Android Studio获取SHA1和MD5

1、通过代码获取SHA1：

 public static String getSHA1(Context context) {
        try {
            PackageManager pm = context.getPackageManager();// 获取包管理器
            String packageName = context.getPackageName(); //获取包名
            PackageInfo info = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
            byte[] cert = info.signatures[0].toByteArray();
            MessageDigest md = MessageDigest.getInstance("SHA1");
            byte[] publicKey = md.digest(cert);
            StringBuffer hexString = new StringBuffer();
            for (int i = 0; i < publicKey.length; i++) {
                String appendString = Integer.toHexString(0xFF & publicKey[i]).toUpperCase(Locale.US);
                if (appendString.length() == 1) {
                    hexString.append("0");
                }
                hexString.append(appendString);
                hexString.append(":");
            }
            String result = hexString.toString();
            return result.substring(0, result.length() - 1);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

 

2、通过代码获取MD5：

public static String getMD5(Context context) {
        try {
            PackageManager pm = context.getPackageManager();// 获取包管理器
            String packageName = context.getPackageName(); //获取包名
            PackageInfo packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
            Signature[] signatures = packageInfo.signatures;// 签名信息
            byte[] signatureByte = signatures[0].toByteArray();
            ByteArrayInputStream inputStream = new ByteArrayInputStream(signatureByte);// 将签名转换为字节数组流
            CertificateFactory certFactory = CertificateFactory.getInstance("X.509");// 证书工厂类，这个类实现了出厂合格证算法的功能
            X509Certificate cert = (X509Certificate) certFactory.generateCertificate(inputStream);// X509证书，X.509是一种非常通用的证书格式
            MessageDigest md = MessageDigest.getInstance("MD5");// MD5加密算法
            byte[] publicKey = md.digest(cert.getEncoded());//获得公钥
            StringBuilder str = new StringBuilder(publicKey.length * 2);
            for (int i = 0; i < publicKey.length; i++) {
                String h = Integer.toHexString(publicKey[i]);
                int l = h.length();
                if (l == 1)
                    h = "0" + h;
                if (l > 2)
                    h = h.substring(l - 2, l);
                str.append(h.toUpperCase());
                if (i < (publicKey.length - 1))
                    str.append(':');
            }
            return str.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }