android 程序自动更新

public ProgressDialog pBar;      private Handler handler = new Handler();  public void updatedialog(){Dialog dialog = new AlertDialog.Builder(index.this).setTitle("系统更新")          .setMessage("发现新版本，请更新！")// 设置内容          .setPositiveButton("确定",// 设置确定按钮                  new DialogInterface.OnClickListener() {                      public void onClick(DialogInterface dialog,                              int which) {                          pBar = new ProgressDialog(index.this);                          pBar.setTitle("正在下载");                          pBar.setMessage("请稍候...");                          pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);                          downFile("http://192.168.1.102:7070/hessian/OA.apk");                       }                  }).setNegativeButton("取消",                    new DialogInterface.OnClickListener() {                      public void onClick(DialogInterface dialog,                              int whichButton) {                          // 点击"取消"按钮之后退出程序                      }                  }).create();// 创建  // 显示对话框  dialog.show();  }  void downFile(final String url) {      pBar.show();      new Thread() {          public void run() {              HttpClient client = new DefaultHttpClient();              // params[0]代表连接的url              HttpGet get = new HttpGet(url);              HttpResponse response;              try {                  response = client.execute(get);                  HttpEntity entity = response.getEntity();                  long length = entity.getContentLength();                  InputStream is = entity.getContent();                  FileOutputStream fileOutputStream = null;                  if (is != null) {                      File file = new File(Environment                              .getExternalStorageDirectory(), "OA.apk");                     fileOutputStream = new FileOutputStream(file);                      byte[] buf = new byte[1024];                      int ch = -1;                      int count = 0;                      while ((ch = is.read(buf)) != -1) {                          // baos.write(buf, 0, ch);                          fileOutputStream.write(buf, 0, ch);                          count += ch;                          if (length > 0) {                          }                      }                  }                  fileOutputStream.flush();                  if (fileOutputStream != null) {                      fileOutputStream.close();                  }                  down();              } catch (ClientProtocolException e) {                  // TODO Auto-generated catch block                  e.printStackTrace();              } catch (IOException e) {                  // TODO Auto-generated catch block                  e.printStackTrace();              }          }      }.start();  }  void down() {      handler.post(new Runnable() {          public void run() {              pBar.cancel();              update();          }      });  }  void update() {        Intent intent = new Intent(Intent.ACTION_VIEW);      intent.setDataAndType(Uri.fromFile(new File("/sdcard/OA.apk")),              "application/vnd.android.package-archive");      startActivity(intent);  }
读写SD卡需要开放权限:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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