items in RecyclerView not displaying after filling

after filling the List (correctly filled as my Log shows), the adapter is not displaying the items. I don´t know why.

I read that it´s better to use the special "notify..." methods instead of adapter.notifyDataSetChanged() like adapter.notifyItemInserted(position)...i have done (i hope correctly), but it still shows nothing. i hope you can help me...

(The calling from Obejcts and inserting into the list works properly...and i´m not getting any error after running the app, just the Items are not showing)

**DATA Model (User)**

```
public class User {

public String name;
public String lastMessage;
public ParseObject image;

//Konstruktor
public User(String name, String lastMessage, ParseObject image) {
this.name = name;
this.lastMessage = lastMessage;
this.image = image;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getLastMessage() {
return lastMessage;
}

public void setLastMessage(String lastMessage) {
this.lastMessage = lastMessage;
}

public ParseObject getImage() {
return image;
}

public void setImage(ParseObject image) {
this.image = image;
}
}
```

**Adapter**

```
public class UserListAdapter extends SwipeableUltimateViewAdapter {
public UserListAdapter(List items) {
super(items);
}

//iwas internes
@Override
protected int getNormalLayoutResId() {
return DVHolder.layout;
}

//UltimateRecyclerView interaktionen
@Override
protected UltimateRecyclerviewViewHolder newViewHolder(final View view) {
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(view.getContext(), "Click", Toast.LENGTH_SHORT).show();
}
});

final DVHolder dvHolder = new DVHolder(view, true);
dvHolder.swipeLayout.setOnDoubleClickListener(new SwipeLayout.DoubleClickListener() {
@Override
public void onDoubleClick(SwipeLayout layout, boolean surface) {
Toast.makeText(view.getContext(), "DoubleClick", Toast.LENGTH_SHORT).show();
}
});

dvHolder.deleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
removeAt(dvHolder.getPosition());
Toast.makeText(view.getContext(), "Deleted " + dvHolder.getPosition(), Toast.LENGTH_SHORT).show();
}
});

dvHolder.linearLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(view.getContext(), ""+dvHolder.getAdapterPosition(), Toast.LENGTH_SHORT).show();
}
});

return dvHolder;
}

@Override //Liste mit Daten füllen
protected void withBindHolder(UltimateRecyclerviewViewHolder holder, User user, int position) {
super.withBindHolder(holder, user, position);
((DVHolder) holder).name.setText(user.name);
((DVHolder) holder).lastMessage.setText(user.lastMessage);
//Das ParseFile (Image) wird nachher in der UserListActivity per Code geholt und zum ImageView hinzugefügt

}

//das so lassen
@Override
public DVHolder newFooterHolder(View view) {
return new DVHolder(view, false);
}

//das so lassen
@Override
public DVHolder newHeaderHolder(View view) {
return new DVHolder(view, false);
}

//Views etc. anlegen und zuweisen
public static class DVHolder extends UltimateRecyclerviewViewHolder {
public static final int layout = R.layout.user_item;
public TextView name;
public TextView lastMessage;
public ImageView userImage;

public Button deleteButton;
public LinearLayout linearLayout;
public SwipeLayout swipeLayout;

public DVHolder(View itemView, boolean bind) {
super(itemView);
if (bind) {
name = (TextView) itemView.findViewById(R.id.nameTV);
lastMessage = (TextView) itemView.findViewById(R.id.lastMessageTV);
userImage = (ImageView) itemView.findViewById(R.id.userImageIV);

deleteButton = (Button) itemView.findViewById(R.id.delete);
linearLayout = (LinearLayout) itemView.findViewById(R.id.linearLayout);

//diese standardmäßig so lassen, wenn Du swipe willst...
swipeLayout = (SwipeLayout) itemView.findViewById(R.id.recyclerview_swipe);
swipeLayout.setDragEdge(SwipeLayout.DragEdge.Right);
swipeLayout.setShowMode(SwipeLayout.ShowMode.PullOut);
}
}
}
}
```

**UserListActivity**
```

public class UserListActivity extends AppCompatActivity {

private UserListAdapter adapter;
private List userList;
private ScrollSmoothLineaerLayoutManager mLayoutManager;
protected UltimateRecyclerView ultimateRecyclerView;

ParseObject image;

final private int REQUEST_CODE_ASK_PERMISSION = 123; //kann jegliche Zahl sein. Wir benutzens halt später

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_list);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

// FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
// fab.setOnClickListener(new View.OnClickListener() {
// @Override
// public void onClick(View view) {
// Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
// .setAction("Action", null).show();
// }
// });

image = null;

ultimateRecyclerView = (UltimateRecyclerView) findViewById(R.id.userList_ultimate_recycler_view);

userList = new ArrayList();
adapter = new UserListAdapter(userList);
adapter.setMode(SwipeItemManagerInterface.Mode.Single);
mLayoutManager = new ScrollSmoothLineaerLayoutManager(this, LinearLayoutManager.VERTICAL, false, 500);
ultimateRecyclerView.setLayoutManager(mLayoutManager);
ultimateRecyclerView.setAdapter(adapter);

// NICHT VERGESSEN DAS MANIFEST DIE PERMISSIONS EINZUTRAGEN !!! <----------------------------------

// wenn die Permission NICHT gegeben wurde... und was wir dann machen kommt in diesem Block
if(ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){

if(ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_EXTERNAL_STORAGE)){

//Hier können wir eintragen, wieso wir eigentlich die Permission brauchen/verlangen
}else{

//Permission anfragen
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_CODE_ASK_PERMISSION);
}
}
//---------------------------------------------------------------------------------------------

ParseQuery query = ParseUser.getQuery();

//Für Join <<<<---------
// query.whereMatchesKeyInQuery("Name der ID-Spalte hier", "Name der_FOREIGN_KEY-Spalte in der anderen Tabelle", query (der anderen Tabelle hier einfügen); Wir brauchen also query´s von den Tabellen und dann Matchen wir die Keys in den querys. Das kann man mit belieblig vielen Queries machen (also Joinen miteinander)!!!

if(ParseUser.getCurrentUser() != null){ //Wenn es einen User gibt, der eingeloggt ist.

query.whereNotEqualTo("username", ParseUser.getCurrentUser().getUsername()); //Query mit allen Nutzern OHNE mich selber. "username" ist hier die Spalte mit den Nutzer-Namen.
query.addAscendingOrder("username"); //Aufsteigend sortiert nach usernamen;

query.findInBackground(new FindCallback() {
@Override
public void done(List objects, ParseException e) {

if(e == null){

Log.i("andere User in DB", objects.size()+"");
Log.i("Liste vor befüllen", userList.size()+"");

if(objects.size() > 0){ // Wenn ich Objekte (Usernamen) habe in meiner Tabelle

/* for (int i = 0; i < objects.size(); i++) {
usernames.add(objects.get(i).getUsername());
}*/

// Alternative mit for-each-Schleife (ACHTUNG: Kann sein, dass du noch danach noch arrayadapter.notiyDataSetChanged() aufrufen musst! Teste es einfach mal ohne, ansonsten nach dem befüllen arrayadapter.notiyDataSetChanged(); aufrufen

/*for(ParseUser user: objects){
userList.add(new User(user.getUsername(), "lastMessage", image)); //TODO: Parsefile später als Image holen
}*/

for (int i = 0; i < objects.size(); i++) {
userList.add(new User(objects.get(i).getUsername(), "lastMessage", image)); //TODO: Parsefile später als Image holen
adapter.notifyItemInserted(i);
}

}

Log.i("Liste NACH befüllen", userList.size()+"");

}
}
});
}

//adapter.notifyDataSetChanged();

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_user_list, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if(id == R.id.logout){
ParseUser.logOut();
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
}

return super.onOptionsItemSelected(item);

}
}
```

**XML FILES BELOW**

**content_user_list.xml**

```

```

**activity_user_list.xml**

```

```

**user_item.xml**
```

```

Thanks a lot!

Start in UserListActivity at the ParseQuery callback, then inspect UserListAdapter and the referenced content_user_list.xml and user_item layout. Reproduce the empty list while checking the populated userList, adapter binding, and RecyclerView setup; done means the queried users visibly render in the list without errors.

Written by the indexing model from the issue text.