ListView的适配（使用自定义ArrayAdapter）

本文转自：http://blog.****.net/liuyucui100/article/details/50788598

ListView在平时开发中使用的最广泛，应用也是最多的，而使用系统的适配器并不能满足我们多样化的要求，因此本文就自定义适配器展开，下面直接附上我已经测试通过的代码： 

MyAdaActivity .Java:

package com.example.tiamaes.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MyAdaActivity extends AppCompatActivity {

    private ListView listview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_ada);

        listview = (ListView) findViewById(R.id.listview);
        MyAdapter adapter = new MyAdapter(MyAdaActivity.this, 0, getData());
        listview.setAdapter(adapter);
    }

    private List<Person> getData() {
        // TODO Auto-generated method stub
        List<Person> list= new ArrayList<Person>();
        for(int i=0;i<20;i++)
        {
            Person p = new Person(R.mipmap.ic_launcher,i+"","我是第"+i+"项");
            list.add(p);
        }
        return list;
    }
}

自定义数据类型：Person.java

package com.example.tiamaes.myapplication;

/**
 * Created by Tiamaes on 2017/8/17.
 */
public class Person {
    private int mPicture;
    private String mTitle;
    private String mContent;
    public  Person(int picture,String title,String content){
        this.mPicture = picture;
        this.mTitle = title;
        this.mContent = content;
    }
    public int getPicture() {
        return mPicture;
    }
    public void setmPicture(int mPicture) {
        this.mPicture = mPicture;
    }
    public String getTitle() {
        return mTitle;
    }
    public void setTitle(String mTitle) {
        this.mTitle = mTitle;
    }
    public String getContent() {
        return mContent;
    }
    public void setContent(String mContent) {
        this.mContent = mContent;
    }

}

自定义适配器：MyAdapter.java

package com.example.tiamaes.myapplication;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

/**
 * Created by Tiamaes on 2017/8/17.
 */
public class MyAdapter extends ArrayAdapter<Person> {

    private int resourceId;
    private List<Person> objects;
    private Context context;
    public MyAdapter(Context context, int resourceId, List<Person> objects)
    {
        super(context, resourceId, objects);
        this.resourceId=resourceId;
        this.objects=objects;
        this.context=context;
    }
    private static class ViewHolder
    {
        ImageView imageView;
        TextView title;
        TextView content;
    }

    public int getCount()
    {
        return objects.size();
    }
    public Person getItem(int position)
    {
        return objects.get(position);
    }

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

	//convertView相当于listView中的某一行控件，将该行信息填写完成后，再返回给ListView

        ViewHolder viewHolder = null;
        if(convertView==null)
        {
            viewHolder=new ViewHolder();
            LayoutInflater mInflater=LayoutInflater.from(context);
            convertView=mInflater.inflate(R.layout.item, null);//从item资源文件处加载控件布局。
            viewHolder.imageView=(ImageView) convertView.findViewById(R.id.imageview);
            viewHolder.title=(TextView)convertView.findViewById(R.id.title);
            viewHolder.content=(TextView)convertView.findViewById(R.id.content);
            convertView.setTag(viewHolder);
        }else
        {
            viewHolder=(ViewHolder)convertView.getTag();
        }
        Person person=objects.get(position);
        if(person!=null)
        {
            viewHolder.imageView.setBackgroundResource(person.getPicture());
            viewHolder.title.setText(person.getTitle());
            viewHolder.content.setText(person.getContent());
        }
        return convertView;
    }

}

主布局文件：main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.tiamaes.myapplication.MyAdaActivity">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listview"
        android:layout_margin="2dp"
        >
    </ListView>


</RelativeLayout>

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"
    android:orientation="horizontal"
    >
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/ic_launcher"
        android:id="@+id/imageview"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="title"
            android:id="@+id/title"
            />
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/content"
            android:text="content"
            />

    </LinearLayout>
</LinearLayout>