Deprecate the activity recognition HAL.

#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.");

static jobjectArray get_supported_activities(JNIEnv* /*env*/, jobject /*obj*/) {

    ALOGE("activity_recognition HAL is deprecated. %s is effectively a no-op",

          __FUNCTION__);

    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;

}

/**

 * 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;

}