Android-ListView 点击展开与收起效果实现

<?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);
    }
}