Speech to text and text to speech in Unity iOS and Unity Android

I have provided all Java and Object-C source. You can learn how it works and add optimizations or new features.

• SpeechToText Android: https://developer.android.com/reference/android/speech/package-summary.html
• TextToSpeech Android: https://developer.android.com/reference/android/speech/tts/TextToSpeech.html
• SpeechToText iOS: https://developer.apple.com/reference/speech
• TextToSpeech iOS: https://developer.apple.com/reference/avfoundation

• To hide the default Android popup, there's a bool to enable and disable it, if you don't want the popup to show up.

class SpeechToText
{
 public bool isShowPopupAndroid = false;
 ...

• Merge file AndroidManifest (If you want skip the default popup)

• Requires Xcode8 or higher. Target iOS 10.0.

• Add frameworks

  - speech.farmwork
  - AVFoundation.framework
  

• Add permissions

  - Privacy – Microphone Usage Description 
  - Privacy – Speech Recognition Usage Description