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：