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O recyclerView só aparece um item para mim

Estou testando o recyclerview, para mim sempre aparece somente o primeiro item, mas o restante da lista nao é criada. Ja fiz varios teste e tanto o onBindViewHoldel, oncreateViewHolder so são execultado uma vez.

Diferente do curso o recyclerview para mim ja aparece e nao consegui fazer add as dependencia conforme mostrado no curso, nem usar a mesma tag conforme o curso.

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.LoginActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/activity_login_lista"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="1dp"
        android:layout_marginEnd="1dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Observe que para mim aparece "androidx.constraintlayout.widget.ConstraintLayout"

public class LoginAdapter extends RecyclerView.Adapter {

    ArrayList<String> arraylist;
    Context context;
    public LoginAdapter(Context context, ArrayList<String> arraylist) {
      this.arraylist = arraylist;
      this.context = context;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View criaView = LayoutInflater.from(context).
                inflate(R.layout.item_login, parent, false);
        return new LoginViewHolder(criaView);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

    }

    @Override
    public int getItemCount() {
        return arraylist.size();
    }

    class LoginViewHolder extends RecyclerView.ViewHolder{


        public LoginViewHolder(@NonNull View itemView) {

            super(itemView);
        }
    }
}

O Adapter esta imconpleto mesmo, pois deixei o mais simples possivel, so para ver as view sendo criada, mas so mostra o primeiro

'com.android.application' version '7.1.3'

4 respostas

Fabio, tudo bem ?

Cara consegue mostrar o layout do item_login e também o local onde está utilizando o adapter?

Meu item_login

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/item_usuario_nome"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Loja 1"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

</androidx.constraintlayout.widget.ConstraintLayout>

Minha classe principal

package br.com.alrasistemas.alrasistemas.ui;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import java.util.ArrayList;
import br.com.alrasistemas.alrasistemas.R;
import br.com.alrasistemas.alrasistemas.adapter.LoginAdapter;

public class LoginActivity extends AppCompatActivity {


    private LoginAdapter loginAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        ArrayList<String> arraylist = new ArrayList<>();
        arraylist.add("teste1");
        arraylist.add("teste2");
        arraylist.add("teste3");
        arraylist.add("teste4");
        arraylist.add("teste5");

        RecyclerView recyclerView = findViewById(R.id.activity_login_lista);
        loginAdapter = new LoginAdapter(this, arraylist);
        recyclerView.setAdapter(loginAdapter);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);


    }
}

O adapter

package br.com.alrasistemas.alrasistemas.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;

import br.com.alrasistemas.alrasistemas.R;


public class LoginAdapter extends RecyclerView.Adapter {

    ArrayList<String> arraylist;
    Context context;
    public LoginAdapter(Context context, ArrayList<String> arraylist) {
      this.arraylist = arraylist;
      this.context = context;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View criaView = LayoutInflater.from(context).
                inflate(R.layout.item_login, parent, false);
        return new LoginViewHolder(criaView);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

    }

    @Override
    public int getItemCount() {
        return arraylist.size();
    }

    class LoginViewHolder extends RecyclerView.ViewHolder{


        public LoginViewHolder(@NonNull View itemView) {

            super(itemView);
        }
    }
}

(Emulador )

no Logcat aparece


2022-05-12 21:24:05.333 22274-22289/br.com.alrasistemas.alrasistemas D/: HostConnection::get() New Host Connection established 0x9bdc3200, tid 22289
2022-05-12 21:24:05.338 22274-22289/br.com.alrasistemas.alrasistemas I/OpenGLRenderer: Initialized EGL, version 1.4
2022-05-12 21:24:05.338 22274-22289/br.com.alrasistemas.alrasistemas D/OpenGLRenderer: Swap behavior 1
2022-05-12 21:24:05.339 22274-22289/br.com.alrasistemas.alrasistemas W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
2022-05-12 21:24:05.339 22274-22289/br.com.alrasistemas.alrasistemas D/OpenGLRenderer: Swap behavior 0
2022-05-12 21:24:05.358 22274-22289/br.com.alrasistemas.alrasistemas D/EGL_emulation: eglCreateContext: 0xab505180: maj 2 min 0 rcv 2
2022-05-12 21:24:05.384 22274-22289/br.com.alrasistemas.alrasistemas D/EGL_emulation: eglMakeCurrent: 0xab505180: ver 2 0 (tinfo 0xab5031f0)
2022-05-12 21:24:05.418 22274-22289/br.com.alrasistemas.alrasistemas D/EGL_emulation: eglMakeCurrent: 0xab505180: ver 2 0 (tinfo 0xab5031f0)

mas nenhum erro

solução!

Da uma olhada que no começo do item você falou que ele pega a tela inteira (match_parent) basta mudar para wrap_content e deve funcionar

Era isso mesmo, muito obrigado.

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