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SpeechToTextButton Language Support in .NET MAUI
Updated on Sep 5, 2025
Environment
| Control | Author |
|---|---|
| SpeechToTextButton for .NET MAUI | Dobrinka Yordanova |
Description
This article explains how to check the supported languages for the SpeechToTextButton in .NET MAUI and how to set them.
Solution
Here is an example of how to check the supported languages for the SpeechToTextButton in .NET MAUI. For the demo, use:
- An Editor for displaying the recognized text.
- An Entry for setting the language.
- A Label for displaying whether the language is supported or not.
1. Define the RadSpeechToTextButton control in XAML:
XAML
<Grid RowDefinitions="Auto, *, 4*">
<Grid ColumnDefinitions="*, *">
<Entry x:Name="entryLanguage" TextChanged="EntryLanguage_TextChanged" Placeholder="en-US" />
<Label x:Name="label1" Grid.Column="1" />
</Grid>
<Editor x:Name="editor" Grid.Row="1" />
<telerik:RadSpeechToTextButton x:Name="speechToTextButton"
SpeechRecognized="SpeechToTextButton_SpeechRecognized"
Grid.Row="2"
HorizontalOptions="End"
VerticalOptions="End"
Margin="{OnPlatform Default=0, MacCatalyst='0, 0, 20, 20'}" />
</Grid>2. In the code-behind, handle the TextChanged event of the Entry to check if the entered language is supported:
C#
private void EntryLanguage_TextChanged(object sender, Microsoft.Maui.Controls.TextChangedEventArgs e)
{
bool isSupported = IsLanguageSupported(e.NewTextValue);
this.label1.Text = isSupported ? "supported" : "not supported";
if (isSupported)
{
this.label1.Text = "supported";
this.speechToTextButton.LanguageTag = e.NewTextValue;
}
else
{
this.label1.Text = "not supported";
}
}
private static bool IsLanguageSupported(string languageTag)
{
try
{
#if ANDROID
// There is no programmatic way to check if a language is supported on Android, but most languages are.
// For a complete list, see: https://cloud.google.com/speech-to-text/docs/speech-to-text-supported-languages
return true;
#elif IOS
var locale = Foundation.NSLocale.FromLocaleIdentifier(languageTag);
var localSpeechRecognizer = new Speech.SFSpeechRecognizer(locale);
localSpeechRecognizer.Dispose();
#elif WINDOWS
var language = new global::Windows.Globalization.Language(languageTag);
var localSpeechRecognizer = new global::Windows.Media.SpeechRecognition.SpeechRecognizer(language);
localSpeechRecognizer.Dispose();
#endif
return true;
}
catch
{
return false;
}
}3. Handle the SpeechToTextButton's SpeechRecognized event to display the recognized text in the Editor:
C#
private void SpeechToTextButton_SpeechRecognized(object sender, SpeechRecognizerSpeechRecognizedEventArgs args)
{
this.editor.Text = args.FullText;
}