二级列表ExpandableListView的使用

###布局

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

###MainActivity

public class MainActivity extends Activity {
 private ExpandableListView elv;
 String [] group=new String[]{
   "港台明星", "大陆明星", "欧美明星", "日韩明星"
 };
 String[][]child=new String[][]{
   {"刘德华","小猪","周总","林志玲","老游"},{"老程","栋栋","樊姐"},{"MJ","kobe","库里"},{"权志龙","宋仲基","允儿","倍倍"}
 };
 private WXAdapter adapter;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  elv=(ExpandableListView) findViewById(R.id.elv);
  adapter=new WXAdapter(MainActivity.this,group,child);
  elv.setAdapter(adapter);
  elv.invalidateViews();
  elv.setGroupIndicator(getResources().getDrawable(R.drawable.indicator));
  elv.setOnChildClickListener(new OnChildClickListener() {
   
   @Override
   public boolean onChildClick(ExpandableListView parent, View v,
     int groupPosition, int childPosition, long id) {
    Toast.makeText(MainActivity.this, groupPosition+"二级列表监听"+childPosition, 0).show();
    return false;
   }
  });
  //一级列表关闭监听
  elv.setOnGroupCollapseListener(new OnGroupCollapseListener() {
   
   @Override
   public void onGroupCollapse(int groupPosition) {
    Toast.makeText(MainActivity.this, groupPosition+"组关闭了", 0).show();
    
    
   }
  });
  //一级列表展开监听
  elv.setOnGroupExpandListener(new OnGroupExpandListener() {
   
   @Override
   public void onGroupExpand(int groupPosition) {
    Toast.makeText(MainActivity.this, groupPosition+"组展开了", 0).show();

/**
     * 展开组时,关闭其他组
     */
    for(int i=0;i<adapter.getGroupCount();i++){
     if(i!=groupPosition){
      elv.collapseGroup(i);
     }
    }
    
   }
  });
 }
}

###适配器

public class WXAdapter extends BaseExpandableListAdapter {

 MainActivity mainActivity;
 String[]group;
 String[][]child;
 
 public WXAdapter(MainActivity mainActivity, String[] group, String[][] child) {
  this.mainActivity=mainActivity;
  this.group=group;
  this.child=child;
 }

 @Override
 public Object getChild(int groupPosition, int childPosition) {
  // TODO Auto-generated method stub
  return null;
 }

 @Override
 public long getChildId(int groupPosition, int childPosition) {
  // TODO Auto-generated method stub
  return 0;
 }

 //二级列表的视图
 @Override
 public View getChildView(int groupPosition, int childPosition,
   boolean isLastChild, View convertView, ViewGroup parent) {
  View view=View.inflate(mainActivity, android.R.layout.simple_expandable_list_item_2, null);
  TextView text2=(TextView) view.findViewById(android.R.id.text1);
  text2.setText(child[groupPosition][childPosition]);
  
  return view;
 }

 //当前一级列表下有多少个子列表
 @Override
 public int getChildrenCount(int groupPosition) {
  // TODO Auto-generated method stub
  return child[groupPosition].length;
 }

 @Override
 public Object getGroup(int groupPosition) {
  // TODO Auto-generated method stub
  return null;
 }

 //一级列表的个数
 @Override
 public int getGroupCount() {
  // TODO Auto-generated method stub
  return group.length;
 }

 @Override
 public long getGroupId(int groupPosition) {
  // TODO Auto-generated method stub
  return 0;
 }

 //一级列表的视图
 @Override
 public View getGroupView(int groupPosition, boolean isExpanded,
   View convertView, ViewGroup parent) {
  View view=View.inflate(mainActivity, android.R.layout.simple_expandable_list_item_2, null);
  TextView text1=(TextView) view.findViewById(android.R.id.text1);
  text1.setText(group[groupPosition]);
  return view;
 }

 @Override
 public boolean hasStableIds() {
  // TODO Auto-generated method stub
  return false;
 }

 @Override
 public boolean isChildSelectable(int groupPosition, int childPosition) {
  
  return true;
 }

}