diff --git a/core/jni/android_hardware_location_ActivityRecognitionHardware.cpp b/core/jni/android_hardware_location_ActivityRecognitionHardware.cpp
index 4b279f63..b23757e 100644
--- a/core/jni/android_hardware_location_ActivityRecognitionHardware.cpp
+++ b/core/jni/android_hardware_location_ActivityRecognitionHardware.cpp
@@ -22,256 +22,89 @@
 #include <android_runtime/AndroidRuntime.h>
 #include <android_runtime/Log.h>
 
-#include "activity_recognition.h"
-
-
-// keep base connection data from the HAL
-static activity_recognition_module_t* sModule = NULL;
-static activity_recognition_device_t* sDevice = NULL;
-
-static jobject sCallbacksObject = NULL;
-static jmethodID sOnActivityChanged = NULL;
-
-
-static void check_and_clear_exceptions(JNIEnv* env, const char* method_name) {
-    if (!env->ExceptionCheck()) {
-        return;
-    }
-
-    ALOGE("An exception was thrown by '%s'.", method_name);
-    LOGE_EX(env);
-    env->ExceptionClear();
-}
-
-static jint attach_thread(JNIEnv** env) {
-    JavaVM* java_vm = android::AndroidRuntime::getJavaVM();
-    assert(java_vm != NULL);
-
-    JavaVMAttachArgs args = {
-        JNI_VERSION_1_6,
-        "ActivityRecognition HAL callback.",
-        NULL /* group */
-    };
-
-    jint result = java_vm->AttachCurrentThread(env, &args);
-    if (result != JNI_OK) {
-        ALOGE("Attach to callback thread failed: %d", result);
-    }
-
-    return result;
-}
-
-static jint detach_thread() {
-    JavaVM* java_vm = android::AndroidRuntime::getJavaVM();
-    assert(java_vm != NULL);
-
-    jint result = java_vm->DetachCurrentThread();
-    if (result != JNI_OK) {
-        ALOGE("Detach of callback thread failed: %d", result);
-    }
-
-    return result;
-}
-
-
-/**
- * Handle activity recognition events from HAL.
- */
-static void activity_callback(
-        const activity_recognition_callback_procs_t* procs,
-        const activity_event_t* events,
-        int count) {
-    if (sOnActivityChanged == NULL) {
-        ALOGE("Dropping activity_callback because onActivityChanged handler is null.");
-        return;
-    }
-
-    if (events == NULL || count <= 0) {
-        ALOGE("Invalid activity_callback. Count: %d, Events: %p", count, events);
-        return;
-    }
-
-    JNIEnv* env = NULL;
-    int result = attach_thread(&env);
-    if (result != JNI_OK) {
-        ALOGE("Unable to attach thread with JNI.");
-        return;
-    }
-
-    jclass event_class =
-            env->FindClass("android/hardware/location/ActivityRecognitionHardware$Event");
-    jmethodID event_ctor = env->GetMethodID(event_class, "<init>", "()V");
-    jfieldID activity_field = env->GetFieldID(event_class, "activity", "I");
-    jfieldID type_field = env->GetFieldID(event_class, "type", "I");
-    jfieldID timestamp_field = env->GetFieldID(event_class, "timestamp", "J");
-
-    jobjectArray events_array = env->NewObjectArray(count, event_class, NULL);
-    for (int i = 0; i < count; ++i) {
-        const activity_event_t* event = &events[i];
-        jobject event_object = env->NewObject(event_class, event_ctor);
-        env->SetIntField(event_object, activity_field, event->activity);
-        env->SetIntField(event_object, type_field, event->event_type);
-        env->SetLongField(event_object, timestamp_field, event->timestamp);
-        env->SetObjectArrayElement(events_array, i, event_object);
-        env->DeleteLocalRef(event_object);
-    }
-
-    env->CallVoidMethod(sCallbacksObject, sOnActivityChanged, events_array);
-    check_and_clear_exceptions(env, __FUNCTION__);
-
-    // TODO: ideally we'd let the HAL register the callback thread only once
-    detach_thread();
-}
-
-activity_recognition_callback_procs_t sCallbacks = {
-    activity_callback,
-};
+// #include "activity_recognition.h"
+// The activity recognition HAL is being deprecated. This means -
+//    i) Android framework code shall not depend on activity recognition
+//       being provided through the activity_recognition.h interface.
+//   ii) activity recognition HAL will not be binderized as the other HALs.
+//
 
 /**
  * Initializes the ActivityRecognitionHardware class from the native side.
  */
-static void class_init(JNIEnv* env, jclass clazz) {
-    // open the hardware module
-    int error = hw_get_module(
-            ACTIVITY_RECOGNITION_HARDWARE_MODULE_ID,
-            (const hw_module_t**) &sModule);
-    if (error != 0) {
-        ALOGE("Error hw_get_module: %d", error);
-        return;
-    }
-
-    error = activity_recognition_open(&sModule->common, &sDevice);
-    if (error != 0) {
-        ALOGE("Error opening device: %d", error);
-        return;
-    }
-
-    // get references to the Java provided methods
-    sOnActivityChanged = env->GetMethodID(
-            clazz,
-            "onActivityChanged",
-            "([Landroid/hardware/location/ActivityRecognitionHardware$Event;)V");
-    if (sOnActivityChanged == NULL) {
-        ALOGE("Error obtaining ActivityChanged callback.");
-        return;
-    }
-
-    // register callbacks
-    sDevice->register_activity_callback(sDevice, &sCallbacks);
+static void class_init(JNIEnv* /*env*/, jclass /*clazz*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
 }
 
 /**
  * Initializes and connect the callbacks handlers in the HAL.
  */
-static void initialize(JNIEnv* env, jobject obj) {
-    if (sCallbacksObject == NULL) {
-        sCallbacksObject = env->NewGlobalRef(obj);
-    } else {
-        ALOGD("Callbacks Object was already initialized.");
-    }
-
-    if (sDevice != NULL) {
-        sDevice->register_activity_callback(sDevice, &sCallbacks);
-    } else {
-        ALOGD("ActivityRecognition device not found during initialization.");
-    }
+static void initialize(JNIEnv* /*env*/, jobject /*obj*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
 }
 
 /**
  * De-initializes the ActivityRecognitionHardware from the native side.
  */
-static void release(JNIEnv* env, jobject obj) {
-    if (sDevice == NULL) {
-        return;
-    }
-
-    int error = activity_recognition_close(sDevice);
-    if (error != 0) {
-        ALOGE("Error closing device: %d", error);
-        return;
-    }
+static void release(JNIEnv* /*env*/, jobject /*obj*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
 }
 
 /**
  * Returns true if ActivityRecognition HAL is supported, false otherwise.
  */
-static jboolean is_supported(JNIEnv* env, jclass clazz) {
-    if (sModule != NULL && sDevice != NULL ) {
-        return JNI_TRUE;
-    }
+static jboolean is_supported(JNIEnv* /*env*/, jclass /*clazz*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
     return JNI_FALSE;
 }
 
 /**
  * Gets an array representing the supported activities.
  */
-static jobjectArray get_supported_activities(JNIEnv* env, jobject obj) {
-    if (sModule == NULL) {
-        return NULL;
-    }
-
-    char const* const* list = NULL;
-    int list_size = sModule->get_supported_activities_list(sModule, &list);
-    if (list_size <= 0 || list == NULL) {
-        return NULL;
-    }
-
-    jclass string_class = env->FindClass("java/lang/String");
-    if (string_class == NULL) {
-        ALOGE("Unable to find String class for supported activities.");
-        return NULL;
-    }
-
-    jobjectArray string_array = env->NewObjectArray(list_size, string_class, NULL);
-    if (string_array == NULL) {
-        ALOGE("Unable to create string array for supported activities.");
-        return NULL;
-    }
-
-    for (int i = 0; i < list_size; ++i) {
-        const char* string_ptr = const_cast<const char*>(list[i]);
-        jstring string = env->NewStringUTF(string_ptr);
-        env->SetObjectArrayElement(string_array, i, string);
-    }
-
-    return string_array;
+static jobjectArray get_supported_activities(JNIEnv* /*env*/, jobject /*obj*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
+    return NULL;
 }
 
 /**
  * Enables a given activity event to be actively monitored.
  */
 static int enable_activity_event(
-        JNIEnv* env,
-        jobject obj,
-        jint activity_handle,
-        jint event_type,
-        jlong report_latency_ns) {
-    return sDevice->enable_activity_event(
-            sDevice,
-            (uint32_t) activity_handle,
-            (uint32_t) event_type,
-            report_latency_ns);
+        JNIEnv* /*env*/,
+        jobject /*obj*/,
+        jint /*activity_handle*/,
+        jint /*event_type*/,
+        jlong /*report_latency_ns*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
+    return android::NO_INIT;
 }
 
 /**
  * Disables a given activity event from being actively monitored.
  */
 static int disable_activity_event(
-        JNIEnv* env,
-        jobject obj,
-        jint activity_handle,
-        jint event_type) {
-    return sDevice->disable_activity_event(
-            sDevice,
-            (uint32_t) activity_handle,
-            (uint32_t) event_type);
+        JNIEnv* /*env*/,
+        jobject /*obj*/,
+        jint /*activity_handle*/,
+        jint /*event_type*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
+    return android::NO_INIT;
 }
 
 /**
  * Request flush for al batch buffers.
  */
-static int flush(JNIEnv* env, jobject obj) {
-    return sDevice->flush(sDevice);
+static int flush(JNIEnv* /*env*/, jobject /*obj*/) {
+    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",
+          __FUNCTION__);
+    return android::NO_INIT;
 }