ExpandableListView（listView嵌套）

public class MainActivity extends Activity {
private List<Clazz> mClazzs;
private ExpandableListView mExpandListview;
private ExpandableAdapter mAdapter;
private LayoutInflater inflater;
@Override
protected 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Clazz
mClazzs.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
@Override
public int getGroupCount() {
return mClazz.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return mClazz.get(groupPosition).getStudents().size();    找到Clzz找到学生的ListView得到长度
}
@Override
public 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;
}

@Override
public 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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