ScanActivity.java 文件源码

private void setScanBtnBg(){
    int defColor = CustomAttrValueUtil.getAttrColorValue(R.attr.colorAccent,R.color.colorAccent,this);
    int pressColor = CustomAttrValueUtil.getAttrColorValue(R.attr.press_color,R.color.colorAccent,this);
    Drawable backgroundDrawable =  scanBtn.getBackground();
    StateListDrawable sld = (StateListDrawable) backgroundDrawable;// 通过向下转型，转回原型，selector对应的Java类为：StateListDrawable
    SelectorUtil.changeViewColor(sld,new int[]{pressColor,defColor});
}