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List an Category with Sub-category using NavigationView with ExpandableListView




build.gradle



    compile 'com.android.support:design:26.+'

**activity_main.xml**

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v4.widget.DrawerLayout 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:id="@+id/drawer"
        android:layout_height="match_parent"
        tools:context="np.com.sitalmandal.nav.MainActivity">
   
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
   
        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="Home"/>
    </LinearLayout>
   
        <android.support.design.widget.NavigationView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:menu="@menu/nav_menu"
            android:layout_gravity="start"
            >
   
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical">
   
                <ExpandableListView
                    android:id="@+id/lvExp"
                    android:layout_height="match_parent"
                    android:layout_width="match_parent"
                    android:cacheColorHint="#00000000"/>
   
            </LinearLayout>
        </android.support.design.widget.NavigationView>
    </android.support.v4.widget.DrawerLayout>

**list_group.xml**
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="8dp"
        android:background="#fff">
   
   
        <TextView
            android:id="@+id/lblListHeader"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
            android:textSize="17dp"
            android:textColor="#000" />
   
    </LinearLayout>

**list_item.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="55dip"
        android:orientation="vertical" >
   
        <TextView
            android:id="@+id/lblListItem"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textSize="17dip"
            android:paddingTop="5dp"
            android:paddingBottom="5dp"
            android:textColor="#000"
            android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />
   
    </LinearLayout>


**"menu" directory-> nav_menu.xml**

    <?xml version="1.0" encoding="utf-8"?>
    <menu xmlns:android="http://schemas.android.com/apk/res/android">
        <item
            android:id="@+id/action_settings"
            android:orderInCategory="100"
            android:showAsAction="never"
            android:title="@string/action_settings"/>
    </menu>


**MainActivity.java**

 

     public class MainActivity extends AppCompatActivity {

       private DrawerLayout mDrawerLayout;
        private ActionBarDrawerToggle mToggle;
   
        ExpandableListAdapter listAdapter;
        ExpandableListView expListView;
        List<String> listDataHeader;
        HashMap<String, List<String>> listDataChild;
   
   
   
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
   
            // Nav
            setContentView(R.layout.activity_main);
            mDrawerLayout= (DrawerLayout) findViewById(R.id.drawer);
            mToggle=new ActionBarDrawerToggle(this,mDrawerLayout,R.string.open,R.string.close);
            mDrawerLayout.addDrawerListener(mToggle);
            mToggle.syncState();
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
   
            // End Nav
   
   
   
   
            // get the listview
            expListView = (ExpandableListView) findViewById(R.id.lvExp);
   
            // preparing list data
            prepareListData();
   
            listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
   
            // setting list adapter
            expListView.setAdapter(listAdapter);
   
            // Listview Group click listener
            expListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
   
                @Override
                public boolean onGroupClick(ExpandableListView parent, View v,
                                            int groupPosition, long id) {
                    // Toast.makeText(getApplicationContext(),
                    // "Group Clicked " + listDataHeader.get(groupPosition),
                    // Toast.LENGTH_SHORT).show();
                    return false;
                }
            });
   
            // Listview Group expanded listener
            expListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
   
                @Override
                public void onGroupExpand(int groupPosition) {
                    Toast.makeText(getApplicationContext(),
                            listDataHeader.get(groupPosition) + " Expanded",
                            Toast.LENGTH_SHORT).show();
                }
            });
   
            // Listview Group collasped listener
            expListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
   
                @Override
                public void onGroupCollapse(int groupPosition) {
                    Toast.makeText(getApplicationContext(),
                            listDataHeader.get(groupPosition) + " Collapsed",
                            Toast.LENGTH_SHORT).show();
   
                }
            });
   
            // Listview on child click listener
            expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
   
                @Override
                public boolean onChildClick(ExpandableListView parent, View v,
                                            int groupPosition, int childPosition, long id) {
                    // TODO Auto-generated method stub
                    Toast.makeText(
                            getApplicationContext(),
                            listDataHeader.get(groupPosition)
                                    + " : "
                                    + listDataChild.get(
                                    listDataHeader.get(groupPosition)).get(
                                    childPosition), Toast.LENGTH_SHORT)
                            .show();
                    return false;
                }
            });
   
        }
   
        @Override
        public boolean onOptionsItemSelected(MenuItem item)
        {
            if ( mToggle.onOptionsItemSelected(item))
            {
                return true;
            }
            return super.onOptionsItemSelected(item);
   
        }
   
   
   
        /*
         * Preparing the list data
         */
        private void prepareListData() {
            listDataHeader = new ArrayList<String>();
            listDataChild = new HashMap<String, List<String>>();
   
            // Adding child data
            listDataHeader.add("Phones & Tablets");
            listDataHeader.add("Man's Fashion");
            listDataHeader.add("Woman's Fashion");
            listDataHeader.add("Coming Soon..");
   
            // Adding child data
            List<String> phonetablets = new ArrayList<String>();
            phonetablets.add("Samsung");
            phonetablets.add("Apple");
            phonetablets.add("TABLETS: Part II");
            phonetablets.add("Samsung");
            phonetablets.add("Apple");
            phonetablets.add("Huawei");
   
   
            List<String> manfashions = new ArrayList<String>();
            manfashions.add("T-shirts");
            manfashions.add("Shirts");
            manfashions.add("Jackets & Coats");
            manfashions.add("Windcheater");
            manfashions.add("Hoodies");
            manfashions.add("Sports Wear");
   
            List<String> womanfashions = new ArrayList<String>();
            womanfashions.add("shirts");
            womanfashions.add("Windcheater");
            womanfashions.add("Hoodies");
            womanfashions.add("The Canyons");
            womanfashions.add("Sports");
   
   
            List<String> comingSoon = new ArrayList<String>();
            comingSoon.add("2 Guns");
            comingSoon.add("The Smurfs 2");
            comingSoon.add("The Spectacular Now");
            comingSoon.add("The Canyons");
            comingSoon.add("Europa Report");
   
   
   
            listDataChild.put(listDataHeader.get(0), phonetablets); // Header, Child data
            listDataChild.put(listDataHeader.get(1), manfashions);
            listDataChild.put(listDataHeader.get(2), womanfashions);
            listDataChild.put(listDataHeader.get(3), comingSoon);
   
        }
    }

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