ExpandableListView（listView嵌套）

可以做出一个类似QQ分组的界面（点开分组，里面有人）

在mainactivity中连接到界面，findById找到ExpandableListView，初始化数据，这个初始化是两个List的嵌套，把Student数据放到List<Student> students中，把Clazz数据放在List<Clazz> mClazz中，然后把students套进mClazz中（每个班级都有好多学生，每个mClazz中都有一个students的列表），嵌套是把生成的Clazz的对象（里面包含了student的List、班级名称、编号）放在了List中，然后把这个嵌套的List和初始化的Layoutinflater传给adapter，需要在layout中创建两个规则界面来分别配置GroupView和ChildView，把得来的数据解析，GroupView得到本行List（对应班级对象）,里面包含班级名、编号和一个完整List,ChildView也解析这个数据把那个完整的List再解析得到每个学生的信息，然后各自添加到各自的Layout界面

Student类里面是name、age、sex的set get方法

Clazz类里面是clazznum、clazzname、List<Clazz>的setget方法

mainactivity

public class MainActivity extends Activity {private List<Clazz> mClazzs;private ExpandableListView mExpandListview;private ExpandableAdapter mAdapter;private LayoutInflater inflater;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);mExpandListview = (ExpandableListView) findViewById(R.id.expandableListview);        gettData();inflater=getLayoutInflater();mAdapter=new ExpandableAdapter(mClazzs,inflater);mExpandListview.setAdapter(mAdapter);    }
private void gettData() {mClazzs = new ArrayList<>();    List<Student> students = new ArrayList<>();    students.add(new Student("张三", "男", "18"));添加student的List    students.add(new Student("李四", "男", "19"));    students.add(new Student("王五", "男", "21"));    students.add(new Student("赵六", "男", "23"));    students.add(new Student("马奇", "男", "20"));

mClazzs.add(new Clazz("一班", students, "201501"));添加班级的List并把students这个List嵌套，构造器可以把students这个List传给ClazzmClazzs.add(new Clazz("二班", students,"201502"));mClazzs.add(new Clazz("三班", students,"201503"));mClazzs.add(new Clazz("四班", students,"201504"));}
Expandableadapter继承自BaseExpandableListAdapter
getGroupCount
getChildrenCount
getGroupView
getChildView
这四个复写的方法需要重写，其他的都是返回position
@Overridepublic int getGroupCount() {return mClazz.size();}

@Overridepublic int getChildrenCount(int groupPosition) {return mClazz.get(groupPosition).getStudents().size();    找到Clzz找到学生的ListView得到长度}

@Overridepublic View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {    convertView=mInflater.inflate(R.layout.item_clazz,null);    TextView clazzName= (TextView) convertView.findViewById(R.id.textview_clazz_name);    TextView clazzNum= (TextView) convertView.findViewById(R.id.textview_clazz_num);    TextView clazzStuNum= (TextView) convertView.findViewById(R.id.textview_clazz_renshu);    Clazz clazz=mClazz.get(groupPosition);    clazzName.setText(clazz.getClazzName());    clazzNum.setText(clazz.getClazzNum());    clazzStuNum.setText(""+clazz.getStudents().size());//输出这种长度太小（不是本身带有的），计算机找不到，转化成String类型
return convertView;}

@Overridepublic View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {   convertView=mInflater.inflate(R.layout.item_student,null);    TextView studentName= (TextView) convertView.findViewById(R.id.textview_student_name);    TextView studentSex= (TextView) convertView.findViewById(R.id.textview_student_sex);    TextView studentAge= (TextView) convertView.findViewById(R.id.textview_student_age);   Clazz clazz=mClazz.get(groupPosition);得到对应的班级    List<Student> studentslist=clazz.getStudents();得到这个班级类中包含的student  List    Student student=studentslist.get(childPosition);从List对应行得到学生对象    studentName.setText(student.getName());    studentAge.setText(student.getAge());    studentSex.setText(student.getSex());return convertView;}

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