android custom button style code example
Example 1: button style android studio
style="@style/Widget.AppCompat.Button"
style="@style/Widget.AppCompat.Button.Colored"
style="@style/Widget.AppCompat.Button.Borderless"
style="@style/Widget.AppCompat.Button.Borderless.Colored"
Example 2: design custom button in android
android:background="@drawable/button_shape"