Theming: delete dialog needs to be Androidx for proper theming.
package de.dennisguse.opentracks.util;
-import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
+import androidx.appcompat.app.AlertDialog;
+
import de.dennisguse.opentracks.R;
/**
