Replace refresh PNGs with a vector drawable.

app/src/main/java/org/fdroid/fdroid/UpdateService.java

@@ -34,13 +34,14 @@ import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Process;
 import android.os.SystemClock;
+import android.text.TextUtils;
+import android.util.Log;
+import android.widget.Toast;
+
 import androidx.annotation.NonNull;
 import androidx.core.app.JobIntentService;
 import androidx.core.app.NotificationCompat;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
-import android.text.TextUtils;
-import android.util.Log;
-import android.widget.Toast;
 
 import org.fdroid.fdroid.data.Apk;
 import org.fdroid.fdroid.data.ApkProvider;
@@ -259,7 +260,7 @@ public class UpdateService extends JobIntentService {
         notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 
         notificationBuilder = new NotificationCompat.Builder(this, NotificationHelper.CHANNEL_UPDATES)
-                .setSmallIcon(R.drawable.ic_refresh_white)
+                .setSmallIcon(R.drawable.ic_refresh)
                 .setOngoing(true)
                 .setCategory(NotificationCompat.CATEGORY_SERVICE)
                 .setContentTitle(getString(R.string.update_notification_title));

app/src/main/res/drawable/ic_refresh.xml

@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FFFFFF" android:pathData="M17.65,6.35C16.2,4.9 14.21,4 12,4c-4.42,0 -7.99,3.58 -7.99,8s3.57,8 7.99,8c3.73,0 6.84,-2.55 7.73,-6h-2.08c-0.82,2.33 -3.04,4 -5.65,4 -3.31,0 -6,-2.69 -6,-6s2.69,-6 6,-6c1.66,0 3.14,0.69 4.22,1.78L13,11h7V4l-2.35,2.35z"/>
+</vector>