FABLayout.java 文件源码

@Keep
public void setFabBackgroundColor(int color) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        ColorStateList colorStateList = ColorStateList.valueOf(color);
        for (int i = 0; i < getChildCount(); i++) {
            View view = getChildAt(i);
            if (view instanceof FloatingActionButton)
                view.setBackgroundTintList(colorStateList);
        }
    }
}