Question

I need an ExpandableList in my Android app. By extending ExpandableListActivity whose content view is as the following:

<?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="fill_parent"
   android:orientation="vertical" >

   <ExpandableListView
      android:id="@id/android:list"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" />

   <TextView
      android:id="@+id/tv_add"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:text="@string/txt_add" />
</LinearLayout>  

and extending BaseExpandableListAdapter I am now able to display data of groups and children in a TextView.
However, I want to customize the view of children. How may I be able to do so through another xml file?

EDIT:
Here’s my row.xml for the view of children:

<?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="fill_parent"
  android:orientation="vertical" >

 <TextView 
     android:id="@+id/title"
     android:textSize="16sp"
     android:textStyle="bold"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:gravity="left"
 />

 <TextView 
     android:id="@+id/description"
     android:textSize="10sp"
     android:textStyle="normal"
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content"
     android:gravity="left"
 />
</LinearLayout>

Answer 1

Thx to PRC, but according to my row.xml, the correct version of getChildView would be

 @Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
        View convertView, ViewGroup parent) {
    LinearLayout layout;
    Vehicle vehicle = (Vehicle) getChild(groupPosition, childPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        layout = (LinearLayout) infalInflater.inflate(R.layout.child_layout, null);
    }
    TextView tv = (TextView) convertView.findViewById(R.id.tvChild);
    tv.setText("   " + vehicle.getName());
    return layout;
}