react-native文档未更新，照着文档实现还是坑了不少，记录下基本步骤。

1，继承实现com.facebook.react.uimanager.events.Event类MyEventgetViewTag：接受事件view,传view.getId()getEventName:事件名称dispatch：产生方法@Overridepublic void dispatch(RCTEventEmitter rctEventEmitter) {    rctEventEmitter.receiveEvent(getViewTag(), getEventName(), serializeEventData());}2，在ViewManager必须实现方法getExportedCustomDirectEventTypeConstants    public @Nullable    Map getExportedCustomDirectEventTypeConstants() {        return MapBuilder.builder()                .put("onUpdateView", MapBuilder.of("registrationName", "onUpdateView"))                .build();    }3,触发reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(new MyEvent(getId(),SystemClock.nanoTime(),rowId));