Android 在活动开始时播放文本以进行对话

我希望我的申请说一句你好，如果你的情况是紧急呼叫911时，活动开始，但我不能这样做

我使用了以下代码：

public class home extends AppCompatActivity  implements TextToSpeech.OnInitListener {
    Button Signin , listButton,Speak;
    EditText Text;
    Button mSpeak;
    private TextToSpeech mTTS;
    protected static final int RESULT_SPEECH = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

      //  TTS 
        mTTS = new TextToSpeech(this, this);
        mSpeak =  (Button) findViewById(R.id.mSpeak);
        mSpeak.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                speak("Hello, If Your Case Is Emergency CALL 911 , IF not Continue");
            }
        });

        speak("Hello, If Your Case Is Emergency CALL 911 , IF not Continue");
    }


    public void speak(String str) {
          mTTS.speak(str, TextToSpeech.QUEUE_FLUSH, null);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mTTS.shutdown();
    }

    @Override
    public void onInit(int status) {
        if (status == TextToSpeech.SUCCESS) {
            int result = mTTS.setLanguage(Locale.UK);
            mTTS.setPitch(0.8f);
            mTTS.setSpeechRate(1.1f);

            if (result == TextToSpeech.LANG_MISSING_DATA
                    || result == TextToSpeech.LANG_NOT_SUPPORTED) {
                Log.e("TTS", "Language not supported");
            } else {
                mSpeak.setEnabled(true);
            }
        } else {
            Log.e("TTS", "Initialization failed");
        }
    }
}

在前面的代码中，speakstr方法用于运行TTS并让Devision开始说话。 但是，当我尝试在按下mSpeak按钮时运行TextToSpeech时，它工作正常。但是，当在onCreate上运行它时，它不起作用

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我希望当活动开始时，TextToSpeech应该播放。任何人都可以指导我做这件事的正确方法，因为它不起作用。TextToSpeech只在按下按钮的情况下工作。

这是因为TTS正在初始化一段时间，速度非常快，但您仍然无法创建新的TextToSpeech，下面的几行几乎立即调用mTTS.speak。此时您不知道TTS是否可用-您必须等待status==TextToSpeech.SUCCESS和language available确认，所以您应该将welcome speak方法调用移到那里

@Override
public void onInit(int status) {
    if (status == TextToSpeech.SUCCESS) {
        int result = mTTS.setLanguage(Locale.UK);
        mTTS.setPitch(0.8f);
        mTTS.setSpeechRate(1.1f);

        if (result == TextToSpeech.LANG_MISSING_DATA
                || result == TextToSpeech.LANG_NOT_SUPPORTED) {
            Log.e("TTS", "Language not supported");
        } else {
            mSpeak.setEnabled(true);
            speak("Hello, If Your Case Is Emergency CALL 911 , IF not Continue");
        }
    } else {
        Log.e("TTS", "Initialization failed");
    }
}

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好的，谢谢你：