Download file with pause and resume button?

问题

I've googled much and I don't find my solution about two pause and resume button.
I use from this code and this .
But I don't know how implement pause and resume capability and set what to my pause and resume button onclick event:

pausebtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            stopdownload(); AND resumedownload(); <------
        }
    });

Thanks in advance.

回答1:

To stop download call

downloadTask.cancel(false);

To support resuming download you can use the code from Resume http file download in java:

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);
}

来源：https://stackoverflow.com/questions/25480725/download-file-with-pause-and-resume-button