Recyclerview with models/pojos

This tutorial makes you develop sample RecyclerView which shows contacts as list. Here Models/pojo's used.

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);
    }
}

activity_main.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="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>

row_layout.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">
    <!-- 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);
    }
}

build.gradle(app)

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