code: @NonNull
      public Crossfade setFadeBehavior(int fadeBehavior) {
          if (fadeBehavior >= FADE_BEHAVIOR_CROSSFADE && fadeBehavior <= FADE_BEHAVIOR_OUT_IN) {
              mFadeBehavior = fadeBehavior;
          }
          return this;
      }
docs: Sets the type of fading animation that will be run, one of
  {@link #FADE_BEHAVIOR_CROSSFADE} and {@link #FADE_BEHAVIOR_REVEAL}.
  
  @param fadeBehavior The type of fading animation to use when this
  transition is run.