android之SimpleAdapter创建和动态添加.删除SimpleAdapter选中项

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package com.ghg.SimpleAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class Day0604_SimpleAdapterActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initView();
}
//构造数据源，一个存放map集合的ArrayList
ArrayList<HashMap<String, Object>> list;
private ArrayList<HashMap<String, Object>> getList(){
list=new ArrayList<HashMap<String,Object>>();
for(int i=1;i<=20;i++){
HashMap<String, Object> map=new HashMap<String, Object>();
//姓名，身高（cm），体重（斤），价格（万）
map.put("name", "jiajia"+i);
map.put("height", 160+new Random().nextInt(10));
map.put("weight", 100+new Random().nextInt(10));
map.put("price", 100+new Random().nextInt(200));
list.add(map);
}
return list;
}
ListView listView;
private void initView() {
// TODO Auto-generated method stub
listView=(ListView) findViewById(R.id.listView);
String[] from={"name","height","weight","price"};
int[] to={R.id.tv_01,R.id.tv_02,R.id.tv_03,R.id.tv_04};
SimpleAdapter adapter=new SimpleAdapter(this, getList(), R.layout.item, from, to);
listView.setAdapter(adapter);
}
}

Android中动态添加和删除SimpleAdapter中项
首先是创建三个全局变量：

SimpleAdapter listItemAdapter; // ListView的适配器
ArrayList<HashMap<String, Object>> listItem; // ListView的数据源，这里是一个HashMap的列表
ListView myList; // ListView控件

然后在Activity的onCreate函数中对变量进行初始化：
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listItem = new ArrayList<HashMap<String, Object>>();

listItemAdapter = new SimpleAdapter(this, listItem, R.layout.mylayout,

new String[]{"image", "title", "text"},

new int[]{R.id.ItemImage, R.id.ItemTitle, R.id.ItemText});

myList = (ListView)findViewById(R.id.TaxiList);

myList.setAdapter(listItemAdapter);
```
listItem = new ArrayList<HashMap<String, Object>>();
listItemAdapter = new SimpleAdapter(this, listItem, R.layout.mylayout, 
new String[]{"image", "title", "text"},
new int[]{R.id.ItemImage, R.id.ItemTitle, R.id.ItemText});
myList = (ListView)findViewById(R.id.TaxiList);
myList.setAdapter(listItemAdapter);
```
添加两个私有的功能函数：
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private void addItem()

{

HashMap<String, Object> map = new HashMap<String, Object>();

map.put("image", R.drawable.icon);

map.put("title", "标题");

map.put("text", "要显示的内容");

listItem.add(map);

listItemAdapter.notifyDataSetChanged();

}

private void deleteItem()

{

int size = listItem.size();

if( size > 0 )

{

listItem.remove(listItem.size() - 1);

listItemAdapter.notifyDataSetChanged();

}

}
```
private void addItem()
{
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("image", R.drawable.icon);
map.put("title", "标题");
map.put("text", "要显示的内容");
listItem.add(map);
listItemAdapter.notifyDataSetChanged();
}

private void deleteItem()
{
int size = listItem.size();
if( size > 0 )
{
listItem.remove(listItem.size() - 1);
listItemAdapter.notifyDataSetChanged();
}
}
```
另附上ListView的项自定义的Layout不再多说:
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<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout

android:id="@+id/RelativeLayout01"

android:layout_width="fill_parent"

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_height="wrap_content"

android:paddingBottom="4dip"

android:paddingLeft="12dip"

android:paddingRight="12dip">

<ImageView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/taxi1"

android:id="@+id/ItemImage"

android:paddingTop="4dip">

</ImageView>

<TextView

android:layout_height="wrap_content"

android:layout_width="fill_parent"

android:text="DaZhong Taxi Corporation"

android:layout_toRightOf="@+id/ItemImage"

android:id="@+id/ItemTitle"

android:textSize="24dip"></TextView>

<TextView

android:layout_height="wrap_content"

android:layout_width="fill_parent"

android:text="Tel:021-67786874"

android:id="@+id/ItemText"

android:layout_below="@+id/ItemTitle"

android:layout_toRightOf="@+id/ItemImage">

</TextView>

</RelativeLayout>
```
<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout   
android:id="@+id/RelativeLayout01"   
android:layout_width="fill_parent"   
xmlns:android="http://schemas.android.com/apk/res/android"   
android:layout_height="wrap_content"   
android:paddingBottom="4dip"   
android:paddingLeft="12dip"  
android:paddingRight="12dip">  
<ImageView 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:src="@drawable/taxi1" 
android:id="@+id/ItemImage" 
android:paddingTop="4dip">
</ImageView>
<TextView 
android:layout_height="wrap_content" 
android:layout_width="fill_parent" 
android:text="DaZhong Taxi Corporation" 
android:layout_toRightOf="@+id/ItemImage" 
android:id="@+id/ItemTitle" 
android:textSize="24dip"></TextView>
<TextView 
android:layout_height="wrap_content" 
android:layout_width="fill_parent" 
android:text="Tel:021-67786874" 
android:id="@+id/ItemText" 
android:layout_below="@+id/ItemTitle" 
android:layout_toRightOf="@+id/ItemImage">
</TextView>
</RelativeLayout> 
```
注：使用ArrayAdapter在动态更改内容时，不需要其他更改，但要使之生效，必须放在函数
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1. runOnUiThread(new Runnable(){
2. public void run(){
3. //此处为你要对ArrayAdapter内容更改所需要做的操作
4. }
5. });
```
runOnUiThread(new Runnable(){
    public void run(){
    //此处为你要对ArrayAdapter内容更改所需要做的操作
    }
});
```
中进行操作才能生效。

但使用SimpleAdapter进行更改之后，必须使用.notifyDataSetChanged();方法进行通知该SimpleAdapter内容已经发生改变。

Android中动态添加和删除SimpleAdapter中项