Icon in Android

General
1

Hello community
A question
Are there only six dimensions for the Android devices?

        "LDPI": "Icon-ldpi.png",
        "MDPI": "Icon-mdpi.png",
        "HDPI": "Icon-hdpi.png",
        "XHDPI": "Icon-xhdpi.png",
        "XXHDPI": "Icon-xxhdpi.png",
        "XXXHDPI": "Icon-xxxhdpi.png"

Because in some cell phones does not show me the icon

for example.
SAMSUNG SM-A5 Android 6.0.1

Or what would be my problem?

thanks and regards.