Download Manger not working in Android Pie 9.0 NetworkSecurityConfig: No Network Security Config specified, using platform default

Question

On updating the device OS to Android 9.0, previously this code was working fine(Xiaomi mi A2). Now, files are not being downloaded on Android Pie

Answer 1

This worked for me After Xiaomi mi A2 received software update notification today.

what worked for me

Add android:networkSecurityConfig="@xml/network_security_config" in application tag

<application
        android:name=".ApplicationClass"
        android:allowBackup="true"
        android:hardwareAccelerated="false"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:largeHeap="true"
        android:networkSecurityConfig="@xml/network_security_config"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

where network_security_config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true" />
</network-security-config>

Create xml under res directory and then network_security_config.xml in xml folder like in the picture below

This explains the issue in software

Answer 2

Use this Service class

---

public class DownloadService extends IntentService {
public DownloadService() {
    super("Download Service");
}

String CHANNEL_ID1 = "Download Notification";
String CHANNEL_NAME1 = "Download Notification";
private NotificationManager notificationManager;
private int totalFileSize;
String name;
String url;
NotificationCompat.Builder builder;
@Override
protected void onHandleIntent(Intent intent) {
    name = intent.getStringExtra("name");
    url = intent.getStringExtra("url");

    createChannels();
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
    Uri sounduri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    builder = new NotificationCompat.Builder(this, CHANNEL_ID1);
    builder.setContentTitle("Download");
    builder.setContentText("Downloading File");
    builder.setContentIntent(pendingIntent);
    builder.setSmallIcon(R.mipmap.ic_launcher);
    Bitmap bm = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
    builder.setLargeIcon(bm);
    builder.setSound(null);
    builder.setAutoCancel(true);
    notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notificationManager.notify(0, builder.build());


    initDownload();

}

private void initDownload() {

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("Your Url") //Url Base here
            .build();

    RetrofitInterface retrofitInterface = retrofit.create(RetrofitInterface.class);

    Call<ResponseBody> request = retrofitInterface.downloadFile(url);// pass your Url
    try {

        downloadFile(request.execute().body());

    } catch (IOException e) {

        e.printStackTrace();
        Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();

    }
}
private void downloadFile(ResponseBody body) throws IOException {

    String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Folder name";
    File folder = new File(path);
    if (!folder.exists()) {
        folder.mkdir();
    }
    int count;
    byte data[] = new byte[1024 * 4];
    long fileSize = body.contentLength();
    InputStream bis = new BufferedInputStream(body.byteStream(), 1024 * 8);
    File outputFile = new File(path, name + ".mp3");// file name & extension
    OutputStream output = new FileOutputStream(outputFile);
    long total = 0;
    long startTime = System.currentTimeMillis();
    int timeCount = 1;
    while ((count = bis.read(data)) != -1) {

        total += count;
        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);
            sendNotification(download);
            timeCount++;
        }

        output.write(data, 0, count);
    }
    onDownloadComplete();
    output.flush();
    output.close();
    bis.close();

}

private void sendNotification(Download download) {
    builder.setProgress(100, download.getProgress(), false);
    builder.setContentText("Downloading file " + download.getCurrentFileSize() + "/" + totalFileSize + " MB");
    notificationManager.notify(0, builder.build());
}


private void onDownloadComplete() {

    Download download = new Download();
    download.setProgress(100);
    notificationManager.cancel(0);
    builder.setProgress(0, 0, false);
    builder.setContentText("File Downloaded");
    //builder.setVibrate(null);
    notificationManager.notify(0, builder.build());
}

@Override
public void onTaskRemoved(Intent rootIntent) {
    notificationManager.cancel(0);
}

public void createChannels() {

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        NotificationChannel notifiCationChannel = new NotificationChannel(CHANNEL_ID1, CHANNEL_NAME1, NotificationManager.IMPORTANCE_DEFAULT);
        notifiCationChannel.enableLights(true);
        notifiCationChannel.enableVibration(false);
        notifiCationChannel.setLightColor(Color.GREEN);
        notifiCationChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
        notifiCationChannel.setShowBadge(true);
        notifiCationChannel.setSound(null,null);
        notificationManager.createNotificationChannel(notifiCationChannel);

    }
}
}

---

Call this method from Your activity/fragment and pass url and name

private fun startDownload() {
    val intent = Intent(this, DownloadService::class.java)
    intent.putExtra("name", name)
    intent.putExtra("url", url)
    startService(intent)

}

---

Retrofit Interface 

interface RetrofitInterface {

@GET
@Streaming
fun downloadFile(@Url url: String): Call<ResponseBody>
}