帮我写一个在Android服务中更新App的代码

以下是在Android服务中更新App的代码：//检查更新
private void checkForUpdates(){
String serverVersionUrl = "https://update.example.com/version";
String updateUrl = "https://update.example.com/update.apk"; //发送Http请求获取服务器端版本号
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(serverVersionUrl);
HttpResponse response = httpClient.execute(httpGet); //获取当前App版本号
int currentVersionCode = getPackageManager().getPackageInfo(getPackageName(), 0).versionCode; //比较版本号
if (Integer.parseInt(EntityUtils.toString(response.getEntity())) > currentVersionCode) {
//发现新版本，启动下载
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(updateUrl));
startActivity(intent);
}
}