1 /*
2 * Copyright 2014, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "ActivityRecognitionHardware"
18
19 #include <jni.h>
20 #include <JNIHelp.h>
21
22 #include <android_runtime/AndroidRuntime.h>
23 #include <android_runtime/Log.h>
24
25 #include "activity_recognition.h"
26
27
28 // keep base connection data from the HAL
29 static activity_recognition_module_t* sModule = NULL;
30 static activity_recognition_device_t* sDevice = NULL;
31
32 static jobject sCallbacksObject = NULL;
33 static jmethodID sOnActivityChanged = NULL;
34
35
check_and_clear_exceptions(JNIEnv * env,const char * method_name)36 static void check_and_clear_exceptions(JNIEnv* env, const char* method_name) {
37 if (!env->ExceptionCheck()) {
38 return;
39 }
40
41 ALOGE("An exception was thrown by '%s'.", method_name);
42 LOGE_EX(env);
43 env->ExceptionClear();
44 }
45
attach_thread(JNIEnv ** env)46 static jint attach_thread(JNIEnv** env) {
47 JavaVM* java_vm = android::AndroidRuntime::getJavaVM();
48 assert(java_vm != NULL);
49
50 JavaVMAttachArgs args = {
51 JNI_VERSION_1_6,
52 "ActivityRecognition HAL callback.",
53 NULL /* group */
54 };
55
56 jint result = java_vm->AttachCurrentThread(env, &args);
57 if (result != JNI_OK) {
58 ALOGE("Attach to callback thread failed: %d", result);
59 }
60
61 return result;
62 }
63
detach_thread()64 static jint detach_thread() {
65 JavaVM* java_vm = android::AndroidRuntime::getJavaVM();
66 assert(java_vm != NULL);
67
68 jint result = java_vm->DetachCurrentThread();
69 if (result != JNI_OK) {
70 ALOGE("Detach of callback thread failed: %d", result);
71 }
72
73 return result;
74 }
75
76
77 /**
78 * Handle activity recognition events from HAL.
79 */
activity_callback(const activity_recognition_callback_procs_t * procs,const activity_event_t * events,int count)80 static void activity_callback(
81 const activity_recognition_callback_procs_t* procs,
82 const activity_event_t* events,
83 int count) {
84 if (sOnActivityChanged == NULL) {
85 ALOGE("Dropping activity_callback because onActivityChanged handler is null.");
86 return;
87 }
88
89 if (events == NULL || count <= 0) {
90 ALOGE("Invalid activity_callback. Count: %d, Events: %p", count, events);
91 return;
92 }
93
94 JNIEnv* env = NULL;
95 int result = attach_thread(&env);
96 if (result != JNI_OK) {
97 ALOGE("Unable to attach thread with JNI.");
98 return;
99 }
100
101 jclass event_class =
102 env->FindClass("android/hardware/location/ActivityRecognitionHardware$Event");
103 jmethodID event_ctor = env->GetMethodID(event_class, "<init>", "()V");
104 jfieldID activity_field = env->GetFieldID(event_class, "activity", "I");
105 jfieldID type_field = env->GetFieldID(event_class, "type", "I");
106 jfieldID timestamp_field = env->GetFieldID(event_class, "timestamp", "J");
107
108 jobjectArray events_array = env->NewObjectArray(count, event_class, NULL);
109 for (int i = 0; i < count; ++i) {
110 const activity_event_t* event = &events[i];
111 jobject event_object = env->NewObject(event_class, event_ctor);
112 env->SetIntField(event_object, activity_field, event->activity);
113 env->SetIntField(event_object, type_field, event->event_type);
114 env->SetLongField(event_object, timestamp_field, event->timestamp);
115 env->SetObjectArrayElement(events_array, i, event_object);
116 env->DeleteLocalRef(event_object);
117 }
118
119 env->CallVoidMethod(sCallbacksObject, sOnActivityChanged, events_array);
120 check_and_clear_exceptions(env, __FUNCTION__);
121
122 // TODO: ideally we'd let the HAL register the callback thread only once
123 detach_thread();
124 }
125
126 activity_recognition_callback_procs_t sCallbacks {
127 activity_callback,
128 };
129
130 /**
131 * Initializes the ActivityRecognitionHardware class from the native side.
132 */
class_init(JNIEnv * env,jclass clazz)133 static void class_init(JNIEnv* env, jclass clazz) {
134 // open the hardware module
135 int error = hw_get_module(
136 ACTIVITY_RECOGNITION_HARDWARE_MODULE_ID,
137 (const hw_module_t**) &sModule);
138 if (error != 0) {
139 ALOGE("Error hw_get_module: %d", error);
140 return;
141 }
142
143 error = activity_recognition_open(&sModule->common, &sDevice);
144 if (error != 0) {
145 ALOGE("Error opening device: %d", error);
146 return;
147 }
148
149 // get references to the Java provided methods
150 sOnActivityChanged = env->GetMethodID(
151 clazz,
152 "onActivityChanged",
153 "([Landroid/hardware/location/ActivityRecognitionHardware$Event;)V");
154 if (sOnActivityChanged == NULL) {
155 ALOGE("Error obtaining ActivityChanged callback.");
156 return;
157 }
158
159 // register callbacks
160 sDevice->register_activity_callback(sDevice, &sCallbacks);
161 }
162
163 /**
164 * Initializes and connect the callbacks handlers in the HAL.
165 */
initialize(JNIEnv * env,jobject obj)166 static void initialize(JNIEnv* env, jobject obj) {
167 if (sCallbacksObject == NULL) {
168 sCallbacksObject = env->NewGlobalRef(obj);
169 } else {
170 ALOGD("Callbacks Object was already initialized.");
171 }
172
173 if (sDevice != NULL) {
174 sDevice->register_activity_callback(sDevice, &sCallbacks);
175 } else {
176 ALOGD("ActivityRecognition device not found during initialization.");
177 }
178 }
179
180 /**
181 * De-initializes the ActivityRecognitionHardware from the native side.
182 */
release(JNIEnv * env,jobject obj)183 static void release(JNIEnv* env, jobject obj) {
184 if (sDevice == NULL) {
185 return;
186 }
187
188 int error = activity_recognition_close(sDevice);
189 if (error != 0) {
190 ALOGE("Error closing device: %d", error);
191 return;
192 }
193 }
194
195 /**
196 * Returns true if ActivityRecognition HAL is supported, false otherwise.
197 */
is_supported(JNIEnv * env,jclass clazz)198 static jboolean is_supported(JNIEnv* env, jclass clazz) {
199 if (sModule != NULL && sDevice != NULL ) {
200 return JNI_TRUE;
201 }
202 return JNI_FALSE;
203 }
204
205 /**
206 * Gets an array representing the supported activities.
207 */
get_supported_activities(JNIEnv * env,jobject obj)208 static jobjectArray get_supported_activities(JNIEnv* env, jobject obj) {
209 if (sModule == NULL) {
210 return NULL;
211 }
212
213 char const* const* list = NULL;
214 int list_size = sModule->get_supported_activities_list(sModule, &list);
215 if (list_size <= 0 || list == NULL) {
216 return NULL;
217 }
218
219 jclass string_class = env->FindClass("java/lang/String");
220 if (string_class == NULL) {
221 ALOGE("Unable to find String class for supported activities.");
222 return NULL;
223 }
224
225 jobjectArray string_array = env->NewObjectArray(list_size, string_class, NULL);
226 if (string_array == NULL) {
227 ALOGE("Unable to create string array for supported activities.");
228 return NULL;
229 }
230
231 for (int i = 0; i < list_size; ++i) {
232 const char* string_ptr = const_cast<const char*>(list[i]);
233 jstring string = env->NewStringUTF(string_ptr);
234 env->SetObjectArrayElement(string_array, i, string);
235 }
236
237 return string_array;
238 }
239
240 /**
241 * Enables a given activity event to be actively monitored.
242 */
enable_activity_event(JNIEnv * env,jobject obj,jint activity_handle,jint event_type,jlong report_latency_ns)243 static int enable_activity_event(
244 JNIEnv* env,
245 jobject obj,
246 jint activity_handle,
247 jint event_type,
248 jlong report_latency_ns) {
249 return sDevice->enable_activity_event(
250 sDevice,
251 (uint32_t) activity_handle,
252 (uint32_t) event_type,
253 report_latency_ns);
254 }
255
256 /**
257 * Disables a given activity event from being actively monitored.
258 */
disable_activity_event(JNIEnv * env,jobject obj,jint activity_handle,jint event_type)259 static int disable_activity_event(
260 JNIEnv* env,
261 jobject obj,
262 jint activity_handle,
263 jint event_type) {
264 return sDevice->disable_activity_event(
265 sDevice,
266 (uint32_t) activity_handle,
267 (uint32_t) event_type);
268 }
269
270 /**
271 * Request flush for al batch buffers.
272 */
flush(JNIEnv * env,jobject obj)273 static int flush(JNIEnv* env, jobject obj) {
274 return sDevice->flush(sDevice);
275 }
276
277
278 static JNINativeMethod sMethods[] = {
279 // {"name", "signature", (void*) functionPointer },
280 { "nativeClassInit", "()V", (void*) class_init },
281 { "nativeInitialize", "()V", (void*) initialize },
282 { "nativeRelease", "()V", (void*) release },
283 { "nativeIsSupported", "()Z", (void*) is_supported },
284 { "nativeGetSupportedActivities", "()[Ljava/lang/String;", (void*) get_supported_activities },
285 { "nativeEnableActivityEvent", "(IIJ)I", (void*) enable_activity_event },
286 { "nativeDisableActivityEvent", "(II)I", (void*) disable_activity_event },
287 { "nativeFlush", "()I", (void*) flush },
288 };
289
290 /**
291 * Registration method invoked in JNI load.
292 */
register_android_hardware_location_ActivityRecognitionHardware(JNIEnv * env)293 int register_android_hardware_location_ActivityRecognitionHardware(JNIEnv* env) {
294 return jniRegisterNativeMethods(
295 env,
296 "android/hardware/location/ActivityRecognitionHardware",
297 sMethods,
298 NELEM(sMethods));
299 }
300