Generate Hash Key

MainActivity.java

    public void generateHashkey(){
        try {
            PackageInfo info = getPackageManager().getPackageInfo(
                    "YOUR_PACKAGE_NAME",
                    PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());

                Log.d(Constants.TAG, "HASH BELOW");
                Log.d(Constants.TAG, Base64.encodeToString(md.digest(),
                        Base64.NO_WRAP));
            }
        } catch (PackageManager.NameNotFoundException e) {
            Log.d(Constants.TAG, e.getMessage(), e);
        } catch (NoSuchAlgorithmException e) {
            Log.d(Constants.TAG, e.getMessage(), e);
        }
    }