android 判断2次安装apk签名是否相同工具类

  public static boolean hasSameSignature(List sig1, List sig2) {

        if(sig1 != null && sig2 != null) {

            if(sig1.size() != sig2.size()) {

                return false;

            } else {

                Set set=new HashSet(sig1);

                set.addAll(sig2);

                if(set.size() != sig1.size()) {

                    return false;

                }

                return true;

            }

        } else if(sig1 == null && sig2 == null) {

            return true;

        } else {

            return false;

        }

    }