Android Google TTS：为什么 langAvailable returns 不受支持或 -2？

Question

我正在关注 https://developer.xamarin.com/guides/android/platform_features/speech/ 并在 langAvailable 中获取单个值（默认值）。我还更新了 Google TTS 引擎并安装了一些语音数据。我已经安装了其他使用此引擎的应用程序，并且此应用程序具有所有语言。那我做错了什么？ Android OS 6.0

 TextToSpeech textToSpeech = new TextToSpeech(this, this, "com.google.android.tts");
        var langAvailable = new List<string> { "Default" };
        var localesAvailable = Locale.GetAvailableLocales().ToList();

        foreach (var locale in localesAvailable)
        {
            LanguageAvailableResult res = textToSpeech.IsLanguageAvailable(locale);
            switch (res)
            {
                case LanguageAvailableResult.Available:
                    langAvailable.Add(locale.DisplayLanguage);
                    break;
                case LanguageAvailableResult.CountryAvailable:
                    langAvailable.Add(locale.DisplayLanguage);
                    break;
                case LanguageAvailableResult.CountryVarAvailable:
                    langAvailable.Add(locale.DisplayLanguage);
                    break;
            }
        }
        langAvailable = langAvailable.OrderBy(t => t).Distinct().ToList();

Answer 1

Android Google TTS: Why langAvailable returns Not supported or -2?

似乎 Google TTS 需要一点初始化，当 TTS 引擎正确初始化后，您应该使用 IsLanguageAvailable() 方法。

例如：

void TextToSpeech.IOnInitListener.OnInit(OperationResult status)
    {
        // if we get an error, default to the default language
        if (status == OperationResult.Error)
            textToSpeech.SetLanguage(Java.Util.Locale.Default);
        // if the listener is ok, set the lang
        if (status == OperationResult.Success)
        {
            langAvailable = new List<string> { "Default" };
            localesAvailable = Java.Util.Locale.GetAvailableLocales().ToList();

            foreach (var locale in localesAvailable)
            {
                LanguageAvailableResult res = textToSpeech.IsLanguageAvailable(locale);

                switch (res)
                {
                    case LanguageAvailableResult.Available:
                        langAvailable.Add(locale.DisplayLanguage);
                        break;
                    case LanguageAvailableResult.CountryAvailable:
                        langAvailable.Add(locale.DisplayLanguage);
                        break;
                    case LanguageAvailableResult.CountryVarAvailable:
                        langAvailable.Add(locale.DisplayLanguage);
                        break;
                }
            }

            langAvailable = langAvailable.OrderBy(t => t).Distinct().ToList();

            var adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleSpinnerDropDownItem, langAvailable);
            spinLanguages.Adapter = adapter;

            textToSpeech.SetLanguage(lang);
        }
    }

然后，当您 select 来自 Spinner 的语言时：

spinLanguages.ItemSelected += (object sender, AdapterView.ItemSelectedEventArgs e) =>
{
     lang = Java.Util.Locale.GetAvailableLocales().FirstOrDefault(t => t.DisplayLanguage == langAvailable[(int)e.Id]);
     textToSpeech.SetLanguage(lang);
};

Effect.

Android Google TTS：为什么 langAvailable returns 不受支持或 -2？

Android Google TTS: Why langAvailable returns Not supported or -2?

c#

android

xamarin.android

google-text-to-speech