自定义Adapter与系统自带的adapter区别(样例步骤).txt

概述item.list.xml(自定义item布局样式)<?xmlversion="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apkes/android"xmlns:tools="http://schemas.android.comools"android:id=&

item.List.xml(自定义item布局样式)

<?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_item_List"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:gravity="center_vertical"    androID:orIEntation="horizontal"    androID:padding="15dp"    tools:context="com.example.jump.ItemListActivity">    <ImageVIEw        androID:ID="@+ID/iv_img"        androID:layout_wIDth="50dp"        androID:layout_height="50dp"        androID:src="@drawable/changan"        androID:scaleType="centerCrop"/>    <TextVIEw        androID:ID="@+ID/name"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:text="长安"        androID:layout_marginleft="15dp"        androID:textSize="30sp"/></linearLayout>

新建实体类entity，描述自定义item布局中的属性，调用get和set方法

package com.example.entity;/** * Created by administrator on 2017/2/16. */public class CarCompany {    private String company;    private int img;    public String getCompany() {        return company;    }    public int getimg() {        return img;    }    public voID setimg(int img) {        this.img = img;    }    public voID setCompany(String company) {        this.company = company;    }}

在activity中实例化ListvIEw控件，创建数据源（构建演示数据 List<？>）

package com.example.jump;import androID.support.v7.app.AppCompatActivity;import androID.os.Bundle;import androID.Widget.ArrayAdapter;import androID.Widget.ListVIEw;import com.example.adapter.MyAdapter;import com.example.entity.CarCompany;import java.util.ArrayList;import java.util.List;public class ArrayAdapteractivity extends AppCompatActivity {    private ListVIEw lv;    private List<String> str_List;    private String[] names=new String[]{"长安", "沃尔沃", "大众", "宾利", "奔驰"};    private int[] IDs=new int[]{R.drawable.changan,R.drawable.vol,R.drawable.das,R.drawable.bl,R.drawable.benz};    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_array_adapter);        lv= (ListVIEw) findVIEwByID(R.ID.lv_List);//        intiArrayList();        intiCustomAdapter();    }    private voID intiArrayList(){        //数据构建完成        str_List=new ArrayList<String>();        str_List.add("AndroID");        str_List.add("IOS");        str_List.add("windowsPhone");        //Adapter        ArrayAdapter adapter=new ArrayAdapter(this,androID.R.layout.simple_List_item_1,str_List);        //将适配器设置给ListvIEw        lv.setAdapter(adapter);    }    //新建List存放carcompany数据    private voID intiCustomAdapter(){        List<CarCompany> List=new ArrayList<CarCompany>();        for (int i = 0; i < names.length; i++) {            CarCompany company=new CarCompany();            company.setimg(IDs[i]);            company.setCompany(names[i]);            List.add(company);        }        MyAdapter myadapter=new MyAdapter(List,this);        lv.setAdapter(myadapter);    }}

新建Adapter（自定义）

package com.example.adapter;import androID.content.Context;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.BaseAdapter;import androID.Widget.ImageVIEw;import androID.Widget.TextVIEw;import com.example.entity.CarCompany;import com.example.jump.R;import java.util.List;/** * Created by administrator on 2017/2/16. */public class MyAdapter extends BaseAdapter {    private List<CarCompany> List;//数据源    private Context context;//上下文对象    private LayoutInflater inflater;//布局加载器    //有参的构造函数，为数据源，上下文对象复制，同时实例化布局加载器    public MyAdapter(List<CarCompany> List,Context context) {        this.List=List;        this.context=context;        inflater=LayoutInflater.from(context);    }    //有多少条数据，需要创建多少个item布局    @OverrIDe    public int getCount() {        return List.size();    }    //返回position对应位置的数据    @OverrIDe    public Object getItem(int position) {        return List.get(position);    }    //返回position对应位置item的ID    @OverrIDe    public long getItemID(int position) {        return position;    }    /**     * 具体定义加载item布局，并将数据显示到item布局上的方法。     * @param position     * @param convertVIEw     * @param parent     * @return     */    @OverrIDe    public VIEw getVIEw(int position, VIEw convertVIEw, VIEwGroup parent) {        //加载item布局 将xml布局加载到内存中，形成一个vIEw        VIEw vIEw=inflater.inflate(R.layout.activity_item_List,null);        //实例化item布局上的控件        ImageVIEw iv= (ImageVIEw) vIEw.findVIEwByID(R.ID.iv_img);        TextVIEw tv= (TextVIEw) vIEw.findVIEwByID(R.ID.name);        //往控件上显示数据        //获取position对应位置的数据        CarCompany company= (CarCompany) getItem(position);        iv.setimageResource(company.getimg());        tv.setText(company.getCompany());        return vIEw;    }}

在activity中实例化adapter,设置给ListvIEw

/新建List存放carcompany数据    private voID intiCustomAdapter(){        List<CarCompany> List=new ArrayList<CarCompany>();        for (int i = 0; i < names.length; i++) {            CarCompany company=new CarCompany();            company.setimg(IDs[i]);            company.setCompany(names[i]);            List.add(company);        }        MyAdapter myadapter=new MyAdapter(List,this);        lv.setAdapter(myadapter);    }

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