diff --git a/api/current.txt b/api/current.txt
index 5779ed7511f8a..4f76159f35eca 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -12682,7 +12682,7 @@ package android.hardware.camera2 {
     method public void onCaptureProgressed(android.hardware.camera2.CameraCaptureSession, android.hardware.camera2.CaptureRequest, android.hardware.camera2.CaptureResult);
     method public void onCaptureSequenceAborted(android.hardware.camera2.CameraCaptureSession, int);
     method public void onCaptureSequenceCompleted(android.hardware.camera2.CameraCaptureSession, int, long);
-    method public void onCaptureStarted(android.hardware.camera2.CameraCaptureSession, android.hardware.camera2.CaptureRequest, long);
+    method public void onCaptureStarted(android.hardware.camera2.CameraCaptureSession, android.hardware.camera2.CaptureRequest, long, long);
   }
 
   public static abstract class CameraCaptureSession.StateCallback {
diff --git a/core/java/android/hardware/camera2/CameraCaptureSession.java b/core/java/android/hardware/camera2/CameraCaptureSession.java
index 29e42ea246b16..ce830288eed29 100644
--- a/core/java/android/hardware/camera2/CameraCaptureSession.java
+++ b/core/java/android/hardware/camera2/CameraCaptureSession.java
@@ -483,7 +483,9 @@ public abstract class CameraCaptureSession implements AutoCloseable {
          * and in the buffers sent to each output Surface. These buffer
          * timestamps are accessible through, for example,
          * {@link android.media.Image#getTimestamp() Image.getTimestamp()} or
-         * {@link android.graphics.SurfaceTexture#getTimestamp()}.</p>
+         * {@link android.graphics.SurfaceTexture#getTimestamp()}.
+         * The frame number included is equal to the frame number that will be included in
+         * {@link CaptureResult#getFrameNumber}.</p>
          *
          * <p>For the simplest way to play a shutter sound camera shutter or a
          * video recording start/stop sound, see the
@@ -494,9 +496,20 @@ public abstract class CameraCaptureSession implements AutoCloseable {
          * @param session the session returned by {@link CameraDevice#createCaptureSession}
          * @param request the request for the capture that just begun
          * @param timestamp the timestamp at start of capture, in nanoseconds.
+         * @param frameNumber the frame number for this capture
          *
          * @see android.media.MediaActionSound
          */
+        public void onCaptureStarted(CameraCaptureSession session,
+                CaptureRequest request, long timestamp, long frameNumber) {
+            // Temporary trampoline for API change transition
+            onCaptureStarted(session, request, timestamp);
+        }
+
+        /**
+         * Temporary for API change transition
+         * @hide
+         */
         public void onCaptureStarted(CameraCaptureSession session,
                 CaptureRequest request, long timestamp) {
             // default empty implementation
diff --git a/core/java/android/hardware/camera2/dispatch/MethodNameInvoker.java b/core/java/android/hardware/camera2/dispatch/MethodNameInvoker.java
index 02c3d87acf2ea..c66a3a40718f5 100644
--- a/core/java/android/hardware/camera2/dispatch/MethodNameInvoker.java
+++ b/core/java/android/hardware/camera2/dispatch/MethodNameInvoker.java
@@ -48,7 +48,8 @@ public class MethodNameInvoker<T> {
     /**
      * Invoke a method by its name.
      *
-     * <p>If more than one method exists in {@code targetClass}, the first method will be used.</p>
+     * <p>If more than one method exists in {@code targetClass}, the first method with the right
+     * number of arguments will be used, and later calls will all use that method.</p>
      *
      * @param methodName
      *          The name of the method, which will be matched 1:1 to the destination method
@@ -68,8 +69,9 @@ public class MethodNameInvoker<T> {
         Method targetMethod = mMethods.get(methodName);
         if (targetMethod == null) {
             for (Method method : mTargetClass.getMethods()) {
-                // TODO future: match by # of params and types of params if possible
-                if (method.getName().equals(methodName)) {
+                // TODO future: match types of params if possible
+                if (method.getName().equals(methodName) &&
+                        (params.length == method.getParameterTypes().length) ) {
                     targetMethod = method;
                     mMethods.put(methodName, targetMethod);
                     break;
diff --git a/core/java/android/hardware/camera2/impl/CallbackProxies.java b/core/java/android/hardware/camera2/impl/CallbackProxies.java
index e5ddb7a1a6077..f0217acc01169 100644
--- a/core/java/android/hardware/camera2/impl/CallbackProxies.java
+++ b/core/java/android/hardware/camera2/impl/CallbackProxies.java
@@ -98,8 +98,8 @@ public class CallbackProxies {
 
         @Override
         public void onCaptureStarted(CameraDevice camera,
-                CaptureRequest request, long timestamp) {
-            mProxy.invoke("onCaptureStarted", camera, request, timestamp);
+                CaptureRequest request, long timestamp, long frameNumber) {
+            mProxy.invoke("onCaptureStarted", camera, request, timestamp, frameNumber);
         }
 
         @Override
diff --git a/core/java/android/hardware/camera2/impl/CameraDeviceImpl.java b/core/java/android/hardware/camera2/impl/CameraDeviceImpl.java
index d454092a8633f..f011d60c0cb08 100644
--- a/core/java/android/hardware/camera2/impl/CameraDeviceImpl.java
+++ b/core/java/android/hardware/camera2/impl/CameraDeviceImpl.java
@@ -803,7 +803,7 @@ public class CameraDeviceImpl extends CameraDevice {
          * @see android.media.MediaActionSound
          */
         public void onCaptureStarted(CameraDevice camera,
-                CaptureRequest request, long timestamp) {
+                CaptureRequest request, long timestamp, long frameNumber) {
             // default empty implementation
         }
 
@@ -1237,8 +1237,10 @@ public class CameraDeviceImpl extends CameraDevice {
         @Override
         public void onCaptureStarted(final CaptureResultExtras resultExtras, final long timestamp) {
             int requestId = resultExtras.getRequestId();
+            final long frameNumber = resultExtras.getFrameNumber();
+
             if (DEBUG) {
-                Log.d(TAG, "Capture started for id " + requestId);
+                Log.d(TAG, "Capture started for id " + requestId + " frame number " + frameNumber);
             }
             final CaptureCallbackHolder holder;
 
@@ -1263,7 +1265,7 @@ public class CameraDeviceImpl extends CameraDevice {
                                 holder.getCallback().onCaptureStarted(
                                     CameraDeviceImpl.this,
                                     holder.getRequest(resultExtras.getSubsequenceId()),
-                                    timestamp);
+                                    timestamp, frameNumber);
                             }
                         }
                     });