public class DownloadAudio extends AsyncTask<Void, Void, String> {

public static final String TAG = DownloadAudio.class.getSimpleName();

ProgressDialog mProgressDialog;

Context context;
String stringUrl;
int index;

public DownloadAudio(Context context,String url, int randomNumber) {
this.context = context;

stringUrl=url;

index = randomNumber;

}

protected void onPreExecute() {
mProgressDialog = ProgressDialog.show(context, "Please wait", "Download …");
}

@override
protected String doInBackground(Void... voids) {
try {

URL url = new URL(stringUrl);
HttpURLConnection c = (HttpURLConnection) url.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
String[] path = url.getPath().split("/");
int temp = path.length - 1;
String mp3 = path[temp];
int lengthOfFile = c.getContentLength();

String PATH = Environment.getExternalStorageDirectory()+ "/MyAudioApp/" ;
Log.v(TAG, "PATH: " + PATH);
File file = new File(PATH);
file.mkdirs();

String fileName = mp3;

File outputFile = new File(file , fileName);


FileOutputStream fos = new FileOutputStream(outputFile);

InputStream is = c.getInputStream();

byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {

fos.write(buffer, 0, len1);
}
fos.close();
is.close();

} catch (IOException e) {
e.printStackTrace();
}

return "done";
}

protected void onPostExecute(String result) {
if (result.equals("done")) {
mProgressDialog.dismiss();
}
}

}

Please any suggestions would be very helpful.

Thanks​