android ExpandableListActivity 练习

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public class MainActivity extends ExpandableListActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        ExpandableListAdapter adapter = new ExpandableListAdapter() {            String[] groups = new String[]                    { "神族兵种", "虫族兵种", "人族兵种"};            String[][] child = 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" }                    };            @Override            public void registerDataSetObserver(DataSetObserver observer) {            }            @Override            public void unregisterDataSetObserver(DataSetObserver observer) {            }            @Override            public int getGroupCount() {                return groups.length;            }            @Override            public int getChildrenCount(int groupPosition) {                return child[groupPosition].length;            }            @Override            public Object getGroup(int groupPosition) {                return groups[groupPosition];            }            @Override            public Object getChild(int groupPosition, int childPosition) {                return child[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) {                TextView v;                if (convertView == null){                    v = new TextView(MainActivity.this);                    v.setPadding(45,0,0,0);                    v.setTextSize(20);                }else{                    v = (TextView) convertView;                }                v.setText(groups[groupPosition]);                return v;            }            @Override            public View getChildView(int groupPosition, int childPosition,                                     boolean isLastChild, View convertView, ViewGroup parent) {                TextView v;                if (convertView == null){                    v = new TextView(MainActivity.this);                    v.setPadding(60,0,0,0);                    v.setTextSize(15);                }else{                    v = (TextView) convertView;                }                v.setText(child[groupPosition][childPosition]);                return v;            }            @Override            public boolean isChildSelectable(int groupPosition, int childPosition) {                return true;            }            @Override            public boolean areAllItemsEnabled() {                return true;            }            @Override            public boolean isEmpty() {                return false;            }            @Override            public void onGroupExpanded(int groupPosition) {                //选项组展开            }            @Override            public void onGroupCollapsed(int groupPosition) {                //选项组折叠            }            @Override            public long getCombinedChildId(long groupId, long childId) {                return childId;            }            @Override            public long getCombinedGroupId(long groupId) {                return groupId;            }        };        setListAdapter(adapter);    }}
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