49.9 Time Linearity
In the absence of any additional settings, the animations outlined above will be performed at a constant speed. To vary the speed of an animation (for example so that it accelerates and the decelerates) the transition easing attribute (transitionEasing) can be used either within a ConstraintSet or Keyframe.
For complex easing requirements, the linearity can be defined by plotting points on a cubic Bézier curve, for example:
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motion:layout_constraintBottom_toBottomOf="parent"
motion:transitionEasing="cubic(0.2, 0.7, 0.3, 1)"
android:rotation="360">
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If you are unfamiliar with Bézier curves, consider using the curve generator online at the following URL:
