无Java开发Android应用(NativeActivity) (2)

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static void engine_handle_cmd(struct android_app* app, int32_t cmd) {

struct engine* engine = (struct engine*)app->userData;

switch (cmd) {

case APP_CMD_SAVE_STATE:

// The system has asked us to save our current state. Do so.

engine->app->savedState = malloc(sizeof(struct saved_state));

*((struct saved_state*)engine->app->savedState) = engine->state;

engine->app->savedStateSize = sizeof(struct saved_state);

break;

case APP_CMD_INIT_WINDOW:

// The window is being shown, get it ready.

if (engine->app->window != NULL) {

engine_init_display(engine);

engine_draw_frame(engine);

}

break;

case APP_CMD_TERM_WINDOW:

// The window is being hidden or closed, clean it up.

engine_term_display(engine);

break;

case APP_CMD_GAINED_FOCUS:

// When our app gains focus, we start monitoring the accelerometer.

if (engine->accelerometerSensor != NULL) {

ASensorEventQueue_enableSensor(engine->sensorEventQueue,

engine->accelerometerSensor);

// We'd like to get 60 events per second (in us).

ASensorEventQueue_setEventRate(engine->sensorEventQueue,

engine->accelerometerSensor, (1000L/60)*1000);

}

break;

case APP_CMD_LOST_FOCUS:

// When our app loses focus, we stop monitoring the accelerometer.

// This is to avoid consuming battery while not being used.

if (engine->accelerometerSensor != NULL) {

ASensorEventQueue_disableSensor(engine->sensorEventQueue,

engine->accelerometerSensor);

}

// Also stop animating.

engine->animating = 0;

engine_draw_frame(engine);

break;

}

/**

* This is the main entry point of a native application that is using

* android_native_app_glue. It runs in its own thread, with its own

* event loop for receiving input events and doing other things.

void android_main(struct android_app* state) {

struct engine engine;

// Make sure glue isn't stripped.

app_dummy();

memset(&engine, 0, sizeof(engine));

state->userData = &engine;

state->onAppCmd = engine_handle_cmd;

state->onInputEvent = engine_handle_input;

engine.app = state;

// Prepare to monitor accelerometer

engine.sensorManager = ASensorManager_getInstance();

engine.accelerometerSensor = ASensorManager_getDefaultSensor(engine.sensorManager,

ASENSOR_TYPE_ACCELEROMETER);

engine.sensorEventQueue = ASensorManager_createEventQueue(engine.sensorManager,

state->looper, LOOPER_ID_USER, NULL, NULL);

if (state->savedState != NULL) {

// We are starting with a previous saved state; restore from it.

engine.state = *(struct saved_state*)state->savedState;

}

// loop waiting for stuff to do.

while (1) {

// Read all pending events.

int ident;

int events;

struct android_poll_source* source;

// If not animating, we will block forever waiting for events.

// If animating, we loop until all events are read, then continue

// to draw the next frame of animation.

while ((ident=ALooper_pollAll(engine.animating ? 0 : -1, NULL, &events,

(void**)&source)) >= 0) {

// Process this event.

if (source != NULL) {

source->process(state, source);

}

// If a sensor has data, process it now.

if (ident == LOOPER_ID_USER) {

if (engine.accelerometerSensor != NULL) {

ASensorEvent event;

while (ASensorEventQueue_getEvents(engine.sensorEventQueue,

&event, 1) > 0) {

LOGI("accelerometer: x=%f y=%f z=%f",

event.acceleration.x, event.acceleration.y,

event.acceleration.z);

}

// Check if we are exiting.

if (state->destroyRequested != 0) {

engine_term_display(&engine);

return;

}

if (engine.animating) {

// Done with events; draw next animation frame.

engine.state.angle += .01f;

if (engine.state.angle > 1) {

engine.state.angle = 0;

}

// Drawing is throttled to the screen update rate, so there

// is no need to do timing here.

engine_draw_frame(&engine);

}

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无Java开发Android应用(NativeActivity) (2)