Scenario:
Activity starts a service to download n files(zip files)[n varies from 10 to 60, size of each file varies from 100 kb to 20 MB] sends List<String> urlsToBeDownloaded
In Service start method, first one file is kept for download, once file is downloaded(Using Android's Download manager) there is a broadcast receiver which receives and process the file for unzipping. Once file is zipped, another file is kept for download. The code is like this:
public class DownloadService extends Service {
List<String> urlsToBeDownloaded;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// set urlsToBeDownloaded
registerReceiver(onComplete, new IntentFilter(
DownloadManager.ACTION_DOWNLOAD_COMPLETE));
Utility.downloadFromUrl(urlsToBeDownloaded.get(0),this);
}
BroadcastReceiver onComplete = new BroadcastReceiver() {
public void onReceive(Context ctxt, Intent intent) {
new ProcessNext().execute(intent);
}
};
ProcessNext extends AsyncTask<Intent, Integer, Integer> {
@Override
protected Integer doInBackground(Intent... params) {
return processNext(params[0]);
}
}
protected int processNext(Intent intent) {
Query query = new Query();
ObjectOutputStream oos = null;
Long dwnId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,
0);
query.setFilterById(dwnId);
DownloadManager manager = (DownloadManager) (this)
.getSystemService(Context.DOWNLOAD_SERVICE);
Cursor cursor = manager.query(query);
if (cursor.moveToFirst()) {
int status = cursor.getInt(cursor
.getColumnIndex(DownloadManager.COLUMN_STATUS));
String title = cursor.getString(cursor
.getColumnIndex(DownloadManager.COLUMN_TITLE));
File f1 = new File(Environment
.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS)
.getAbsolutePath()
+ "/" + title);
if (status == DownloadManager.STATUS_SUCCESSFUL) {
Utility.extractFile(title);
urlsToBeDownloaded.remove(0);
if(urlsToBeDownloaded.size() != 0)
Utility.downloadFromUrl(urlsToBeDownloaded.get(0))
else
//show done message
}
}
}
}
What I'm trying to do here is in sequence, means a file will be processed for download only if the previous file is downloaded and extracted.
Problem:
When I see download folder, there are multiple files getting downloaded at a time. I am not able to understand how multiple files are downloading. Is there a way to fix it to sequential download?
