Android文字语音不起作用

Question

我正在尝试在静态字符串上运行tts，但是我无法听到TTS的任何输出，这是我的代码。

public class MainActivity extends AppCompatActivity implements 
CircleMenu.OnItemClickListener,GoogleApiClient.OnConnectionFailedListener,
TextToSpeech.OnInitListener{
    private static final String TAG = "MainActivity";
    RecyclerView recyclerView;
    MaterialDialog.Builder materialDialog;
    CardAdapter cardAdapter;
    private GoogleApiClient mGoogleApiClient;
    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAuthStateListener;
    private static int RC_SIGNIN=0;
    ProgressDialog progressDialog;
    FirebaseClient firebaseClient;
    TextToSpeech textToSpeech;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textToSpeech=new TextToSpeech(this,this);
        textToSpeech.speak("I am Supposed TO Shout",TextToSpeech.QUEUE_FLUSH,null,null);
    }

    @Override
    protected void onPause() {
        textToSpeech.stop();
        textToSpeech.shutdown();
        super.onPause();
    }

    @Override
    public void onInit(int status)
    {
        if(status==TextToSpeech.SUCCESS){
            Toast.makeText(this, "Your Device Is Not Missing TTS", Toast.LENGTH_SHORT).show();

            int language=textToSpeech.setLanguage(Locale.UK);
            if(language==TextToSpeech.LANG_MISSING_DATA || language==TextToSpeech.LANG_NOT_SUPPORTED)
            {

            }
        }
        else{
            Toast.makeText(this, "Your Device Is Missing TTS", Toast.LENGTH_SHORT).show();
        }
    }
}

我不知道我在哪里错了，我在github上寻找类似的代码，它们和我在这里完全相同Credits:SurvingWithAndroid 但他们似乎在我的设备上工作