xbmc接受遥控键值并生成 XBMC_Event的过程

/*xbmc/android/Android_main.cpp*/extern void android_main(struct android_app* state){  {    app_dummy();    state->inputPollSource.process = process_input;    CEventLoop eventLoop(state);    CXBMCApp xbmcApp(state->activity);    if (xbmcApp.isValid())    {      IInputHandler inputHandler;      eventLoop.run(xbmcApp, inputHandler);    }  ...  }  exit(0);}static void process_input(struct android_app* app, struct android_poll_source* source) {    AInputEvent* event = NULL;    int processed = 0;    while (AInputQueue_getEvent(app->inputQueue, &event) >= 0) {        if (AInputQueue_preDispatchEvent(app->inputQueue, event)) {            continue;        }        int32_t handled = 0;        if (app->onInputEvent != NULL) handled = app->onInputEvent(app, event);        AInputQueue_finishEvent(app->inputQueue, event, handled);        processed = 1;    }    ...}

 //xbmc/android/activity/EventLoop.cppint32_t CEventLoop::inputCallback(android_app* application, AInputEvent* event){  if (application == NULL || application->userData == NULL || event == NULL)    return 0;  CEventLoop& eventLoop = *((CEventLoop*)application->userData);  return eventLoop.processInput(event);}int32_t CEventLoop::processInput(AInputEvent* event){  int32_t type   = AInputEvent_getType(event);  int32_t source = AInputEvent_getSource(event);  switch(type)  {    case AINPUT_EVENT_TYPE_KEY:      if (source & AINPUT_SOURCE_GAMEPAD || source & AINPUT_SOURCE_JOYSTICK)      {        if (m_inputHandler->onJoyStickKeyEvent(event))          return true;      }      rtn = m_inputHandler->onKeyboardEvent(event);      break;    case...  }  return rtn;}

//xbmc/android/activity/AndroidKey.cpptypedef struct {  int32_t nativeKey;  int16_t xbmcKey;} KeyMap;static KeyMap keyMap[] = {  { AKEYCODE_VOLUME_UP       , XBMCK_PLUS },};bool CAndroidKey::onKeyboardEvent(AInputEvent *event){  int32_t flags   = AKeyEvent_getFlags(event);  int32_t state   = AKeyEvent_getMetaState(event);  int32_t action  = AKeyEvent_getAction(event);  int32_t repeat  = AKeyEvent_getRepeatCount(event);  int32_t keycode = AKeyEvent_getKeyCode(event);  int32_t deviceId = AInputEvent_getDeviceId(event);  CJNIKeyCharacterMap map = CJNIKeyCharacterMap::load(deviceId);  uint16_t unicode = map.get(keycode, state);  // Check if we got some special key  uint16_t sym = XBMCK_UNKNOWN;  for (unsigned int index = 0; index < sizeof(keyMap) / sizeof(KeyMap); index++)  {    if (keycode == keyMap[index].nativeKey)    {      sym = keyMap[index].xbmcKey;      break;    }  }  switch (action)  {    case AKEY_EVENT_ACTION_DOWN:  CXBMCApp::android_printf("CAndroidKey: key down (code: %d; repeat: %d; flags: 0x%0X; alt: %s; shift: %s; sym: %s)",        keycode, repeat, flags,        (state & AMETA_ALT_ON) ? "yes" : "no",        (state & AMETA_SHIFT_ON) ? "yes" : "no",        (state & AMETA_SYM_ON) ? "yes" : "no");      XBMC_Key((uint8_t)keycode, sym, modifiers, unicode, false);      return true;  ...   }}

我们得弄明白keyMap[index].nativeKey的值在哪儿定义的这句话

/*tools/depends/target/android-sources-ics/android-source/frameworks/base/native/include/android/keycodes.h*/enum {    AKEYCODE_VOLUME_UP       = 24,    ...}

接下来就是把android键盘打包为xbmc内部的XBMC_Event，扔到消息队列中

void CAndroidKey::XBMC_Key(uint8_t code, uint16_t key, uint16_t modifiers, uint16_t unicode, bool up){  XBMC_Event newEvent;  memset(&newEvent, 0, sizeof(newEvent));  unsigned char type = up ? XBMC_KEYUP : XBMC_KEYDOWN;  newEvent.type = type;  newEvent.key.type = type;  newEvent.key.keysym.scancode = code;  newEvent.key.keysym.sym = (XBMCKey)key;  newEvent.key.keysym.unicode = unicode;  newEvent.key.keysym.mod = (XBMCMod)modifiers;  //CXBMCApp::android_printf("XBMC_Key(%u, %u, 0x%04X, %d)", code, key, modifiers, up);  CWinEvents::MessagePush(&newEvent);}