harmony 鸿蒙启动指定页面
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';
async function restartAbility() {
let wantInfo: Want = {
bundleName: "com.sample.MyApplication",
abilityName: "EntryAbility",
parameters: {
page: "pages/second"
}
};
featureAbility.startAbility({
want: wantInfo
}).then((data) => {
console.info('restartAbility success.');
});
}
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 Map<string, 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 { GlobalContext } from './GlobalContext';
class EntryAbility {
onNewWant(want: Want) {
GlobalContext.getContext().setObject("newWant", want);
}
}
export default new EntryAbility()
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 '../GlobalContext';
@Entry
@Component
struct Index {
@State message: string = 'Router Page'
onPageShow() {
console.info('Index onPageShow')
let newWant = GlobalContext.getContext().getObject("newWant") as Want
if (newWant.parameters) {
if (newWant.parameters.page) {
router.push({ url: newWant.parameters.page });
GlobalContext.getContext().setObject("newWant", undefined)
}
}
}
build() {
Row() {
Column() {
Text(this.message)
.fontSize(50)
.fontWeight(FontWeight.Bold)
}
.width('100%')
}
.height('100%')
}
}
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.push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PageAbility,startAbility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 { BusinessError } from '@ohos.base';
@Entry
@Component
struct Index {
@State message: string = 'Hello World'
build() {
Row() {
Button("startAbility")
.onClick(() => {
featureAbility.startAbility({
want: {
bundleName: "com.exm.myapplication",
abilityName: "com.exm.myapplication.EntryAbility",
parameters: { page: "pages/page1" }
}
}).then((data) => {
console.info("startAbility finish");
}).catch((err: BusinessError) => {
console.info("startAbility failed errcode:" + err.code)
})
})
...
Button("page2")
.onClick(() => {
featureAbility.startAbility({
want: {
bundleName: "com.exm.myapplication",
abilityName: "com.exm.myapplication.EntryAbility",
parameters: { page: "pages/page2" }
}
}).then((data) => {
console.info("startAbility finish");
}).catch((err: BusinessError) => {
console.info("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 EntryAbility {
onCreate() {
featureAbility.getWant().then((want) => {
if (want.parameters) {
if (want.parameters.page) {
router.push({
url: want.parameters.page as string
})
}
}
})
}
onDestroy() {
// ...
}
}
export default new EntryAbility()
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