android适配器+listview

Posted 2021-01-11 goodshred

简单 继承BaseAdapter：

 

 

Myadapter代码：

public class Myadapter extends BaseAdapter {
    private Context context;

    private List<User>list;
    public Myadapter(Context context, List<User>list){
        super();
        this.context=context;
        this.list=list;
    }
    @Override
    //得到个数
    public int getCount() {
        return list.size();
    }

    @Override
    //得到所以索引，即i值
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

     User user=list.get(position);
        LayoutInflater layoutInflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     ViewGroup viewGroup=(ViewGroup) layoutInflater.inflate(R.layout.user_item,null);
     TextView textView1= (TextView)viewGroup.findViewById(R.id.textview1);
     textView1.setText(user.getName());
        TextView textView2= (TextView)viewGroup.findViewById(R.id.textview2);
        textView2.setText(user.getPhone());
        TextView textView3= (TextView)viewGroup.findViewById(R.id.textview3);
       // textView3.setText(user.getAge());
        textView3.setText(String.valueOf(user.getAge()));
       return viewGroup;
    }
}

MianActivity：

public class MainActivity extends AppCompatActivity {
    private List<User> list =new ArrayList<User>();
  /*  private String[] ss=new String[]{
            "山西","太原","山东","贵阳","天津","北京","洪湖"
    };*/
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView = (ListView) findViewById(R.id.list_view);
        for(int i=0;i<10;i++){
            User user=new User("gao"+i,"2333"+i,i);
            list.add(user);
        }
        Myadapter adapter=new Myadapter(this,list);
        listView.setAdapter(adapter);
    }


}

user类：

public class User {
    private String name;
    private String phone;
    private Integer age;
    
    public User(String name, String phone, Integer age) {
        this.name = name;
        this.phone = phone;
        this.age = age;
    }
    public String getName() {
        return name;
    }

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

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public Integer getAge() {
        return age;
    }

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

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
  >
    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/list_view"
        >
    </ListView>
</LinearLayout>

user_item.xml:

<?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">
<TextView
    android:id="@+id/textview1"
    android:layout_width="wrap_content"
    android:layout_weight="1"
    android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textview2"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textview3"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content" />
</LinearLayout>