Android进阶笔记10：ListView篇之ListView显示多种类型的条目（item）

ListView可以显示多种类型的条目布局，这里写显示两种布局的情况，其他类似.

1. 这是MainActivity，MainActivity的布局就是一个ListView，太简单了这里就不写了，直接来到MainActivity，如下：

 public class MainActivity extends Activity {

     private ListView lv;
     private List<People> lists;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         lv = (ListView) findViewById(R.id.lv);

         lists=new ArrayList<>();
         //0代表学生，1代表老师
         People people1 = new People(0, "10");//类型，钱
         People people2 = new People(1, "100");
         People people3 = new People(1, "100");
         People people4 = new People(0, "10");
         lists.add(people1);
         lists.add(people2);
         lists.add(people3);
         lists.add(people4);

         lv.setAdapter(new MyAdapter());
     }

     class MyAdapter extends BaseAdapter{

         @Override
         public int getCount() {
             return lists.size();
         }

         @Override
         public Object getItem(int i) {
             return lists.get(i );
         }

         @Override
         public long getItemId(int i) {
             return i;
         }

         @Override
         public int getItemViewType(int position) {
             if(lists.get(position).getType()==0){//当前JavaBean对象的类型
                 return 0;//学生类型
             }else if(lists.get(position).getType()==1){
                 return 1;//老师类型
             }else {
                 return 100;
             }

         }

         @Override
         public int getViewTypeCount() {
             return 2;//总共有两个类型
         }

         @Override
         public View getView(int position, View convertView, ViewGroup viewGroup) {
             int currentType = getItemViewType(position);//当前类型
             if(currentType==0){//学生类型
                 StudentViewHolder studentViewHolder;
                 if(convertView==null){
                     studentViewHolder=new StudentViewHolder();
                     convertView=View.inflate(MainActivity.this,R.layout.item_lv_student,null);
                     studentViewHolder.tv0= (TextView) convertView.findViewById(R.id.num_money_stu);
                     convertView.setTag(studentViewHolder);
                 }else{
                     studentViewHolder= (StudentViewHolder) convertView.getTag();
                 }
                 //数据填充
                 studentViewHolder.tv0.setText(lists.get(position).getMoney());
             }else if(currentType==1){//老师类型
                 TeacherViewHolder teacherViewHolder;
                 if(convertView==null){
                     teacherViewHolder=new TeacherViewHolder();
                     convertView=View.inflate(MainActivity.this,R.layout.item_lv_teacher,null);
                     teacherViewHolder.tv1= (TextView) convertView.findViewById(R.id.num_money_teacher);
                     convertView.setTag(teacherViewHolder);
                 }else{
                     teacherViewHolder= (TeacherViewHolder) convertView.getTag();
                 }
                 //数据填充
                 teacherViewHolder.tv1.setText(lists.get(position).getMoney());
             }

             return convertView;

         }
     }
     /**学生item的Holder*/
     class StudentViewHolder {
         TextView tv0;
     }
     /**老师item的Holder*/
     class TeacherViewHolder {
         TextView tv1;
     }
 }

2. 上面使用到的bean类如下：

 /**
  * 区分 学生 和 老师
  * type = 1   老师
  * type = 0   学生
  */
 public class People {
     /**类型，0表示学生，1表示老师**/
     public int type;
     public String money;

     public People(int type, String money) {
         this.type = type;
         this.money = money;
     }

     public int getType() {
         return type;
     }

     public void setType(int type) {
         this.type = type;
     }

     public String getMoney() {
         return money;
     }

     public void setMoney(String money) {
         this.money = money;
     }
 }

3. ListView的Item的布局如下：

（1）学生Item布局，如下：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="horizontal"
     android:background="#00ff00"
     >

         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="学生的钱:" />

         <TextView
             android:id="@+id/num_money_stu"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="10" />

         <Button
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="学生布局"
             android:id="@+id/button" />

 </LinearLayout>

（2）老师item的布局，如下：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="horizontal"
     android:background="#f9a5b2">

         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="老师的钱:"/>
         <TextView
             android:id="@+id/num_money_teacher"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="100"/>
 </LinearLayout>

4. 结果图：