Android ListView和Adapter数据适配器的简单介绍

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <ImageView
    android:id="@+id/image_photo"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:padding="10dp"/>
  <TextView
    android:id="@+id/name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="20dp"
    android:layout_toRightOf="@id/image_photo"/>
  <TextView
    android:id="@+id/age"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="20dp"
    android:layout_toRightOf="@id/image_photo"
    android:layout_below="@id/name"
    android:layout_marginTop="10dp"/>
</RelativeLayout>

public class Student {
  private String name;
  private int age;
  private int photo;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public int getAge() {
    return age;
  }

  public void setAge(int age) {
    this.age = age;
  }

  public int getPhoto() {
    return photo;
  }

  public void setPhoto(int photo) {
    this.photo = photo;
  }
}

public class MainActivity extends AppCompatActivity {

  private ListView listView;
　　//自定义BaseAdapter
  private MyAdapter adapter;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listView= (ListView) findViewById(R.id.listview);
    List<Student> stuList=new ArrayList<>();
    for(int i=0;i<10;i++){
      Student stu=new Student();
      stu.setAge(10+i);
      stu.setName("name"+i);
      stu.setPhoto(R.mipmap.ic_launcher);
      stuList.add(stu);
    }
　　　　　　
    adapter=new MyAdapter(stuList,MainActivity.this);
    listView.setAdapter(adapter);
  }

public class MyAdapter extends BaseAdapter {

  private List<Student> stuList;
  private LayoutInflater inflater;
  public MyAdapter() {}

  public MyAdapter(List<Student> stuList,Context context) {
    this.stuList = stuList;
    this.inflater=LayoutInflater.from(context);
  }

  @Override
  public int getCount() {
    return stuList==null?0:stuList.size();
  }

  @Override
  public Student getItem(int position) {
    return stuList.get(position);
  }

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

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    //加载布局为一个视图
    View view=inflater.inflate(R.layout.layout_student_item,null);
    Student student=getItem(position);
    //在view视图中查找id为image_photo的控件
    ImageView image_photo= (ImageView) view.findViewById(R.id.image_photo);
    TextView tv_name= (TextView) view.findViewById(R.id.name);
    TextView tv_age= (TextView) view.findViewById(R.id.age);
    image_photo.setImageResource(student.getPhoto());
    tv_name.setText(student.getName());
    tv_age.setText(String.valueOf(student.getAge()));
    return view;
  }