exemple de AlwaysOnHotwordDetector sur Android

à moins d'avoir un énorme angle mort, Je ne pense pas que les applications tierces puissent utiliser cette API. Son étrange qu'

si vous construisez une application privilégiée, regardez à travers ces projets de test de PSBA:

• Interaction Vocale-Basic AlwaysOnHotwordDetector utilisation/mise en œuvre http://androidxref.com/5.0.0_r2/xref/frameworks/base/tests/VoiceInteraction/
• Inscription Vocale - http://androidxref.com/5.0.0_r2/xref/frameworks/base/tests/VoiceEnrollment/

en essayant de faire ce travail, je suis tombé sur ceci:

AlwaysOnHotwordDetector's constructeur:

/**
 * @param text The keyphrase text to get the detector for.
 * @param locale The java locale for the detector.
 * @param callback A non-null Callback for receiving the recognition events.
 * @param voiceInteractionService The current voice interaction service.
 * @param modelManagementService A service that allows management of sound models.
 *
 * @hide
 */
public AlwaysOnHotwordDetector(String text, Locale locale, Callback callback,
        KeyphraseEnrollmentInfo keyphraseEnrollmentInfo,
        IVoiceInteractionService voiceInteractionService,
        IVoiceInteractionManagerService modelManagementService) {
    mText = text;
    mLocale = locale;
    mKeyphraseEnrollmentInfo = keyphraseEnrollmentInfo;
    mKeyphraseMetadata = mKeyphraseEnrollmentInfo.getKeyphraseMetadata(text, locale);
    mExternalCallback = callback;
    mHandler = new MyHandler();
    mInternalCallback = new SoundTriggerListener(mHandler);
    mVoiceInteractionService = voiceInteractionService;
    mModelManagementService = modelManagementService;
    new RefreshAvailabiltyTask().execute();
}

La déclaration d'intérêt, ici, est:

mKeyphraseMetadata = mKeyphraseEnrollmentInfo.getKeyphraseMetadata(text, locale);

Que KeyphraseEnrollmentInfo#getKeyphraseMetadata(String, Locale) faire?

/**
 * Gets the {@link KeyphraseMetadata} for the given keyphrase and locale, null if any metadata
 * isn't available for the given combination.
 *
 * @param keyphrase The keyphrase that the user needs to be enrolled to.
 * @param locale The locale for which the enrollment needs to be performed.
 *        This is a Java locale, for example "en_US".
 * @return The metadata, if the enrollment client supports the given keyphrase
 *         and locale, null otherwise.
 */
public KeyphraseMetadata getKeyphraseMetadata(String keyphrase, Locale locale) {
    if (mKeyphrases == null || mKeyphrases.length == 0) {
        Slog.w(TAG, "Enrollment application doesn't support keyphrases");
        return null;
    }
    for (KeyphraseMetadata keyphraseMetadata : mKeyphrases) {
        // Check if the given keyphrase is supported in the locale provided by
        // the enrollment application.
        if (keyphraseMetadata.supportsPhrase(keyphrase)
                && keyphraseMetadata.supportsLocale(locale)) {
            return keyphraseMetadata;
        }
    }
    Slog.w(TAG, "Enrollment application doesn't support the given keyphrase/locale");
    return null;
}

a ce point, mon projet d'exemple n'arrêtait pas de me dire: Enrollment application doesn't support keyphrases. Donc, en creusant un peu plus - pour prendre en charge les bases de données, nous devons fournir des méta-données supplémentaires:

// Taken from class KeyphraseEnrollmentInfo
/**
 * Name under which a Hotword enrollment component publishes information about itself.
 * This meta-data should reference an XML resource containing a
 * <code>&lt;{@link
 * android.R.styleable#VoiceEnrollmentApplication
 * voice-enrollment-application}&gt;</code> tag.
 */
private static final String VOICE_KEYPHRASE_META_DATA = "android.voice_enrollment";

de plus, nous aurons besoin du android.permission.MANAGE_VOICE_KEYPHRASES permission. C'est là que le projet d'exemple est bloqué:

<!-- Must be required by hotword enrollment application,
     to ensure that only the system can interact with it.
     @hide <p>Not for use by third-party applications.</p> -->
<permission android:name="android.permission.MANAGE_VOICE_KEYPHRASES"
    android:label="@string/permlab_manageVoiceKeyphrases"
    android:description="@string/permdesc_manageVoiceKeyphrases"
    android:protectionLevel="signature|system" />

la permission requise pour supporter la détection de mots clés n'est pas disponible pour les applications tierces. Je n'arrive toujours pas à comprendre pourquoi le paquet android.service.voice paquet a accès public. Peut-être que je suis absent quelque chose ici.