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查了很多文档终于搞明白了，SimpleAdapter中的from参数是hashmap，但value不一定非要是int 型的id才行，是bitmap也行，只不过后面再处理一下即可，移动端：：手机和电脑连接同一个wifi
package com.example.listview_8;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleAdapter.ViewBinder;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final int REQUEST_TIMEOUT = 5 * 1000;// 设置请求超时10秒钟
private static final int SO_TIMEOUT = 10 * 60 * 1000; // 设置请求超时时间10秒钟
private static final int LOGIN_OK = 1;
private Handler handler ;
private ListView lv1;
private int COUNT=5;//////COUNT=10时图片显示会乱序，有待改进
private Bitmap[] imagesId=new Bitmap[COUNT];
// private String[] names={"短毛猫"};
// private String[] mark={"可爱"};
// private String[] names={"短毛猫1","猴子2","兔子3","老鼠4","斑马5","短毛猫6","猴子7","兔子8","老鼠9","斑马10"};
// private String[] mark={"可爱1","顽皮2","温顺3","伶俐4","强壮5","可爱6","顽皮7","温顺8","伶俐9","强壮10"};
private String[] names={"短毛猫1","猴子1","兔子1","老鼠1","斑马1"};
private String[] mark={"可爱1","顽皮1","温顺1","伶俐1","强壮1"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv1 = (ListView) findViewById(R.id.listView1);
final List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();
for(int i=1;i<=COUNT;i++){
fun_HttpPost(i);
}
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO 自动生成的方法存根
///super.handleMessage(msg);
if((Bitmap)msg.obj!=null){
Log.i("==========================Bitmap)msg.obj==null===================", "Bitmap)msg.obj==null");
}
int num=msg.what-1;
imagesId[num]=(Bitmap)msg.obj;
// for(int i=msg.what-1;i<names.length;i++){
// Map<String,Object> listItem = new HashMap<String,Object>();
// listItem.put("face", imagesId[i]);
// listItem.put("name", names[i]);
// listItem.put("mark", mark[i]);
// listItems.add(listItem);
// }
Map<String,Object> listItem = new HashMap<String,Object>();
listItem.put("face", imagesId[num]);
listItem.put("name", names[num]);
listItem.put("mark", mark[num]);
listItems.add(listItem);
SimpleAdapter simleAdapter = new SimpleAdapter(MainActivity.this, listItems,
R.layout.custom_list ,new String[]{"face","name","mark"},
new int[]{R.id.face,R.id.name,R.id.mark});
simleAdapter.setViewBinder(new ViewBinder() {
public boolean setViewValue(View view, Object data,
String textRepresentation) {
// 判断是否为我们要处理的对象
if (view instanceof ImageView && data instanceof Bitmap) {
ImageView iv = (ImageView) view;
iv.setImageBitmap((Bitmap) data);
return true;
} else
return false;
}
});
lv1.setAdapter(simleAdapter);
}////handleMessage
};////handler = new Handler()
lv1.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO 自动生成的方法存根
Toast.makeText(MainActivity.this, "点击的是第"+position+"个条目", Toast.LENGTH_SHORT).show();
}
});
// Bitmap catBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.cat);
// Bitmap monkeyBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.monkey);
// Bitmap rabbitBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.rabbit);
// Bitmap ratBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.rat);
// Bitmap imagesId[]={catBitmap,monkeyBitmap,rabbitBitmap,ratBitmap};
}///onCreate
public void fun_HttpPost(final int i) {// //生成faceBitmap[]
new Thread(new Runnable() {// //在子线程中传递msg，主线程中接收msg;;要是用fun_HttpPost()的返回值会失败
@Override
public void run() {
// TODO 自动生成的方法存根
String urlStr = "http://192.168.0.101:8080/download/servlet/download";
HttpPost request = new HttpPost(urlStr);
// 如果传递参数多的话，可以对传递的参数进行封装
List<NameValuePair> params = new ArrayList<NameValuePair>();
// 设置要下载的头像名称
params.add(new BasicNameValuePair("picN", String
.valueOf(i)));
// params.add(new BasicNameValuePair("pic2","2"));
// params.add(new BasicNameValuePair("pic3","3"));
// params.add(new BasicNameValuePair("password",
// passwordString));
// params.add(new BasicNameValuePair("nickname",
// nicknameString));
try {
HttpClient client = getHttpClient();
request.setEntity(new UrlEncodedFormEntity(params,
HTTP.UTF_8));
// 执行请求返回相应
HttpResponse response = client.execute(request);
// 判断是否请求成功
if (response.getStatusLine().getStatusCode() == 200) {
// 获得响应信息
String responseMessage = EntityUtils
.toString(response.getEntity());
Log.i("responseMessage", responseMessage
+ ",长度：" + responseMessage.length());
Bitmap bitmap = GenerateImage(responseMessage);// //生成Bitmap
Message msg = new Message();
msg.what = i;
//
Log.i("------------------- msg.what=i---------------",
String.valueOf(i - 1));
//
msg.obj = bitmap;// //传递msg
handler.sendMessage(msg);
}
} catch (Exception e) {
e.printStackTrace();
}
}// //run()
}).start();
}// /fun_register()
// base64字符串转化成图片
public static Bitmap GenerateImage(String imgStr) { // 对字节数组字符串进行Base64解码并生成图片
if (imgStr == null) // 图像数据为空
{
Log.i("imgStr == null", "imgStr == null");
return setNullBitmapImage();
}
Decoder.BASE64Decoder decoder = new Decoder.BASE64Decoder();
try {
// Base64解码
byte[] b = decoder.decodeBuffer(imgStr);
for (int i = 0; i < b.length; ++i) {
if (b[i] < 0) {// 调整异常数据
b[i] += 256;
}
}
InputStream ins = new ByteArrayInputStream(b);
Bitmap bitmap = new BitmapFactory().decodeStream(ins);
return bitmap;
} catch (Exception e) {
Log.i("imgStr == null,catch (Exception e)",
"imgStr == null,catch (Exception e)");
return setNullBitmapImage();
}
}// /GenerateImage
private static Bitmap setNullBitmapImage() {
String filePath = "/sdcard/1spray/11.jpg";
File file = new File(filePath);
Bitmap bitmap = null;
try {
InputStream is = new FileInputStream(file);
bitmap = new BitmapFactory().decodeStream(is);
Log.i("setNullBitmapImage()", "setNullBitmapImage()");
// /imageView1.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
return bitmap;
}///setNullBitmapImage
// 初始化HttpClient，并设置超时
public HttpClient getHttpClient() {
BasicHttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, REQUEST_TIMEOUT);
HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT);
HttpClient client = new DefaultHttpClient(httpParams);
return client;
}// /public HttpClient getHttpClient()
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout><?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/face"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginLeft="57dp"
android:layout_marginTop="20dp"
android:layout_toRightOf="@+id/face"
android:paddingLeft="20dp"
android:text="TextView"
android:textSize="20sp" />
<TextView
android:id="@+id/mark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/name"
android:layout_below="@+id/name"
android:layout_marginTop="10dp"
android:textSize="15sp"
android:text="mark"
/>
</RelativeLayout></pre><pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.listview_8" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="15" android:targetSdkVersion="16" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <uses-permission android:name="android.permission.GET_ACCOUNTS" /> <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" /> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <uses-permission android:name="android.permission.GET_TASKS" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.READ_LOGS" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
</pre><pre name="code" class="html">
服务器端：：
package com;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sun.misc.BASE64Encoder;
public class download extends HttpServlet {
/**
* Constructor of the object.
*/
public download() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
// request.setCharacterEncoding("utf-8");////这句至关重要，不然中文的文件名称显示乱码
PrintWriter out = response.getWriter();
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String picN = request.getParameter("picN");
//String pic2 = request.getParameter("pic2");
// String password = request.getParameter("password");
// String nickname = request.getParameter("nickname");
// String faceImageString = request.getParameter("faceImage");
out.print(GetImageStr(picN));// /输出文件的字符串
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
public static String GetImageStr(String picName) {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
// String imgFile =
// "d://test.jpg";//待处理的图片
String imgFile = "F://upload//"+picName+".jpg";// //可以
// String imgFile = "F://upload//软工大作业.ppt";// //可以
// String imgFile="F://upload//爱的勇气.mp3";//可以
// String imgFile="F://upload//upload.rar";//可以
InputStream in = null;
byte[] data = null;
// 读取图片字节数组
try {
in = new FileInputStream(imgFile);
data = new byte[in.available()];
in.read(data);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);// 返回Base64编码过的字节数组字符串
} // /GetImageStr
}
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原文地址：http://blog.csdn.net/u010002184/article/details/51346238
