Question

In my application’s main activity I issue an Intent with ACTION_CHECK_TTS_DATA:

Intent intent = new Intent();
intent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
startActivityForResult(intent, 0);    

When it returns, in onActivityResult(), I try to list the available voices:

protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  if (requestCode == 0) {
    if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {
        String availableVoices = intent.getStringExtra(TextToSpeech.Engine.EXTRA_AVAILABLE_VOICES);
        Log.d("TTS engine installed", "Available voices: " + availableVoices);
        new TextToSpeech(this, this);
    }
  }
}

I am receiving CHECK_VOICE_DATA_PASS and everything works fine but according to the Log.d() message, intent.getStringExtra(TextToSpeech.Engine.EXTRA_AVAILABLE_VOICES) returns null!

I know that there are quite a few voices in my phone, installed and working properly, so why does getStringExtra(TextToSpeech.Engine.EXTRA_AVAILABLE_VOICES) return null?

What am I missing?

Answer 1

You are fetching the EXTRA_AVAILABLE_VOICES list using getStringExtra() instead of getStringArrayListExtra().

See this answer for more details.