Use AWS SDK

For advanced use cases where Amplify does not provide the functionality you're looking for, you can retrieve the escape hatch to access the underlying SDK.

The escape hatch provides access to the underlying AWSMobileClient instance.

1AWSMobileClient mobileClient = (AWSMobileClient) Amplify.Auth.getPlugin("awsCognitoAuthPlugin").getEscapeHatch();

You can use the escape hatch to federatedSignIn with a valid token from other social providers. Find more details here

1mobileClient.federatedSignIn(IdentityProvider.FACEBOOK.toString(), "<FACEBOOK_TOKEN_HERE>", new Callback<UserStateDetails>() {
2    @Override
3    public void onResult(final UserStateDetails userStateDetails) {
4        //Handle the result
5    }
6
7    @Override
8    public void onError(Exception e) {
9        Log.e(TAG, "sign-in error", e);
10    }
11});