I have a player in which you can download songs. For downloading at the moment I use IntentService , which looks like this:

 public class DownloadService extends IntentService implements ApiResponse.ApiFailureListener { public static final String ACTION_DOWNLOAD_STARTED = "com.example.uncolor.action.DOWNLOAD_STARTED"; public static final String ACTION_DOWNLOAD_COMPLETED = "com.example.uncolor.action.DOWNLOAD_COMPLETED"; public static final String ACTION_DOWNLOAD_FAILURE = "com.example.uncolor.action.DOWNLOAD_FAILURE"; public static final String ARG_MUSIC = "music"; public DownloadService() { super("Download Service"); } private BaseMusic music; @Override public void onStart(@Nullable Intent intent, int startId) { App.Log("onStart service"); super.onStart(intent, startId); } @Override protected void onHandleIntent(Intent intent) { App.Log("onHandleIntent service"); Bundle extras = intent.getExtras(); if (extras != null) { music = extras.getParcelable("music"); if(music != null) { App.Log("download url: " + music.getDownload()); } } if(music == null){ App.Log("music null"); sendIntent(ACTION_DOWNLOAD_FAILURE); return; } String artist = ""; String title = ""; if(music.getArtist() != null){ artist = music.getArtist(); } if(music.getTitle() != null){ title = music.getTitle(); } File outputFile = new File(Environment .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), artist + " - " + title + ".mp3"); String uriFromFile = Uri.fromFile(outputFile).toString(); App.Log("Uri from file: " + uriFromFile); initDownload(); } private void initDownload() { App.Log("init download"); onDownloadStarted(ACTION_DOWNLOAD_STARTED); Api.getSource().downloadFile(music.getDownload()).enqueue(ApiResponse .getCallback(getDownloadCallback(), this)); } private ApiResponse.ApiResponseListener<ResponseBody> getDownloadCallback() { return new ApiResponse.ApiResponseListener<ResponseBody>() { @Override public void onResponse(ResponseBody result) { try { downloadFile(result); } catch (IOException e) { e.printStackTrace(); } } }; } private void downloadFile(ResponseBody body) throws IOException { App.Log("download file"); int count; byte data[] = new byte[1024 * 4]; long fileSize = body.contentLength(); InputStream bis = new BufferedInputStream(body.byteStream(), 1024 * 8); String artist = ""; String title = ""; if(music.getArtist() != null){ artist = music.getArtist(); } if(music.getTitle() != null){ title = music.getTitle(); } File outputFile = new File(Environment .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), artist + " - " + title + ".mp3"); OutputStream output = new FileOutputStream(outputFile); long total = 0; long startTime = System.currentTimeMillis(); int timeCount = 1; while ((count = bis.read(data)) != -1) { total += count; int totalFileSize = (int) (fileSize / (Math.pow(1024, 2))); double current = Math.round(total / (Math.pow(1024, 2))); int progress = (int) ((total * 100) / fileSize); long currentTime = System.currentTimeMillis() - startTime; Download download = new Download(); download.setTotalFileSize(totalFileSize); if (currentTime > 1000 * timeCount) { download.setCurrentFileSize((int) current); download.setProgress(progress); timeCount++; } output.write(data, 0, count); } App.Log("output path: " + outputFile.getAbsolutePath()); music.setLocalPath(outputFile.getAbsolutePath()); onDownloadComplete(ACTION_DOWNLOAD_COMPLETED); output.flush(); output.close(); bis.close(); App.Log("download complete"); } @Override public void onDestroy() { super.onDestroy(); App.Log("onDestroy Download service"); } private void sendIntent(String action) { App.Log("send intent"); Intent intent = new Intent(); intent.setAction(action); intent.putExtra(ARG_MUSIC, music); sendBroadcast(intent); } private void onDownloadComplete(String action) { App.Log("onDownloadComplete"); sendIntent(action); } private void onDownloadStarted(String action) { App.Log("onDownloadStarted"); sendIntent(action); } @Override public void onTaskRemoved(Intent rootIntent) { } @Override public void onFailure(int code, String message) { App.Log("Download failure"); sendIntent(ACTION_DOWNLOAD_FAILURE); } }

The problem with this class is that I cannot find out the progress of the download at boot time (1%, 2% ... and so on) and display it in the Activity . I would like to know how best to download files. Maybe it would be better to use the usual Service ? It is necessary to create a queue of downloads ... Thank you in advance for your help!

    1 answer 1

    For downloading, I recommend using DownloadManager to read here . It can be configured to display a notification about the file download and is just right for your purposes, put in the download queue.

    Get DownloadManager you can:

     ((DownloadManager) context.getSystemService(DOWNLOAD_SERVICE))

    Example of use ( request - your request):

     Request request = DownloadManager.Request(Uri.parse("твой URL")) //Устанавливаем уведомление, которое будет отображать процесс загрузки .setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED) .setTitle("твое название файла") //папка назначения куда скачается файл .setDestinationInExternalFilesDir( context, Environment.DIRECTORY_DOWNLOADS, fileName + fileExtension ) //Складываем твой запрос в очередь для скачивания downloadManager.enqueue(request)