fix: fix quest navigation

Author: doranteseduardo

android/sharedCode/src/main/cpp/VROInputControllerOpenXR.cpp

@@ -376,10 +376,12 @@ void VROInputControllerOpenXR::onProcess(XrSession session, XrSpace baseSpace,
         xrGetActionStateBoolean(session, &info, &state);
         if (state.isActive) {
             bool pressed = (state.currentState == XR_TRUE);
-            if (pressed && !_prevBButton)
+            if (pressed && !_prevBButton) {
                 VROInputControllerBase::onButtonEvent(ViroOculus::BackButton, VROEventDelegate::ClickState::ClickDown);
-            else if (!pressed && _prevBButton)
+                if (_backButtonCallback) _backButtonCallback();
+            } else if (!pressed && _prevBButton) {
                 VROInputControllerBase::onButtonEvent(ViroOculus::BackButton, VROEventDelegate::ClickState::ClickUp);
+            }
             _prevBButton = pressed;
         }
     }
@@ -424,10 +426,12 @@ void VROInputControllerOpenXR::onProcess(XrSession session, XrSpace baseSpace,
         xrGetActionStateBoolean(session, &info, &state);
         if (state.isActive) {
             bool pressed = (state.currentState == XR_TRUE);
-            if (pressed && !_prevMenuButton)
+            if (pressed && !_prevMenuButton) {
                 VROInputControllerBase::onButtonEvent(ViroOculus::BackButton, VROEventDelegate::ClickState::ClickDown);
-            else if (!pressed && _prevMenuButton)
+                if (_backButtonCallback) _backButtonCallback();
+            } else if (!pressed && _prevMenuButton) {
                 VROInputControllerBase::onButtonEvent(ViroOculus::BackButton, VROEventDelegate::ClickState::ClickUp);
+            }
             _prevMenuButton = pressed;
         }
     }

android/sharedCode/src/main/cpp/VROInputControllerOpenXR.h

@@ -27,6 +27,7 @@
 #ifndef ANDROID_VROINPUTCONTROLLEROPENXR_H
 #define ANDROID_VROINPUTCONTROLLEROPENXR_H
 
+#include <functional>
 #include <memory>
 #include <openxr/openxr.h>
 #include "VROInputControllerBase.h"
@@ -89,6 +90,15 @@ class VROInputControllerOpenXR : public VROInputControllerBase {
     std::string getHeadset()    override { return "quest"; }
     std::string getController() override { return "touch"; }
 
+    /*
+     * Set a callback invoked on the render thread when the B/Menu button is
+     * pressed (ClickDown). Used to dispatch KEYCODE_BACK to the host Activity
+     * so React Native's BackHandler fires in VRActivity.
+     */
+    void setBackButtonCallback(std::function<void()> callback) {
+        _backButtonCallback = std::move(callback);
+    }
+
 protected:
     std::shared_ptr<VROInputPresenter> createPresenter(
         std::shared_ptr<VRODriver> driver) override;
@@ -128,6 +138,9 @@ class VROInputControllerOpenXR : public VROInputControllerBase {
     XrSpace _leftSpace  = XR_NULL_HANDLE;
     XrSpace _rightSpace = XR_NULL_HANDLE;
 
+    // ── Back button callback ──────────────────────────────────────────────────
+    std::function<void()> _backButtonCallback;
+
     // ── Edge-detection state (previous frame) ────────────────────────────────
     bool _prevTriggerLeft  = false;
     bool _prevTriggerRight = false;

android/sharedCode/src/main/cpp/VROSceneRendererOpenXR.cpp

@@ -140,6 +140,29 @@ VROSceneRendererOpenXR::VROSceneRendererOpenXR(VRORendererConfiguration config,
     _inputController->createActionSet(_instance, _session);
     initHandTracking();  // no-op if XR_EXT_hand_tracking not available on this device
 
+    // Wire the B/Menu button back to Android's back-press so React Native's
+    // BackHandler fires in VRActivity. The callback runs on the render thread;
+    // ViroViewOpenXR.onNativeBackButton() posts to the UI thread internally.
+    {
+        JavaVM *jvm = _jvm;
+        jobject jview = _jview;  // global ref — safe to capture
+        _inputController->setBackButtonCallback([jvm, jview]() {
+            JNIEnv *env = nullptr;
+            bool attached = false;
+            if (jvm->GetEnv((void **)&env, JNI_VERSION_1_6) == JNI_EDETACHED) {
+                jvm->AttachCurrentThread(&env, nullptr);
+                attached = true;
+            }
+            if (env) {
+                jclass cls = env->GetObjectClass(jview);
+                jmethodID mid = env->GetMethodID(cls, "onNativeBackButton", "()V");
+                env->DeleteLocalRef(cls);
+                if (mid) env->CallVoidMethod(jview, mid);
+            }
+            if (attached) jvm->DetachCurrentThread();
+        });
+    }
+
     // Create the shared VRORenderer and wire it to the input controller.
     // VROSceneRenderer::_renderer is null until explicitly set here — every other
     // platform (GVR, OVR) does the equivalent in their constructor.

android/sharedCode/src/main/java/com/viro/core/ViroViewOpenXR.java

@@ -603,6 +603,20 @@ public boolean onTouchEvent(MotionEvent event) {
 
     // ── Callbacks from native (VROSceneRendererOpenXR) ─────────────────────────────
 
+    /**
+     * Called by native code (render thread) when the B or Menu controller button
+     * is pressed. Posts Activity.onBackPressed() to the UI thread so React Native's
+     * BackHandler receives the event in VRActivity.
+     *
+     * @hide
+     */
+    void onNativeBackButton() {
+        Activity activity = mWeakActivity.get();
+        if (activity != null) {
+            activity.runOnUiThread(activity::onBackPressed);
+        }
+    }
+
     /**
      * Called by native code each frame on the render thread so that queued
      * Java callbacks (frame listeners) are executed on the correct thread.