diff --git a/core/jni/android_app_NativeActivity.cpp b/core/jni/android_app_NativeActivity.cpp
index 0932473..2517a8a 100644
--- a/core/jni/android_app_NativeActivity.cpp
+++ b/core/jni/android_app_NativeActivity.cpp
@@ -127,12 +127,13 @@
     close(mDispatchKeyWrite);
 }
 
-void AInputQueue::attachLooper(ALooper* looper, ALooper_callbackFunc* callback, void* data) {
+void AInputQueue::attachLooper(ALooper* looper, int ident,
+        ALooper_callbackFunc* callback, void* data) {
     mPollLoop = static_cast<android::PollLoop*>(looper);
     mPollLoop->setLooperCallback(mConsumer.getChannel()->getReceivePipeFd(),
-            POLLIN, callback, data);
+            ident, POLLIN, callback, data);
     mPollLoop->setLooperCallback(mDispatchKeyRead,
-            POLLIN, callback, data);
+            ident, POLLIN, callback, data);
 }
 
 void AInputQueue::detachLooper() {
diff --git a/include/android_runtime/android_app_NativeActivity.h b/include/android_runtime/android_app_NativeActivity.h
index c388ba8..fdceb84 100644
--- a/include/android_runtime/android_app_NativeActivity.h
+++ b/include/android_runtime/android_app_NativeActivity.h
@@ -69,7 +69,7 @@
     /* Destroys the consumer and releases its input channel. */
     ~AInputQueue();
 
-    void attachLooper(ALooper* looper, ALooper_callbackFunc* callback, void* data);
+    void attachLooper(ALooper* looper, int ident, ALooper_callbackFunc* callback, void* data);
 
     void detachLooper();
 
diff --git a/include/utils/PollLoop.h b/include/utils/PollLoop.h
index 81230e8..bc616eb 100644
--- a/include/utils/PollLoop.h
+++ b/include/utils/PollLoop.h
@@ -111,12 +111,18 @@
      * This method can be called on any thread.
      * This method may block briefly if it needs to wake the poll loop.
      */
-    void setCallback(int fd, int events, Callback callback, void* data = NULL);
+    void setCallback(int fd, int ident, int events, Callback callback, void* data = NULL);
 
     /**
+     * Convenience for above setCallback when ident is not used.  In this case
+     * the ident is set to POLL_CALLBACK.
+     */
+    void setCallback(int fd, int events, Callback callback, void* data = NULL);
+    
+    /**
      * Like setCallback(), but for the NDK callback function.
      */
-    void setLooperCallback(int fd, int events, ALooper_callbackFunc* callback,
+    void setLooperCallback(int fd, int ident, int events, ALooper_callbackFunc* callback,
             void* data);
     
     /**
@@ -153,11 +159,13 @@
     struct RequestedCallback {
         Callback callback;
         ALooper_callbackFunc* looperCallback;
+        int ident;
         void* data;
     };
 
     struct PendingCallback {
         int fd;
+        int ident;
         int events;
         Callback callback;
         ALooper_callbackFunc* looperCallback;
@@ -185,7 +193,7 @@
     void openWakePipe();
     void closeWakePipe();
 
-    void setCallbackCommon(int fd, int events, Callback callback,
+    void setCallbackCommon(int fd, int ident, int events, Callback callback,
             ALooper_callbackFunc* looperCallback, void* data);
     ssize_t getRequestIndexLocked(int fd);
     void wakeAndLock();
diff --git a/libs/gui/SensorEventQueue.cpp b/libs/gui/SensorEventQueue.cpp
index 3396f25..7eb6da5 100644
--- a/libs/gui/SensorEventQueue.cpp
+++ b/libs/gui/SensorEventQueue.cpp
@@ -86,7 +86,7 @@
     Mutex::Autolock _l(mLock);
     if (mPollLoop == 0) {
         mPollLoop = new PollLoop(true);
-        mPollLoop->setCallback(getFd(), POLLIN, NULL, NULL);
+        mPollLoop->setCallback(getFd(), getFd(), POLLIN, NULL, NULL);
     }
     return mPollLoop;
 }
diff --git a/libs/utils/PollLoop.cpp b/libs/utils/PollLoop.cpp
index f740fa0..6d3eeee 100644
--- a/libs/utils/PollLoop.cpp
+++ b/libs/utils/PollLoop.cpp
@@ -95,6 +95,7 @@
     RequestedCallback requestedCallback;
     requestedCallback.callback = NULL;
     requestedCallback.looperCallback = NULL;
+    requestedCallback.ident = 0;
     requestedCallback.data = NULL;
     mRequestedCallbacks.insertAt(requestedCallback, 0);
 }
@@ -116,7 +117,7 @@
         mPendingFdsPos++;
         if (outEvents != NULL) *outEvents = pending.events;
         if (outData != NULL) *outData = pending.data;
-        return pending.fd;
+        return pending.ident;
     }
     
     mLock.lock();
@@ -182,6 +183,7 @@
             const RequestedCallback& requestedCallback = mRequestedCallbacks.itemAt(i);
             PendingCallback pending;
             pending.fd = requestedFd.fd;
+            pending.ident = requestedCallback.ident;
             pending.events = revents;
             pending.callback = requestedCallback.callback;
             pending.looperCallback = requestedCallback.looperCallback;
@@ -191,7 +193,7 @@
                 mPendingCallbacks.push(pending);
             } else if (pending.fd != mWakeReadPipeFd) {
                 if (result == POLL_CALLBACK) {
-                    result = pending.fd;
+                    result = pending.ident;
                     if (outEvents != NULL) *outEvents = pending.events;
                     if (outData != NULL) *outData = pending.data;
                 } else {
@@ -268,16 +270,20 @@
     return mAllowNonCallbacks;
 }
 
+void PollLoop::setCallback(int fd, int ident, int events, Callback callback, void* data) {
+    setCallbackCommon(fd, ident, events, callback, NULL, data);
+}
+
 void PollLoop::setCallback(int fd, int events, Callback callback, void* data) {
-    setCallbackCommon(fd, events, callback, NULL, data);
+    setCallbackCommon(fd, POLL_CALLBACK, events, callback, NULL, data);
 }
 
-void PollLoop::setLooperCallback(int fd, int events, ALooper_callbackFunc* callback,
+void PollLoop::setLooperCallback(int fd, int ident, int events, ALooper_callbackFunc* callback,
         void* data) {
-    setCallbackCommon(fd, events, NULL, callback, data);
+    setCallbackCommon(fd, ident, events, NULL, callback, data);
 }
 
-void PollLoop::setCallbackCommon(int fd, int events, Callback callback,
+void PollLoop::setCallbackCommon(int fd, int ident, int events, Callback callback,
         ALooper_callbackFunc* looperCallback, void* data) {
 
 #if DEBUG_CALLBACKS
@@ -305,6 +311,7 @@
     RequestedCallback requestedCallback;
     requestedCallback.callback = callback;
     requestedCallback.looperCallback = looperCallback;
+    requestedCallback.ident = ident;
     requestedCallback.data = data;
 
     ssize_t index = getRequestIndexLocked(fd);
diff --git a/native/android/input.cpp b/native/android/input.cpp
index 379960a..c79f913 100644
--- a/native/android/input.cpp
+++ b/native/android/input.cpp
@@ -246,8 +246,8 @@
 
 
 void AInputQueue_attachLooper(AInputQueue* queue, ALooper* looper,
-        ALooper_callbackFunc* callback, void* data) {
-    queue->attachLooper(looper, callback, data);
+        int ident, ALooper_callbackFunc* callback, void* data) {
+    queue->attachLooper(looper, ident, callback, data);
 }
 
 void AInputQueue_detachLooper(AInputQueue* queue) {
diff --git a/native/android/looper.cpp b/native/android/looper.cpp
index 1564c47..0aeed77 100644
--- a/native/android/looper.cpp
+++ b/native/android/looper.cpp
@@ -72,9 +72,9 @@
     static_cast<PollLoop*>(looper)->decStrong((void*)ALooper_acquire);
 }
 
-void ALooper_addFd(ALooper* looper, int fd, int events,
+void ALooper_addFd(ALooper* looper, int fd, int ident, int events,
         ALooper_callbackFunc* callback, void* data) {
-    static_cast<PollLoop*>(looper)->setLooperCallback(fd, events, callback, data);
+    static_cast<PollLoop*>(looper)->setLooperCallback(fd, ident, events, callback, data);
 }
 
 int32_t ALooper_removeFd(ALooper* looper, int fd) {
diff --git a/native/android/sensor.cpp b/native/android/sensor.cpp
index db534e0..cf7635d 100644
--- a/native/android/sensor.cpp
+++ b/native/android/sensor.cpp
@@ -60,12 +60,12 @@
 }
 
 ASensorEventQueue* ASensorManager_createEventQueue(ASensorManager* manager,
-        ALooper* looper, ALooper_callbackFunc* callback, void* data)
+        ALooper* looper, int ident, ALooper_callbackFunc* callback, void* data)
 {
     sp<SensorEventQueue> queue =
             static_cast<SensorManager*>(manager)->createEventQueue();
     if (queue != 0) {
-        ALooper_addFd(looper, queue->getFd(), POLLIN, callback, data);
+        ALooper_addFd(looper, queue->getFd(), ident, POLLIN, callback, data);
         queue->looper = looper;
         queue->incStrong(manager);
     }
diff --git a/native/include/android/input.h b/native/include/android/input.h
index 418f609..5b62da4 100644
--- a/native/include/android/input.h
+++ b/native/include/android/input.h
@@ -623,10 +623,10 @@
 
 /*
  * Add this input queue to a looper for processing.  See
- * ALooper_addFd() for information on the callback and data params.
+ * ALooper_addFd() for information on the ident, callback, and data params.
  */
 void AInputQueue_attachLooper(AInputQueue* queue, ALooper* looper,
-        ALooper_callbackFunc* callback, void* data);
+        int ident, ALooper_callbackFunc* callback, void* data);
 
 /*
  * Remove the input queue from the looper it is currently attached to.
diff --git a/native/include/android/looper.h b/native/include/android/looper.h
index 2917216..287bcd5 100644
--- a/native/include/android/looper.h
+++ b/native/include/android/looper.h
@@ -111,7 +111,7 @@
  *
  * Returns ALOPER_POLL_ERROR if an error occurred.
  *
- * Returns a value >= 0 containing a file descriptor if it has data
+ * Returns a value >= 0 containing an identifier if its file descriptor has data
  * and it has no callback function (requiring the caller here to handle it).
  * In this (and only this) case outEvents and outData will contain the poll
  * events and data associated with the fd.
@@ -145,10 +145,12 @@
  * descriptor was previously added, it is replaced.
  *
  * "fd" is the file descriptor to be added.
+ * "ident" is an identifier for this event, which is returned from
+ * ALooper_pollOnce().  Must be >= 0, or ALOOPER_POLL_CALLBACK if
+ * providing a non-NULL callback.
  * "events" are the poll events to wake up on.  Typically this is POLLIN.
  * "callback" is the function to call when there is an event on the file
  * descriptor.
- * "id" is an identifier to associated with this file descriptor, or 0.
  * "data" is a private data pointer to supply to the callback.
  *
  * There are two main uses of this function:
@@ -156,13 +158,13 @@
  * (1) If "callback" is non-NULL, then
  * this function will be called when there is data on the file descriptor.  It
  * should execute any events it has pending, appropriately reading from the
- * file descriptor.
+ * file descriptor.  The 'ident' is ignored in this case.
  *
- * (2) If "callback" is NULL, the fd will be returned by ALooper_pollOnce
- * when it has data available, requiring the caller to take care of processing
- * it.
+ * (2) If "callback" is NULL, the 'ident' will be returned by ALooper_pollOnce
+ * when its file descriptor has data available, requiring the caller to take
+ * care of processing it.
  */
-void ALooper_addFd(ALooper* looper, int fd, int events,
+void ALooper_addFd(ALooper* looper, int fd, int ident, int events,
         ALooper_callbackFunc* callback, void* data);
 
 /**
diff --git a/native/include/android/sensor.h b/native/include/android/sensor.h
index b4ce024..a102d43 100644
--- a/native/include/android/sensor.h
+++ b/native/include/android/sensor.h
@@ -166,7 +166,7 @@
  * Creates a new sensor event queue and associate it with a looper.
  */
 ASensorEventQueue* ASensorManager_createEventQueue(ASensorManager* manager,
-        ALooper* looper, ALooper_callbackFunc* callback, void* data);
+        ALooper* looper, int ident, ALooper_callbackFunc* callback, void* data);
 
 /*
  * Destroys the event queue and free all resources associated to it.