android文本到Toast消息的语音

Question

我在android studio中将文本转换为语音时出错。我已经初始化了代码，但它仍然没有返回语音输出。代码如下。

    else if((match.contains("yes") || match.contains("yeah")) && defsele) {
            //Toast toast = Toast.makeText(getApplicationContext(), "Default selection is done and program is starting", Toast.LENGTH_SHORT);
            //toast.show();
            defsele=false;
            switch (progno) {
                case 1:
                    //Toast toast1 = Toast.makeText(getApplicationContext(),"The default settings for cotton cycle is done",Toast.LENGTH_SHORT);
                    //toast1.show();
                    String cotton = "The cotton program is starting with the default values";
                    tts.speak(cotton, TextToSpeech.QUEUE_FLUSH, null);
                    soak=true;
                    soakdef();
                    break;

tts.speak被删除并且不起作用。我该如何工作。初始化代码如下

    tts = new TextToSpeech(this,this);
  @Override
public void onInit(int status) {
    Log.d("Speech", "OnInit - Status ["+status+"]");
    if(status == TextToSpeech.SUCCESS){
        Log.d("Speech","Success");
        tts.setLanguage(Locale.ENGLISH);

我对Android编程非常陌生，非常感谢任何帮助。

先谢谢!!!