public void showLayerImmediately(int index) {
    mIsLayerOn[index] = true;
    mAlphas[index] = 255;
    if (index == mActualImageLayer) {
      mOnFadeListenerShowImmediately = true;
    }
    invalidateSelf();
  }
Makes the specified layer fully opaque

@param index the index of the layer to be shown
drawee/src/main/java/com/facebook/drawee/drawable/FadeDrawable.java