What you should do is notify what the element you just deleted.tareas.remove(position) notifyItemRemoved(position) notifyDataSetChanged() What you do here is to remove the task element of the position that returns the array, you do not need to pass the object you want to delete, simply the position of the array where this element

onMessageReceived() adds this: if (remoteMessage.data.isEmpty()) { //Aquí creas NotificationBuilder val notificationBuilder = NotificationCompat.Builder(this, NOTIFICATION_CHANEL_ID) .setSmallIcon(R.drawable.logoblanco) .setColor(rgb(255, 255, 255)) .setContentTitle(title) .setContentText(body) .setAutoCancel(true) .setVibrate(longArrayOf(0, 100, 500, 1000)) .setSound(defaultSound) .setContentIntent(pendingIntent) /En mi caso es este/ For notification to arrive when using the application

Looks like duplicate data is added because the viewmodel keeps the state when you rotate the screen, while the fragment is destroyed, try adding a validation to your viewModelpublic RTNotebookViewModel(@NonNull Application application) { super(application); repository_ = new RTNotebookRepository(application); if(allList != null){ return } allList = repository_.getAll(); }

The problem is in this comparison:if (status == "Libre"){ cond=true; } In Java, to compare chains, you have to use equalsNo. ==, therefore the comparison should be like this:if (status.equals("Libre")){ cond=true; } That said, you take too many turns for something so simple. You could make the allocation of color through a tender operator and save yourself several lines of code. For example:public void onBindViewHolder(final ViewHolder holder, int position) { holder.mItem = mValues.get(position); holder.txtViewNumeroMesa.setText(holder.mItem.getNum_mesa_app()); holder.txtViewMesero.setText(holder.mItem.getNombremes_app()); status = holder.mItem.getStatusmesa_app(); /* El ternario reemplazará a los if ... Si el status es "Libre" la variable mColor será verde si no lo es, será roja */ int mColor= status.equals("Libre") ? Color.GREEN : Color.RED; /* Y luego usas mColor para setear el color no hace falta nada más */ holder.crdMesas.setBackgroundColor(mColor); holder.mView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (null != mListener) { mListener.onListFragmentInteraction(holder.mItem); } } }); } PD:The assignment can also be done directly, as follows:int mColor= holder.mItem.getStatusmesa_app().equals("Libre") ? Color.GREEN : Color.RED; Another possibility, in each of which are several colors, would be to declare a property for color in the class that you use as a model to fill the VR.

The LogCat specifies an error:Process: com.example.tallerof, PID: 26337 java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.cyclereview.widget.RecyclerView$LayoutManager)' on a null object referenceThis is because within the most onCreateView() You're not inflating the view where the RecyclerView with id Recycler1, in fact you are looking for it in Activity ( getActivity() ...where's probably not found. recyclerView = getActivity().findViewById(R.id.Recycler1); What you must do is inflate the Fragment layout that contains the RecyclerView and you must also return a view and not a null value, for example, assuming that the layout of your Fragment containing the RecyclerView is my_fragment.xml : @Override public View onCreateViewHolder(ViewGroup parent, int viewType) { View myView = inflater.inflate(R.layout.my_fragment, container, false); //recyclerView = getActivity().findViewById(R.id.Recycler1); recyclerView = myView.findViewById(R.id.Recycler1); ... ... return myView; } Check this out. https://github.com/Jorgesys/Android-RecyclerView-and-Fragment/blob/master/app/src/main/java/com/jorgesys/recyclerviewinfragment/ListFragment.java .With regard to this error:java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at com.example.tallerof.adapters.UsersAdapter$UsersHolder.AssignDatos(UsersAdapter.java:53)It is because the TextView does not exist within item_regis.xml I don't think it was supposed to be. R.id.Recycler1surely this is not a TextView, check what is the right id of the Id and correct it.public UsuariosHolder(@NonNull View itemView) { super(itemView); // dato=(TextView) itemView.findViewById(R.id.Recycler1); dato=(TextView) itemView.findViewById(R.id.?????); }

In this example you can see how using onScrolled() you can detect scroll to the right and left, @Override public void onScrolled(final RecyclerView recyclerView, final int dx, final int dy) { //Toast.makeText(getActivity(),"SCROLLING",Toast.LENGTH_SHORT).show(); if (dx > 0) { System.out.println("Scroll hacia la derecha."); } else if (dx < 0) { System.out.println("Scroll hacia la izquierda."); } else { System.out.println("No realiza scroll horizontal."); } } With the combination of the methods onScrollStateChanged() and onScrolled() you can detect all types of motion. I suggest you not to use a Toast, print the messages in LogCat to review the operation of these methodsprivate final RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() { @Override public void onScrollStateChanged(final RecyclerView recyclerView, final int newState) { switch (newState) { case RecyclerView.SCROLL_STATE_DRAGGING: System.out.println("Realiza scroll."); break; case RecyclerView.SCROLL_STATE_SETTLING: System.out.println("Asentando Scroll."); break; case RecyclerView.SCROLL_STATE_IDLE: System.out.println("No realiza scroll."); break; } } @Override public void onScrolled(final RecyclerView recyclerView, final int dx, final int dy) { //Toast.makeText(getActivity(),"SCROLLING BITCH",Toast.LENGTH_SHORT).show(); //Movimiento horizontal. if (dx > 0) { System.out.println("Scroll hacia la derecha."); } else if (dx < 0) { System.out.println("Scroll hacia la izquierda."); } else { System.out.println("No realiza scroll horizontal."); } //Movimiento vertical. if (dy > 0) { System.out.println("Scroll hacia abajo."); } else if (dy < 0) { System.out.println("Scroll hacia arriba."); } else { System.out.println("No realiza scroll vertical."); } } };

To bring users with the filter you want to use to fill that RecyclerView, you should use the composite queries offered by Firebase, you can order by name and by club, for example, this Query would bring you from that collection all the users whose name is the one you pass and club is the one you pass.Query query = jugadoresRef.whereEqualTo("APELLIDO",apellido).whereEqualTo("CLUB",club) Just changing this, now the documents you're bringing from that collection are going to be filtered by surname and club according to the parameters you send in that clause.I noticed that when you use this you will need to create a composite query in Firestore, so when you run this code for the first time, your recyclerview will not show anything, for that go to the logcat, and notice that Firebase tells you that you need to create the composite query by following a link, click that link and already generate this query on the console, after it is generated, just enter the appYou can read more about this in the documentation https://firebase.google.com/docs/firestore/query-data/queries?hl=es Or follow one of my videos I explain how to create these queries https://www.youtube.com/watch?v=oKTfnF6hVV0

It is not entirely correct to try to obtain the position within onCreateViewHolder() , the problem is that if an element is removed the position is no longer obtained since the value will be -1, because of this you have to perform the following validation:viewHolder.view_contenedor.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int posicion = viewHolder.getAdapterPosition(); if (posicion != RecyclerView.NO_POSITION) { Intent intent = new Intent(viewGroup.getContext(), Campeonatos.class); intent.putExtra("nombre1", mData.getItem(posicion).getNombre1()); intent.putExtra("titulo", mData.getItem(posicion).getTitulo()); intent.putExtra("imagen1", mData.getItem(posicion).getImagen1()); context.startActivity(intent); } } }); Check the document: https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder

I've seen the whole code and nowhere I see you do the conditional to get the children of certain parents, the query has no condition and it brings all the data from the table. The getId variable is not used at all at any time by bringing the data from the children, or by making the data request to the server. It is logical that if you add a where in delete you return empty data since you do not send the father's Id to the server and the condition is not fulfilled.In case you want to add the id you would do it at the StringRequest where you use the URL for the server call, there you have a URL_Sons variable, there you would need to concatenate a query string to add the variable. There would be something like that:URL_Hijos+"?idPadre="+id_padre You would also have to modify your PHP file to take the variable in the request, it would be something like that (I am not an expert in PHP):$parts = parse_url($url); parse_str($parts['query'], $query); $id_padre = $query['idPadre']

You're missing starting lists.@Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment_chats, container, false); initData(); ... } private initData(){ parejaList = new ArrayList<>(); parejaList.add(new Pareja(R.drawable.icon_logo_chico_avenlife_azul)); parejaList.add(new Pareja(R.drawable.icon_logo_chico_avenlife_azul)); ... chatList = new ArrayList<>(); chatList.add(new Chat(R.drawable.icon_logo_chico_avenlife_azul,"Pablo","Holaa",1)); chatList.add(new Chat(R.drawable.icon_logo_chico_avenlife_azul,"Pablo","Holaa",4)); ... }

Try to do something like this:@Override public void onClick(View v) { MainActivity Main = new MainActivity(); Intent intent = new Intent(context,MainActivity.class); Bundle extras = new Bundle(); extras.putString("valor1",objeto.getText().toString()); intent.putExtras(extras); extras.putString("valor2", objeto.getText().toString()); extras.putBoolean("valorn", true); intent.putExtras(extras); context.startActivity(intent); } Here you get your parameters: Intent intent = getIntent(); Bundle bundle = intent.getExtras(); boolean istrue= getIntent().getBooleanExtra("valorn", false); if (istrue) { String var1 = getIntent().getStringExtra("valor1");///getIntent().getStringExtra( String var2= getIntent().getStringExtra("valor2"); hacerAlgo(var1,var2); } Make use of log to visualize the result on Android MonitorLog.i("MITAG","valor a mostrar en el log");

You can call this method after updating the datarecetasAdapter.notifyDataSetChanged();

The problem is the following, when you go to the reference to erase, you go straight to the whole node tabernasFavoritas and not directly to the id inside tavernsFavourites you want to delete.In this lineQuery mQuery = databaseListaTabernasFavoritas.child("tabernasfavoritas") You must include a child more than would be the object you want to delete inside tabernasFavoritas.You can just do it.databaseListaTabernasFavoritas.child("tabernasfavoritas").child(KEY).removeValue() To prove that this works, put in KEY the value of the KEY that you want to erase in firebase as hardcoded, once you do the swipe you will see that that key is deleted inside your node tabernasFavoritasNow, what you should do to know which one you should delete from Firebase by deleting that object from the list is the following.When you get the item from the list to delete int position = viewHolder.getAdapterPosition(); favoriteTavernList.remove(position); What you can do is at the time that you bring the value of this object is to store in that object also the ID that corresponds to the moment of being created, then then you only access the id of the object you are by deleting to delete it also from Firebaseint position = viewHolder.getAdapterPosition(); favoriteTavernList.remove(position); String key = favoriteTavernList.get(position).tabernaID; And thendatabaseListaTabernasFavoritas.child("tabernasfavoritas").child(tabernaId).removeValue() Then when you make swipe of that element, the same object already stores the id in Firebase where to reference, and you only go to that ID within tavernsfavorites and erase that element.

The problem is that you initially have a layout Fragmentif you want to perform a "replacement" of a Fragment, It can only replace a dynamically added Fragment." Fragments defined in a layout cannot be replaced.So instead of a Fragment: <fragment android:id="@+id/nav_host_fragment" ... ... /> Use a FrameLayout in which you do not define a Fragment, but if you can perform Fragments replacements within this element: <FrameLayout android:id="@+id/nav_host_fragment" ... ... />

I found the solution. Instead of using recyclerView.smoothScrollToPosition(list_data.size()-1);Now I use: recyclerView.scrollToPosition(list_data.size()-1);In this way the animations of the new item are maintained. Apparently it was not possible to show the animation of displacement and the Animator of the new items at the same time. Thank you all

The class that acts as a row must inherit kivy.uix.recycleview.views.RecycleDataViewBehavior, done this you can use the method refresh_view_attrs to assign the values.On the other hand the height of RecycleBoxLayout must be the minimum to contain items or it will be impossible to scrooll, you need to add the following values to these properties:size_hint_y: None height: self.minimum_height A basic example would be:import json from kivy.app import App from kivy.lang import Builder from kivy.uix.button import Button from kivy.uix.gridlayout import GridLayout from kivy.uix.recycleview.views import RecycleDataViewBehavior esta funcion nos devolvera el valor del json def sacar_nombres(): with open('data/centros.json') as f: places = json.load(f) return places items = sacar_nombres() KV = ''' <CenterViewRow>: cols: 2 labelid_text: '' entryname_text: '' TextInput: id: id_entryname text: root.entryname_text Label: id: id_labelid text: root.labelid_text RecycleView: data: [] viewclass: 'CenterViewRow' RecycleBoxLayout: default_size_hint: 1, None default_heigth: 100 orientation: 'vertical' size_hint_y: None height: self.minimum_height ''' class CenterViewRow(RecycleDataViewBehavior, GridLayout): def refresh_view_attrs(self, rv, index, data): self.entryname_text = data['entryname'] self.labelid_text = data['labelid'] return super().refresh_view_attrs( rv, index, data) class Test(App): def build(self): root = Builder.load_string(KV) root.data= [ {'entryname': item["id"], 'labelid': item["centro"]} for item in items] print(root.data) return root Test().run() Like test JSON:[{"id": "1", "nombre": "Centro A"}, {"id": "2", "nombre": "Centro B"}, {"id": "3", "nombre": "Centro C"}]

The Adapter has a property that can help you a lot getItemViewType(), This property returns an integer value that you can take as a type, for example imagine that we return by this function the number [1] then the Adapter understands that the layout will be of type [1], imagine that we return the value [2] then the Adapter understands that we are working with the type [2]. For a better detail I invite you to visit the following link where they have a complete example of how to use this property. https://parzibyte.me/blog/2019/07/03/recyclerview-multiples-vistas-viewholders-android/ In this example you have:private final int TIPO_NORMAL = 1; private final int TIPO_VER_MAS = 0; @Override public int getItemViewType(int position) { if (position == listaDeGastos.size() - 1) return TIPO_VER_MAS; return TIPO_NORMAL; } What's going on is the following: listadoDeGastos returns the whole TIPO_VER_MAS in any other case is returned TIPO_NORMAL, in your case this function should return the logic to know when to return a type of 120dp and another type of 100dp. @NonNull @Override public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) { switch (viewType) { case TIPO_VER_MAS: View filaVerMas = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fila_ver_mas, viewGroup, false); return new ViewHolderVerMas(filaVerMas); case TIPO_NORMAL: default: View filaGasto = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fila_gasto, viewGroup, false); return new ViewHolderGasto(filaGasto); } } Now in your RecyclerView.ViewHolder we can use this property to inflate several layout types (in your case for example you could use the type TIPO_NORMAL to call a layout that has 120dp height dean and you could use the type TIPO_VER_MAS to inflate a 100dp layout.

Try to pass the activity he's in.For this you must request when you start your adapter Activity. This can be assigned from the following manenra: YourNameActivity.this.Then assign this to a Activity activity variable.And make the following change:FragmentTransaction transaction = activity.getFragmentManager().beginTransaction();

Note that the adapter's onBindViewHolder() method already has the position. This is where you should make the setOnClickListener():holder.itemView.setOnClickListener { itemClickHandler.invoke(position) }

Note that the first item has a larger size than the rest of items and, when you move around the list and return, it is recycling and the size is now equal, but of course, the text is out of sight... with ConstraintLayout is easy to fix it, with Relative I would have to investigate... try to make the last TextView a fixed size, this way when your view is recicle, all will have a fixed size.With Constraint be like this: <androidx.appcompat.widget.AppCompatTextView android:id="@+id/animals_location_text_iv" android:layout_width="0dp" android:layout_height="0dp" android:layout_marginStart="16dp" android:maxLines="3" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="@id/animals_guideline_end" app:layout_constraintStart_toEndOf="@id/animals_location_icon_iv" app:layout_constraintTop_toTopOf="@id/animals_location_icon_iv" app:layout_constraintVertical_bias="0" tools:text="Villa Ballester, \nBuenos Aires, \nArgentina" />