android键盘映射
2010-07-15 21:14:00 来源:WEB开发网public void run() {
// 在循环中调用:
readEvent(ev);
...
send = preprocessEvent(di, ev);
//实际调用的是 KeyQ 类的 preprocessEvent 函数
...
int keycode = rotateKeyCodeLocked(ev.keycode);
int[] map = mKeyRotationMap;
for (int i=0; i
if (map == keyCode)
return map[i+1];
} //
addLocked(di, curTime, ev.flags,RawInputEvent.CLASS_KEYBOARD,
newKeyEvent(di, di.mDownTime, curTime, down,keycode, 0, scancode,...));
QueuedEvent ev = obtainLocked(device, when, flags, classType, event);
}
};
readEvent() 实际上调用的是 com_android_server_KeyInputQueue.cpp (frameworksaseservicesjni)中的
static jboolean android_server_KeyInputQueue_readEvent(JNIEnv* env, jobject clazz,jobject event) 来读取事件,
bool res = hub->getEvent(&deviceId, &type, &scancode, &keycode,&flags, &value, &when)调用的是EventHub.cpp (frameworksaselibsui)中的:
bool EventHub::getEvent (int32_t* outDeviceId, int32_t* outType,
int32_t* outScancode, int32_t* outKeycode, uint32_t *outFlags,
int32_t* outValue, nsecs_t* outWhen)
在函数中调用了读设备操作:res = read(mFDs.fd, &iev, sizeof(iev));
在构造函数 WindowManagerService()调用 new KeyQ() 以后接着调用了:
mInputThread = new InputDispatcherThread();
...
mInputThread.start();
来启动一个线程 InputDispatcherThread
run()
process();
QueuedEvent ev = mQueue.getEvent(...)
因为WindowManagerService类中: final KeyQ mQueue;
所以实际上 InputDispatcherThread 线程实际上从 KeyQ 的事件队列中读取按键事件,在process() 方法中进行处理事件。
switch (ev.classType)
case RawInputEvent.CLASS_KEYBOARD:
...
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