Google Recaptcha for Android

SafetyNet.getClient(MainActivity.this).verifyWithRecaptcha(SITE_KEY)
.addOnSuccessListener(MainActivity.this,
        new OnSuccessListener<SafetyNetApi.RecaptchaTokenResponse>() {
            @Override
            public void onSuccess(SafetyNetApi.RecaptchaTokenResponse response) {
                // Indicates communication with reCAPTCHA service was
                // successful.
                String userResponseToken = response.getTokenResult();
                Log.e("response", userResponseToken);
                if (!userResponseToken.isEmpty()) {
                    // Validate the user response token using the
                    // reCAPTCHA siteverify API.

                }
            }
        })
.addOnFailureListener(MainActivity.this, new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception e) {
        if (e instanceof ApiException) {
            // An error occurred when communicating with the
            // reCAPTCHA service. Refer to the status code to
            // handle the error appropriately.
            ApiException apiException = (ApiException) e;
            int statusCode = apiException.getStatusCode();
            Log.e(TAG, "Error: " + CommonStatusCodes
                    .getStatusCodeString(statusCode));
        } else {
            // A different, unknown type of error occurred.
            Log.e(TAG, "Error: " + e.getMessage());
        }
    }
});