typedef struct XrSystemExtensionPropertiesANDROID {
    XrStructureType          type;
    void*                    next;
    XrExtensionProperties    properties;
    XrBool32                 isSupported;
} XrSystemExtensionPropertiesANDROID;

typedef struct XrEventDataSystemPropertiesChangedANDROID {
    XrStructureType    type;
    const void*        next;
} XrEventDataSystemPropertiesChangedANDROID;

XrResult xrEnumerateSystemExtensionPropertiesANDROID(
    XrInstance                                  instance,
    XrSystemId                                  systemId,
    uint32_t                                    propertyCapacityInput,
    uint32_t*                                   propertyCountOutput,
    XrSystemExtensionPropertiesANDROID*         properties);

XrInstance instance; // XrInstance previously created

XrSystemId systemId; // XrSystemId from a previously created instance

PFN_xrEnumerateSystemExtensionPropertiesANDROID xrEnumerateSystemExtensionPropertiesANDROID;

// Poll events for recommended resolution changes.
XrEventDataBuffer event = {XR_TYPE_EVENT_DATA_BUFFER};
XrResult result = xrPollEvent(instance, &event);

if (result == XR_SUCCESS) {
    switch (event.type) {
        case XR_TYPE_EVENT_DATA_SYSTEM_PROPERTIES_CHANGED_ANDROID:
            // It's possible that the system was lost and a new id will be returned
            XrSystemId newSystemId;
            XrSystemGetInfo getInfo = {XR_TYPE_SYSTEM_GET_INFO};
            getInfo.formFactor = XR_FORM_FACTOR_HEAD_MOUNTED_DISPLAY;
            if(XR_SUCCESS == xrGetSystem(instance, &getInfo, &newSystemId)) {
                if(systemId != newSystemId) {
                    //Do things like recreate the session
                    systemId = newSystemId;
                }
            }

            // Enumerate the extensions to see which ones are now supported based on hardware changes
            uint32_t extensionsCount;
            xrEnumerateSystemExtensionPropertiesANDROID(instance, systemId, 0, &extensionsCount, NULL);

            std::vector<XrSystemExtensionPropertiesANDROID> properties(extensionsCount,
                {.type = XR_TYPE_SYSTEM_EXTENSION_PROPERTIES_ANDROID});

            XrResult result = xrEnumerateSystemExtensionPropertiesANDROID(
                instance,
                systemId,
                extensionsCount,
                &extensionsCount,
                properties.data()
            );

            // Do something based on which extensions are now supported by the system
            break;
    }
}

PFN_xrEnumerateSystemExtensionPropertiesANDROID xrEnumerateSystemExtensionPropertiesANDROID;

XrInstance instance;
XrInstanceCreateInfo createInfo = {XR_TYPE_INSTANCE_CREATE_INFO};
// Initialize the createInfo with appropriate values for the application
CHK_XR(xrCreateInstance(&createInfo, &instance));

// Get the systemId for the system.
XrSystemId systemId;
XrSystemGetInfo getInfo = {XR_TYPE_SYSTEM_GET_INFO};
getInfo.formFactor = XR_FORM_FACTOR_HEAD_MOUNTED_DISPLAY;
CHK_XR(xrGetSystem(instance, &getInfo, &systemId));

// Enumerate the system extension properties.
uint32_t extensionsCount;
xrEnumerateSystemExtensionPropertiesANDROID(instance, systemId, 0, &extensionsCount, NULL);

std::vector<XrSystemExtensionPropertiesANDROID> properties(extensionsCount,
    {.type = XR_TYPE_SYSTEM_EXTENSION_PROPERTIES_ANDROID});

XrResult result = xrEnumerateSystemExtensionPropertiesANDROID(
    instance,
    systemId,
    extensionsCount,
    &extensionsCount,
    properties.data()
);