public final UnaryCallable<ListVoicesRequest, ListVoicesResponse> listVoicesCallable() {
    return stub.listVoicesCallable();
  }
Returns a list of Voice supported for synthesis.

<p>Sample code:

<pre>{@code
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
try (TextToSpeechClient textToSpeechClient = TextToSpeechClient.create()) {
  ListVoicesRequest request =
      ListVoicesRequest.newBuilder().setLanguageCode("languageCode-2092349083").build();
  ApiFuture<ListVoicesResponse> future =
      textToSpeechClient.listVoicesCallable().futureCall(request);
  // Do something.
  ListVoicesResponse response = future.get();
}
}</pre>
java-texttospeech/google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1/TextToSpeechClient.java