UtteranceProgressListener(TTS)不工作或未调用（Android 4.4.2)

Question

两天以来，我试图让一个UtteranceProgressListener工作。我尝试了很多来自Stackoverflow和其他网站的代码--没有一个对我有效。下面是我当前的代码：

private void activateTTS() {
    tts=new TextToSpeech(getApplicationContext(), new TextToSpeech.OnInitListener() {

        @Override
        public void onInit(int status) {
            if (status == TextToSpeech.SUCCESS) {
                int result=tts.setLanguage(Locale.getDefault());
                if (result==TextToSpeech.LANG_MISSING_DATA ||
                        result==TextToSpeech.LANG_NOT_SUPPORTED) {
                }
                tts.setOnUtteranceProgressListener(new UtteranceProgressListener() {
                    @Override 
                    public void onDone(String utteranceId) {
                        if (utteranceId == "myId") {
                            //[...] all my code that is not being called
                            //when speaking is finished
                        }
                    } 

                    @Override 
                    public void onError(String utteranceId) {
                    } 

                    @Override 
                    public void onStart(String utteranceId) {
                    } 
                });
            }
        }
    });
}

params = new HashMap<String, String>();
params.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, "myId");
tts.speak(myString, TextToSpeech.QUEUE_FLUSH, params);

private static TextToSpeech tts;
private HashMap<String, String> params;

public class TTSPlayer extends MainActivity {
//[all my code]
}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.saschaha.readit"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="15"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:configChanges="orientation|keyboardHidden|screenSize"
        android:name="com.saschaha.readit.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name="com.saschaha.readit.TTSPlayer"
        android:label="@string/ReadIt" >
    </activity>
</application>
</manifest>

Answer 1

错误与字符串比较有关

if (utteranceId == "myId")  

将其更改为

if ("myId".equals(utteranceId))