diff --git a/media/libstagefright/MediaCodecList.cpp b/media/libstagefright/MediaCodecList.cpp
index eaff283..e8a4b20 100644
--- a/media/libstagefright/MediaCodecList.cpp
+++ b/media/libstagefright/MediaCodecList.cpp
@@ -165,6 +165,7 @@
 sp<IMediaCodecList> MediaCodecList::sRemoteList;
 
 sp<MediaCodecList::BinderDeathObserver> MediaCodecList::sBinderDeathObserver;
+sp<IBinder> MediaCodecList::sMediaPlayer;  // kept since linked to death
 
 void MediaCodecList::BinderDeathObserver::binderDied(const wp<IBinder> &who __unused) {
     Mutex::Autolock _l(sRemoteInitMutex);
@@ -176,15 +177,14 @@
 sp<IMediaCodecList> MediaCodecList::getInstance() {
     Mutex::Autolock _l(sRemoteInitMutex);
     if (sRemoteList == nullptr) {
-        sp<IBinder> binder =
-            defaultServiceManager()->getService(String16("media.player"));
+        sMediaPlayer = defaultServiceManager()->getService(String16("media.player"));
         sp<IMediaPlayerService> service =
-            interface_cast<IMediaPlayerService>(binder);
+            interface_cast<IMediaPlayerService>(sMediaPlayer);
         if (service.get() != nullptr) {
             sRemoteList = service->getCodecList();
             if (sRemoteList != nullptr) {
                 sBinderDeathObserver = new BinderDeathObserver();
-                binder->linkToDeath(sBinderDeathObserver.get());
+                sMediaPlayer->linkToDeath(sBinderDeathObserver.get());
             }
         }
         if (sRemoteList == nullptr) {
diff --git a/media/libstagefright/include/media/stagefright/MediaCodecList.h b/media/libstagefright/include/media/stagefright/MediaCodecList.h
index e44b0a4..e681d25 100644
--- a/media/libstagefright/include/media/stagefright/MediaCodecList.h
+++ b/media/libstagefright/include/media/stagefright/MediaCodecList.h
@@ -83,6 +83,7 @@
     };
 
     static sp<BinderDeathObserver> sBinderDeathObserver;
+    static sp<IBinder> sMediaPlayer;
 
     static sp<IMediaCodecList> sCodecList;
     static sp<IMediaCodecList> sRemoteList;
diff --git a/services/audiopolicy/service/AudioPolicyService.cpp b/services/audiopolicy/service/AudioPolicyService.cpp
index f3cddc3..56d7ff1 100644
--- a/services/audiopolicy/service/AudioPolicyService.cpp
+++ b/services/audiopolicy/service/AudioPolicyService.cpp
@@ -29,7 +29,6 @@
 #include <cutils/multiuser.h>
 #include <cutils/properties.h>
 #include <binder/IPCThreadState.h>
-#include <binder/ActivityManager.h>
 #include <binder/PermissionController.h>
 #include <binder/IResultReceiver.h>
 #include <utils/String16.h>
@@ -502,26 +501,24 @@
 // -----------  AudioPolicyService::UidPolicy implementation ----------
 
 void AudioPolicyService::UidPolicy::registerSelf() {
-    ActivityManager am;
-    am.registerUidObserver(this, ActivityManager::UID_OBSERVER_GONE
+    status_t res = mAm.linkToDeath(this);
+    mAm.registerUidObserver(this, ActivityManager::UID_OBSERVER_GONE
             | ActivityManager::UID_OBSERVER_IDLE
             | ActivityManager::UID_OBSERVER_ACTIVE,
             ActivityManager::PROCESS_STATE_UNKNOWN,
             String16("audioserver"));
-    status_t res = am.linkToDeath(this);
     if (!res) {
         Mutex::Autolock _l(mLock);
         mObserverRegistered = true;
     } else {
         ALOGE("UidPolicy::registerSelf linkToDeath failed: %d", res);
-        am.unregisterUidObserver(this);
+        mAm.unregisterUidObserver(this);
     }
 }
 
 void AudioPolicyService::UidPolicy::unregisterSelf() {
-    ActivityManager am;
-    am.unlinkToDeath(this);
-    am.unregisterUidObserver(this);
+    mAm.unlinkToDeath(this);
+    mAm.unregisterUidObserver(this);
     Mutex::Autolock _l(mLock);
     mObserverRegistered = false;
 }
diff --git a/services/audiopolicy/service/AudioPolicyService.h b/services/audiopolicy/service/AudioPolicyService.h
index 407d7a5..4713f2f 100644
--- a/services/audiopolicy/service/AudioPolicyService.h
+++ b/services/audiopolicy/service/AudioPolicyService.h
@@ -23,6 +23,7 @@
 #include <utils/String8.h>
 #include <utils/Vector.h>
 #include <utils/SortedVector.h>
+#include <binder/ActivityManager.h>
 #include <binder/BinderService.h>
 #include <binder/IUidObserver.h>
 #include <system/audio.h>
@@ -302,6 +303,7 @@
 
         wp<AudioPolicyService> mService;
         Mutex mLock;
+        ActivityManager mAm;
         bool mObserverRegistered;
         std::unordered_map<uid_t, bool> mOverrideUids;
         std::unordered_map<uid_t, bool> mCachedUids;
diff --git a/services/camera/libcameraservice/CameraService.cpp b/services/camera/libcameraservice/CameraService.cpp
index 8a752b1..c456b1f 100644
--- a/services/camera/libcameraservice/CameraService.cpp
+++ b/services/camera/libcameraservice/CameraService.cpp
@@ -2395,14 +2395,13 @@
 void CameraService::UidPolicy::registerSelf() {
     Mutex::Autolock _l(mUidLock);
 
-    ActivityManager am;
     if (mRegistered) return;
-    am.registerUidObserver(this, ActivityManager::UID_OBSERVER_GONE
+    status_t res = mAm.linkToDeath(this);
+    mAm.registerUidObserver(this, ActivityManager::UID_OBSERVER_GONE
             | ActivityManager::UID_OBSERVER_IDLE
             | ActivityManager::UID_OBSERVER_ACTIVE,
             ActivityManager::PROCESS_STATE_UNKNOWN,
             String16("cameraserver"));
-    status_t res = am.linkToDeath(this);
     if (res == OK) {
         mRegistered = true;
         ALOGV("UidPolicy: Registered with ActivityManager");
@@ -2412,9 +2411,8 @@
 void CameraService::UidPolicy::unregisterSelf() {
     Mutex::Autolock _l(mUidLock);
 
-    ActivityManager am;
-    am.unregisterUidObserver(this);
-    am.unlinkToDeath(this);
+    mAm.unregisterUidObserver(this);
+    mAm.unlinkToDeath(this);
     mRegistered = false;
     mActiveUids.clear();
     ALOGV("UidPolicy: Unregistered with ActivityManager");
diff --git a/services/camera/libcameraservice/CameraService.h b/services/camera/libcameraservice/CameraService.h
index 991c770..602be13 100644
--- a/services/camera/libcameraservice/CameraService.h
+++ b/services/camera/libcameraservice/CameraService.h
@@ -24,6 +24,7 @@
 #include <cutils/multiuser.h>
 #include <utils/Vector.h>
 #include <utils/KeyedVector.h>
+#include <binder/ActivityManager.h>
 #include <binder/AppOpsManager.h>
 #include <binder/BinderService.h>
 #include <binder/IAppOpsCallback.h>
@@ -543,6 +544,7 @@
 
         Mutex mUidLock;
         bool mRegistered;
+        ActivityManager mAm;
         wp<CameraService> mService;
         std::unordered_set<uid_t> mActiveUids;
         std::unordered_map<uid_t, bool> mOverrideUids;