安卓——ArrayAdapter和SimpleAdapter实现ListView

ArrayAdapter实现ListView

main.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="vertical" >

<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>

</LinearLayout>

MainActivityActivity.java

package com.example.android_listvieww;

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

public class MainActivityActivity extends Activity {

private ListView listView;
private ArrayAdapter<String>arr_adapter;
private SimpleAdapter simp_adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

listView=(ListView) findViewById(R.id.listView);
//1.新建一个数据适配器
//ArrayAdapter（上下文，当前listView加载的每一个列表项所对应的布局文件，数据源）
//2.适配器加载数据源
String[]arr_data={"苹果","香蕉","橙子","猕猴桃"};
arr_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arr_data);
//3.视图加载适配器
listView.setAdapter(arr_adapter);
}
}

SimpleAdapter实现ListView

main.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="vertical" >

<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>

</LinearLayout>

MainActivityActivity.java

package com.example.android_listvieww;

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

import android.R.integer;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class MainActivityActivity extends Activity {

private ListView listView;
private ArrayAdapter<String>arr_adapter;
private SimpleAdapter simp_adapter;
private List<Map<String, Object>>dataList;//SimpleAdapter的data
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

listView=(ListView) findViewById(R.id.listView);
//1.新建一个数据适配器
//ArrayAdapter（上下文，当前listView加载的每一个列表项所对应的布局文件，数据源）
//2.适配器加载数据源
String[]arr_data={"苹果","香蕉","橙子","猕猴桃"};
arr_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arr_data);
/*SimpleAdapter——
* 1.context：上下文
* 5.data：数据源List<? extends Map<String,?>> data 一个Map所组成的List集合，
* 每一个Map都会去对应ListView列表中的一行，
* 每一个Map（键-值对）中的键必须包含所在from中所指定的键
* 2.resource：列表项的布局文件ID
* 4.from：Map中的键名
* 3.to：绑定数据视图中的ID，与from对应关系
* */
dataList=new ArrayList<Map<String,Object>>();
simp_adapter=new SimpleAdapter(this, getData(), R.layout.item, new String[]{"pic","text"}, new int[]{R.id.pic,R.id.text});
//3.视图加载适配器
listView.setAdapter(arr_adapter);
listView.setAdapter(simp_adapter);
}
private List<Map<String, Object>> getData() {
for(int i=0;i<20;i++){
Map<String, Object>map=new HashMap<String, Object>();
map.put("pic", R.drawable.ic_launcher);
map.put("text", "苹果"+i);
dataList.add(map);
}
return dataList;
}
}