ashishkudale

public class Chapter {
    public int id;
    public String chapterName;
    public String imageUrl;
}

ashishkudale

public class Subject {
    public int id;
    public String subjectName;
    public ArrayList<Chapter> chapters;
}

ashishkudale

private ArrayList<Subject> prepareData() {
    ArrayList<Subject> subjects = new ArrayList<Subject>();

    Subject physics = new Subject();
    physics.id = 1;
    physics.subjectName = "Physics";
    physics.chapters = new ArrayList<Chapter>();

    Chapter chapter1 = new Chapter();
    chapter1.id = 1;

ashishkudale

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_margin="5dp"
        android:layout_gravity="center"

ashishkudale

private ArrayList<Subject> prepareData() {
    ArrayList<Subject> subjects = new ArrayList<Subject>();

    Subject physics = new Subject();
    physics.id = 1;
    physics.subjectName = "Physics";
    physics.chapters = new ArrayList<Chapter>();

    Chapter chapter1 = new Chapter();
    chapter1.id = 1;

ashishkudale

<?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">

    <LinearLayout
        android:orientation="vertical"
        android:background="#FFFFFF"
        android:layout_width="match_parent"

ashishkudale

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="com.ashishkudale.list_in_list.HomeActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rvSubject"

ashishkudale

public class ChapterAdapter extends RecyclerView.Adapter<ChapterAdapter.CustomViewHolder> {

    private Context context;
    private ArrayList<Chapter> chapters;
    private LayoutInflater inflater;

    public ChapterAdapter(Context context, ArrayList<Chapter> chapters) {
        this.context = context;
        this.chapters = chapters;
        this.inflater = LayoutInflater.from(context);

ashishkudale

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

    public ArrayList<Subject> subjects;
    private Context context;
    private LayoutInflater layoutInflater;

    public SubjectAdapter(ArrayList<Subject> subjects, Context context) {
        this.subjects = subjects;
        this.context = context;
        this.layoutInflater = LayoutInflater.from(context);

ashishkudale

public class HomeActivity extends AppCompatActivity {

    private RecyclerView rvSubject;
    private SubjectAdapter subjectAdapter;
    private ArrayList<Subject> subjects;

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