1. main_activity.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ExpandableListView
android:id="@+id/expandableList"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
2. list_group.xml
<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="10dp" >
<TextView
android:id="@+id/listHeader"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
android:textSize="16sp" />
</LinearLayout>
3. list_item.xml
<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/listItem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="17dip"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />
</LinearLayout>
Now we have to create ExpandableListAdapter.java like this...
For import -> ctrl + alt +o
public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> listDataHeader; // header titles
private HashMap<String, List<String>> listDataChild;
public ExpandableListAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<String>> listChildData) {
this.context = context;
this.listDataHeader = listDataHeader;
this.listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this.listDataChild.get(this.listDataHeader.get(groupPosition))
.get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item, null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.listItem);
txtListChild.setText(childText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this.listDataChild.get(this.listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this.listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this.listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.listHeader);
lblListHeader.setTypeface(null, Typeface.BOLD); //bold the header
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
Finally MainActivity.java goes like this...
For import ctrl + alt + o
public class MainActivity extends Activity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.expandableList);
getPrepareListData(); // preparing list data
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
expListView.setAdapter(listAdapter); //set the list adapter
// Listview Group click listener
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
//do ur task
return false;
}
});
// Listview Group expanded listener
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
//do ur task
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
//do ur task
}
});
// Listview on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
//do ur task
return false;
}
});
}
private void getPrepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding header data
listDataHeader.add("For One Room");
listDataHeader.add("For Two Rooms");
listDataHeader.add("For Flat");
listDataHeader.add("For House");
listDataHeader.add("For Apartment");
// Adding child data
List<String> one_room = new ArrayList<String>();
one_room.add("1 room at baneshwor, kathmandu");
one_room.add("1 room at sundhara, kathmandu");
one_room.add("1 room at pulchowk, lalitpur");
one_room.add("1 room at gwarko, lalitpur");
one_room.add("1 room at sundhara, lalitpur");
one_room.add("1 room at balkumari, lalitpur");
one_room.add("1 room at lazimpat, kathmandu");
List<String> two_room = new ArrayList<String>();
two_room.add("2 rooms at baneshwor, kathmandu");
two_room.add("2 rooms at sundhara, kathmandu");
List<String> flat = new ArrayList<String>();
flat.add("1 flat at baneshwor, kathmandu");
flat.add("1 flat at sundhara, kathmandu");
listDataChild.put(listDataHeader.get(0), one_room); // Header, Child listDataChild.put(listDataHeader.get(1), two_room);
listDataChild.put(listDataHeader.get(2), flat); //you can add others here
}
}
