library/src/main/java/com/github/clans/fab/FloatingActionButton.java
public void setShadowXOffset(int dimenResId) {
        int shadowXOffset = getResources().getDimensionPixelSize(dimenResId);
        if (mShadowXOffset != shadowXOffset) {
            mShadowXOffset = shadowXOffset;
            requestLayout();
            updateBackground();
        }
    }
public void setShadowXOffset(int dimenResId) {
        int shadowXOffset = getResources().getDimensionPixelSize(dimenResId);
        if (mShadowXOffset != shadowXOffset) {
            mShadowXOffset = shadowXOffset;
            requestLayout();
            updateBackground();
        }
    }
Sets the shadow x offset of the <b>FloatingActionButton</b> and invalidates its layout.

@param dimenResId the resource identifier of the dimension