Exemplo de uso do Adapter com RecyclerView

AbstractAdapter.java

import android.content.Context;
import android.content.res.TypedArray;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;

import java.util.ArrayList;
import java.util.List;

/**
 * Adapter genérico.
 * 
 * Created by douglas on 25/08/15.
 */
public abstract class AbstractAdapter<VH extends AbstractAdapter.AbstractViewHolder, I> extends RecyclerView.Adapter<VH> {

    protected final Context mContext;
    protected List<I> mItems;
    protected final LayoutInflater mLayoutInflater;

    public AbstractAdapter(Context context) {
        this(context, new ArrayList<I>());
    }

    public AbstractAdapter(Context context, List<I> items) {
        mContext = context;
        mItems = items;
        mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public void onBindViewHolder(final VH holder, final int position) {
        if (position >= 0 && position < mItems.size()) {
            final I item = mItems.get(position);
            onBindViewHolder(holder, position, item);
        }
    }

    protected abstract void onBindViewHolder(VH holder, int position, I item);

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

    public void setItems(List<I> items) {
        mItems = items;
    }

    public List<I> getItems() {
        return mItems;
    }

    protected void onItemClickListener(int adapterPosition, int layoutPosition) {

    }

    protected boolean onLongItemClickListener(int adapterPosition, int layoutPosition) {
        return false;
    }

    public class AbstractViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {

        public AbstractViewHolder(View itemView) {
            super(itemView);
            itemView.setClickable(true);
            itemView.setOnClickListener(this);
            itemView.setOnLongClickListener(this);
            if (itemView instanceof FrameLayout) {
                int[] textSizeAttr = new int[]{android.R.attr.selectableItemBackground};
                int indexOfAttr = 0;
                TypedArray a = mContext.obtainStyledAttributes(textSizeAttr);
                ((FrameLayout) itemView).setForeground(a.getDrawable(indexOfAttr));
                a.recycle();
            }
        }

        @Override
        public void onClick(View v) {
            onItemClickListener(getAdapterPosition(), getLayoutPosition());
        }

        @Override
        public boolean onLongClick(View v) {
            return onLongItemClickListener(getAdapterPosition(), getLayoutPosition());
        }
    }
}

card_empregado_item.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Exemplo de XML de layout com Card para utilizar como Item do Adapter -->
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="4dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="4dp"
    app:cardCornerRadius="4dp"
    app:cardElevation="3dp"
    app:cardPreventCornerOverlap="true"
    app:cardUseCompatPadding="false" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="false"
        android:orientation="horizontal"
        android:padding="24dp">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:id="@+id/tv_nome"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:text="Carlos Alberto"
                android:textColor="#000"
                android:textSize="@dimen/recyclerview_primary_text" />

            <TextView
                android:id="@+id/tv_funcao"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:text="Tratorista"
                android:textColor="#80000000"
                android:textSize="@dimen/recyclerview_secondary_text" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:paddingStart="24dp">

            <TextView
                android:id="@+id/tv_cod"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:text="1"
                android:textColor="@color/colorAccent"
                android:textSize="@dimen/recyclerview_secondary_text" />

        </LinearLayout>
    </LinearLayout>

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

EmpregadoActivity.java

import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;

import com.projeto.pacote.R;
import com.projeto.pacote.model.Empregado;

import java.util.List;

/**
 * Exemplo de Activity com instanciação do Adapter
 * 
 * Created by douglas on 26/08/15.
 */
public class EmpregadoActivity extends AppCompatActivity {

    private RecyclerView rvEmpregados;
    private EmpregadosAdapter empregadosAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.empregado_activity);
        
        rvEmpregados = (RecyclerView) findViewById(R.id.rv_empregados);
        final StaggeredGridLayoutManager llm = new StaggeredGridLayoutManager(1, StaggeredGridLayoutManager.VERTICAL);
        llm.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE);
        rvEmpregados.setLayoutManager(llm);
        
        empregadosAdapter = new EmpregadosAdapter(this, getEmpregados()) {
            @Override
            protected void onItemClickListener(int adapterPosition, int layoutPosition) {
                // evento de click simples
            }
            @Override
            protected boolean onLongItemClickListener(int adapterPosition, int layoutPosition) {
                // evento e click longo
                return true;
            }
        };
        
        rvEmpregados.setAdapter(empregadosAdapter);
    }
    
    public List<Empregado> getEmpregados() {
        // select * from empregados   
    }
}

EmpregadosAdapter.java

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.projeto.pacote.R;
import com.projeto.pacote.model.Empregado;

import java.util.List;

/**
 * Exemplo de implementação do Adapter para a classe Empregado.
 * 
 * Created by douglas on 18/08/15.
 */
public class EmpregadosAdapter extends AbstractAdapter<EmpregadosAdapter.ViewHolder, Empregado> {

    public EmpregadosAdapter(Context context) {
        super(context);
    }

    public EmpregadosAdapter(Context context, List<Empregado> items) {
        super(context, items);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = mLayoutInflater.inflate(R.layout.card_empregado_item, parent, false);
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position, Empregado item) {
        holder.tvNome.setText(item.getNome());
        holder.tvFuncao.setText(item.getFuncao());
        holder.tvCod.setText(item.getCod() + "");
    }

    public class ViewHolder extends AbstractAdapter.AbstractViewHolder {
        final TextView tvNome;
        final TextView tvFuncao;
        final TextView tvCod;

        public ViewHolder(View view) {
            super(view);
            tvCod = (TextView) view.findViewById(R.id.tv_cod);
            tvNome = (TextView) view.findViewById(R.id.tv_nome);
            tvFuncao = (TextView) view.findViewById(R.id.tv_funcao);
        }
    }
}