diff --git a/README.md b/README.md
index 2e5f1461..58c442b5 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@ compile 'com.otaliastudios:cameraview:1.1.1'
   - Plug in location tags with `setLocation()` API
 - `CameraUtils` to help with Bitmaps and orientations
 - Lightweight, no dependencies, just support `ExifInterface`
+- Works down to API level 15
 
 # Docs
 
@@ -151,14 +152,12 @@ camera.addCameraListener(new CameraListener() {
     @Override
     public void onCameraOpened(CameraOptions options) {}
 
-
     /**
      * Notifies that the camera session was closed.
      */
     @Override
     public void onCameraClosed() {}
 
-
     /**
      * Notifies that a picture previously captured with capturePicture()
      * or captureSnapshot() is ready to be shown or saved.
@@ -169,14 +168,20 @@ camera.addCameraListener(new CameraListener() {
     @Override
     public void onPictureTaken(byte[] picture) {}
 
-
     /**
      * Notifies that a video capture has just ended. The file parameter is the one that
      * was passed to startCapturingVideo(File), or a fallback video file.
      */
     @Override
     public void onVideoTaken(File video) {}
-
+    
+    /**
+     * Notifies that the device was tilted or the window offset changed.
+     * The orientation passed can be used to align views (e.g. buttons) to the current
+     * camera viewport so they will appear correctly oriented to the user.
+     */
+    @Override
+    public void onOrientationChanged(int orientation) 
 
     /**
      * Notifies that user interacted with the screen and started focus with a gesture,
@@ -186,7 +191,6 @@ camera.addCameraListener(new CameraListener() {
     @Override
     public void onFocusStart(PointF point) {}
     
-    
     /**
      * Notifies that a gesture focus event just ended, and the camera converged
      * to a new focus (and possibly exposure and white balance).
@@ -194,7 +198,6 @@ camera.addCameraListener(new CameraListener() {
     @Override
     public void onFocusEnd(boolean successful, PointF point) {}
     
-    
     /**
      * Noitifies that a finger gesture just caused the camera zoom
      * to be changed. This can be used, for example, to draw a seek bar.
@@ -202,7 +205,6 @@ camera.addCameraListener(new CameraListener() {
     @Override
     public void onZoomChanged(float newValue, float[] bounds, PointF[] fingers) {}
     
-    
     /**
      * Noitifies that a finger gesture just caused the camera exposure correction
      * to be changed. This can be used, for example, to draw a seek bar.
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraListener.java b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraListener.java
index bbc76484..de521fd3 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraListener.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraListener.java
@@ -1,6 +1,7 @@
 package com.otaliastudios.cameraview;
 
 import android.graphics.PointF;
+import android.support.annotation.UiThread;
 
 import java.io.File;
 
@@ -13,6 +14,7 @@ public abstract class CameraListener {
      *
      * @param options camera supported options
      */
+    @UiThread
     public void onCameraOpened(CameraOptions options) {
 
     }
@@ -21,6 +23,7 @@ public abstract class CameraListener {
     /**
      * Notifies that the camera session was closed.
      */
+    @UiThread
     public void onCameraClosed() {
 
     }
@@ -35,6 +38,7 @@ public abstract class CameraListener {
      *
      * @param jpeg captured picture
      */
+    @UiThread
     public void onPictureTaken(byte[] jpeg) {
 
     }
@@ -50,11 +54,28 @@ public abstract class CameraListener {
      *
      * @param video file hosting the mp4 video
      */
+    @UiThread
     public void onVideoTaken(File video) {
 
     }
 
 
+    /**
+     * Notifies that the device was tilted or the window offset changed.
+     * The orientation passed is exactly the rotation that a View should have,
+     * in order to appear correctly oriented to the user, considering the way she is
+     * holding the device, and the native activity orientation.
+     *
+     * This is meant to be used for aligning views (e.g. buttons) to the current camera viewport.
+     *
+     * @param orientation either 0, 90, 180 or 270
+     */
+    @UiThread
+    public void onOrientationChanged(int orientation) {
+
+    }
+
+
     /**
      * Notifies that user interacted with the screen and started focus with a gesture,
      * and the autofocus is trying to focus around that area.
@@ -62,6 +83,7 @@ public abstract class CameraListener {
      *
      * @param point coordinates with respect to CameraView.getWidth() and CameraView.getHeight()
      */
+    @UiThread
     public void onFocusStart(PointF point) {
 
     }
@@ -75,6 +97,7 @@ public abstract class CameraListener {
      * @param successful whether camera succeeded
      * @param point coordinates with respect to CameraView.getWidth() and CameraView.getHeight()
      */
+    @UiThread
     public void onFocusEnd(boolean successful, PointF point) {
 
     }
@@ -88,6 +111,7 @@ public abstract class CameraListener {
      * @param bounds min and max bounds for newValue (fixed to 0 ... 1)
      * @param fingers finger positions that caused the event
      */
+    @UiThread
     public void onZoomChanged(float newValue, float[] bounds, PointF[] fingers) {
 
     }
@@ -101,6 +125,7 @@ public abstract class CameraListener {
      * @param bounds min and max bounds for newValue, as returned by {@link CameraOptions}
      * @param fingers finger positions that caused the event
      */
+    @UiThread
     public void onExposureCorrectionChanged(float newValue, float[] bounds, PointF[] fingers) {
 
     }
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
index 4bd9714d..35775897 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
@@ -140,16 +140,31 @@ public class CameraView extends FrameLayout {
 
         if (!isInEditMode()) {
             mOrientationHelper = new OrientationHelper(context) {
+
+                private Integer mDisplayOffset;
+                private Integer mDeviceOrientation;
+
                 @Override
                 public void onDisplayOffsetChanged(int displayOffset) {
                     mCameraController.onDisplayOffset(displayOffset);
                     mPreviewImpl.onDisplayOffset(displayOffset);
+                    mDisplayOffset = displayOffset;
+                    send();
                 }
 
                 @Override
                 protected void onDeviceOrientationChanged(int deviceOrientation) {
                     mCameraController.onDeviceOrientation(deviceOrientation);
                     mPreviewImpl.onDeviceOrientation(deviceOrientation);
+                    mDeviceOrientation = deviceOrientation;
+                    send();
+                }
+
+                private void send() {
+                    if (mDeviceOrientation == null) return;
+                    if (mDisplayOffset == null) return;
+                    int value = (mDeviceOrientation + mDisplayOffset) % 360;
+                    mCameraCallbacks.dispatchOnOrientationChanged(value);
                 }
             };
         }
@@ -1286,6 +1301,18 @@ public class CameraView extends FrameLayout {
         }
 
 
+        public void dispatchOnOrientationChanged(final int value) {
+            uiHandler.post(new Runnable() {
+                @Override
+                public void run() {
+                    for (CameraListener listener : mListeners) {
+                        listener.onOrientationChanged(value);
+                    }
+                }
+            });
+        }
+
+
         public void dispatchOnZoomChanged(final float newValue, final PointF[] fingers) {
             uiHandler.post(new Runnable() {
                 @Override