I created a android app apk and tried it on 3 android phones:
- Galaxy S4 (Android 5.0.1)
- ZTE Avid Plus (Android 5.1.1)
- Huawei Mate 9 (Android 8.0, Oreo)
the app icon on the first two devices shows what I expected: a customized graphical icon; however the app icon shows a default robot icon on Huawei Mate 9.
I did search through this site and I found these relevant posts:
- default robot icon instead of app icon after installation
- Android app shows default android icon in some devices
I tried to follow the instructions there but it still failed.
BTW, I noticed some apps also show default icon occasionally on Huawei Mate 9, apps such as reddit and whatsApp.