java - TTS : Speak fails

Question

我正在使用一个简单的代码来使用文本转语音:

package ch.yourclick.kitt.fragments;

import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import java.util.Locale;
import ch.yourclick.kitt.R;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link GeneralFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class GeneralFragment extends Fragment {
    private TextToSpeech tts;

    public GeneralFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @return A new instance of fragment General.
     */
    // TODO: Rename and change types and number of parameters
    public static GeneralFragment newInstance() {
        GeneralFragment fragment = new GeneralFragment();
        Bundle args = new Bundle();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_general, container, false);
        Button hello = view.findViewById(R.id.hello);

        // Text to speech
        tts = new TextToSpeech(getActivity(), new TextToSpeech.OnInitListener() {
            @Override
            public void onInit(int status) {
                if (status == TextToSpeech.SUCCESS) { // <-- I never get into that if statement
                    int result = tts.setLanguage(Locale.getDefault());
                    // Language is not supported
                    if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {
                        Log.e("TTS", "Language not supported");
                    }
                }
                else {
                    Log.e("TTS", "" + status); // Returns -1
                    Log.e("TTS", "" + TextToSpeech.SUCCESS); // Returns 0
                }
            }
        });

        hello.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                speak();
            }
        });
        return view;
    }

    /**
     * Speak
     */
    private void speak() {
        String text = "Hello";
        tts.speak(text, TextToSpeech.QUEUE_FLUSH, null);
    }

    /**
     * Turn off
     */
    @Override
    public void onDestroy() {
        if (tts != null) {
            tts.stop();
            tts.shutdown();
        }
        super.onDestroy();
    }
}

我收到消息:

W/TextToSpeech: speak failed: not bound to TTS engine

我的问题是无法初始化文本到语音: status返回 -1 和 TextToSpeech.SUCCESS返回 0。
我正在使用 Android Studio，我的虚拟设备是 Pixel 2 API 30。所以 Google Text-to-speech Engine 似乎安装在它上面:

设置 -> 辅助功能 -> 文字转语音输出
如果我点击播放，我会听到一个声音，所以我知道这不应该是设备问题。但为什么它不适用于我的应用程序？我没有得到任何错误。
我不知道我做错了什么。如果您知道答案或有任何建议，请告诉我!

Answer 1

谷歌 says “以 Android 11 为目标且使用文本转语音的应用应在其 list 的查询元素中声明 TextToSpeech.Engine#INTENT_ACTION_TTS_SERVICE:”
因此，将其添加到您的 AndroidManifest.xml 中:

<queries>
    <intent>
        <action android:name="android.intent.action.TTS_SERVICE" />
    </intent>
</queries>

在 <application 之前添加这个标签对我有用。 (Android Studio 说 Element queries is not allowed here 虽然)。