harmony 鸿蒙@ohos.app.ability.ApplicationStateChangeCallback (ApplicationStateChangeCallback)
@ohos.app.ability.ApplicationStateChangeCallback (ApplicationStateChangeCallback)
ApplicationStateChangeCallback模块提供应用上下文ApplicationContext对当前应用前后台变化监听回调的能力,包括onApplicationForeground、onApplicationBackground方法。
说明:
本模块首批接口从API version 10 开始支持。后续版本的新增接口,采用上角标单独标记接口的起始版本。
本模块接口仅可在Stage模型下使用。
导入模块
import ApplicationStateChangeCallback from '@ohos.app.ability.ApplicationStateChangeCallback';
ApplicationStateChangeCallback.onApplicationForeground
onApplicationForeground(): void;
注册当前应用前后台变化的监听后,在当前应用从后台切换到前台时触发回调。
系统能力:SystemCapability.Ability.AbilityRuntime.AbilityCore
示例:
import UIAbility from '@ohos.app.ability.UIAbility';
import ApplicationStateChangeCallback from '@ohos.app.ability.ApplicationStateChangeCallback';
let applicationStateChangeCallback: ApplicationStateChangeCallback = {
onApplicationForeground() {
console.info('applicationStateChangeCallback onApplicationForeground');
},
onApplicationBackground() {
console.info('applicationStateChangeCallback onApplicationBackground');
}
}
export default class MyAbility extends UIAbility {
onCreate() {
console.log('MyAbility onCreate');
// 1.获取applicationContext
let applicationContext = this.context.getApplicationContext();
// 2.通过applicationContext注册应用前后台状态监听
if (applicationContext != undefined) {
applicationContext.on('applicationStateChange', applicationStateChangeCallback);
}
}
onDestroy() {
let applicationContext = this.context.getApplicationContext();
// 1.通过applicationContext解除注册应用前后台状态监听
if (applicationContext != undefined) {
applicationContext.off('applicationStateChange', applicationStateChangeCallback);
}
}
}
ApplicationStateChangeCallback.onApplicationBackground
onApplicationBackground(): void;
注册当前应用前后台变化的监听后,在当前应用从前台切换到后台时触发回调。
系统能力:SystemCapability.Ability.AbilityRuntime.AbilityCore
示例:
import UIAbility from '@ohos.app.ability.UIAbility';
import ApplicationStateChangeCallback from '@ohos.app.ability.ApplicationStateChangeCallback';
let applicationStateChangeCallback: ApplicationStateChangeCallback = {
onApplicationForeground() {
console.info('applicationStateChangeCallback onApplicationForeground');
},
onApplicationBackground() {
console.info('applicationStateChangeCallback onApplicationBackground');
}
}
export default class MyAbility extends UIAbility {
onCreate() {
console.log('MyAbility onCreate');
// 1.获取applicationContext
let applicationContext = this.context.getApplicationContext();
// 2.通过applicationContext注册应用前后台状态监听
if (applicationContext != undefined) {
applicationContext.on('applicationStateChange', applicationStateChangeCallback);
}
console.log('Resgiter applicationStateChangeCallback');
}
onDestroy() {
let applicationContext = this.context.getApplicationContext();
// 1.通过applicationContext解除注册应用前后台状态监听
if (applicationContext != undefined) {
applicationContext.off('applicationStateChange', applicationStateChangeCallback);
}
}
}
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