AuthManager.getInstance().login(this, new AuthManager.LoginCallback() {
    @Override
    public void onSuccess() {
        // User successfully logged in, get him to the Home screen or something...
    }

    @Override
    public void onError(InstagramAuthException e) {
        if (e instanceof InstagramAuthAccessDeniedException) {
            // User denied access, do something...
        }

        if (e instanceof InstagramAuthNetworkOperationException) {
            // Network problem, do something...
        }
    }
});

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    AuthManager.getInstance().onActivityResult(requestCode, resultCode, data);
}

AuthManager.getInstance().getUserInfoAsync(new AuthManager.Callback<UserInfo>() {
    @Override
    public void onSuccess(UserInfo userInfo) {
        String id = userInfo.getId();
        String userName = userInfo.getUserName();
        String fullName = userInfo.getFullName();
        String photoUrl = userInfo.getPhotoUrl();

        . . .
    }

    @Override
    public void onError(InstagramAuthException e) {
        if (e instanceof InstagramAuthTokenException) {
            // Instagram expires the token after some period of time,
            // so we need to re-authenticate the User. When this happens,
            // library is automatically logging User out, i.e. the old token is removed
            // and AuthManager.getInstance().isLoggedIn() returns false.
            //
            // Prompt the User to log in again.
        }

        if (e instanceof InstagramAuthNetworkOperationException) {
            // Network problem, do something...
        }
    }
});