App shows black screen when minimized and reopened on Tecno android phones

[Chibuike Mba]

Hi everyone, my app is showing black screen when minimized and reopened on Tecno android phone with custom OS (HiOS) but works well on other brands we have tested on.

Main class:

package com.xdplax.playsafe;

import com.codename1.notifications.LocalNotificationCallback;
import com.codename1.ui.Display;
import com.codename1.ui.Form;
import com.codename1.ui.Dialog;
import com.codename1.ui.FontImage;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
import com.codename1.ui.plaf.DefaultLookAndFeel;
import com.codename1.ui.plaf.Style;
import com.xdplax.playsafe.model.Reminder;
import com.xdplax.playsafe.model.Settings;
import com.xdplax.playsafe.ui.HomeScreen;

/**
 *
 * @author CHiBEX
 */
public class PlaySafe implements LocalNotificationCallback {

    private Form current;
    private Resources theme;

    public void init(Object context) {
        theme = UIManager.initFirstTheme("/theme");
       
        new Reminder().getPropertyIndex().registerExternalizable();
        new Settings().getPropertyIndex().registerExternalizable();
       
        Style s = new Style();
        s.setFgColor(0xe91e63);
        s.setBgTransparency(0);
        ((DefaultLookAndFeel) UIManager.getInstance().getLookAndFeel()).
                setComboBoxImage(FontImage.createMaterial(FontImage.MATERIAL_ARROW_DROP_DOWN, s, 5F));
    }
   
    public void start() {
        if(current != null){
            current.show();
            current.forceRevalidate();
            return;
        }
        HomeScreen homeScreen = new HomeScreen();
        homeScreen.show();
    }

    public void stop() {
        current = Display.getInstance().getCurrent();
        if(current instanceof Dialog) {
            ((Dialog)current).dispose();
            current = Display.getInstance().getCurrent();
        }
    }
   
    public void destroy() {
    }
   
    @Override
    public void localNotificationReceived(String notificationId) {
        theme = UIManager.initFirstTheme("/theme");
       
        Dialog.show("Noti", notificationId, "OK", null);
        System.out.println("Received local notification "+notificationId);
    }
}

One of the attached screenshots shows the app in good condition while the other shows the black screen.


Please your assistance is highly appreciated.

[Shai Almog]

Hi,
usually when that happens it means there was an exception somewhere. Please connect the device with a cable to logcat/ddms and reproduce the issue. See if there is an exception stack you can provide.