Android 获取SHA1

	 public static String sHA1(Context context){
        try {
            @SuppressLint("PackageManagerGetSignatures")
            PackageInfo info = context.getPackageManager().getPackageInfo(
                    context.getPackageName(), PackageManager.GET_SIGNATURES);
            byte[] cert = info.signatures[0].toByteArray();
            MessageDigest md = MessageDigest.getInstance("SHA1");
            byte[] publicKey = md.digest(cert);
            StringBuilder hexString = new StringBuilder();
            for (byte b : publicKey) {
                String appendString = Integer.toHexString(0xFF & b)
                        .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 (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }