Android编程实现自动检测版本及自动升级的方法

/* * 获取当前程序的版本号 */private String getVersionName() throws Exception{  //获取packagemanager的实例  PackageManager packageManager = getPackageManager();  //getPackageName()是你当前类的包名，0代表是获取版本信息  PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0);  return packInfo.versionName;}

/* * 用pull解析器解析服务器返回的xml文件 (xml封装了版本号) */public static UpdataInfo getUpdataInfo(InputStream is) throws Exception{  XmlPullParser parser = Xml.newPullParser();  parser.setInput(is, "utf-8");//设置解析的数据源  int type = parser.getEventType();  UpdataInfo info = new UpdataInfo();//实体  while(type != XmlPullParser.END_DOCUMENT ){    switch (type) {    case XmlPullParser.START_TAG:      if("version".equals(parser.getName())){        info.setVersion(parser.nextText()); //获取版本号      }else if ("url".equals(parser.getName())){        info.setUrl(parser.nextText()); //获取要升级的APK文件      }else if ("description".equals(parser.getName())){        info.setDescription(parser.nextText()); //获取该文件的信息      }      break;    }    type = parser.next();  }  return info;}

public static File getFileFromServer(String path, ProgressDialog pd) throws Exception{  //如果相等的话表示当前的sdcard挂载在手机上并且是可用的  if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){    URL url = new URL(path);    HttpURLConnection conn = (HttpURLConnection) url.openConnection();    conn.setConnectTimeout(5000);    //获取到文件的大小    pd.setMax(conn.getContentLength());    InputStream is = conn.getInputStream();    File file = new File(Environment.getExternalStorageDirectory(), "updata.apk");    FileOutputStream fos = new FileOutputStream(file);    BufferedInputStream bis = new BufferedInputStream(is);    byte[] buffer = new byte[1024];    int len ;    int total=0;    while((len =bis.read(buffer))!=-1){      fos.write(buffer, 0, len);      total+= len;      //获取当前下载量      pd.setProgress(total);    }    fos.close();    bis.close();    is.close();    return file;  }  else{    return null;  }}

/* * 从服务器获取xml解析并进行比对版本号 */public class CheckVersionTask implements Runnable{  public void run() {    try {      //从资源文件获取服务器 地址      String path = getResources().getString(R.string.serverurl);      //包装成url的对象      URL url = new URL(path);      HttpURLConnection conn = (HttpURLConnection) url.openConnection();      conn.setConnectTimeout(5000);      InputStream is =conn.getInputStream();      info = UpdataInfoParser.getUpdataInfo(is);      if(info.getVersion().equals(versionname)){        Log.i(TAG,"版本号相同无需升级");        LoginMain();      }else{        Log.i(TAG,"版本号不同 ,提示用户升级 ");        Message msg = new Message();        msg.what = UPDATA_CLIENT;        handler.sendMessage(msg);      }    } catch (Exception e) {      // 待处理      Message msg = new Message();      msg.what = GET_UNDATAINFO_ERROR;      handler.sendMessage(msg);      e.printStackTrace();    }  }}Handler handler = new Handler(){  @Override  public void handleMessage(Message msg) {    // TODO Auto-generated method stub    super.handleMessage(msg);    switch (msg.what) {    case UPDATA_CLIENT:      //对话框通知用户升级程序      showUpdataDialog();      break;    case GET_UNDATAINFO_ERROR:      //服务器超时      Toast.makeText(getApplicationContext(), "获取服务器更新信息失败", 1).show();      LoginMain();      break;    case DOWN_ERROR:      //下载apk失败      Toast.makeText(getApplicationContext(), "下载新版本失败", 1).show();      LoginMain();      break;    }  }};/* * * 弹出对话框通知用户更新程序 * * 弹出对话框的步骤： * 1.创建alertDialog的builder. * 2.要给builder设置属性, 对话框的内容,样式,按钮 * 3.通过builder 创建一个对话框 * 4.对话框show()出来 */protected void showUpdataDialog() {  AlertDialog.Builder builer = new Builder(this) ;  builer.setTitle("版本升级");  builer.setMessage(info.getDescription());  //当点确定按钮时从服务器上下载 新的apk 然后安装  builer.setPositiveButton("确定", new OnClickListener() {  public void onClick(DialogInterface dialog, int which) {      Log.i(TAG,"下载apk,更新");      downLoadApk();    }  });  //当点取消按钮时进行登录  builer.setNegativeButton("取消", new OnClickListener() {    public void onClick(DialogInterface dialog, int which) {      // TODO Auto-generated method stub      LoginMain();    }  });  AlertDialog dialog = builer.create();  dialog.show();}/* * 从服务器中下载APK */protected void downLoadApk() {  final ProgressDialog pd;  //进度条对话框  pd = new ProgressDialog(this);  pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);  pd.setMessage("正在下载更新");  pd.show();  new Thread(){    @Override    public void run() {      try {        File file = DownLoadManager.getFileFromServer(info.getUrl(), pd);        sleep(3000);        installApk(file);        pd.dismiss(); //结束掉进度条对话框      } catch (Exception e) {        Message msg = new Message();        msg.what = DOWN_ERROR;        handler.sendMessage(msg);        e.printStackTrace();      }    }}.start();}//安装apkprotected void installApk(File file) {  Intent intent = new Intent();  //执行动作  intent.setAction(Intent.ACTION_VIEW);  //执行的数据类型  intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");  startActivity(intent);}/* * 进入程序的主界面 */private void LoginMain(){  Intent intent = new Intent(this,MainActivity.class);  startActivity(intent);  //结束掉当前的activity  this.finish();}

public class UpdataInfo {  private String version;  private String url;  private String description;  public String getVersion() {    return version;  }  public void setVersion(String version) {    this.version = version;  }  public String getUrl() {    return url;  }  public void setUrl(String url) {    this.url = url;  }  public String getDescription() {    return description;  }  public void setDescription(String description) {    this.description = description;  }}

<?xml version="1.0" encoding="utf-8"?><info>  <version>2.0</version>  <url>http://192.168.1.187:8080/mobilesafe.apk</url>  <description>检测到最新版本，请及时更新！</description></info>