Android：如何暂停和继续使用HttpUrlConnection下载？

Question

我想为Android做一个下载管理器，我想知道如何添加暂停和恢复功能我正在使用android的HttpUrlConnection类我还想知道如何访问从HttpUrlConnection.getInputStream（）获得的InputStream，该输入流由于Internet连接而中断（例如，用户关闭Internet连接）。任何示例代码都将有所帮助

Answer 1

下载器示例here

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
if(ISSUE_DOWNLOAD_STATUS.intValue()==ECMConstant.ECM_DOWNLOADING){
    File file=new File(DESTINATION_PATH);
    if(file.exists()){
         downloaded = (int) file.length();
         connection.setRequestProperty("Range", "bytes="+(file.length())+"-");
    }
}else{
    connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
}
connection.setDoInput(true);
connection.setDoOutput(true);
progressBar.setMax(connection.getContentLength());
 in = new BufferedInputStream(connection.getInputStream());
 fos=(downloaded==0)? new FileOutputStream(DESTINATION_PATH): new FileOutputStream(DESTINATION_PATH,true);
 bout = new BufferedOutputStream(fos, 1024);
byte[] data = new byte[1024];
int x = 0;
while ((x = in.read(data, 0, 1024)) >= 0) {
    bout.write(data, 0, x);
     downloaded += x;
     progressBar.setProgress(downloaded);
}

学分：https://stackoverflow.com/users/705297/pomatu