ndk/sources/android/native_app_glue/android_native_app_glue.c - platform/development - Git at Google

 /*
  * Copyright (C) 2010 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 <jni.h>

 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/resource.h>

 #include "android_native_app_glue.h"
 #include <android/log.h>

 #define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "threaded_app", __VA_ARGS__))
 #define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "threaded_app", __VA_ARGS__))

 int8_t android_app_read_cmd(struct android_app* android_app) {
     int8_t cmd;
     if (read(android_app->msgread, &cmd, sizeof(cmd)) == sizeof(cmd)) {
         return cmd;
     } else {
         LOGW("No data on command pipe!");
     }
     return -1;
 }

 int32_t android_app_exec_cmd(struct android_app* android_app, int8_t cmd) {
     switch (cmd) {
         case APP_CMD_INPUT_CHANGED:
             LOGI("APP_CMD_INPUT_CHANGED\n");
             pthread_mutex_lock(&android_app->mutex);
             if (android_app->inputQueue != NULL) {
                 AInputQueue_detachLooper(android_app->inputQueue);
             }
             android_app->inputQueue = android_app->pendingInputQueue;
             if (android_app->inputQueue != NULL) {
                 LOGI("Attaching input queue to looper");
                 AInputQueue_attachLooper(android_app->inputQueue,
                         android_app->looper, NULL, (void*)LOOPER_ID_EVENT);
             }
             pthread_cond_broadcast(&android_app->cond);
             pthread_mutex_unlock(&android_app->mutex);
             break;

         case APP_CMD_WINDOW_CHANGED:
             LOGI("APP_CMD_WINDOW_CHANGED\n");
             pthread_mutex_lock(&android_app->mutex);
             android_app->window = android_app->pendingWindow;
             pthread_cond_broadcast(&android_app->cond);
             pthread_mutex_unlock(&android_app->mutex);
             break;

         case APP_CMD_START:
         case APP_CMD_RESUME:
         case APP_CMD_PAUSE:
         case APP_CMD_STOP:
             LOGI("activityState=%d\n", cmd);
             pthread_mutex_lock(&android_app->mutex);
             android_app->activityState = cmd;
             pthread_cond_broadcast(&android_app->cond);
             pthread_mutex_unlock(&android_app->mutex);
             break;

         case APP_CMD_DESTROY:
             LOGI("APP_CMD_DESTROY\n");
             android_app->destroyRequested = 1;
             break;
     }

     return android_app->destroyRequested ? 0 : 1;
 }

 static void android_app_destroy(struct android_app* android_app) {
     LOGI("android_app_destroy!");
     pthread_mutex_lock(&android_app->mutex);
     if (android_app->inputQueue != NULL) {
         AInputQueue_detachLooper(android_app->inputQueue);
     }
     android_app->destroyed = 1;
     pthread_cond_broadcast(&android_app->cond);
     pthread_mutex_unlock(&android_app->mutex);
     // Can't touch android_app object after this.
 }

 static void* android_app_entry(void* param) {
     struct android_app* android_app = (struct android_app*)param;

     ALooper* looper = ALooper_prepare(ALOOPER_PREPARE_ALLOW_NON_CALLBACKS);
     ALooper_addFd(looper, android_app->msgread, POLLIN, NULL, (void*)LOOPER_ID_MAIN);
     android_app->looper = looper;

     pthread_mutex_lock(&android_app->mutex);
     android_app->running = 1;
     pthread_cond_broadcast(&android_app->cond);
     pthread_mutex_unlock(&android_app->mutex);

     android_main(android_app);

     android_app_destroy(android_app);
     return NULL;
 }

 // --------------------------------------------------------------------
 // Native activity interaction (called from main thread)
 // --------------------------------------------------------------------

 static struct android_app* android_app_create(ANativeActivity* activity) {
     struct android_app* android_app = (struct android_app*)malloc(sizeof(struct android_app));
     memset(android_app, 0, sizeof(struct android_app));
     android_app->activity = activity;

     pthread_mutex_init(&android_app->mutex, NULL);
     pthread_cond_init(&android_app->cond, NULL);

     int msgpipe[2];
     if (pipe(msgpipe)) {
         LOGI("could not create pipe: %s", strerror(errno));
     }
     android_app->msgread = msgpipe[0];
     android_app->msgwrite = msgpipe[1];

     pthread_attr_t attr;
     pthread_attr_init(&attr);
     pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
     pthread_create(&android_app->thread, &attr, android_app_entry, android_app);

     // Wait for thread to start.
     pthread_mutex_lock(&android_app->mutex);
     while (!android_app->running) {
         pthread_cond_wait(&android_app->cond, &android_app->mutex);
     }
     pthread_mutex_unlock(&android_app->mutex);

     return android_app;
 }

 static void android_app_write_cmd(struct android_app* android_app, int8_t cmd) {
     if (write(android_app->msgwrite, &cmd, sizeof(cmd)) != sizeof(cmd)) {
         LOGI("Failure writing android_app cmd: %s\n", strerror(errno));
     }
 }

 static void android_app_set_input(struct android_app* android_app, AInputQueue* inputQueue) {
     pthread_mutex_lock(&android_app->mutex);
     android_app->pendingInputQueue = inputQueue;
     android_app_write_cmd(android_app, APP_CMD_INPUT_CHANGED);
     while (android_app->inputQueue != android_app->pendingInputQueue) {
         pthread_cond_wait(&android_app->cond, &android_app->mutex);
     }
     pthread_mutex_unlock(&android_app->mutex);
 }

 static void android_app_set_window(struct android_app* android_app, ANativeWindow* window) {
     pthread_mutex_lock(&android_app->mutex);
     android_app->pendingWindow = window;
     android_app_write_cmd(android_app, APP_CMD_WINDOW_CHANGED);
     while (android_app->window != android_app->pendingWindow) {
         pthread_cond_wait(&android_app->cond, &android_app->mutex);
     }
     pthread_mutex_unlock(&android_app->mutex);
 }

 static void android_app_set_activity_state(struct android_app* android_app, int8_t cmd) {
     pthread_mutex_lock(&android_app->mutex);
     android_app_write_cmd(android_app, cmd);
     while (android_app->activityState != cmd) {
         pthread_cond_wait(&android_app->cond, &android_app->mutex);
     }
     pthread_mutex_unlock(&android_app->mutex);
 }

 static void android_app_free(struct android_app* android_app) {
     pthread_mutex_lock(&android_app->mutex);
     android_app_write_cmd(android_app, APP_CMD_DESTROY);
     while (!android_app->destroyed) {
         pthread_cond_wait(&android_app->cond, &android_app->mutex);
     }
     pthread_mutex_unlock(&android_app->mutex);

     close(android_app->msgread);
     close(android_app->msgwrite);
     pthread_cond_destroy(&android_app->cond);
     pthread_mutex_destroy(&android_app->mutex);
     free(android_app);
 }

 static void onDestroy(ANativeActivity* activity) {
     LOGI("Destroy: %p\n", activity);
     android_app_free((struct android_app*)activity->instance);
 }

 static void onStart(ANativeActivity* activity) {
     LOGI("Start: %p\n", activity);
     android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_START);
 }

 static void onResume(ANativeActivity* activity) {
     LOGI("Resume: %p\n", activity);
     android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_RESUME);
 }

 static void* onSaveInstanceState(ANativeActivity* activity, size_t* outLen) {
     LOGI("SaveInstanceState: %p\n", activity);
     return NULL;
 }

 static void onPause(ANativeActivity* activity) {
     LOGI("Pause: %p\n", activity);
     android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_PAUSE);
 }

 static void onStop(ANativeActivity* activity) {
     LOGI("Stop: %p\n", activity);
     android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_STOP);
 }

 static void onLowMemory(ANativeActivity* activity) {
     LOGI("LowMemory: %p\n", activity);
 }

 static void onWindowFocusChanged(ANativeActivity* activity, int focused) {
     LOGI("WindowFocusChanged: %p -- %d\n", activity, focused);
     android_app_write_cmd((struct android_app*)activity->instance,
             focused ? APP_CMD_GAINED_FOCUS : APP_CMD_LOST_FOCUS);
 }

 static void onNativeWindowCreated(ANativeActivity* activity, ANativeWindow* window) {
     LOGI("NativeWindowCreated: %p -- %p\n", activity, window);
     android_app_set_window((struct android_app*)activity->instance, window);
 }

 static void onNativeWindowDestroyed(ANativeActivity* activity, ANativeWindow* window) {
     LOGI("NativeWindowDestroyed: %p -- %p\n", activity, window);
     android_app_set_window((struct android_app*)activity->instance, NULL);
 }

 static void onInputQueueCreated(ANativeActivity* activity, AInputQueue* queue) {
     LOGI("InputQueueCreated: %p -- %p\n", activity, queue);
     android_app_set_input((struct android_app*)activity->instance, queue);
 }

 static void onInputQueueDestroyed(ANativeActivity* activity, AInputQueue* queue) {
     LOGI("InputQueueDestroyed: %p -- %p\n", activity, queue);
     android_app_set_input((struct android_app*)activity->instance, NULL);
 }

 void ANativeActivity_onCreate(ANativeActivity* activity,
         void* savedState, size_t savedStateSize) {
     LOGI("Creating: %p\n", activity);
     activity->callbacks->onDestroy = onDestroy;
     activity->callbacks->onStart = onStart;
     activity->callbacks->onResume = onResume;
     activity->callbacks->onSaveInstanceState = onSaveInstanceState;
     activity->callbacks->onPause = onPause;
     activity->callbacks->onStop = onStop;
     activity->callbacks->onLowMemory = onLowMemory;
     activity->callbacks->onWindowFocusChanged = onWindowFocusChanged;
     activity->callbacks->onNativeWindowCreated = onNativeWindowCreated;
     activity->callbacks->onNativeWindowDestroyed = onNativeWindowDestroyed;
     activity->callbacks->onInputQueueCreated = onInputQueueCreated;
     activity->callbacks->onInputQueueDestroyed = onInputQueueDestroyed;

     activity->instance = android_app_create(activity);
 }
	/*
	* Copyright (C) 2010 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 <jni.h>

	#include <errno.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/resource.h>

	#include "android_native_app_glue.h"
	#include <android/log.h>

	#define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "threaded_app", __VA_ARGS__))
	#define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "threaded_app", __VA_ARGS__))

	int8_t android_app_read_cmd(struct android_app* android_app) {
	int8_t cmd;
	if (read(android_app->msgread, &cmd, sizeof(cmd)) == sizeof(cmd)) {
	return cmd;
	} else {
	LOGW("No data on command pipe!");
	}
	return -1;
	}

	int32_t android_app_exec_cmd(struct android_app* android_app, int8_t cmd) {
	switch (cmd) {
	case APP_CMD_INPUT_CHANGED:
	LOGI("APP_CMD_INPUT_CHANGED\n");
	pthread_mutex_lock(&android_app->mutex);
	if (android_app->inputQueue != NULL) {
	AInputQueue_detachLooper(android_app->inputQueue);
	}
	android_app->inputQueue = android_app->pendingInputQueue;
	if (android_app->inputQueue != NULL) {
	LOGI("Attaching input queue to looper");
	AInputQueue_attachLooper(android_app->inputQueue,
	android_app->looper, NULL, (void*)LOOPER_ID_EVENT);
	}
	pthread_cond_broadcast(&android_app->cond);
	pthread_mutex_unlock(&android_app->mutex);
	break;

	case APP_CMD_WINDOW_CHANGED:
	LOGI("APP_CMD_WINDOW_CHANGED\n");
	pthread_mutex_lock(&android_app->mutex);
	android_app->window = android_app->pendingWindow;
	pthread_cond_broadcast(&android_app->cond);
	pthread_mutex_unlock(&android_app->mutex);
	break;

	case APP_CMD_START:
	case APP_CMD_RESUME:
	case APP_CMD_PAUSE:
	case APP_CMD_STOP:
	LOGI("activityState=%d\n", cmd);
	pthread_mutex_lock(&android_app->mutex);
	android_app->activityState = cmd;
	pthread_cond_broadcast(&android_app->cond);
	pthread_mutex_unlock(&android_app->mutex);
	break;

	case APP_CMD_DESTROY:
	LOGI("APP_CMD_DESTROY\n");
	android_app->destroyRequested = 1;
	break;
	}

	return android_app->destroyRequested ? 0 : 1;
	}

	static void android_app_destroy(struct android_app* android_app) {
	LOGI("android_app_destroy!");
	pthread_mutex_lock(&android_app->mutex);
	if (android_app->inputQueue != NULL) {
	AInputQueue_detachLooper(android_app->inputQueue);
	}
	android_app->destroyed = 1;
	pthread_cond_broadcast(&android_app->cond);
	pthread_mutex_unlock(&android_app->mutex);
	// Can't touch android_app object after this.
	}

	static void* android_app_entry(void* param) {
	struct android_app* android_app = (struct android_app*)param;

	ALooper* looper = ALooper_prepare(ALOOPER_PREPARE_ALLOW_NON_CALLBACKS);
	ALooper_addFd(looper, android_app->msgread, POLLIN, NULL, (void*)LOOPER_ID_MAIN);
	android_app->looper = looper;

	pthread_mutex_lock(&android_app->mutex);
	android_app->running = 1;
	pthread_cond_broadcast(&android_app->cond);
	pthread_mutex_unlock(&android_app->mutex);

	android_main(android_app);

	android_app_destroy(android_app);
	return NULL;
	}

	// --------------------------------------------------------------------
	// Native activity interaction (called from main thread)
	// --------------------------------------------------------------------

	static struct android_app* android_app_create(ANativeActivity* activity) {
	struct android_app* android_app = (struct android_app*)malloc(sizeof(struct android_app));
	memset(android_app, 0, sizeof(struct android_app));
	android_app->activity = activity;

	pthread_mutex_init(&android_app->mutex, NULL);
	pthread_cond_init(&android_app->cond, NULL);

	int msgpipe[2];
	if (pipe(msgpipe)) {
	LOGI("could not create pipe: %s", strerror(errno));
	}
	android_app->msgread = msgpipe[0];
	android_app->msgwrite = msgpipe[1];

	pthread_attr_t attr;
	pthread_attr_init(&attr);
	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
	pthread_create(&android_app->thread, &attr, android_app_entry, android_app);

	// Wait for thread to start.
	pthread_mutex_lock(&android_app->mutex);
	while (!android_app->running) {
	pthread_cond_wait(&android_app->cond, &android_app->mutex);
	}
	pthread_mutex_unlock(&android_app->mutex);

	return android_app;
	}

	static void android_app_write_cmd(struct android_app* android_app, int8_t cmd) {
	if (write(android_app->msgwrite, &cmd, sizeof(cmd)) != sizeof(cmd)) {
	LOGI("Failure writing android_app cmd: %s\n", strerror(errno));
	}
	}

	static void android_app_set_input(struct android_app* android_app, AInputQueue* inputQueue) {
	pthread_mutex_lock(&android_app->mutex);
	android_app->pendingInputQueue = inputQueue;
	android_app_write_cmd(android_app, APP_CMD_INPUT_CHANGED);
	while (android_app->inputQueue != android_app->pendingInputQueue) {
	pthread_cond_wait(&android_app->cond, &android_app->mutex);
	}
	pthread_mutex_unlock(&android_app->mutex);
	}

	static void android_app_set_window(struct android_app* android_app, ANativeWindow* window) {
	pthread_mutex_lock(&android_app->mutex);
	android_app->pendingWindow = window;
	android_app_write_cmd(android_app, APP_CMD_WINDOW_CHANGED);
	while (android_app->window != android_app->pendingWindow) {
	pthread_cond_wait(&android_app->cond, &android_app->mutex);
	}
	pthread_mutex_unlock(&android_app->mutex);
	}

	static void android_app_set_activity_state(struct android_app* android_app, int8_t cmd) {
	pthread_mutex_lock(&android_app->mutex);
	android_app_write_cmd(android_app, cmd);
	while (android_app->activityState != cmd) {
	pthread_cond_wait(&android_app->cond, &android_app->mutex);
	}
	pthread_mutex_unlock(&android_app->mutex);
	}

	static void android_app_free(struct android_app* android_app) {
	pthread_mutex_lock(&android_app->mutex);
	android_app_write_cmd(android_app, APP_CMD_DESTROY);
	while (!android_app->destroyed) {
	pthread_cond_wait(&android_app->cond, &android_app->mutex);
	}
	pthread_mutex_unlock(&android_app->mutex);

	close(android_app->msgread);
	close(android_app->msgwrite);
	pthread_cond_destroy(&android_app->cond);
	pthread_mutex_destroy(&android_app->mutex);
	free(android_app);
	}

	static void onDestroy(ANativeActivity* activity) {
	LOGI("Destroy: %p\n", activity);
	android_app_free((struct android_app*)activity->instance);
	}

	static void onStart(ANativeActivity* activity) {
	LOGI("Start: %p\n", activity);
	android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_START);
	}

	static void onResume(ANativeActivity* activity) {
	LOGI("Resume: %p\n", activity);
	android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_RESUME);
	}

	static void* onSaveInstanceState(ANativeActivity* activity, size_t* outLen) {
	LOGI("SaveInstanceState: %p\n", activity);
	return NULL;
	}

	static void onPause(ANativeActivity* activity) {
	LOGI("Pause: %p\n", activity);
	android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_PAUSE);
	}

	static void onStop(ANativeActivity* activity) {
	LOGI("Stop: %p\n", activity);
	android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_STOP);
	}

	static void onLowMemory(ANativeActivity* activity) {
	LOGI("LowMemory: %p\n", activity);
	}

	static void onWindowFocusChanged(ANativeActivity* activity, int focused) {
	LOGI("WindowFocusChanged: %p -- %d\n", activity, focused);
	android_app_write_cmd((struct android_app*)activity->instance,
	focused ? APP_CMD_GAINED_FOCUS : APP_CMD_LOST_FOCUS);
	}

	static void onNativeWindowCreated(ANativeActivity* activity, ANativeWindow* window) {
	LOGI("NativeWindowCreated: %p -- %p\n", activity, window);
	android_app_set_window((struct android_app*)activity->instance, window);
	}

	static void onNativeWindowDestroyed(ANativeActivity* activity, ANativeWindow* window) {
	LOGI("NativeWindowDestroyed: %p -- %p\n", activity, window);
	android_app_set_window((struct android_app*)activity->instance, NULL);
	}

	static void onInputQueueCreated(ANativeActivity* activity, AInputQueue* queue) {
	LOGI("InputQueueCreated: %p -- %p\n", activity, queue);
	android_app_set_input((struct android_app*)activity->instance, queue);
	}

	static void onInputQueueDestroyed(ANativeActivity* activity, AInputQueue* queue) {
	LOGI("InputQueueDestroyed: %p -- %p\n", activity, queue);
	android_app_set_input((struct android_app*)activity->instance, NULL);
	}

	void ANativeActivity_onCreate(ANativeActivity* activity,
	void* savedState, size_t savedStateSize) {
	LOGI("Creating: %p\n", activity);
	activity->callbacks->onDestroy = onDestroy;
	activity->callbacks->onStart = onStart;
	activity->callbacks->onResume = onResume;
	activity->callbacks->onSaveInstanceState = onSaveInstanceState;
	activity->callbacks->onPause = onPause;
	activity->callbacks->onStop = onStop;
	activity->callbacks->onLowMemory = onLowMemory;
	activity->callbacks->onWindowFocusChanged = onWindowFocusChanged;
	activity->callbacks->onNativeWindowCreated = onNativeWindowCreated;
	activity->callbacks->onNativeWindowDestroyed = onNativeWindowDestroyed;
	activity->callbacks->onInputQueueCreated = onInputQueueCreated;
	activity->callbacks->onInputQueueDestroyed = onInputQueueDestroyed;

	activity->instance = android_app_create(activity);
	}