我的Android应用程序具有文本说话功能,并且有多个活动使用此功能。因此创建了一个静态助手类来简化这一过程。
import java.util.Locale;
import android.content.Context;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.util.Log;
public class TextToSpeechController implements OnInitListener {
private static final String TAG = "TextToSpeechController";
private TextToSpeech myTTS;
private String textToSpeak;
private Context context;
private static TextToSpeechController singleton;
public static TextToSpeechController getInstance(Context ctx) {
if (singleton == null)
singleton = new TextToSpeechController(ctx);
return singleton;
}
private TextToSpeechController(Context ctx) {
context = ctx;
}
public void speak(String text) {
textToSpeak = text;
if (myTTS == null) {
// currently can't change Locale until speech ends
try {
// Initialize text-to-speech. This is an asynchronous operation.
// The OnInitListener (second argument) is called after
// initialization completes.
myTTS = new TextToSpeech(context, this);
} catch (Exception e) {
e.printStackTrace();
}
}
sayText();
}
public void onInit(int initStatus) {
if (initStatus == TextToSpeech.SUCCESS) {
if (myTTS.isLanguageAvailable(Locale.UK) == TextToSpeech.LANG_AVAILABLE)
myTTS.setLanguage(Locale.UK);
}
// status can be either TextToSpeech.SUCCESS or TextToSpeech.ERROR.
if (initStatus == TextToSpeech.SUCCESS) {
int result = myTTS.setLanguage(Locale.UK);
if (result == TextToSpeech.LANG_MISSING_DATA
|| result == TextToSpeech.LANG_NOT_SUPPORTED) {
Log.e(TAG, "TTS missing or not supported (" + result + ")");
// Language data is missing or the language is not supported.
// showError(R.string.tts_lang_not_available);
} else {
// Initialization failed.
Log.e(TAG, "Error occured");
}
}
}
private void sayText() {
// ask TTs to say the text
myTTS.speak(this.textToSpeak, TextToSpeech.QUEUE_FLUSH, null);
}
public void stopTTS() {
if (myTTS != null) {
myTTS.shutdown();
myTTS.stop();
myTTS = null;
}
}
}
我正在使用这样的助手类。
TextToSpeechController.getInstance(this).speak(readableMessage);
但有时候我会在LogCat上看到像beloew这样的错误。
"speak:failed not bound to tts engine"
没有抛出任何异常,但TTS没有引发任何异常。 我意识到如果我从BroadcastReceiver触发活动,我就会收到此错误。否则,如果从应用程序代码手动打开活动没有问题。
这是BroadcastReceiver代码
private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);
String readableMessage = intent.getExtras().getString(READABLE_MESSAGE);
Bundle b = new Bundle();
b.putString(EXTRA_MESSAGE, newMessage);
b.putString(READABLE_MESSAGE, readableMessage);
Intent newIntent = new Intent("android.intent.action.MAIN");
newIntent.setClass(context, Speak.class);
newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
newIntent.putExtra("MessageReceived", b);
newIntent.putExtra("CallType", CallType.NOTIFICATION);
context.startActivity(newIntent);
}
};
答案 0 :(得分:7)
您的代码不等待从TextToSpeech类的构造函数返回异步。你甚至有一个评论说它是异步的。为什么它总是在接收器中失败而不是我不确定的活动 - 除此之外,作为前台任务的Activity可能具有更高的优先级,并且它恰好在你调用sayText之前完成。
你需要等待调用sayText,直到init调用返回它必须新建一个新TTS对象的情况。
答案 1 :(得分:4)
这是我用于文本到语音的代码。对于我的代码,只需输入speakWords("说些什么");在任何活动中。
public class VoiceRecognition extends Activity implements OnClickListener,
OnInitListener {
public static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;
public Button speakButton;
// TTS object
public TextToSpeech myTTS;
// status check code
public int MY_DATA_CHECK_CODE = 0;
// setup TTS
public void onInit(int initStatus) {
// check for successful instantiation
if (initStatus == TextToSpeech.SUCCESS) {
if (myTTS.isLanguageAvailable(Locale.US) == TextToSpeech.LANG_AVAILABLE)
myTTS.setLanguage(Locale.US);
} else if (initStatus == TextToSpeech.ERROR) {
Toast.makeText(this, "Sorry! Text To Speech failed...",
Toast.LENGTH_LONG).show();
}
}
/**
* Called with the activity is first created.
*/
@Override
public void onCreate(Bundle voiceinput) {
super.onCreate(voiceinput);
// Inflate our UI from its XML layout description.
setContentView(R.layout.voice_recognition);
// check for TTS data
Intent checkTTSIntent = new Intent();
checkTTSIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
startActivityForResult(checkTTSIntent, MY_DATA_CHECK_CODE);
}
// speak the user text
public void speakWords(String speech) {
// speak straight away
myTTS.speak(speech, TextToSpeech.QUEUE_FLUSH, null);
}
public void onClick(View v) {
speakWords("hello";
}
/**
* Handle the results from the recognition activity.
*/
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == MY_DATA_CHECK_CODE) {
if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {
// the user has the necessary data - create the TTS
myTTS = new TextToSpeech(this, this);
} else {
// no data - install it now
Intent installTTSIntent = new Intent();
installTTSIntent
.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
startActivity(installTTSIntent);
}
}
super.onActivityResult(requestCode, resultCode, data);
}
@Override
protected void onDestroy() {
super.onDestroy();
myTTS.shutdown();
}