ExpandableListView的用法和ListView非常像，只是其所显示的列表项应该由ExpandableListAdapter提供，下面是它的xml属性及说明：
然而，接下来是用事实说话了：
--------------------------------------------------------------------------------
1、该项目的布局文件非常简单，和ListView差不多，此处就不贴出代码了。
2、ExpandableListViewActivity.java关键代码如下：
（要定义一个全局的私有的listView变量）
listView = (ExpandableListView) findViewById(R.id.list);
MyExpandableListAdapter adapter = new MyExpandableListAdapter();
listView.setAdapter(adapter);
3、MyExpandableListAdapter代码如下：
public class MyExpandableListAdapter implements ExpandableListAdapter {
int[] logos = new int[]{
R.drawable.word,
R.drawable.excel,
R.drawable.email,
R.drawable.ppt
};
private String[] armTypes = new String[]{
"WORD", "EXCEL", "EMAIL", "PPT"
};
private String[][] arms = new String[][]{
{"文档编辑", "文档排版", "文档处理", "文档打印"},
{"表格编辑", "表格排版", "表格处理", "表格打印"},
{"收发邮件", "管理邮箱", "登录登出", "注册绑定"},
{"演示编辑", "演示排版", "演示处理", "演示打印"},
};
@Override
public void registerDataSetObserver(DataSetObserver observer) {
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
}
@Override
public int getGroupCount() {
return armTypes.length;
}
@Override
public int getChildrenCount(int groupPosition) {
return arms[groupPosition].length;
}
@Override
public Object getGroup(int groupPosition) {
return armTypes[groupPosition];
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return arms[groupPosition][childPosition];
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
LinearLayout ll = new LinearLayout(ExpandableListViewActivity.this);
ll.setOrientation(LinearLayout.HORIZONTAL);
ImageView logo = new ImageView(ExpandableListViewActivity.this);
logo.setImageResource(logos[groupPosition]);
logo.setPadding(, , , );
ll.addView(logo);
TextView textView = getTextView();
textView.setText(getGroup(groupPosition).toString());
textView.setPadding(, , , );
ll.addView(textView);
return ll;
}
@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;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
@Override
public boolean areAllItemsEnabled() {
return false;
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public void onGroupExpanded(int groupPosition) {
}
@Override
public void onGroupCollapsed(int groupPosition) {
}
@Override
public long getCombinedChildId(long groupId, long childId) {
return ;
}
@Override
public long getCombinedGroupId(long groupId) {
return ;
}
private TextView getTextView() {
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, );
TextView textView = new TextView(ExpandableListViewActivity.this);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
textView.setPadding(, , , );
textView.setTextSize();
return textView;
}
}
代码上面没有做多少注释，在这里说明一下吧：
该adapter有两个关键方法：getChildView（）和getGroupView（）；
----------前者返回的view对象作为子列表项，后者返回的view作为组列表项。
4、下面是该程序的运行界面了：
