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android自动更新软件版本

根据网上的然后小改
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;


import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;


public class UpdateManager { 
   private Context mContext; 
   private final String updateMsg = "亲,有新版本,要更新吗!";            //下载消息提示 
   private Dialog noticeDialog;                                        //下载提示对话框 
   private Dialog downloadDialog;                                      //下载进度对话框 
   private ProgressBar mProgressBar;                                   //进度条 
   private Boolean interceptFlag = false;                              //标记用户是否在下载过程中取消下载 
   private Thread downloadApkThread = null;                            //下载线程 
   private final String apkUrl = "http://www.xxx/xxx.apk";       //apk的URL地址 
   private final String savePath = "/sdcard/UpdateDemo/";              //下载的apk存放的路径 
   private final String saveFileName = savePath + "xxx.apk";   //下载的apk文件 
   private int progress = 0;                                           //下载进度 
   private final int DOWNLOAD_ING = 1;                                 //标记正在下载 
   private final int DOWNLOAD_OVER = 2;                                //标记下载完成 
   private final String TAG="版本更新"; 
   //日志打印标签 
   private Handler mhandler = new Handler() {                          //更新UI的handler 
 
       @Override 
       public void handleMessage(Message msg) { 
           super.handleMessage(msg); 
           switch (msg.what) { 
           case DOWNLOAD_ING: 
               // 更新进度条 
               mProgressBar.setProgress(progress); 
               break; 
           case DOWNLOAD_OVER: 
               downloadDialog.dismiss(); 
               installApk(); 
               //安装 
               break; 
           default: 
               break; 
           } 
       } 
 
   }; 
    
   /*
    * 构造方法
    */ 
   public UpdateManager(Context context) { 
       this.mContext = context; 
   } 
 
   /*
    * 检查是否有需要更新,具体比较版本xml
    */ 
   public void checkUpdate() { 
       // 到服务器检查软件是否有新版本 
       //如果有则 
       showNoticeDialog(); 
   } 
 
   /*
    * 显示版本更新对话框
    */ 
   private void showNoticeDialog() { 
       AlertDialog.Builder builder = new Builder(mContext); 
       builder.setTitle("版本更新"); 
       builder.setMessage(updateMsg); 
       builder.setPositiveButton("更新", new OnClickListener() { 
 
           public void onClick(DialogInterface dialog, int which) { 
               noticeDialog.dismiss(); 
               showDownloadDialog(); 
           } 
       }); 
       builder.setNegativeButton("以后再说", new OnClickListener() { 
 
           public void onClick(DialogInterface dialog, int which) { 
               noticeDialog.dismiss(); 
           } 
       }); 
       noticeDialog = builder.create(); 
       noticeDialog.show(); 
 
   } 
 
   /*
    * 弹出下载进度对话框
    */ 
   private void showDownloadDialog() { 
       AlertDialog.Builder builder = new Builder(mContext); 
       builder.setTitle("软件更新"); 
       final LayoutInflater inflater = LayoutInflater.from(mContext); 
       View v = inflater.inflate(R.layout.progress, null); 
       mProgressBar = (ProgressBar) v.findViewById(R.id.updateProgress); 
       builder.setView(v); 
       builder.setNegativeButton("取消", new OnClickListener() { 
 
           public void onClick(DialogInterface dialog, int which) { 
               downloadDialog.dismiss(); 
               interceptFlag = true; 
           } 
       }); 
       downloadDialog = builder.create(); 
       downloadDialog.show(); 
       downloadLatestVersionApk(); 
 
   } 
    
   /*
    * 下载最新的apk文件
    */ 
   private void downloadLatestVersionApk() { 
       downloadApkThread = new Thread(downloadApkRunnable); 
       downloadApkThread.start(); 
   } 
    
   //匿名内部类,apk文件下载线程 
   private Runnable downloadApkRunnable = new Runnable() { 
 
       public void run() { 
           try { 
               URL url = new URL(apkUrl); 
               HttpURLConnection conn = (HttpURLConnection) url 
                       .openConnection(); 
               conn.setConnectTimeout(5*1000);
               conn.connect(); 
               int length = conn.getContentLength(); 
               Log.e(TAG, "总字节数:"+length); 
               InputStream is = conn.getInputStream(); 
               File file = new File(savePath); 
               if (!file.exists()) { 
                   file.mkdir(); 
               } 
               File apkFile = new File(saveFileName); 
               FileOutputStream out = new FileOutputStream(apkFile); 
               int count = 0; 
               int readnum = 0; 
               byte[] buffer = new byte[1024]; 
               do { 
                   readnum = is.read(buffer); 
                   count += readnum; 
                   progress = (int) (((float) count / length) * 100); 
                   Log.e(TAG, "下载进度"+progress); 
                   mhandler.sendEmptyMessage(DOWNLOAD_ING); 
                   if (readnum <= 0) { 
                       // 下载结束 
                       mhandler.sendEmptyMessage(DOWNLOAD_OVER); 
                       break; 
                   } 
                   out.write(buffer,0,readnum); 
               } while (!interceptFlag); 
               is.close(); 
               out.close(); 
           } catch (MalformedURLException e) { 
               e.printStackTrace(); 
           } catch (IOException e) { 
               e.printStackTrace(); 
           } 
 
       } 
   }; 
   /*
    * 安装下载的apk文件
    */ 
   private void installApk() { 
       File file= new File(saveFileName); 
       if(!file.exists()){ 
           return; 
       } 
       Intent intent= new Intent(Intent.ACTION_VIEW); 
       intent.setDataAndType(Uri.parse("file://"+file.toString()), "application/vnd.android.package-archive"); 
       mContext.startActivity(intent); 
   } 
} 

 


 

 

补充:移动开发 , Android ,
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