上海网站建设公司兴田德润优惠吗,网站设计规划高中信息技术,答题app制作教程,网站的形成启动指定页面
当PageAbility的启动模式设置为单例时#xff08;具体设置方法和典型场景示例见[PageAbility的启动模式]#xff0c;缺省情况下是单实例模式#xff09;#xff0c;若PageAbility已被拉起#xff0c;再次启动PageAbility会触发onNewWant回调#xff08;即非…启动指定页面
当PageAbility的启动模式设置为单例时具体设置方法和典型场景示例见[PageAbility的启动模式]缺省情况下是单实例模式若PageAbility已被拉起再次启动PageAbility会触发onNewWant回调即非首次拉起。应用开发者可以通过want传递启动参数例如开发者希望指定页面启动PageAbility可以通过want中的parameters参数传递pages信息具体示例代码如下
调用方PageAbility的app.ets中或者page中使用startAbility再次拉起PageAbility通过want中的uri参数传递页面信息
import featureAbility from ohos.ability.featureAbility;
import Want from ohos.app.ability.Want;
import hilog from ohos.hilog;const TAG: string PagePageAbilityFirst;
const domain: number 0xFF00;(async (): Promisevoid {let wantInfo: Want {bundleName: com.samples.famodelabilitydevelop,abilityName: com.samples.famodelabilitydevelop.PageAbilitySingleton,parameters: { page: pages/second }};featureAbility.startAbility({ want: wantInfo }).then((data) {hilog.debug(domain, TAG, restartAbility success : ${data});});
})()在目标端PageAbility的onNewWant回调中获取包含页面信息的want参数
// GlobalContext.ts 构造单例对象
export class GlobalContext {private constructor() {}private static instance: GlobalContext;private _objects new Mapstring, Object();public static getContext(): GlobalContext {if (!GlobalContext.instance) {GlobalContext.instance new GlobalContext();}return GlobalContext.instance;}getObject(value: string): Object | undefined {return this._objects.get(value);}setObject(key: string, objectClass: Object): void {this._objects.set(key, objectClass);}
}import Want from ohos.app.ability.Want;
import featureAbility from ohos.ability.featureAbility;
import { GlobalContext } from ../utils/GlobalContext;class PageAbilitySingleton {onNewWant(want: Want) {featureAbility.getWant().then((want) {GlobalContext.getContext().setObject(newWant, want);})}
}export default new PageAbilitySingleton();在目标端页面的自定义组件中获取包含页面信息的want参数并根据uri做路由处理
import Want from ohos.app.ability.Want;
import router from ohos.router;
import { GlobalContext } from ../../utils/GlobalContext;Entry
Component
struct First {onPageShow() {let newWant GlobalContext.getContext().getObject(newWant) as Want;if (newWant) {if (newWant.parameters) {if (newWant.parameters.page) {router.pushUrl({ url: newWant.parameters.page as string});GlobalContext.getContext().setObject(newWant, undefined)}}}}build() {Column() {Row() {Text($r(app.string.singleton_first_title)).fontSize(24).fontWeight(FontWeight.Bold).textAlign(TextAlign.Start).margin({ top: 12, bottom: 11, right: 24, left: 24 })}.width(100%).height(56).justifyContent(FlexAlign.Start)Image($r(app.media.pic_empty)).width(120).height(120).margin({ top: 224 })Text($r(app.string.no_content)).fontSize(14).margin({ top: 8, bottom: 317, right: 152, left: 152 }).fontColor($r(app.color.text_color)).opacity(0.4)}.width(100%).height(100%).backgroundColor($r(app.color.backGrounding))}
}当PageAbility的启动模式设置为多实例模式或为首次启动单例模式的PageAbility时具体设置方法和典型场景示例见[PageAbility的启动模式]在调用方PageAbility中通过want中的parameters参数传递要启动的指定页面的pages信息调用startAbility()方法启动PageAbility。被调用方可以在onCreate中使用featureAbility的getWant方法获取want再通过调用router.pushUrl实现启动指定页面。
调用方的页面中实现按钮点击触发startAbility方法启动目标端PageAbilitystartAbility方法的入参want中携带指定页面信息示例代码如下
import featureAbility from ohos.ability.featureAbility;
import Want from ohos.app.ability.Want;
import { BusinessError } from ohos.base;
import fs from ohos.file.fs;
import promptAction from ohos.promptAction;
import worker from ohos.worker;
import hilog from ohos.hilog;const TAG: string PagePageAbilityFirst;
const domain: number 0xFF00;Entry
Component
struct PagePageAbilityFirst {build() {Column() {//...List({ initialIndex: 0 }) {//...ListItem() {Flex({ justifyContent: FlexAlign.SpaceBetween, alignContent: FlexAlign.Center }) {//...}.onClick(() {let want: Want {bundleName: com.samples.famodelabilitydevelop,abilityName: com.samples.famodelabilitydevelop.PageAbilityStandard,parameters: { page: pages/first }};featureAbility.startAbility({ want: want }).then((data) {hilog.info(domain, TAG, startAbility finish:${data});}).catch((err: BusinessError) {hilog.info(domain, TAG, startAbility failed errcode:${err.code});})})}//...ListItem() {Flex({ justifyContent: FlexAlign.SpaceBetween, alignContent: FlexAlign.Center }) {//...}.onClick(() {let want: Want {bundleName: com.samples.famodelabilitydevelop,abilityName: com.samples.famodelabilitydevelop.PageAbilityStandard,parameters: { page: pages/second }};featureAbility.startAbility({ want: want }).then((data) {hilog.info(domain, TAG, startAbility finish:${data});}).catch((err: BusinessError) {hilog.info(domain, TAG, startAbility failed errcode:${err.code});})})}//...}//...}//...}
}目标端PageAbility的onCreate生命周期回调中通过featureAbility的getWant方法获取want并对参数进行解析实现指定页面拉起
import featureAbility from ohos.ability.featureAbility;
import router from ohos.router;class PageAbilityStandard {onCreate() {featureAbility.getWant().then((want) {if (want.parameters) {if (want.parameters.page) {router.pushUrl({ url: want.parameters.page as string });}}})}
}export default new PageAbilityStandard();
