Use foreground service to protect your progress being killed.

use startService to start service

use startForeground(NOTIFICATION_ID, notification); to prevent from desctroying.

use your lib.

PROFIT!

start service:

Intent intent = new Intent(this, HelloService.class);
startService(intent);

service class:
public class ExampleService extends Service {

    @Override
    public void onCreate() {
        // The service is being created
	showForegroundNotification("some service");
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // The service is starting, due to a call to startService()
        return mStartMode;
    }
    @Override
    public IBinder onBind(Intent intent) {
        // A client is binding to the service with bindService()
        return mBinder;
    }
    @Override

    @Override
    public void onDestroy() {
        // The service is no longer used and is being destroyed
    }
	private static final int NOTIFICATION_ID = 1;

 	private void showForegroundNotification(String contentText) {
		// Create intent that will bring our app to the front, as if it was tapped in the app
		// launcher
		Intent showTaskIntent = new Intent(getApplicationContext(), MyMainActivity.class);
		showTaskIntent.setAction(Intent.ACTION_MAIN);
		showTaskIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		showTaskIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

		PendingIntent contentIntent = PendingIntent.getActivity(
				getApplicationContext(),
				0,
				showTaskIntent,
				PendingIntent.FLAG_UPDATE_CURRENT);

		Notification notification = new Notification.Builder(getApplicationContext())
				.setContentTitle(getString(R.string.app_name))
				.setContentText(contentText)
				.setSmallIcon(R.drawable.ic_notification)
				.setWhen(System.currentTimeMillis())
				.setContentIntent(contentIntent)
				.build();
		startForeground(NOTIFICATION_ID, notification);
	}
}

androidManifest.xml

<service android:name=".ExampleService" . . . >
        </service>
put pass extrad data use with:

Intent intent = new Intent(this, HelloService.class);
intent.putExtra("MYPARAMNAME","MYURL");
startService(intent);

to retrieve use this:

onStartCommand(Intent intent, ...
Bundle extras = intent.getExtras();
filename = extras.getString("MYPARAMNAME");