FloatMath library unavailable in API 23 and later

We did upgrade all our Android application and libraries to use Java 8 and API v25. The CustomViewAbove class uses a deprecated library FloatMath since API v23.

The Android documentation suggest to use the library Math instead of FloatMath. We did correct this is our codebase. Along with the Gradle file to compile with Java 8 and use the latest API.

With that changes, the CustomViewAbove cannot be compiled. I suggest to use the Math library instead of the FloatMath library to support latest Android tools.

The exact line is CustomViewAbove line 303