图解EventBus

目录

• 注册

• 发送事件

• 反注册

• 主线程模式

• postSticky

• 设计模式

  1. 单例

注册

发送事件

反注册

主线程模式

使用方法

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void methodA1(MessageEvent event) {

    }

postSticky

    public void postSticky(Object event) {
        synchronized (stickyEvents) {
            stickyEvents.put(event.getClass(), event);
        }
        // Should be posted after it is putted, in case the subscriber wants to remove immediately
        post(event);
    }

设计模式

单例

public class EventBus {

    static volatile EventBus defaultInstance;
    
    /** Convenience singleton for apps using a process-wide EventBus instance. */
    public static EventBus getDefault() {
        EventBus instance = defaultInstance;
        if (instance == null) {
            synchronized (EventBus.class) {
                instance = EventBus.defaultInstance;
                if (instance == null) {
                    instance = EventBus.defaultInstance = new EventBus();
                }
            }
        }
        return instance;
    }
}