1，首先添加一个全局的生命周期监听类

class AppLifecycleObserver with WidgetsBindingObserver {bool IsCold = false;bool isAgree = false;void getIsCold() async {isAgree = await SPManager().getBool(SPKeys.isAgreePrivacy, defaultValue: true);IsCold = await SPManager().getBool("isCold", defaultValue: false);}Future<bool> getIsVipPay() async {return await SPManager().getBool('isVipPay', defaultValue: false);}@overridevoid didChangeAppLifecycleState(AppLifecycleState state) {super.didChangeAppLifecycleState(state);getIsCold();if(!isAgree) {if (state == AppLifecycleState.resumed) {if (!IsCold) {//热启动开屏广告IdcardAndroid().showSplashAd(AdsConfig.splashId);SPManager().setBool("isCold", true);} else {SPManager().setBool("isCold", AdsConfig.isPayBack? true: false);}SPManager().getBool(SPKeys.isShowPayPage, defaultValue: false).then((value) => {if (value){//满足条件开始计时GlobalAdsTimer.showScreenAds()}});}}if (state == AppLifecycleState.paused){//退入后台时停止广告计时GlobalAdsTimer.stop();} else if (state == AppLifecycleState.detached) {}}}

在main（）入口绑定 就可以监测到了 全局的生命周期

`WidgetsBinding.instance.addObserver(AppLifecycleObserver());

2，定义一个全局的计时器 GlobalAdsTimer()

class GlobalAdsTimer {static Timer? timerHalfScreen;//展示广告static void start() {timerHalfScreen?.cancel();timerHalfScreen = null;timerHalfScreen = Timer.periodic(const Duration(minutes: 3), (timer) {showTodayHalfScreenVideo();setRealSystemUIOverlayStyle = true;addTodayHalfScreenNumVideo();timerHalfScreen?.cancel();timerHalfScreen = null;GroMoreManager().showInterstitialAd((b){//如果当前有前一个插屏广告未关闭就不继续请求if (b){showScreenAds();}});});}//展示条件static void showScreenAds() {print('GlobalAdsTimer_showScreenAds');GroMoreManager().isShowHomeInterstitialAd().then((value) => {if (value) {getShowTodayHalfScreenVideo().then((value) => {if (value) {clearTodayHalfScreenNumVideo(0),},getShowTodayHalfScreenNumVideo().then((int num) => {if (num < 5) {start(),} else {timerHalfScreen?.cancel(),timerHalfScreen = null,}})})}});}// 停止广告 应用退入后台/进入通用付费页/引导付费页 停止计时static void stop() {print('GlobalAdsTimer_stop');timerHalfScreen?.cancel();}

3，当进入特殊页面禁止弹出插屏广告，例如付费页禁止弹出影响用户付费率时
VipPage

 @overridevoid initState() {super.initState();//停止计时GlobalAdsTimer.stop();  }

页面销毁时开始

 @overridevoid dispose() {super.dispose();GlobalAdsTimer.showScreenAds();}