harmony 鸿蒙Starting a PageAbility from the Stage Model

2023-02-03
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Starting a PageAbility from the Stage Model

This topic describes how the two application components of the stage model start the PageAbility component of the FA model.

UIAbility Starting a PageAbility

A UIAbility starts a PageAbility in the same way as it starts another UIAbility.

NOTE

In the FA model, abilityName consists of bundleName and AbilityName. For details, see the code snippet below.

import UIAbility from '@ohos.app.ability.UIAbility';
import AbilityConstant from '@ohos.app.ability.AbilityConstant';
import Want from '@ohos.app.ability.Want';
import window from '@ohos.window';
import { BusinessError } from '@ohos.base';

export default class EntryAbility extends UIAbility {
    onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
        console.info("EntryAbility onCreate")
    }
    onDestroy() {
        console.info("EntryAbility onDestroy")
    }
    onWindowStageCreate(windowStage: window.WindowStage) {
        console.info("EntryAbility onWindowStageCreate")
        windowStage.loadContent('pages/Index', (err, data) => {
            // ...
        });
        let want: Want = {
            bundleName: "com.ohos.fa",
            abilityName: "com.ohos.fa.EntryAbility",
        };
        this.context.startAbility(want).then(() => {
            console.info('Start Ability successfully.');
        }).catch((error: BusinessError) => {
            console.error("Ability failed: " + JSON.stringify(error));
        });
    }
    onWindowStageDestroy() {
        console.info("EntryAbility onWindowStageDestroy")
    }
    onForeground() {
        console.info("EntryAbility onForeground")
    }
    onBackground() {
        console.info("EntryAbility onBackground")
    }
}

UIAbility Accessing a PageAbility (startAbilityForResult)

Different from startAbility(), startAbilityForResult() obtains the execution result when the PageAbility is destroyed.

A UIAbility starts a PageAbility through startAbilityForResult() in the same way as it starts another UIAbility through startAbilityForResult().

import UIAbility from '@ohos.app.ability.UIAbility';
import AbilityConstant from '@ohos.app.ability.AbilityConstant';
import Want from '@ohos.app.ability.Want';
import window from '@ohos.window';
import { BusinessError } from '@ohos.base';

export default class EntryAbility extends UIAbility {
    onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
        console.info("EntryAbility onCreate")
    }
    onDestroy() {
        console.info("EntryAbility onDestroy")
    }
    onWindowStageCreate(windowStage: window.WindowStage) {
        console.info("EntryAbility onWindowStageCreate")
        windowStage.loadContent('pages/Index', (err, data) => {
            // ...
        });
        let want: Want = {
            bundleName: "com.ohos.fa",
            abilityName: "EntryAbility",
        };
        this.context.startAbilityForResult(want).then((result) => {
            console.info('Ability verify result: ' + JSON.stringify(result));
        }).catch((error: BusinessError) => {
            console.error("Ability failed: " + JSON.stringify(error));
        });
    }
    onWindowStageDestroy() {
        console.info("EntryAbility onWindowStageDestroy")
    }
    onForeground() {
        console.info("EntryAbility onForeground")
    }
    onBackground() {
        console.info("EntryAbility onBackground")
    }
}

ExtensionAbility Starting a PageAbility

The following uses the ServiceExtensionAbility component as an example to describe how an ExtensionAbility starts a PageAbility. A ServiceExtensionAbility starts a PageAbility in the same way as it starts a UIAbility.

import Extension from '@ohos.app.ability.ServiceExtensionAbility'
import Want from '@ohos.app.ability.Want';
import { BusinessError } from '@ohos.base';

export default class ServiceExtension extends Extension {
    onCreate(want: Want) {
        console.info("ServiceExtension onCreate")
    }
    onDestroy() {
        console.info("ServiceExtension onDestroy")
    }
    onRequest(want: Want, startId: number) {
        console.info("ServiceExtension onRequest")
        let wantFA: Want = {
            bundleName: "com.ohos.fa",
            abilityName: "EntryAbility",
        };
        this.context.startAbility(wantFA).then(() => {
            console.info('Start Ability successfully.');
        }).catch((error: BusinessError) => {
            console.error("Ability failed: " + JSON.stringify(error));
        });
    }
}