Way to nest multiple voice triggers when launching an app with GDK

Question

Is there a way to nest voice triggers when launching an app on Google Glass using the GDK? For example instead of just saying "ok, glass" -> "What's its power level?" I'd like to have the app present an option. For example "ok, glass" -> "What's its power level?" -> "Over 9000" OR "Under 9000". Any help would be great!

Answer 1

If you have multiple activities/services installed on Glass that have the same voice trigger intent filter, all of their names (based on the android:label attribute of the <activity> or <service> tag in AndroidManifest.xml) will appear in a disambiguation "submenu" when you speak that voice trigger.

For example (assume that res/xml/play_a_game_trigger.xml represents a voice trigger for the string "play a game"):

<activity android:label="Tennis">
    <intent-filter>
        <action android:name="com.google.android.glass.action.VOICE_TRIGGER" />
    </intent-filter>
    <meta-data android:name="com.google.android.glass.VoiceTrigger"
        android:resource="@xml/play_a_game_trigger" />
</activity>
<activity android:label="Bowling">
    <intent-filter>
        <action android:name="com.google.android.glass.action.VOICE_TRIGGER" />
    </intent-filter>
    <meta-data android:name="com.google.android.glass.VoiceTrigger"
        android:resource="@xml/play_a_game_trigger" />
</activity>

would give you a voice menu flow that looks like

ok glass → play a game → Tennis
                         Bowling

Do note, however, that this menu would also include activities/services from other APKs that use the same voice trigger as well.

You can find more details at the Voice Input page of the GDK documentation.

Answer 2

The proper way to do this is using an input tag inside the trigger

<trigger keyword="@string/start_app" >

    <input prompt="@string/promt_text" />

</trigger>

This prompts an input and waits for more audio speech.

Then in your activity you can capture this text with:

ArrayList<String> text = getIntent().getExtras().getStringArrayList(RecognizerIntent.EXTRA_RESULTS);