如何在应用程序 class 中启动 TextToSpeech，然后使用 Kotlin 在 android 的另一个活动中使用它？

Question

我正在开发一个在其中一项活动中使用 TextToSpeech 的锻炼应用程序。 但问题是 TextToSpeech 需要很长时间才能开始，所以它完全错过了一个练习，然后它就完美地工作了。 我试图在互联网上寻找解决方案，发现在应用程序 class 中初始化 TextToSpeech 将在应用程序启动时加载到 TextToSpeech，然后它可能工作正常。 问题是我不知道如何在应用程序 class 中初始化 TextToSpeech，然后在我需要它的活动中使用它。我在整个互联网上搜索了这个并没有找到解决方案。 请帮我解决这个问题，我被卡住了。

谢谢你！

这是我使用文本到语音的活动的代码

package khan.sajad.example.letsworkout

import android.content.Intent
import android.os.Bundle
import android.os.CountDownTimer
import android.speech.tts.TextToSpeech
import android.util.Log
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import com.bumptech.glide.Glide
import khan.sajad.example.letsworkout.data.Exercises
import khan.sajad.example.letsworkout.databinding.ActivityExerciseBinding
import java.util.*

class ExerciseActivity : AppCompatActivity(), TextToSpeech.OnInitListener {
   private lateinit var binding: ActivityExerciseBinding
   private var position = 0
   private var exerciseList = Exercises().loadExercises()

   // Text To speech variable
   private lateinit var textToSpeech: TextToSpeech

   override fun onCreate(savedInstanceState: Bundle?) {
       super.onCreate(savedInstanceState)
       binding = ActivityExerciseBinding.inflate(layoutInflater)
       setContentView(binding.root)
       setSupportActionBar(binding.exerciseToolbar)
       // enables back button on toolbar
       supportActionBar?.setDisplayHomeAsUpEnabled(true)
       // click-listener to the back button on the toolbar
       binding.exerciseToolbar.setNavigationOnClickListener {
           position = 0
           onBackPressed()
           finish()
       }

       // Starting Text To Speech
       textToSpeech = TextToSpeech(this, this)

       startTimer()
   }

   private fun startTimer(){
       binding.tvTitle.text = getString(R.string.get_ready, exerciseList[position].name)

       // Speak out
       textToSpeech.speak(binding.tvTitle.text, TextToSpeech.QUEUE_FLUSH, null, "")
       
       object : CountDownTimer(10000, 1000) {
           override fun onTick(millisUntilFinished: Long) {
               binding.tvTimer.text = (millisUntilFinished / 1000).toString()
               binding.progressBar.progress = ((millisUntilFinished)/1000).toInt()
           }

           override fun onFinish() {

               setExerciseVisibility()
               startTimer30()
           }
       }.start()
   }

   private fun startTimer30(){
           val exercise = exerciseList[position]
           binding.tvTitle30.text = exercise.name
           showGif(exercise.image)
           object : CountDownTimer(30000, 1000) {
           override fun onTick(millisUntilFinished: Long) {
               binding.tvTimer30.text = (millisUntilFinished / 1000).toString()
               binding.progressBar30.progress = ((millisUntilFinished)/1000).toInt()
           }

           override fun onFinish() {
               position++
               if(position != exerciseList.size){
                   setBreakVisibility()
                   startTimer()
               }
               else{
                   setResultActivity()
               }
           }
       }.start()
   }

   private fun showGif(id: Int) {
       Glide.with(this).load(id).into(binding.ImageView30)
   }
   private fun setExerciseVisibility(){
       binding.frameLayout.visibility = View.GONE
       binding.tvTitle.visibility = View.GONE
       binding.frameLayout30.visibility = View.VISIBLE
       binding.tvTitle30.visibility = View.VISIBLE
       binding.ImageView30.visibility = View.VISIBLE
   }

   private fun setBreakVisibility(){
       binding.frameLayout30.visibility = View.GONE
       binding.tvTitle30.visibility = View.GONE
       binding.ImageView30.visibility = View.GONE
       binding.frameLayout.visibility = View.VISIBLE
       binding.tvTitle.visibility = View.VISIBLE
   }
   private fun setResultActivity(){
       val intent = Intent(this, ResultActivity::class.java)
       startActivity(intent)
       finish()
   }


   // OnIt for text to speech
   override fun onInit(status: Int) {
       if(status == TextToSpeech.SUCCESS){
           val langSet = textToSpeech.setLanguage(Locale.ENGLISH)
           if(langSet == TextToSpeech.LANG_MISSING_DATA || langSet == TextToSpeech.LANG_NOT_SUPPORTED){
               Log.e("TTS", "Unable set the language!")
           }
       }
       else{
           Log.e("TTS", "Failed to start Text to speech")
       }
   }

Answer 1

Inside your application onCreate()

val textToSpeech = TextToSpeech(getApplicationContext(), this) 

and then implement onInit(status: Int) method.

also create a public function.

fun getTTSPlayer(){
    return textToSpeech;
}

在您的活动中，使用您的应用程序实例调用 getTTsPlayer。