怎么在Android中实现一个ListView点击展开收起效果

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context=".MainActivity" >
  <!--提示框-->
  <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="请选择您的类型："
    android:textSize="30sp"
    android:textColor="#ffffffff"
    android:paddingLeft="5dp"
    android:paddingTop="5dp"
    android:paddingBottom="5dp"
    android:background="#ff000000"/>
  <!--定义一个ExpandableListView组件-->
  <ExpandableListView
    android:id="@+id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
  </ExpandableListView>
</LinearLayout>

public class MainActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //创建一个ExpandableListAdapter对象
    final ExpandableListAdapter adapter = new ExpandableListAdapter() {
      int[] logos = new int[]{
          R.drawable.human1st,
          R.drawable.human1st,
          R.drawable.human2nd,
          R.drawable.human3rd
      };
      private String[] humanTypes = new String[]{
          "不是人","聪明人","普通人","我这样的人"
      };
      private String[][] humans = new String[][]{
          {"上仙","大神","荷兰猪"},
          {"超人","一般聪明人","假的聪明人"},
          {"努力的人","快乐的普通人","苦逼的普通人"},
          {"天才","傻逼","蠢萌"}
      };
      //获得制定组的位置、指定子列表项处的字列表项数据
      private TextView getTextView(){
        AbsListView.LayoutParams layoutParams =
            new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,164);
        TextView textView = new TextView(MainActivity.this);
        textView.setLayoutParams(layoutParams);
        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        textView.setPadding(36,0,0,0);
        textView.setTextSize(30);
        return textView;
      }
      @Override
      public void registerDataSetObserver(DataSetObserver observer) {
      }
      @Override
      public void unregisterDataSetObserver(DataSetObserver observer) {
      }
      @Override
      public int getGroupCount() {
        return humanTypes.length;
      }
      @Override
      public int getChildrenCount(int groupPosition) {
        return humans[groupPosition].length;
      }
      //获取制定组位置处的组数据
      @Override
      public Object getGroup(int groupPosition) {
        return humanTypes[groupPosition];
      }
      @Override
      public Object getChild(int groupPosition, int childPosition) {
        return humans[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;
      }
      //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 linearLayout = new LinearLayout(MainActivity.this);
        linearLayout.setOrientation(LinearLayout.HORIZONTAL);
        ImageView logo = new ImageView(MainActivity.this);
        logo.setImageResource(logos[groupPosition]);
        linearLayout.addView(logo);
        TextView textView = getTextView();
        textView.setText(getGroup(groupPosition).toString());
        linearLayout.addView(textView);
//        linearLayout.setMinimumHeight(50);
        return linearLayout;
      }
      @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 0;
      }
      @Override
      public long getCombinedGroupId(long groupId) {
        return 0;
      }
    };
    ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);
    expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
      @Override
      public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
        Toast.makeText(MainActivity.this,"你是一个：" +
            adapter.getChild(groupPosition,childPosition),Toast.LENGTH_SHORT).show();
        return true;
      }
    });
    expandableListView.setAdapter(adapter);
  }
}