewHolder.cvKs.setTitleText(pointCount(model.getArchive(), Constants.header.ks, false)); 
       viewHolder.cvKs.setOnClickListener(view -> showDialog("Культурное состояние локомотива", itemRef, model, KS, viewHolder.cvItogo)); 

       viewHolder.cvTz.setTitleText(pointCount(model.getArchive(), Constants.header.tz, false)); 
       viewHolder.cvTz.setOnClickListener(view -> showDialog("Посещение технических занятий", itemRef, model, TZ, viewHolder.cvItogo)); 

       viewHolder.cvRl.setTitleText(pointCount(model.getArchive(), Constants.header.rl, false)); 
       viewHolder.cvRl.setOnClickListener(view -> showDialog("Расшифровка лент", itemRef, model, RL, viewHolder.cvItogo)); 

       viewHolder.cvOt.setTitleText(pointCount(model.getArchive(), Constants.header.ot, false)); 
       viewHolder.cvOt.setOnClickListener(view -> showDialog("Охрана труда", itemRef, model, OT, viewHolder.cvItogo)); 

       viewHolder.cvOtk.setTitleText(pointCount(model.getArchive(), Constants.header.oz, false)); 
       viewHolder.cvOtk.setOnClickListener(view -> showDialog("Отказы", itemRef, model, OTK, viewHolder.cvItogo)); 

       viewHolder.cvItogo.setTitleText(pointCount(model.getArchive(), null, true)); 
       viewHolder.cvItogo.setOnClickListener(view -> setSelected(true, true, viewHolder)); 

      } 
     }; 

     rv.setAdapter(adapter); 

    } 

    public static class MachinistsViewHolder2 extends RecyclerView.ViewHolder { 

     SwipeLayout sl; 

     RelativeLayout rlDataContainer; 

     TextView tvPosition; 
     TextView tvName; 
     CircleView cvTo; 
     CircleView cvKs; 
     CircleView cvTz; 
     CircleView cvRl; 
     CircleView cvOt; 
     CircleView cvOtk; 
     CircleView cvItogo; 

     CircleImageView cvRemove; 
     CircleImageView cvArchive; 

     public MachinistsViewHolder2(View itemView) { 
      super(itemView); 

      rlDataContainer = (RelativeLayout)itemView.findViewById(R.id.rlDataContainer); 

      sl = (SwipeLayout) itemView.findViewById(R.id.sl); 
      sl.setShowMode(SwipeLayout.ShowMode.LayDown); 
      sl.addDrag(SwipeLayout.DragEdge.Left, itemView.findViewById(R.id.bottom_wrapper)); 

      tvPosition = (TextView) itemView.findViewById(R.id.tvPosition); 
      tvName = (TextView) itemView.findViewById(R.id.tvName); 

      cvTo = (CircleView) itemView.findViewById(R.id.cvTo); 
      cvKs = (CircleView) itemView.findViewById(R.id.cvKs); 
      cvTz = (CircleView) itemView.findViewById(R.id.cvTz); 
      cvRl = (CircleView) itemView.findViewById(R.id.cvRl); 
      cvOt = (CircleView) itemView.findViewById(R.id.cvOt); 
      cvOtk = (CircleView) itemView.findViewById(R.id.cvOtk); 
      cvItogo = (CircleView) itemView.findViewById(R.id.cvItogo); 

      cvRemove = (CircleImageView) itemView.findViewById(R.id.cvRemove); 
      cvArchive = (CircleImageView) itemView.findViewById(R.id.cvArchive); 
     } 
    } 
} 

Als Ergebnis sehe ich die Liste. Aber ich kann die Methode setText() nicht für TextView aufrufen. Weil populateViewHolder nie aufgerufen wird. Wo habe ich einen Fehler gemacht?

Answer 1

Ich denke, man populateViewHolder von onBindViewHolder wie diese

@Override 
public void onBindViewHolder(MachinistsViewHolder2 viewHolder, int position) { 
     Machinist model = getItem(position); 

     populateViewHolder(viewHolder, model, position); 

} 

ref here anrufen müssen.

Answer 2

ich darüber vergessen:

super.onBindViewHolder (viewHolder, Position);

innen Methode onBindViewHolder (MachinistsViewHolder viewHolder, int-Position);