[英]Xamarin.Forms TextToSpeech
我正在尝试开发一个带有SpeechToText功能的移动应用程序,我在这里找到了一个示例Original Post ,我试图按照它的步骤,但是当我运行应用程序并点击按钮进行录制时,我收到一条消息说“未处理的异常发生,方法上没有正文..“ 我试着调试和我所得到的是它的东西有关DependecyService
运行SpeechToTextAsync
从方法ISpeecehToText
接口。 现在我不太使用接口,所以我有点卡住了解导致此错误的原因以及如何解决它。
namespace LiveScoring {
public partial class MainPage : ContentPage {
public MainPage() {
InitializeComponent();
}
public void RecordBtn_Clicked(object sender, EventArgs e) {
WaitForSpeechToText();
}
private async void WaitForSpeechToText() {
Output_lbl.Text = await DependencyService.Get<ISpeechToText>().SpeechToTextAsync();
>> here I get the error
}
}
}
using System.Threading.Tasks;
namespace LiveScoring {
public interface ISpeechToText {
Task<string> SpeechToTextAsync();
}
}
namespace LiveScoring.Droid {
public class SpeechToText : ISpeechToText {
private const int VOICE = 10;
public static string SpeechText;
public static AutoResetEvent autoEvent = new AutoResetEvent(false);
public SpeechToText() { }
public async Task<string> SpeechToTextAsync() {
var tcs = new TaskCompletionSource<string>();
try {
var voiceIntent = new Intent(RecognizerIntent.ActionRecognizeSpeech);
voiceIntent.PutExtra(RecognizerIntent.ExtraLanguageModel, RecognizerIntent.LanguageModelFreeForm);
voiceIntent.PutExtra(RecognizerIntent.ExtraPrompt, "Talk now");
voiceIntent.PutExtra(RecognizerIntent.ExtraSpeechInputCompleteSilenceLengthMillis, 1500);
voiceIntent.PutExtra(RecognizerIntent.ExtraSpeechInputPossiblyCompleteSilenceLengthMillis, 1500);
voiceIntent.PutExtra(RecognizerIntent.ExtraSpeechInputMinimumLengthMillis, 15000);
voiceIntent.PutExtra(RecognizerIntent.ExtraMaxResults, 1);
voiceIntent.PutExtra(RecognizerIntent.ExtraLanguage, Java.Util.Locale.Default);
SpeechText = "";
autoEvent.Reset();
try {
((Activity)Forms.Context).StartActivityForResult(voiceIntent, VOICE);
} catch (ActivityNotFoundException a) {
tcs.SetResult("Device doesn't support speech to text");
}
await Task.Run(() => { autoEvent.WaitOne(new TimeSpan(0, 2, 0)); });
return SpeechText;
} catch (Exception ex) {
tcs.SetException(ex);
}
return "";
}
}
}
尝试将其添加到namespace LiveScoring.Droid {
line,即:
[assembly: Dependency(typeof(SpeechToText))]
namespace LiveScoring.Droid {
...
}
这样它将注册依赖服务,因此当您使用DependencyService.Get<>()
方法时将调用它。
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