Android代码获取sha1

    public static String getSHA1(Context context) {        try {            PackageInfo info = context.getPackageManager().getPackageInfo(context.getPackageName()                    , PackageManager.GET_SIGNATURES);            byte[] cert = info.signatures[0].toByteArray();            MessageDigest md = MessageDigest.getInstance("SHA1");            byte[] signatures = md.digest(cert);            StringBuffer sha1 = new StringBuffer();            int i = 0;            for (byte key : signatures) {                String appendString = Integer.toHexString(0xFF & key).toUpperCase(Locale.US);                if (appendString.length() == 1)                    sha1.append("0");                sha1.append(appendString);                if (signatures.length - 1 == i)                    break;                sha1.append(":");                i++;            }            return sha1.toString();        }        catch (Exception e) {            e.printStackTrace();        }        return null;    }