code: private void obtainActivatedColor(@NonNull final TypedArray typedArray) {
          int defaultActivatedColor = getControlActivatedColor();
          activatedColor = typedArray
                  .getColor(R.styleable.FloatingActionButton_activatedColor, defaultActivatedColor);
      }
docs: Obtains the floating action button's activated color from a specific typed array.
  
  @param typedArray
  The typed array, the activated color should be obtained from, as an instance of the
  class {@link TypedArray}. The typed array may not be null