Aplicación de ejemplo RecyclerView, CardView y menus

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".activities.MainActivity">

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

</RelativeLayout>

build.gradle

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'

    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.android.support:design:23.4.0'
    compile 'com.android.support:cardview-v7:23.4.0'
    compile 'com.android.support:recyclerview-v7:23.4.0'
}

item_persona.xml

<?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="wrap_content"
    android:orientation="vertical">

    <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardCornerRadius="4dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:id="@+id/nombreTextView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/app_name"
                android:textSize="24sp" />

            <TextView
                android:id="@+id/signoTextView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/app_name" />

        </LinearLayout>


    </android.support.v7.widget.CardView>


</LinearLayout>

MainActivity.java

package tech.alvarez.ejemplorecyclerview.activities;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import tech.alvarez.ejemplorecyclerview.R;
import tech.alvarez.ejemplorecyclerview.adapters.OnItemClickListener;
import tech.alvarez.ejemplorecyclerview.adapters.PersonasAdapter;
import tech.alvarez.ejemplorecyclerview.models.Persona;

public class MainActivity extends AppCompatActivity implements OnItemClickListener {

    private RecyclerView personasRecyclerView;
    private PersonasAdapter personasAdapter;

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


        personasRecyclerView = (RecyclerView) findViewById(R.id.personasRecyclerView);
        personasRecyclerView.setHasFixedSize(true);
        personasRecyclerView.setLayoutManager(new LinearLayoutManager(this));

        personasAdapter = new PersonasAdapter(this);
        personasRecyclerView.setAdapter(personasAdapter);


        Persona persona1 = new Persona("Maria", "Libra");
        Persona persona2 = new Persona("Juan", "Acuario");
        Persona persona3 = new Persona("Pedro", "Cancer");

        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);
        personasAdapter.add(persona1);
        personasAdapter.add(persona2);
        personasAdapter.add(persona3);

    }

    @Override
    public void onItemClick(Persona persona) {
        Toast.makeText(getApplicationContext(), persona.getNombre() + " " + persona.getSigno(), Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return super.onOptionsItemSelected(item);
    }
}

menu_main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/contactoMenuItem"
        android:icon="@mipmap/ic_launcher"
        android:title="@string/contacto"
        app:showAsAction="always" />

    <item
        android:id="@+id/acercaDeMenuItem"
        android:icon="@mipmap/ic_launcher"
        android:title="@string/acercaDe"
        app:showAsAction="never" />
</menu>

OnItemClickListener.java

package tech.alvarez.ejemplorecyclerview.adapters;

import tech.alvarez.ejemplorecyclerview.models.Persona;

public interface OnItemClickListener {

    void onItemClick(Persona persona);

}

Persona.java

package tech.alvarez.ejemplorecyclerview.models;


public class Persona {
    private String nombre;
    private String signo;

    public Persona(String nombre, String signo) {
        this.nombre = nombre;
        this.signo = signo;
    }

    public String getNombre() {
        return nombre;
    }

    public void setNombre(String nombre) {
        this.nombre = nombre;
    }

    public String getSigno() {
        return signo;
    }

    public void setSigno(String signo) {
        this.signo = signo;
    }
}

PersonasAdapter.java

package tech.alvarez.ejemplorecyclerview.adapters;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;

import tech.alvarez.ejemplorecyclerview.R;
import tech.alvarez.ejemplorecyclerview.models.Persona;

public class PersonasAdapter extends RecyclerView.Adapter<PersonasAdapter.ViewHolder> {

    private ArrayList<Persona> dataset;
    private OnItemClickListener onItemClickListener;

    public PersonasAdapter(OnItemClickListener onItemClickListener) {
        dataset = new ArrayList<>();
        this.onItemClickListener = onItemClickListener;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_persona, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Persona persona = dataset.get(position);
        holder.nombreTextView.setText(persona.getNombre());
        holder.signoTextView.setText(persona.getSigno());

        holder.setOnItemClickListener(persona, onItemClickListener);
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {

        TextView nombreTextView;
        TextView signoTextView;

        public ViewHolder(View itemView) {
            super(itemView);
            nombreTextView = (TextView) itemView.findViewById(R.id.nombreTextView);
            signoTextView = (TextView) itemView.findViewById(R.id.signoTextView);
        }

        public void setOnItemClickListener(final Persona persona, final OnItemClickListener onItemClickListener) {
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onItemClickListener.onItemClick(persona);
                }
            });
        }
    }



    public void add(Persona persona) {
        dataset.add(persona);
        notifyDataSetChanged();
    }

    public void clear() {
        dataset.clear();
        notifyDataSetChanged();
    }
}