diff --git a/camera/libcameraservice/CameraHardwareStub.cpp b/camera/libcameraservice/CameraHardwareStub.cpp
index ea21af8..3d6b0b1 100644
--- a/camera/libcameraservice/CameraHardwareStub.cpp
+++ b/camera/libcameraservice/CameraHardwareStub.cpp
@@ -183,6 +183,10 @@
     mPreviewThread.clear();
 }
 
+bool CameraHardwareStub::previewEnabled() {
+    return mPreviewThread != 0;
+}
+
 // ---------------------------------------------------------------------------
 
 int CameraHardwareStub::beginAutoFocusThread(void *cookie)