适配器Adapter

ArrayAdapter　　只能为纯文字
SimpleAdapter   只能接受list类型的数据，并且数据只能为Map类型，可为图文
BaseAdapter　　抽象类  需要用子类继承
　　子类重写BaseAdapter的方法
　　　　构造函数(Context context; List<T> list)
　　　　int getCount()　　总数据量
　　　　Object geItem(int position)　　根据position得到某一行
　　　　long getItemId()　　获得某一行的id
　　　　View getView(int position,View convertView,ViewGroup parent){}


package com.example.administrator.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by Administrator on 2016-8-26.
 */
public class NewListActivity extends Activity {
    /*重写父类OnCreat方法  ALT+Insert*/
    ListView listView;
    List<Map<String,Object>> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.newlistviewlayout);/*设置关联视图  连接起来*/

      /*  listView = (ListView) findViewById(R.id.myList);
        *//*适配器  泛型<String> 1类型：NewListActivity.this   2数据 样式   3放的数据*//*
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
                NewListActivity.this,
                android.R.layout.simple_list_item_1,
                new String[]{"雷喜逢","卓翔","陈传印"});
        listView.setAdapter(arrayAdapter);*/
        listView = (ListView) findViewById(R.id.myList);
        list = new ArrayList<Map<String, Object>>();
        Map<String,Object> new1 = new HashMap<String, Object>();
        Map<String,Object> new2 = new HashMap<String, Object>();
        Map<String,Object> new3 = new HashMap<String, Object>();
        new1.put("title","陈传印出任国家主席！");
        new1.put("content","毛主席睁眼啦！");
        new1.put("img",R.drawable.asd);
        new2.put("title","我的祖国！");
        new2.put("content","毛主席日本一日游！");
        new2.put("img",R.drawable.asd);
        new3.put("title","我玩游戏啦！");
        new3.put("content","开学啦！");
        new3.put("img",R.drawable.asd);
        list.add(new1);
        list.add(new2);
        list.add(new3);
        SimpleAdapter simpleAdapter = new SimpleAdapter(
                NewListActivity.this,       /*1类型：NewListActivity.this*/
                list,                       /*2 数据 list*/
                R.layout.newlistitem,       /*3 样式 */
                new String[]{"title","content","img"},    /*4从哪开始from*/
                new int[]{R.id.title, R.id.content, R.id.img}); /*5 到哪结束to*/
        listView.setAdapter(simpleAdapter);
    }
}

<?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="60dp"
        android:layout_height="60dp"
        android:id="@+id/img"/>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#f00"
            android:textSize="20sp"/>
        <TextView
            android:id="@+id/content"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18sp"/>
    </LinearLayout>

</LinearLayout>

<?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">
    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/myList">

    </ListView>
</LinearLayout>