Technology The Creativity !

Expandable listview in android public class MainActivity extends Activity {         private SettingsListAdapter adapter;     private ExpandableListView categoriesList;     private ArrayList<Category> categories;         protected Context mContext;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         mContext = this;         categoriesList = (ExpandableListView)findViewById(R.id.categories);         categories = Category.getCategories();         adapter = new SettingsListAdapter(this,                 categori...