To configure appearance and behavior of the record button just use recordButtonStyle attribute of the main theme with the following parameters:
recordButtonRecordingSize - for the size of recording button
recordButtonInnerIdleDrawable - for the drawable inside record button shown during idle state
recordButtonInnerRecordingDrawable - for the drawable inside record button shown during recording
recordButtonElevation - elevation of the record button
recordButtonInnerRecordingSize - size of the drawable shown during recording
recordButtonCircleIdleWidth - width of the record button circle during idle state
recordButtonCircleRecordingWidth - width of the record button circle during recording
recordButtonCircleGradientColors - array for the gradient colors that fill the record button circle during recording
recordButtonCircleSolidColor - color of the record button circle
recordButtonAnimationPhotoScale - array with two integers where the first is an initial scale and the second is a final scale during animation (these values should be multiplier of 1000: for example, for 1.0 use 1000)
recordButtonAnimationVideoInnerScale - array with two integers where the first is an initial scale of the inner drawable of record button and the second is a final scale during animation (these values should be multiplier of 1000: for example, for 1.0 use 1000)
recordButtonAnimationVideoOuterScale - array with two integers where the first is an initial scale of the outer circle of record button and the second is a final scale during animation (these values should be multiplier of 1000: for example, for 1.0 use 1000)
recordButtonAnimationDuration - duration for all animations of the record button
