android软件自动升级

package com.henyvision.tool;

import java.io.BufferedReader;
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;  
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.henyvision.flow.R;

import android.app.AlertDialog;  
import android.app.AlertDialog.Builder;  
import android.app.Dialog;  
import android.content.Context;  
import android.content.DialogInterface;  
import android.content.Intent;  
import android.content.DialogInterface.OnClickListener;  
import android.content.pm.PackageManager.NameNotFoundException;  
import android.net.Uri;  
import android.os.Environment;  
import android.os.Handler;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.widget.ProgressBar;  
import android.widget.Toast;  
  
  
/** 
 *  
 * @author wwj 
 * @date 2012/11/17 
 * 实现软件更新的管理类 
 */  
public class UpdateManager {  
      
    //下载中...  
    private static final int DOWNLOAD = 1;  
    //下载完成  
    private static final int DOWNLOAD_FINISH = 2;  
    //保存解析的XML信息  
    HashMap<String , String> mHashMap=new HashMap<String , String>();  
    //下载保存路径  
    private String mSavePath;  
    //记录进度条数量  
    private int progress;  
    //是否取消更新  
    private boolean cancelUpdate = false;  
    //上下文对象  
    private Context mContext;  
    //进度条  
    private ProgressBar mProgressBar;  
    //更新进度条的对话框  
    private Dialog mDownloadDialog;  
      
      
    private Handler mHandler = new Handler() {  
        public void handleMessage(android.os.Message msg) {  
            switch(msg.what){  
            //下载中。。。  
            case DOWNLOAD:  
                //更新进度条  
                System.out.println(progress);  
                mProgressBar.setProgress(progress);  
                break;  
            //下载完成  
            case DOWNLOAD_FINISH:  
                // 安装文件  
                installApk();  
                break;  
            }  
        };  
    };  
  
  
    public UpdateManager(Context context) {  
        super();  
        this.mContext = context;  
    }  
      
      
    /** 
     * 检测软件更新 
     */  
    public void checkUpdate() {  
        if (isUpdate()) {  
            //显示提示对话框  
            showNoticeDialog();  
        } else {  
            Toast.makeText(mContext, "您现在已经是最新版本了，无需更新", Toast.LENGTH_SHORT).show();  
        }  
          
    }  
      
    private void showNoticeDialog() {  
        // TODO Auto-generated method stub  
        //构造对话框  
        AlertDialog.Builder builder = new Builder(mContext);  
        builder.setTitle("软件提示");  
        builder.setMessage("系统检测到新版本");  
        //更新  
        builder.setPositiveButton("更新", new OnClickListener() {  
              
            @Override  
            public void onClick(DialogInterface dialog, int which) {  
                // TODO Auto-generated method stub  
                dialog.dismiss();  
                // 显示下载对话框  
                showDownloadDialog();  
            }  
        });  
        // 稍后更新  
        builder.setNegativeButton("暂不更新", new OnClickListener() {  
              
            @Override  
            public void onClick(DialogInterface dialog, int which) {  
                // TODO Auto-generated method stub  
                dialog.dismiss();  
            }  
        });  
        Dialog noticeDialog = builder.create();  
        noticeDialog.show();  
    }  
      
    private void showDownloadDialog() {  
        // 构造软件下载对话框  
        AlertDialog.Builder builder = new Builder(mContext);  
        builder.setTitle("正在下载");  
        // 给下载对话框增加进度条  
        final LayoutInflater inflater = LayoutInflater.from(mContext);  
        View view = inflater.inflate(R.layout.app_update, null);  
        mProgressBar = (ProgressBar) view.findViewById(R.id.progressBar1);  
        builder.setView(view);  
        builder.setNegativeButton("取消安装", new OnClickListener() {  
            @Override  
            public void onClick(DialogInterface dialog, int which) {  
                // TODO Auto-generated method stub  
                dialog.dismiss();  
                // 设置取消状态  
                cancelUpdate = true;  
            }  
        });  
        mDownloadDialog = builder.create();  
        mDownloadDialog.show();  
        //下载文件  
        downloadApk();  
    }  
      
    /** 
     * 下载APK文件 
     */  
    private void downloadApk() {  
        // TODO Auto-generated method stub  
        // 启动新线程下载软件  
        new DownloadApkThread().start();  
    }  
  
  
    /** 
     * 检查软件是否有更新版本 
     * @return  
     * @throws JSONException 
     */  
    public boolean isUpdate(){  
        BufferedReader in = null;
        // 获取当前软件版本  
        int versionCode = getVersionCode(mContext);  
        try {  
            URI uri = new URI(ConstantConfig.http + ConstantConfig.ip + ConstantConfig.webName + "repairBill/getVersionMobile.action");
            URL url = uri.toURL();
            URLConnection connection = url.openConnection();
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            connection.setRequestProperty("Charset", "utf-8");
            connection.connect();
            String result ="";
            //读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result+=line;
            }
            JSONObject jsonObj = new JSONObject(result);
            Iterator<String> nameItr = jsonObj.keys();
            String name;
            while (nameItr.hasNext()) {
                name = nameItr.next();
                mHashMap.put(name, jsonObj.getString(name));
            } 
        } catch (Exception e) {  
            e.printStackTrace();  
        }finally {
            try {
                if (in != null) in.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        if(null != mHashMap) {  
            int serviceCode = Integer.valueOf(mHashMap.get("version"));  
            //版本判断  
            if(serviceCode > versionCode) {  
                return true;  
            }  
        }  
        return false;  
    }  
  
    /** 
     * 获取软件版本号 
     * @param context 
     * @return 
     */  
    private int getVersionCode(Context context) {  
        // TODO Auto-generated method stub  
        int versionCode = 0;  
  
        // 获取软件版本号，对应AndroidManifest.xml下android:versionCode  
        try {  
            versionCode = context.getPackageManager().getPackageInfo(  
                    "com.henyvision.flow", 0).versionCode;  
        } catch (NameNotFoundException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
        return versionCode;  
    }  
      
    /** 
     * 下载文件线程 
     * @author Administrator 
     * 
     */  
    private class DownloadApkThread extends Thread {  
        @Override  
        public void run() {  
            try  
            {  
                //判断SD卡是否存在，并且是否具有读写权限  
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))  
                {  
                    // 获取SDCard的路径  
                    String sdpath = Environment.getExternalStorageDirectory() + "/";  
                    mSavePath = sdpath + "download";  
                    URL url = new URL(mHashMap.get("url"));  
                    // 创建连接  
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
                    conn.connect();  
                    // 获取文件大小  
                    int length = conn.getContentLength();  
                    // 创建输入流  
                    InputStream is = conn.getInputStream();  
  
                    File file = new File(mSavePath);  
                    // 如果文件不存在，新建目录  
                    if (!file.exists())  
                    {  
                        file.mkdir();  
                    }  
                    File apkFile = new File(mSavePath, mHashMap.get("name"));  
                    FileOutputStream fos = new FileOutputStream(apkFile);  
                    int count = 0;  
                    // 缓存  
                    byte buf[] = new byte[1024];  
                    // 写入到文件中  
                    do  
                    {  
                        int numread = is.read(buf);  
                        count += numread;  
                        // 计算进度条的位置  
                        progress = (int) (((float) count / length) * 100);  
                        // 更新进度  
                        mHandler.sendEmptyMessage(DOWNLOAD);  
                        if (numread <= 0)  
                        {  
                            // 下载完成  
                            mHandler.sendEmptyMessage(DOWNLOAD_FINISH);  
                            break;  
                        }  
                        // 写入文件  
                        fos.write(buf, 0, numread);  
                    } while (!cancelUpdate);//点击取消就停止下载  
                    fos.close();  
                    is.close();  
                }  
            } catch (MalformedURLException e)  
            {  
                e.printStackTrace();  
            } catch (IOException e)  
            {  
                e.printStackTrace();  
            }  
            // 取消下载对话框显示  
            mDownloadDialog.dismiss();  
        }  
    }  
      
    /** 
     * 安装APK文件 
     */  
    private void installApk()  
    {  
        
//        String fileName = mSavePath + mHashMap.get("name");
//
//        Uri uri = Uri.fromFile(new File(fileName));
//
//        Intent intent = new Intent(Intent.ACTION_VIEW);
//        intent.setDataAndType(uri, "application/vnd.Android.package-archive");
//
//        mContext.startActivity(intent);
        
        File apkfile = new File(mSavePath, mHashMap.get("name"));  
        if (!apkfile.exists())  
        {  
            return;  
        }  
        Intent i = new Intent(Intent.ACTION_VIEW);  
        i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");  
        mContext.startActivity(i);  
    }
    
}  

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

    <ProgressBar
        android:id="@+id/progressBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>