HarmonyOS 生命周期的区别

onPageShow：页面每次显示时触发一次，包括路由过程、应用进入前台等场景，仅@Entry装饰的自定义组件生效。onPageHide：页面每次隐藏时触发一次，包括路由过程、应用进入后台等场景，仅@Entry装饰的自定义组件生效。onForeground：Ability生命周期回调，当应用从后台转到前台时触发。onBackground： Ability生命周期回调，当应用从前台转到后台时触发。相关文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-custom-component-lifecycle-V5#onpageshow

相关文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-app-ability-uiability-V5#uiabilityonforeground

如何区分应用前后台：关于监听提供window.on("windowEvent")接口，指导如下：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-window-V5#onwindowevent10

Demo:

onWindowStageCreate(windowStage: window.WindowStage) {
// Main window is created, set main page for this ability
hilog.info(0x0000, ‘testTag’, ‘%{public}s’, ‘Ability onWindowStageCreate’);
windowStage.loadContent(‘pages/AppGeoLocation’, (err, data) => {
if (err.code) {
hilog.error(0x0000, ‘testTag’, ‘Failed to load the content. Cause: %{public}s’, JSON.stringify(err) ?? ‘’);
return;
}
windowStage.getMainWindowSync().on(“windowEvent”, (data) => {
if (data == window.WindowEventType.WINDOW_SHOWN) {
console.log(“App is in Foreground”)
}
else if(data == window.WindowEventType.WINDOW_HIDDEN){
console.log(“App is in Background”)
}
})
hilog.info(0x0000, ‘testTag’, ‘Succeeded in loading the content. Data: %{public}s’, JSON.stringify(data) ?? ‘’);
});
}