Android下载文件的进度条提示（网络通信部分示例）

URL url = newURL(http://somewhere.com/some/webhosted/file);

HttpURLConnectionurlConnection = (HttpURLConnection)
url.openConnection();

urlConnection.setRequestMethod("GET");

urlConnection.setDoOutput(true);

urlConnection.connect();

File SDCardRoot = Environment.getExternalStorageDirectory();

File file = new File(SDCardRoot,"somefile.ext");

FileOutputStream fileOutput = new FileOutputStream(file);

InputStream inputStream = urlConnection.getInputStream();

int totalSize = urlConnection.getContentLength();

pd.setMax(totalSize);//ProgressDialog  pd

int downloadedSize = 0;

byte[] buffer = new byte[1024];

int bufferLength = 0;

while ( (bufferLength = inputStream.read(buffer)) > 0 ) {

fileOutput.write(buffer, 0, bufferLength);

downloadedSize += bufferLength; ;

pd.setProgress(downloadedSize);//ProgressDialog  pd

}