Custom Expandable List Example

Description:
This example shows how to create Expandable list using custom adapter.
Algorithm:

1.) Create a new project by File-> New -> Android Project name it CustomExpandableListExample.
2.) Run for output.

Steps:
1.) Create a project named CustomExpandableListExample and set the information as stated in the image.

Build Target: Android 2.3.3
Application Name: CustomExpandableListExample
Package Name: com.example
Activity Name: CustomExpandableListExampleActivity
Min SDK Version: 10

2.) Open CustomExpandableListExampleActivity.java file and write following code there:

package com.example; import android.app.ExpandableListActivity; import android.os.Bundle; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.Gravity; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ExpandableListView.ExpandableListContextMenuInfo; import android.widget.TextView; import android.widget.Toast; public class CustomExpandableListExampleActivity extends ExpandableListActivity {     ExpandableListAdapter mAdapter;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         // Set up our adapter         mAdapter = new MyExpandableListAdapter();         setListAdapter(mAdapter);         registerForContextMenu(getExpandableListView());     }     @Override     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {         menu.setHeaderTitle("Sample menu");         menu.add(0, 0, 0, "Sample action");     }           @Override     public boolean onContextItemSelected(MenuItem item) {         ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();         String title = ((TextView) info.targetView).getText().toString();                   int type = ExpandableListView.getPackedPositionType(info.packedPosition);         if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {             int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);             int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);             Toast.makeText(this, title + ": Child " + childPos + " clicked in group " + groupPos,                     Toast.LENGTH_SHORT).show();             return true;         } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {             int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);             Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show();             return true;         }                   return false;     }     public class MyExpandableListAdapter extends BaseExpandableListAdapter {         // Sample data set.  children[i] contains the children (String[]) for groups[i].         private String[] groups = { "Names", "Designation", "Gender", "Company" };         private String[][] children = {                 { "abc", "xyz", "ash", "anu" },                 { "SSE", "TJ", "PM", "SE" },                 { "Male", "Female" },                 { "yyyyyy", "xxxxx" }         };                   public Object getChild(int groupPosition, int childPosition) {             return children[groupPosition][childPosition];         }         public long getChildId(int groupPosition, int childPosition) {             return childPosition;         }         public int getChildrenCount(int groupPosition) {             return children[groupPosition].length;         }         public TextView getGenericView() {             // Layout parameters for the ExpandableListView             AbsListView.LayoutParams lp = new AbsListView.LayoutParams(                     ViewGroup.LayoutParams.MATCH_PARENT, 64);             TextView textView = new TextView(CustomExpandableListExampleActivity.this);             textView.setLayoutParams(lp);             // Center the text vertically             textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);             // Set the text starting position             textView.setPadding(36, 0, 0, 0);             return textView;         }                   public View getChildView(int groupPosition, int childPosition, boolean isLastChild,                 View convertView, ViewGroup parent) {             TextView textView = getGenericView();             textView.setText(getChild(groupPosition, childPosition).toString());             return textView;         }         public Object getGroup(int groupPosition) {             return groups[groupPosition];         }         public int getGroupCount() {             return groups.length;         }         public long getGroupId(int groupPosition) {             return groupPosition;         }         public View getGroupView(int groupPosition, boolean isExpanded, View convertView,                 ViewGroup parent) {             TextView textView = getGenericView();             textView.setText(getGroup(groupPosition).toString());             return textView;         }         public boolean isChildSelectable(int groupPosition, int childPosition) {             return true;         }         public boolean hasStableIds() {             return true;         }     } }

3.) Compile and build the project.

Output