扩展列表能够显示一个指示在每项显示项的当前状态（状态通常是一个扩展的组，组的孩子，或倒塌，最后一个孩子）。使用setchildindicator（drawable）或setgroupindicator（drawable）（或相应的XML属性）来设置这些指标,一个默认的风格多级列表提供指标，将示给意见多级列表。布局android.r.layout.simple_expandable_list_item_1和android.r.layout.simple_expandable_list_item_2（应用simplecursortreeadapter）包含位置信息的首选指标。
效果图：
public class MainActivity extends Activity { private ExpandableListView listView; private List<String> group; private List<List<String>> child; private MyAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listView = (ExpandableListView) findViewById(R.id.expandableListView); /** * 初始化数据 */ initData(); adapter = new MyAdapter(this,group,child); listView.setAdapter(adapter); } private void initData() { group = new ArrayList<String>(); child = new ArrayList<List<String>>(); addInfo("笑傲江湖",new String[]{"东方不败","风清扬","令狐冲","岳不群"}); addInfo("天龙八部", new String[]{"乔峰","虚竹","段誉"}); addInfo("九阴真经", new String[]{"中神通","东邪","西毒","南帝","北丐"}); } /** * 添加数据信息 * @param g * @param c */ private void addInfo(String g,String[] c) { group.add(g); List<String> list = new ArrayList<String>(); for (int i = 0; i < c.length; i++) { list.add(c[i]); } child.add(list); } }
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