Recyclerview with models/pojos

public class Adapter extends RecyclerView.Adapter<MyViewHolder> {

    private List<ContactInfoModel> mAllContactNamesList;

    /**

     * Here data will be passed to mNames by Activity.

     * @param mNames will be filled/assigned by activity, and mNames will be stored in global variable

     *               to be used for getItemCount(),setting values for each row in onBindViewHolder.

     */

    Adapter(List<ContactInfoModel> mNames) {

        this.mAllContactNamesList = mNames;

    }

    @NonNull

    @Override

    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        // One Model row used to generate multiple rows based on list size. Then inside views will be initialized by MyViewHolder.

        //ఒక లేఔట్ లాగా చాలా రోస్ క్రియేట్ అవుతాయి row_layout లేయవుట్ తో . లేఔట్ లో ఉన్న వ్యూస్ మీవ్యూహోల్డర్ లో ఇనిషిలైజ్ అవుతాయి.

        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_layout,

                parent,false);

        return new MyViewHolder(view);

    }

    @Override

    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {

        //set names for each row based on position.

        /* ఇక్కడ పోసిషన్ తో క్రియేట్ అయినా రోస్ కి వాల్యూ ఇవ్వబడుతుంది */

        holder.mTVContactName.setText(mAllContactNamesList.get(position).getName());

    }

    @Override

    public int getItemCount() {

        // Based on list size , recyclerview creates rows.

        return mAllContactNamesList.size();

    }

}

public class ContactInfoModel {

    String name;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

public class MyViewHolder extends RecyclerView.ViewHolder {

    protected TextView mTVContactName;

    public MyViewHolder(View itemView) {

        super(itemView);

        mTVContactName = itemView.findViewById(R.id.tv_contact_name);

    }

}

<?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="match_parent"

    android:orientation="vertical">

    <!-- RecyclerView-->

    <android.support.v7.widget.RecyclerView

        android:id="@+id/contacts_rv"

        android:layout_width="match_parent"

        android:layout_height="match_parent"/>

</LinearLayout>

<?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">

    <!-- Above, height should be wrap_content,

    otherwise one row will be shown like very big as whole screen.-->

    <TextView

        android:id="@+id/tv_contact_name"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:padding="10dp"

        android:textSize="22sp"/>

</LinearLayout>

/**

 * Created by Lokesh.

 * There are 4 classes to setup recyclerview, Adapter, ContactInfoModel,MyViewHolder and MainActivity.

 */

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRVContacts;

    private List<ContactInfoModel> mContactModelList;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mRVContacts = findViewById(R.id.contacts_rv);

        createDummyContactsList();

        setUpRecycleList();

    }

    private void createDummyContactsList() {

        mContactModelList = new ArrayList<>();

        ContactInfoModel member1Model = new ContactInfoModel();

        member1Model.setName("Rama");

        mContactModelList.add(member1Model);

        ContactInfoModel member2Model = new ContactInfoModel();

        member2Model.setName("Krishna");

        mContactModelList.add(member2Model);

        ContactInfoModel member3Model = new ContactInfoModel();

        member3Model.setName("Hanuman");

        mContactModelList.add(member3Model);

        //// TODO: 5/16/2018 go on for more rows..

    }

    private void setUpRecycleList() {

        Adapter adapter = new Adapter(mContactModelList);

        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);

        mRVContacts.setLayoutManager(layoutManager);

        mRVContacts.setAdapter(adapter);

    }

}

implementation 'com.android.support:recyclerview-v7:27.1.1'