diff --git a/include/ui/Camera.h b/include/ui/Camera.h
index ae6e255..9ceb8fd 100644
--- a/include/ui/Camera.h
+++ b/include/ui/Camera.h
@@ -143,6 +143,9 @@
             // autoFocus - status returned from callback
             status_t    autoFocus();
 
+            // cancel auto focus
+            status_t    cancelAutoFocus();
+
             // take a picture - picture returned from callback
             status_t    takePicture();
 
diff --git a/include/ui/CameraHardwareInterface.h b/include/ui/CameraHardwareInterface.h
index 535f70e..5fbb7d8 100644
--- a/include/ui/CameraHardwareInterface.h
+++ b/include/ui/CameraHardwareInterface.h
@@ -161,6 +161,14 @@
     virtual status_t    autoFocus() = 0;
 
     /**
+     * Cancels auto-focus function. If the auto-focus is still in progress,
+     * this function will cancel it. Whether the auto-focus is in progress
+     * or not, this function will return the focus position to the default.
+     * If the camera does not support auto-focus, this is a no-op.
+     */
+    virtual status_t    cancelAutoFocus() = 0;
+
+    /**
      * Take a picture.
      */
     virtual status_t    takePicture() = 0;
diff --git a/include/ui/ICamera.h b/include/ui/ICamera.h
index 1df7914..7595e36 100644
--- a/include/ui/ICamera.h
+++ b/include/ui/ICamera.h
@@ -76,6 +76,9 @@
     // auto focus
     virtual status_t        autoFocus() = 0;
 
+    // cancel auto focus
+    virtual status_t        cancelAutoFocus() = 0;
+
     // take a picture
     virtual status_t        takePicture() = 0;