Deepshikha Puri: Mobile App Developer (Android & iOS))

Video Demo:
In this tutorial I am using expandable listview with default navigation drawer. Download source code from here

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >


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

        <LinearLayout
            android:id="@+id/container_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

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

    <RelativeLayout
        android:layout_width="match_parent"
        android:background="#234E6F"
        android:layout_height="60dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:textColor="#ffffff"
            android:layout_centerInParent="true"
            android:textStyle="bold"
            android:id="@+id/tv_name"/>


        <ImageView
            android:layout_width="25dp"
            android:layout_centerVertical="true"
            android:layout_height="30dp"
            android:layout_marginLeft="10dp"
            android:src="@drawable/menu_icon"/>
        <RelativeLayout
            android:layout_width="40dp"
            android:id="@+id/rl_menu"
            android:layout_height="match_parent"></RelativeLayout>

    </RelativeLayout>

        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
</LinearLayout>

    </LinearLayout>
    <LinearLayout
        android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:orientation="vertical"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#FFFFFF">

        <include layout="@layout/menu_layout"></include>

    </LinearLayout>

</android.support.v4.widget.DrawerLayout>

<?xml version="1.0" encoding="utf-8"?>

<ScrollView android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF"
    android:orientation="vertical">


    <RelativeLayout
        android:id="@+id/rl_profile"
        android:layout_width="match_parent"
        android:layout_height="150dp">

        <ImageView

            android:id="@+id/iv_image"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_centerVertical="true"
            android:src="@drawable/profile_image" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="20dp"
            android:layout_toRightOf="@+id/iv_image"
            android:text="David"
            android:textColor="#000000"
            android:textSize="15dp" />


    </RelativeLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="#EAEAEA"></View>


    <ExpandableListView
        android:id="@+id/ev_menu"
        android:nestedScrollingEnabled="false"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </ExpandableListView>
</LinearLayout>
</ScrollView>

package com.deepshikha.navigationdrawer;

import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    ArrayList al_main = new ArrayList<>();
    ExpandableListView ev_list;
    CountryAdapter obj_adapter;
    String TAG = "MainActivity";
    private DrawerLayout mDrawerLayout;
    HomeFragment fragment;
    TextView tv_name;
    RelativeLayout rl_menu;

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

    }

    private void init() {

        getSupportActionBar().hide();
        ev_list = (ExpandableListView) findViewById(R.id.ev_menu);
        tv_name = (TextView) findViewById(R.id.tv_name);
        rl_menu = (RelativeLayout) findViewById(R.id.rl_menu);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        obj_adapter = new CountryAdapter(MainActivity.this, al_main);
        ev_list.setAdapter(obj_adapter);
        ev_list.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                                        int groupPosition, long id) {
                setListViewHeight(parent, groupPosition);
                return false;
            }
        });

        setExpandableListViewHeightBasedOnChildren(ev_list);

        fragment = new HomeFragment();
        Bundle bundle = new Bundle();
        bundle.putString("name", al_main.get(0).getStr_country());
        bundle.putString("des", al_main.get(0).getAl_state().get(0).getStr_description());
        bundle.putString("dish", al_main.get(0).getAl_state().get(0).getStr_name());
        bundle.putString("image", al_main.get(0).getAl_state().get(0).getStr_image());
        tv_name.setText(al_main.get(0).getStr_country());

        fragment.setArguments(bundle);
        getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, fragment, "HomeFragment").addToBackStack("null").commit();


        rl_menu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mDrawerLayout.openDrawer(Gravity.LEFT);
            }
        });
    }

    private void setListViewHeight(ExpandableListView listView, int group) {
        ExpandableListAdapter listAdapter = (ExpandableListAdapter) listView.getExpandableListAdapter();
        int totalHeight = 0;
        int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(),
                View.MeasureSpec.EXACTLY);
        for (int i = 0; i < listAdapter.getGroupCount(); i++) {
            View groupItem = listAdapter.getGroupView(i, false, null, listView);
            groupItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);

            totalHeight += groupItem.getMeasuredHeight();

            if (((listView.isGroupExpanded(i)) && (i != group))
                    || ((!listView.isGroupExpanded(i)) && (i == group))) {
                for (int j = 0; j < listAdapter.getChildrenCount(i); j++) {
                    View listItem = listAdapter.getChildView(i, j, false, null,
                            listView);
                    listItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);

                    totalHeight += listItem.getMeasuredHeight();

                }
            }
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        int height = totalHeight
                + (listView.getDividerHeight() * (listAdapter.getGroupCount() - 1));
       /* if (height < 10)
            height = 200;*/
        params.height = height;
        listView.setLayoutParams(params);
        listView.requestLayout();

    }

    private void fn_data() {

        String str_data = loadJSONFromAsset();

        try {
            JSONObject jsonObject_country = new JSONObject(str_data);
            JSONArray jsonArray_country = jsonObject_country.getJSONArray("country");
            al_main = new ArrayList<>();
            for (int i = 0; i < jsonArray_country.length(); i++) {
                Model_country obj_country = new Model_country();
                JSONObject jsonObject = jsonArray_country.getJSONObject(i);
                JSONArray jsonArray_dishes = jsonObject.getJSONArray("dishes");
                ArrayList al_dishes = new ArrayList<>();
                for (int j = 0; j < jsonArray_dishes.length(); j++) {

                    JSONObject jsonObject_dishes = jsonArray_dishes.getJSONObject(j);
                    Model_Dish obj_dish = new Model_Dish();
                    obj_dish.setStr_name(jsonObject_dishes.getString("dishname"));
                    obj_dish.setStr_description(jsonObject_dishes.getString("description"));
                    obj_dish.setStr_image(jsonObject_dishes.getString("image"));
                    al_dishes.add(obj_dish);
                }

                obj_country.setAl_state(al_dishes);
                obj_country.setStr_country(jsonObject.getString("name"));

                al_main.add(obj_country);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

    public static void setExpandableListViewHeightBasedOnChildren(ExpandableListView expandableListView) {
        CountryAdapter adapter = (CountryAdapter) expandableListView.getExpandableListAdapter();
        if (adapter == null) {
            return;
        }
        int totalHeight = expandableListView.getPaddingTop() + expandableListView.getPaddingBottom();
        for (int i = 0; i < adapter.getGroupCount(); i++) {
            View groupItem = adapter.getGroupView(i, false, null, expandableListView);
            groupItem.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
            totalHeight += groupItem.getMeasuredHeight();

            if (expandableListView.isGroupExpanded(i)) {
                for (int j = 0; j < adapter.getChildrenCount(i); j++) {
                    View listItem = adapter.getChildView(i, j, false, null, expandableListView);
                    listItem.setLayoutParams(new ViewGroup.LayoutParams(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED));
                    listItem.measure(View.MeasureSpec.makeMeasureSpec(0,
                            View.MeasureSpec.UNSPECIFIED), View.MeasureSpec
                            .makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
                    totalHeight += listItem.getMeasuredHeight();

                }
            }
        }

        ViewGroup.LayoutParams params = expandableListView.getLayoutParams();
        int height = totalHeight + expandableListView.getDividerHeight() * (adapter.getGroupCount() - 1);

        if (height < 10)
            height = 100;
        params.height = height;
        expandableListView.setLayoutParams(params);
        expandableListView.requestLayout();
    }

    public String loadJSONFromAsset() {
        String json = null;
        try {

            InputStream is = getAssets().open("dishes.json");

            int size = is.available();

            byte[] buffer = new byte[size];

            is.read(buffer);

            is.close();

            json = new String(buffer, "UTF-8");


        } catch (IOException ex) {
            ex.printStackTrace();
            return null;
        }

        Log.e(TAG, "Json response " + json);
        return json;

    }

    public void fn_selectedPosition(int group, int child) {

        fragment = new HomeFragment();
        Bundle bundle = new Bundle();
        bundle.putString("name", al_main.get(group).getStr_country());
        bundle.putString("des", al_main.get(group).getAl_state().get(child).getStr_description());
        bundle.putString("dish", al_main.get(group).getAl_state().get(child).getStr_name());
        bundle.putString("image", al_main.get(group).getAl_state().get(child).getStr_image());
        fragment.setArguments(bundle);

        getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, fragment, "HomeFragment").addToBackStack("null").commit();
        mDrawerLayout.closeDrawer(Gravity.LEFT);

        tv_name.setText(al_main.get(group).getStr_country());
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
        finish();
    }
}

package com.deepshikha.navigationdrawer;

import java.util.ArrayList;

/**
 * Created by deepshikha on 12/7/17.
 */

public class Model_country {
    String str_country;
    ArrayList al_state;
    public Model_country() {
    }

    public Model_country(String str_country, ArrayList al_state) {
        this.str_country = str_country;
        this.al_state = al_state;
    }


    public String getStr_country() {
        return str_country;
    }

    public void setStr_country(String str_country) {
        this.str_country = str_country;
    }

    public ArrayList getAl_state() {
        return al_state;
    }

    public void setAl_state(ArrayList al_state) {
        this.al_state = al_state;
    }
}

package com.deepshikha.navigationdrawer;

/**
 * Created by deepshikha on 12/7/17.
 */

public class Model_Dish {
    String str_name;
    String str_description;
    String str_image;

    public Model_Dish(String str_name, String str_description, String str_image) {
        this.str_name = str_name;
        this.str_description = str_description;
        this.str_image = str_image;
    }

    public String getStr_image() {
        return str_image;
    }

    public void setStr_image(String str_image) {
        this.str_image = str_image;
    }

    public Model_Dish() {

    }



    public String getStr_name() {
        return str_name;
    }

    public void setStr_name(String str_name) {
        this.str_name = str_name;
    }

    public String getStr_description() {
        return str_description;
    }

    public void setStr_description(String str_description) {
        this.str_description = str_description;
    }
}

<?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:background="#FFFFFF"
    android:orientation="vertical">

<RelativeLayout
    android:layout_width="match_parent"
    android:background="#FFFFFF"
    android:layout_height="240dp">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_marginTop="20dp"
        android:scaleType="centerCrop"
        android:id="@+id/iv_image"/>
</RelativeLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Dish Name"
        android:textSize="25dp"
        android:id="@+id/tv_dishname"
        android:gravity="center"
        android:textStyle="bold"
        android:textColor="#000000"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Dish Name"
        android:textSize="18dp"
        android:padding="10dp"
        android:layout_marginTop="5dp"
        android:id="@+id/tv_description"
        android:gravity="left"
        android:textColor="#000000"
        />

</LinearLayout>

package com.deepshikha.navigationdrawer;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;


public class HomeFragment extends Fragment {

    View view;
    TextView  tv_dishname, tv_description;
    ImageView iv_image;
    String str_name, str_disname, str_des, str_imagename;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_home, container, false);
        init();
        return view;
    }

    private void init() {

        str_name = getArguments().getString("name");
        str_disname = getArguments().getString("dish");
        str_des = getArguments().getString("des");
        str_imagename = getArguments().getString("image");
//        str_imagename = "chinese";
        tv_dishname = (TextView) view.findViewById(R.id.tv_dishname);
        tv_description = (TextView) view.findViewById(R.id.tv_description);
        iv_image = (ImageView) view.findViewById(R.id.iv_image);


        tv_dishname.setText(str_disname);
        tv_description.setText(str_des);

        int resourceImage = getActivity().getResources().getIdentifier(str_imagename, "drawable", getActivity().getPackageName());
        iv_image.setImageResource(resourceImage);


    }


}

<?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:layout_marginLeft="20dp"
    android:paddingLeft="50dp"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:textSize="15dp"
        android:gravity="center_vertical"
        android:textColor="#000000"
        android:id="@+id/tv_name"/>



</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="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textSize="15dp"
        android:paddingLeft="10dp"
        android:gravity="center_vertical"
        android:textColor="#ffffff"
        android:background="#234E6F"
        android:id="@+id/tv_name"/>

</LinearLayout>

package com.deepshikha.navigationdrawer;

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

import java.util.ArrayList;

/**
 * Created by deepshikha on 12/7/17.
 */

public class CountryAdapter extends BaseExpandableListAdapter {
    Context context;
    ArrayList al_country;

    public CountryAdapter(Context context, ArrayList al_country) {
        this.context = context;
        this.al_country = al_country;
    }

    @Override
    public int getGroupCount() {
        return al_country.size();
    }

    @Override
    public int getChildrenCount(int i) {
        return al_country.get(i).getAl_state().size();
    }

    @Override
    public Object getGroup(int i) {
        return al_country.get(i);
    }

    @Override
    public Object getChild(int i, int i1) {
        return al_country.get(i).getAl_state().get(i1);
    }

    @Override
    public long getGroupId(int i) {
        return i;
    }

    @Override
    public long getChildId(int i, int i1) {
        return i1;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
        if (view==null){

            LayoutInflater layoutInflater = (LayoutInflater) this.context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = layoutInflater.inflate(R.layout.adapter_header, null);
        }
        TextView tv_state = (TextView)view.findViewById(R.id.tv_name);
        tv_state.setText(al_country.get(i).getStr_country());
        return view;
    }

    @Override
    public View getChildView(final int i, final int i1, boolean b, View view, ViewGroup viewGroup) {
        if (view==null){

            LayoutInflater layoutInflater = (LayoutInflater) this.context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = layoutInflater.inflate(R.layout.adapter_childview, null);
        }

        TextView tv_state = (TextView)view.findViewById(R.id.tv_name);

        tv_state.setText(al_country.get(i).getAl_state().get(i1).getStr_name());
        tv_state.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((MainActivity)context).fn_selectedPosition(i,i1);
            }
        });
        return view;
    }

    @Override
    public boolean isChildSelectable(int i, int i1) {
        return false;
    }


}