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我創建了一個簡單的語音識別服務：爲此，我創建了一個android.speech.RecognitionService的子類，並創建了一個活動來啓動和停止此服務。如何註冊自定義語音識別服務？
我的自定義語音識別服務平凡使用默認的語音識別器，因爲我的目標只是瞭解RecognitionService和RecognitionService.Callback類如何工作。
public class SimpleVoiceService extends RecognitionService {
private SpeechRecognizer m_EngineSR;
@Override
public void onCreate() {
super.onCreate();
Log.i("SimpleVoiceService", "Service started");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i("SimpleVoiceService", "Service stopped");
}
@Override
protected void onCancel(Callback listener) {
m_EngineSR.cancel();
}
@Override
protected void onStartListening(Intent recognizerIntent, Callback listener) {
m_EngineSR.setRecognitionListener(new VoiceResultsListener(listener));
m_EngineSR.startListening(recognizerIntent);
}
@Override
protected void onStopListening(Callback listener) {
m_EngineSR.stopListening();
}
/**
*
*/
private class VoiceResultsListener implements RecognitionListener {
private Callback m_UserSpecifiedListener;
/**
*
* @param userSpecifiedListener
*/
public VoiceResultsListener(Callback userSpecifiedListener) {
m_UserSpecifiedListener = userSpecifiedListener;
}
@Override
public void onBeginningOfSpeech() {
try {
m_UserSpecifiedListener.beginningOfSpeech();
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onBufferReceived(byte[] buffer) {
try {
m_UserSpecifiedListener.bufferReceived(buffer);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onEndOfSpeech() {
try {
m_UserSpecifiedListener.endOfSpeech();
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onError(int error) {
try {
m_UserSpecifiedListener.error(error);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onEvent(int eventType, Bundle params) { ; }
@Override
public void onPartialResults(Bundle partialResults) {
try {
m_UserSpecifiedListener.partialResults(partialResults);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onReadyForSpeech(Bundle params) {
try {
m_UserSpecifiedListener.readyForSpeech(params);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onResults(Bundle results) {
try {
m_UserSpecifiedListener.results(results);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onRmsChanged(float rmsdB) {
try {
m_UserSpecifiedListener.rmsChanged(rmsdB);
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
}
我使用以下活動啓動和停止服務。
public class VoiceServiceStarterActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Button startButton = new Button(this);
startButton.setText("Start the service");
startButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { startVoiceService(); }
});
Button stopButton = new Button(this);
stopButton.setText("Stop the service");
stopButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { stopVoiceService(); }
});
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
layout.addView(startButton);
layout.addView(stopButton);
setContentView(layout);
}
private void startVoiceService() {
startService(new Intent(this, SimpleVoiceService.class));
}
private void stopVoiceService() {
stopService(new Intent(this, SimpleVoiceService.class));
}
}
最後，我宣佈我對AndroidManifest.xml服務（見Android SDK中的文件夾內VoiceRecognition樣品）。
<service android:name="SimpleVoiceService"
android:label="@string/service_name" >
<intent-filter>
<action android:name="android.speech.RecognitionService" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</service>
然後我安裝在Android設備上這個應用程序，我啓動它： - 當我啓動該服務，它正常啓動; - 當我停下來時，它會正常停止。
但是，如果我在另一活動中啓動以下代碼，則activitiesList僅包含一個元素，它是默認的語音識別器。
PackageManager pm = getPackageManager();
List<ResolveInfo> activities = pm.queryIntentActivities(
new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
爲什麼我的語音識別器不能在系統中存在的人之間返回？
這是否讓我們重寫「谷歌現在」默認RecognitionService？我的意思是，我現在可以將我自己的擴展識別服務掛鉤到Google嗎？ – 2014-12-09 18:51:09
當您啓動SimpleVoiceSearch服務時，您的onStartListening是否已開始工作？ @ enzom83 – 2016-10-09 07:34:46