How access shared pref to save new token inside ApiInterceptor

@Override
public Response intercept(Interceptor.Chain chain) throws IOException {
    final Request request = chain.request();
    final Request.Builder builder = request.newBuilder();
    String apiAuthType = request.header(ApiHeader.API_AUTH_TYPE);
    if (apiAuthType == null) {
        apiAuthType = ApiHeader.PROTECTED_API;
    }

    switch (apiAuthType) {
        case ApiHeader.PROTECTED_API:
            builder.addHeader(ApiHeader.HEADER_PARAM_API_KEY, mApiHeader.getmApiKey());
            builder.addHeader(ApiHeader.HEADER_PARAM_AUTHRIZATION, mApiHeader.getmTokenType() + " " + mApiHeader.getmAccessToken());
            builder.addHeader(ApiHeader.HEADER_PARAM_REFRESH_TOKEN, mApiHeader.getmRefreshToken());
        case ApiHeader.PUBLIC_API:
        default:
            builder.addHeader(ApiHeader.HEADER_PARAM_API_KEY, mApiHeader.getmApiKey());
    }

    Response response = chain.proceed(builder.build());
    String newAccessToken = response.header("access_token");
    String newRefreshToken = response.header("refresh_token");
    String newTokenType = response.header("token_type");
    if (newAccessToken != null) {

        **//  I want to save data here**
    }
    return response;
}