diff --git a/libs/binder/IUidObserver.cpp b/libs/binder/IUidObserver.cpp
new file mode 100644
index 0000000..697e948
--- /dev/null
+++ b/libs/binder/IUidObserver.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <binder/IUidObserver.h>
+
+#include <binder/Parcel.h>
+
+namespace android {
+
+// ------------------------------------------------------------------------------------
+
+class BpUidObserver : public BpInterface<IUidObserver>
+{
+public:
+    explicit BpUidObserver(const sp<IBinder>& impl)
+        : BpInterface<IUidObserver>(impl)
+    {
+    }
+
+    virtual void onUidGone(uid_t uid, bool disabled)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IUidObserver::getInterfaceDescriptor());
+        data.writeInt32((int32_t) uid);
+        data.writeInt32(disabled ? 1 : 0);
+        remote()->transact(ON_UID_GONE_TRANSACTION, data, &reply, IBinder::FLAG_ONEWAY);
+    }
+
+    virtual void onUidActive(uid_t uid)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IUidObserver::getInterfaceDescriptor());
+        data.writeInt32((int32_t) uid);
+        remote()->transact(ON_UID_ACTIVE_TRANSACTION, data, &reply, IBinder::FLAG_ONEWAY);
+    }
+
+    virtual void onUidIdle(uid_t uid, bool disabled)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IUidObserver::getInterfaceDescriptor());
+        data.writeInt32((int32_t) uid);
+        data.writeInt32(disabled ? 1 : 0);
+        remote()->transact(ON_UID_IDLE_TRANSACTION, data, &reply, IBinder::FLAG_ONEWAY);
+    }
+};
+
+// ----------------------------------------------------------------------
+
+IMPLEMENT_META_INTERFACE(UidObserver, "android.app.IUidObserver");
+
+// ----------------------------------------------------------------------
+
+status_t BnUidObserver::onTransact(
+    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
+{
+    switch(code) {
+        case ON_UID_GONE_TRANSACTION: {
+            CHECK_INTERFACE(IUidObserver, data, reply);
+            uid_t uid = data.readInt32();
+            bool disabled = data.readInt32() == 1;
+            onUidGone(uid, disabled);
+            return NO_ERROR;
+        } break;
+
+        case ON_UID_ACTIVE_TRANSACTION: {
+            CHECK_INTERFACE(IUidObserver, data, reply);
+            uid_t uid = data.readInt32();
+            onUidActive(uid);
+            return NO_ERROR;
+        } break;
+
+        case ON_UID_IDLE_TRANSACTION: {
+            CHECK_INTERFACE(IUidObserver, data, reply);
+            uid_t uid = data.readInt32();
+            bool disabled = data.readInt32() == 1;
+            onUidIdle(uid, disabled);
+            return NO_ERROR;
+        } break;
+        default:
+            return BBinder::onTransact(code, data, reply, flags);
+    }
+}
+
+}; // namespace android