幾句話概括:
1. onEvent()
使用onEvent來接收事件,那麼接收事件和post事件在同一個線程中執行
2. onEventMainThread()
使用onEventMainThread來接收事件,那麼不論post事件在哪個線程運行,接收事件永遠在UI線程執行
3. onEventBackgroundThread()
使用onEventBackgroundThread來接收事件,如果post事件在子線程運行,那麼接收事件直接在同一個線程
運行,如果post事件在UI線程,那麼會啓動一個子線程接收事件
4. onEventAsync()
使用onEventAsync接收事件,無論post事件在哪個線程 (UI或者子線程) 執行,接收事件都會在一個新的子線程執行
具體可參考源碼:
private void postToSubscription(Subscription subscription, Object event, boolean isMainThread) {
//線程切換之前進行攔截
if (!needInvokeSubscriber(subscription, event)) {
return;
}
switch (subscription.subscriberMethod.threadMode) {
case POSTING:
invokeSubscriber(subscription, event);
break;
case MAIN:
if (isMainThread) {
invokeSubscriber(subscription, event);
} else {
mainThreadPoster.enqueue(subscription, event);
}
break;
case BACKGROUND:
if (isMainThread) {
backgroundPoster.enqueue(subscription, event);
} else {
invokeSubscriber(subscription, event);
}
break;
case ASYNC:
asyncPoster.enqueue(subscription, event);
break;
default:
throw new IllegalStateException("Unknown thread mode: " + subscription.subscriberMethod.threadMode);
}
}