ListView_SimpleAdapter

一:java代码.

MainActivity：

package com.action;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import java.util.*;
import com.util.*;
/**主界面的Activity*/
public class MainActivity extends Activity {
/** Called when the activity is first created. */
private ListView lv;
private List<Map<String, Object>> lsmap;
private int index;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

lv = (ListView) findViewById(R.id.main_lv);
// 获取保存有数据的List集合对象
lsmap = new DataUtil().findData();

// 创建简单适配器对象
/**
* 参数1：上下文关系对象 参数2: 绑定数据的List集合，此List集合的对象元素为Map集合 参数3:
* 子布局视图，子布局视图用于设置Map集合中保存的数据 参数4: Map集合中的主键名称 参数5:
* 子布局视图上的控件（如ImageView和TextView）
* */
SimpleAdapter sa = new SimpleAdapter(this, lsmap, R.layout.list_item,
new String[] { "icon", "title", "content" }, new int[] {
R.id.item_iv, R.id.item_title, R.id.item_content });

// 将适配器传递给ListView
lv.setAdapter(sa);

/** listView的选项点击事件 */
lv.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
// 获取选中的索引位置，它也是list集合的索引位置
index = arg2;

Map<String, Object> map = lsmap.get(index);
Integer id = (Integer) map.get("icon");

Intent in = new Intent();
in.setClass(MainActivity.this, ShowImageActivity.class);
in.putExtra("icon", "" + id);

MainActivity.this.startActivity(in);
}
});

/** ListView的长按事件 */
lv.setOnItemLongClickListener(new OnItemLongClickListener() {

@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
String[] op = { "修改信息", "删除信息" };
AlertDialog.Builder ab = new Builder(MainActivity.this);
ab.create();

ab.setTitle("选择操作");
ab.setItems(op, new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
switch (which) {
case 0:
System.out.println("进行修改");
break;
case 1:
System.out.println("进行删除");
break;

default:
break;
}
}
});
ab.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub

}
});

ab.show();
return false;
}
});

}
}

ShowImageActivity:
package com.action;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
/**显示图片的Activity*/
public class ShowImageActivity extends Activity {
private ImageView iv;
private Button btback;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.showimage_layout);

//获取意图
Intent in=getIntent();

//获取资源对象
String id=in.getStringExtra("icon");

int rid=Integer.parseInt(id);
iv=(ImageView) findViewById(R.id.showimage_iv);
iv.setImageResource(rid);

btback=(Button) findViewById(R.id.showimage_btback);
btback.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent inr=new Intent();
inr.setClass(ShowImageActivity.this,MainActivity.class);
startActivity(inr);
finish();
}
});

}
}


DataUtil:

package com.util;
import java.util.*;

import com.action.*;
/**提供数据源*/
public class DataUtil {
private List<Map<String,Object>> lsmap=new ArrayList<Map<String,Object>>();
public List<Map<String,Object>> findData(){
Map<String,Object> map1=new HashMap<String, Object>();
map1.put("icon",R.drawable.ascent);
map1.put("title","月亮");
map1.put("content","静夜思，李白，晚唐作品");
lsmap.add(map1);

Map<String,Object> map2=new HashMap<String, Object>();
map2.put("icon",R.drawable.home);
map2.put("title","归家");
map2.put("content","家庭，陆游，南宋作品");
lsmap.add(map2);

Map<String,Object> map3=new HashMap<String, Object>();
map3.put("icon",R.drawable.autumn);
map3.put("title","秋叶");
map3.put("content","渔舟晚照，王维，晚唐作品");
lsmap.add(map3);

Map<String,Object> map4=new HashMap<String, Object>();
map4.put("icon",R.drawable.azul);
map4.put("title","海子");
map4.put("content","孤舟晚归，苏轼，北宋作品");
lsmap.add(map4);

Map<String,Object> map5=new HashMap<String, Object>();
map5.put("icon",R.drawable.bliss);
map5.put("title","草原");
map5.put("content","敕勒川，岑蔘，南宋作品");
lsmap.add(map5);

return lsmap;
}

}


二:布局文件.

主布局文件:main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ListView
android:id="@+id/main_lv"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>

</LinearLayout>

ListView的子布局视图:list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<ImageView
android:id="@+id/item_iv"
android:layout_width="80dp"
android:layout_height="90dp"
android:contentDescription="@string/desc"
android:src="@drawable/ic_launcher" />

<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:orientation="vertical" >

<TextView
android:id="@+id/item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium" />

<TextView
android:id="@+id/item_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
</LinearLayout>

</LinearLayout>

用于显示图片的布局:showimage_layout.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" >

<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >

<ImageView
android:id="@+id/showimage_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/desc"
android:src="@drawable/ascent" />
</LinearLayout>

<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical" >

<Button
android:id="@+id/showimage_btback"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btback" />
</LinearLayout>

</LinearLayout>

效果如下图所示:



点击item,显示这张图片;长按图片弹出一个对话框.