Trigger TTSEngine's speak() method

TTSFragment.kt

    private fun initializeUI() {
        binding?.apply {
            voiceSpeedSlider.addOnChangeListener { _, value, _ ->
                voiceSpeed = value
                isDefaultSpeedValueExceeded = value > 1f
            }

            maleRadioButton.setOnClickListener {
                isMale = true
                languageRadioGroup.clearCheck()
            }
            femaleRadioButton.setOnClickListener {
                isMale = false
                languageRadioGroup.clearCheck()
            }

            chRadioButton.setOnClickListener {
                languageCode = CHINESE_LANGUAGE_CODE
                showMale()
            }
            enRadioButton.setOnClickListener {
                languageCode = ENGLISH_LANGUAGE_CODE
                showMale()
            }
            frRadioButton.setOnClickListener {
                languageCode = FRENCH_LANGUAGE_CODE
                hideMale()
                toast(NO_MALE_INFO)
            }
          
            // Calling setOnClickListener() for the other radio buttons just like frRadioButton as well

            ttsButton.setOnClickListener {
                if (binding?.ttsFieldEditText?.text?.toString()!!.isEmpty()) toast("Empty TTS text field !!")

                if (languageRadioGroup.checkedRadioButtonId == -1)
                    toast("Select language first")
                else {
                    changeTTSConfiguration(isMale, languageCode, voiceSpeed)

                    if (isDefaultSpeedValueExceeded)
                        toast("You've exceeded default voice speed value(1.0)")

                    speak(binding?.ttsFieldEditText?.text?.toString()!!)
                }
            }

        }
    }