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I've been using DownloadManager in a production app without problems but now it fails in Android Pie (API 28). Please note that the download is marked as failed and returns error 400.

@Override

public void onReceive(Context context, Intent intent) {

    long reference = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);

    DownloadManager.Query query = new DownloadManager.Query();

    query.setFilterById(reference);

    DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);

    Cursor cursor = downloadManager.query(query);

    cursor.moveToFirst();

    int statusIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);

    int status = cursor.getInt(statusIndex);



    if (status == DownloadManager.STATUS_SUCCESSFUL) {

        int fileUriIndex = cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI);

        String savedFileUri = cursor.getString(fileUriIndex);



        ParcelFileDescriptor pfd = null;

        try {

            pfd = context.getContentResolver().openFileDescriptor(Uri.parse(savedFileUri), "r");

            PamplonaParkingXMLParser pamplonaParkingXMLParser = new PamplonaParkingXMLParser();

            ParkingList parkingList = pamplonaParkingXMLParser.parse(pfd);

            ObservableObject.getInstance().updateValue(parkingList);

            if (pfd != null) {

                pfd.close();

            }

        } catch (XmlPullParserException e) {

            Log.e(TAG, e.getDetail().getLocalizedMessage());

        } catch (IOException | NullPointerException e) {

            Log.e(TAG, e.getLocalizedMessage());

        }

    } else if(status == DownloadManager.STATUS_FAILED){

        Log.e(TAG, "Download failed");

        int reasonIndex = cursor.getColumnIndex(DownloadManager.COLUMN_REASON);

        int reason = cursor.getInt(reasonIndex);

        Log.e(TAG, reason +"");

    }

}

Try these solutions

Solution 1)

Add this line in application tag in manifest file

android:usesCleartextTraffic="true"

like below

<application

            android:name=".ApplicationClass"

            android:usesCleartextTraffic="true"

            android:networkSecurityConfig="@xml/network_security_config"

            android:supportsRtl="true"

            android:theme="@style/AppTheme">

Add this tag in application tag in manifest file

Solution 2)

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

<application

        android:name=".ApplicationClass"

        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
For more info refer my answer
Files are not downloading on Android Pie 9.0 (Xiaomi mi A2) Using Download Manger