core/jni/android_hardware_location_ActivityRecognitionHardware.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright 2014, 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.
  */

 #define LOG_TAG "ActivityRecognitionHardware"

 #include <jni.h>
 #include <JNIHelp.h>

 #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,
 };

 /**
  * 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);
 }

 /**
  * 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.");
     }
 }

 /**
  * 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;
     }
 }

 /**
  * 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;
     }
     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;
 }

 /**
  * 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);
 }

 /**
  * 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);
 }

 /**
  * Request flush for al batch buffers.
  */
 static int flush(JNIEnv* env, jobject obj) {
     return sDevice->flush(sDevice);
 }


 static const JNINativeMethod sMethods[] = {
     // {"name", "signature", (void*) functionPointer },
     { "nativeClassInit", "()V", (void*) class_init },
     { "nativeInitialize", "()V", (void*) initialize },
     { "nativeRelease", "()V", (void*) release },
     { "nativeIsSupported", "()Z", (void*) is_supported },
     { "nativeGetSupportedActivities", "()[Ljava/lang/String;", (void*) get_supported_activities },
     { "nativeEnableActivityEvent", "(IIJ)I", (void*) enable_activity_event },
     { "nativeDisableActivityEvent", "(II)I", (void*) disable_activity_event },
     { "nativeFlush", "()I", (void*) flush },
 };

 /**
  * Registration method invoked in JNI load.
  */
 int register_android_hardware_location_ActivityRecognitionHardware(JNIEnv* env) {
     return jniRegisterNativeMethods(
             env,
             "android/hardware/location/ActivityRecognitionHardware",
             sMethods,
             NELEM(sMethods));
 }
	/*
	* Copyright 2014, 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.
	*/

	#define LOG_TAG "ActivityRecognitionHardware"

	#include <jni.h>
	#include <JNIHelp.h>

	#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,
	};

	/**
	* 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);
	}

	/**
	* 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.");
	}
	}

	/**
	* 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;
	}
	}

	/**
	* 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;
	}
	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;
	}

	/**
	* 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);
	}

	/**
	* 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);
	}

	/**
	* Request flush for al batch buffers.
	*/
	static int flush(JNIEnv* env, jobject obj) {
	return sDevice->flush(sDevice);
	}


	static const JNINativeMethod sMethods[] = {
	// {"name", "signature", (void*) functionPointer },
	{ "nativeClassInit", "()V", (void*) class_init },
	{ "nativeInitialize", "()V", (void*) initialize },
	{ "nativeRelease", "()V", (void*) release },
	{ "nativeIsSupported", "()Z", (void*) is_supported },
	{ "nativeGetSupportedActivities", "()[Ljava/lang/String;", (void*) get_supported_activities },
	{ "nativeEnableActivityEvent", "(IIJ)I", (void*) enable_activity_event },
	{ "nativeDisableActivityEvent", "(II)I", (void*) disable_activity_event },
	{ "nativeFlush", "()I", (void*) flush },
	};

	/**
	* Registration method invoked in JNI load.
	*/
	int register_android_hardware_location_ActivityRecognitionHardware(JNIEnv* env) {
	return jniRegisterNativeMethods(
	env,
	"android/hardware/location/ActivityRecognitionHardware",
	sMethods,
	NELEM(sMethods));
	}