Anyone know why my project xml become like this?

# android

[Arief Hidayat]

Anyone know why my project xml become like this?

[orafaaraujo]

I’m not sure, but probably because it’s an activity file
you need to use selector inside res/drawable

[Sulav Timsina]

Why are u adding selector in activity_main.xml ? Use it inside res/drawable or res/color