Radar animation in button using: ripplebackground library of https://github.com/skyfishjy
To change the animation:
app:rb_color [color def:@android:color/holo_blue_dark] --> Color of the ripple
app:rb_radius [dimension def:64dp ] --> Radius of the ripple
app:rb_duration [integer def:3000 ] --> Duration of one ripple animation (millisecond)
app:rb_rippleAmount [integer def:6] --> Max amount of ripples at one screen
app:rb_scale [interger def:6] --> Scale of ripple at the end of one animation cycle
app:rb_type [enum (fillRipple, strokeRipple) def:fillRipple] --> Filled circle or ring
app:rb_strokeWidth [dimension def:2dp] --> Stroke width of the ripple, ONLY work when rb_type="strokeRipple"
Thanks to Skyfishjy!
Icons made by Freepik from www.flaticon.com