ExpandableListView 是ListView的子类,它把应用中的列表项分为几组,每组里可包含多个列表项. 所显示的列表项应该由ExpandableListAdapter 接口提供,实现ExpandableListAdapter有三种常用方式:
扩展BaseExpandableListAdapter 实现 ExpandableListAdapter ;
使用SimpleExpandableListAdapter 将两个list 集合包装成ExpandableListAdapter;
使用SimpleCursorTreeAdapter 将Cursor中的数据包装成SimpleCursorTreeAdapter;
ExpandableListView 支持常用属性:
android:childDivider 指定各组内各子列表的分割条
android:childIndicator 显示在子列表项旁边的Drawable 对象
android:groupIndicator 显示在组列表项旁边的Drawable对象.
public class ExpandableListViewTest extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//创建一个BaseExpandableListAdapter对象
ExpandableListAdapter adapter = new BaseExpandableListAdapter()
{
int[] logos = new int[]
{
R.drawable.p,
R.drawable.z,
R.drawable.t
};
private String[] armTypes = new String[]
{ "神族兵种", "虫族兵种", "人族兵种"};
private String[][] arms = new String[][]
{
{ "狂战士", "龙骑士", "黑暗圣堂", "电兵" },
{ "小狗", "刺蛇", "飞龙", "自爆飞机" },
{ "机枪兵", "护士MM" , "幽灵" }
};
// 获取指定组位置、指定子列表项处的子列表项数据
@Override
public Object getChild(int groupPosition, int childPosition)
{
return arms[groupPosition][childPosition];
} @Override
public long getChildId(int groupPosition, int childPosition)
{
return childPosition;
} @Override
public int getChildrenCount(int groupPosition)
{
return arms[groupPosition].length;
} private TextView getTextView()
{
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, 64);
TextView textView = new TextView(ExpandableListViewTest.this);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
textView.setPadding(36, 0, 0, 0);
textView.setTextSize(20);
return textView;
} // 该方法决定每个子选项的外观
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent)
{
TextView textView = getTextView();
textView.setText(getChild(groupPosition, childPosition)
.toString());
return textView;
} // 获取指定组位置处的组数据
@Override
public Object getGroup(int groupPosition)
{
return armTypes[groupPosition];
} @Override
public int getGroupCount()
{
return armTypes.length;
} @Override
public long getGroupId(int groupPosition)
{
return groupPosition;
} // 该方法决定每个组选项的外观
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent)
{
LinearLayout ll = new LinearLayout(ExpandableListViewTest.this);
ll.setOrientation(0);
ImageView logo = new ImageView(ExpandableListViewTest.this);
logo.setImageResource(logos[groupPosition]);
ll.addView(logo);
TextView textView = getTextView();
textView.setText(getGroup(groupPosition).toString());
ll.addView(textView);
return ll;
} @Override
public boolean isChildSelectable(int groupPosition,
int childPosition)
{
return true;
} @Override
public boolean hasStableIds()
{
return true;
}
};
ExpandableListView expandListView = (ExpandableListView) findViewById(R.id.list);
expandListView.setAdapter(adapter);
}
}