diff --git a/libs/binder/ActivityManager.cpp b/libs/binder/ActivityManager.cpp
index 727ea60..e45a656 100644
--- a/libs/binder/ActivityManager.cpp
+++ b/libs/binder/ActivityManager.cpp
@@ -62,23 +62,27 @@
     return service != nullptr ? service->openContentUri(stringUri) : -1;
 }
 
-void ActivityManager::registerUidObserver(const sp<IUidObserver>& observer,
+status_t ActivityManager::registerUidObserver(const sp<IUidObserver>& observer,
                                           const int32_t event,
                                           const int32_t cutpoint,
                                           const String16& callingPackage)
 {
     sp<IActivityManager> service = getService();
     if (service != nullptr) {
-        service->registerUidObserver(observer, event, cutpoint, callingPackage);
+        return service->registerUidObserver(observer, event, cutpoint, callingPackage);
     }
+    // ActivityManagerService appears dead. Return usual error code for dead service.
+    return DEAD_OBJECT;
 }
 
-void ActivityManager::unregisterUidObserver(const sp<IUidObserver>& observer)
+status_t ActivityManager::unregisterUidObserver(const sp<IUidObserver>& observer)
 {
     sp<IActivityManager> service = getService();
     if (service != nullptr) {
-        service->unregisterUidObserver(observer);
+        return service->unregisterUidObserver(observer);
     }
+    // ActivityManagerService appears dead. Return usual error code for dead service.
+    return DEAD_OBJECT;
 }
 
 bool ActivityManager::isUidActive(const uid_t uid, const String16& callingPackage)
diff --git a/libs/binder/IActivityManager.cpp b/libs/binder/IActivityManager.cpp
index e9f5aae..cf9bb46 100644
--- a/libs/binder/IActivityManager.cpp
+++ b/libs/binder/IActivityManager.cpp
@@ -59,7 +59,7 @@
         return fd;
     }
 
-    virtual void registerUidObserver(const sp<IUidObserver>& observer,
+    virtual status_t registerUidObserver(const sp<IUidObserver>& observer,
                                      const int32_t event,
                                      const int32_t cutpoint,
                                      const String16& callingPackage)
@@ -70,15 +70,23 @@
          data.writeInt32(event);
          data.writeInt32(cutpoint);
          data.writeString16(callingPackage);
-         remote()->transact(REGISTER_UID_OBSERVER_TRANSACTION, data, &reply);
+         status_t err = remote()->transact(REGISTER_UID_OBSERVER_TRANSACTION, data, &reply);
+         if (err != NO_ERROR || ((err = reply.readExceptionCode()) != NO_ERROR)) {
+             return err;
+         }
+         return OK;
     }
 
-    virtual void unregisterUidObserver(const sp<IUidObserver>& observer)
+    virtual status_t unregisterUidObserver(const sp<IUidObserver>& observer)
     {
          Parcel data, reply;
          data.writeInterfaceToken(IActivityManager::getInterfaceDescriptor());
          data.writeStrongBinder(IInterface::asBinder(observer));
-         remote()->transact(UNREGISTER_UID_OBSERVER_TRANSACTION, data, &reply);
+         status_t err = remote()->transact(UNREGISTER_UID_OBSERVER_TRANSACTION, data, &reply);
+         if (err != NO_ERROR || ((err = reply.readExceptionCode()) != NO_ERROR)) {
+             return err;
+         }
+         return OK;
     }
 
     virtual bool isUidActive(const uid_t uid, const String16& callingPackage)
diff --git a/libs/binder/include/binder/ActivityManager.h b/libs/binder/include/binder/ActivityManager.h
index 0240858..830971b 100644
--- a/libs/binder/include/binder/ActivityManager.h
+++ b/libs/binder/include/binder/ActivityManager.h
@@ -74,11 +74,11 @@
     ActivityManager();
 
     int openContentUri(const String16& stringUri);
-    void registerUidObserver(const sp<IUidObserver>& observer,
+    status_t registerUidObserver(const sp<IUidObserver>& observer,
                              const int32_t event,
                              const int32_t cutpoint,
                              const String16& callingPackage);
-    void unregisterUidObserver(const sp<IUidObserver>& observer);
+    status_t unregisterUidObserver(const sp<IUidObserver>& observer);
     bool isUidActive(const uid_t uid, const String16& callingPackage);
     int getUidProcessState(const uid_t uid, const String16& callingPackage);
     status_t checkPermission(const String16& permission, const pid_t pid, const uid_t uid, int32_t* outResult);
diff --git a/libs/binder/include/binder/IActivityManager.h b/libs/binder/include/binder/IActivityManager.h
index e2081ff..2d58c46 100644
--- a/libs/binder/include/binder/IActivityManager.h
+++ b/libs/binder/include/binder/IActivityManager.h
@@ -31,11 +31,11 @@
     DECLARE_META_INTERFACE(ActivityManager)
 
     virtual int openContentUri(const String16& stringUri) = 0;
-    virtual void registerUidObserver(const sp<IUidObserver>& observer,
+    virtual status_t registerUidObserver(const sp<IUidObserver>& observer,
                                      const int32_t event,
                                      const int32_t cutpoint,
                                      const String16& callingPackage) = 0;
-    virtual void unregisterUidObserver(const sp<IUidObserver>& observer) = 0;
+    virtual status_t unregisterUidObserver(const sp<IUidObserver>& observer) = 0;
     virtual bool isUidActive(const uid_t uid, const String16& callingPackage) = 0;
     virtual int32_t getUidProcessState(const uid_t uid, const String16& callingPackage) = 0;
     virtual status_t checkPermission(const String16& permission,