[VisionGlass] Add voice search button to Phone UI

Added a new Voice Search button to the phone UI. It's only enabled
when the keyboard is shown, i.e., when input is required. Once
clicked the handling of the input is directly managed by the
KeyboardWidget which properly handles the different types of input
(like entering text in a Web page vs entering text in a UI widget).

app/src/common/shared/com/igalia/wolvic/VRBrowserActivity.java

@@ -2118,6 +2118,9 @@ public AppServicesProvider getServicesProvider() {
         return (AppServicesProvider)getApplication();
     }
 
+    @Override
+    public KeyboardWidget getKeyboard() { return mKeyboard; }
+
     private native void addWidgetNative(int aHandle, WidgetPlacement aPlacement);
     private native void updateWidgetNative(int aHandle, WidgetPlacement aPlacement);
     private native void updateVisibleWidgetsNative();

app/src/common/shared/com/igalia/wolvic/ui/widgets/KeyboardWidget.java

@@ -1496,4 +1496,9 @@ public void onSessionChanged(@NonNull Session aOldSession, @NonNull Session aSes
         aOldSession.removeTextInputListener(this);
         aSession.addTextInputListener(this);
     }
+
+    public void simulateVoiceButtonClick() {
+        mKeyboardVoiceButton.performClick();
+    }
+
 }

app/src/common/shared/com/igalia/wolvic/ui/widgets/WidgetManagerDelegate.java

@@ -124,4 +124,5 @@ interface WebXRListener {
     void updateLocale(@NonNull Context context);
     @NonNull
     AppServicesProvider getServicesProvider();
+    KeyboardWidget getKeyboard();
 }

app/src/main/res/layout/visionglass_layout.xml

@@ -28,14 +28,13 @@
                 android:textOn="" />
 
             <ImageButton
-                android:id="@+id/voice_button"
+                android:id="@+id/phoneUIVoiceButton"
                 android:layout_width="0dp"
                 android:layout_height="match_parent"
                 android:layout_weight="1"
                 android:contentDescription="@string/voice_search_tooltip"
                 android:scaleType="fitCenter"
-                android:src="@drawable/ic_icon_microphone"
-                android:visibility="invisible"/>
+                android:src="@drawable/ic_icon_microphone" />
         </LinearLayout>
 
         <View

app/src/visionglass/java/com/igalia/wolvic/PlatformActivity.java

@@ -59,6 +59,7 @@ public class PlatformActivity extends ComponentActivity implements SensorEventLi
     private DisplayManager mDisplayManager;
     private Display mPresentationDisplay;
     private VisionGlassPresentation mActivePresentation;
+    private View mVoiceSearchButton;
 
     @SuppressWarnings("unused")
     public static boolean filterPermission(final String aPermission) {
@@ -165,6 +166,9 @@ public void onConnectionChange(boolean b) {
     private void initVisionGlassPhoneUI() {
         setContentView(R.layout.visionglass_layout);
 
+        mVoiceSearchButton = findViewById(R.id.phoneUIVoiceButton);
+        mVoiceSearchButton.setEnabled(false);
+
         View touchpad = findViewById(R.id.touchpad);
         touchpad.setOnClickListener(v -> {
             // We don't really need the coordinates of the click because we use the position
@@ -423,6 +427,7 @@ private class PlatformActivityPluginVisionGlass implements PlatformActivityPlugi
 
         @Override
         public void onKeyboardVisibilityChange(boolean isVisible) {
+            mVoiceSearchButton.setEnabled(isVisible);
         }
 
         // Setup the phone UI callbacks that require access to the WindowManagerDelegate.
@@ -436,6 +441,11 @@ private void setupPhoneUI() {
                 mDelegate.setHeadLockEnabled(headlockButton.isChecked());
             });
 
+            findViewById(R.id.phoneUIVoiceButton).setOnClickListener(v -> {
+                // Delegate all the voice input handling in the KeyboardWidget which already handles
+                // all the potential voice input cases.
+                mDelegate.getKeyboard().simulateVoiceButtonClick();
+            });
         }
     }