Android 事件处理流程
2010-03-19 07:14:00 来源:WEB开发网代码
static jboolean
android_server_KeyInputQueue_readEvent(JNIEnv* env, jobject clazz,
jobject event)
{
gLock.lock();
sp hub = gHub;
if (hub == NULL) {
hub = new EventHub;
gHub = hub;
}
gLock.unlock();
int32_t deviceId;
int32_t type;
int32_t scancode, keycode;
uint32_t flags;
int32_t value;
nsecs_t when;
bool res = hub->getEvent(&deviceId, &type, &scancode, &keycode,
&flags, &value, &when);
env->SetIntField(event, gInputOffsets.mDeviceId, (jint)deviceId);
env->SetIntField(event, gInputOffsets.mType, (jint)type);
env->SetIntField(event, gInputOffsets.mScancode, (jint)scancode);
env->SetIntField(event, gInputOffsets.mKeycode, (jint)keycode);
env->SetIntField(event, gInputOffsets.mFlags, (jint)flags);
env->SetIntField(event, gInputOffsets.mValue, value);
env->SetLongField(event, gInputOffsets.mWhen,
(jlong)(nanoseconds_to_milliseconds(when)));
return res;
}
输入事件分发线程
在frameworks/base/services/java/com/android/server/WindowManagerService.java里创建了一个输入事件分发线程,它负责把事件分发到相应的窗口上去。
Java代码
mQueue.getEvent
dispatchKey/dispatchPointer/dispatchTrackball
mQueue.getEvent
dispatchKey/dispatchPointer/dispatchTrackball
按键,触摸屏流程分析
按键触摸屏流程分析:
WindowManagerService类的构造函数
WindowManagerService()
mQueue = new KeyQ();
因为 WindowManagerService.java (frameworksaseservicesjavacomandroidserver)中有:
private class KeyQ extends KeyInputQueue
KeyQ 是抽象类 KeyInputQueue 的实现,所以 new KeyQ类的时候实际上在 KeyInputQueue 类中创建了
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