question: @ CalledByNative private boolean speak ( int utteranceId , String text , String lang , float rate , float pitch , float volume ) { if ( ! mInitialized ) { mPendingUtterance = new PendingUtterance ( this , utteranceId , text , lang , rate , pitch , volume ) ; return true ; } if ( mPendingUtterance != null ) mPendingUtterance = null ; if ( ! lang . equals ( mCurrentLanguage ) ) { mTextToSpeech . setLanguage ( new Locale ( lang ) ) ; mCurrentLanguage = lang ; } mTextToSpeech . setSpeechRate ( rate ) ; mTextToSpeech . setPitch ( pitch ) ; int result = callSpeak ( text , volume , utteranceId ) ; return ( result == TextToSpeech . SUCCESS ) ; }
target:  Attempt to start speaking an utterance. If it returns true, will call back on start and end.