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Saturday 26 May 2012

create custom expandable list in android.

This example shows how to create custom expandable list in android.
Algorithm:
1.)  Create a new project by File-> New -> Android Project name it CustomExpandableList.
2.)  Run for output.
Steps:
1.) Create a project named CustomExpandableList and set the information as stated in the image.
Build Target: Android 4.0
Application Name: CustomExpandableList
Package Name: com. example. CustomExpandableList
Activity Name: CustomExpandableList
Min SDK Version: 14
2.) Open CustomExpandableList.java file and write following code there:
<strong>packagestrong> com.example.CustomExpandableList;
<strong>importstrong> android.app.ExpandableListActivity;
<strong>importstrong> android.os.Bundle;
<strong>importstrong> android.view.ContextMenu;
<strong>importstrong> android.view.ContextMenu.ContextMenuInfo;
<strong>importstrong> android.view.Gravity;
<strong>importstrong> android.view.MenuItem;
<strong>importstrong> android.view.View;
<strong>importstrong> android.view.ViewGroup;
<strong>importstrong> android.widget.AbsListView;
<strong>importstrong> android.widget.BaseExpandableListAdapter;
<strong>importstrong> android.widget.ExpandableListAdapter;
<strong>importstrong> android.widget.ExpandableListView;
<strong>importstrong>android.widget.ExpandableListView.ExpandableListContextMenuInfo;
<strong>importstrong> android.widget.TextView;
<strong>importstrong> android.widget.Toast;
<strong>publicstrong> <strong>classstrong> CustomExpandableList<strong>extendsstrong> ExpandableListActivity {
ExpandableListAdapter mAdapter;
@Override
<strong>publicstrong> <strong>voidstrong> onCreate(Bundle savedInstanceState){
<strong>superstrong>.onCreate(savedInstanceState);
// Set up our adapter
mAdapter = <strong>newstrong> MyExpandableListAdapter();
setListAdapter(mAdapter);
registerForContextMenu(getExpandableListView());
}
@Override
<strong>publicstrong> <strong>voidstrong> onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
menu.setHeaderTitle("Sample menu");
menu.add(000"Sample action");
}
@Override
<strong>publicstrong> <strong>booleanstrong> onContextItemSelected(MenuItemitem) {
ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo)item.getMenuInfo();
String title = ((TextView) info.targetView).getText().toString();
<strong>intstrong> type =ExpandableListView.<em>getPackedPositionTypeem>(info.packedPosition);
<strong>ifstrong> (type ==ExpandableListView.<em>PACKED_POSITION_TYPE_CHILDem>) {
<strong>intstrong> groupPos =ExpandableListView.<em>getPackedPositionGroupem>(info.packedPosition);
<strong>intstrong> childPos =ExpandableListView.<em>getPackedPositionChildem>(info.packedPosition);
Toast.<em>makeTextem>(<strong>thisstrong>, title + ": Child " + childPos + " clicked in group " + groupPos,
Toast.<em>LENGTH_SHORTem>).show();
<strong>returnstrong> <strong>truestrong>;
} <strong>elsestrong> <strong>ifstrong> (type ==ExpandableListView.<em>PACKED_POSITION_TYPE_GROUPem>) {
<strong>intstrong> groupPos =ExpandableListView.<em>getPackedPositionGroupem>(info.packedPosition);
Toast.<em>makeTextem>(<strong>thisstrong>, title + ": Group " + groupPos + " clicked", Toast.<em>LENGTH_SHORTem>).show();
<strong>returnstrong> <strong>truestrong>;
}
<strong>returnstrong> <strong>falsestrong>;
}
<strong>publicstrong> <strong>classstrong> MyExpandableListAdapter<strong>extendsstrong> BaseExpandableListAdapter {
<strong>privatestrong> String[] groups = { "Android Versions""Android Phones"};
<strong>privatestrong> String[][] children = {
{ "IceCream Sandwitch""Gingerboard""Android 2.0""Android 1.6" },
{ "Razr""Sony Ericsson""Galaxy Tab""Galaxy" }
};
<strong>publicstrong> Object getChild(<strong>intstrong> groupPosition,<strong>intstrong> childPosition) {
<strong>returnstrong> children[groupPosition][childPosition];
}
<strong>publicstrong> <strong>longstrong> getChildId(<strong>intstrong>groupPosition, <strong>intstrong> childPosition) {
<strong>returnstrong> childPosition;
}
<strong>publicstrong> <strong>intstrong>getChildrenCount(<strong>intstrong> groupPosition) {
<strong>returnstrong> children[groupPosition].length;
}
<strong>publicstrong> TextView getGenericView() {
AbsListView.LayoutParams lp = <strong>newstrong> AbsListView.LayoutParams(
ViewGroup.LayoutParams.<em>MATCH_PARENTem>, 64);
&nbsp;
TextView textView = <strong>newstrong>TextView(CustomExpandableList.<strong>thisstrong>);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.<em>CENTER_VERTICALem> | Gravity.<em>LEFTem>);
textView.setPadding(36, 0, 0, 0);
<strong>returnstrong> textView;
}
<strong>publicstrong> View getChildView(<strong>intstrong> groupPosition,<strong>intstrong> childPosition, <strong>booleanstrong> isLastChild,
View convertView, ViewGroup parent) {
TextView textView = getGenericView();
textView.setText(getChild(groupPosition, childPosition).toString());
<strong>returnstrong> textView;
}
<strong>publicstrong> Object getGroup(<strong>intstrong> groupPosition) {
<strong>returnstrong> groups[groupPosition];
}
<strong>publicstrong> <strong>intstrong> getGroupCount() {
<strong>returnstrong> groups.length;
}
<strong>publicstrong> <strong>longstrong> getGroupId(<strong>intstrong>groupPosition) {
<strong>returnstrong> groupPosition;
}
<strong>publicstrong> View getGroupView(<strong>intstrong> groupPosition,<strong>booleanstrong> isExpanded, View convertView,
ViewGroup parent) {
TextView textView = getGenericView();
textView.setText(getGroup(groupPosition).toString());
<strong>returnstrong> textView;
}
<strong>publicstrong> <strong>booleanstrong>isChildSelectable(<strong>intstrong> groupPosition, <strong>intstrong>childPosition) {
<strong>returnstrong> <strong>truestrong>;
}
<strong>publicstrong> <strong>booleanstrong> hasStableIds() {
<strong>returnstrong> <strong>truestrong>;
}
}
}
3.) Compile and build the project.
Output