ApplicationStateObserver

The ApplicationStateObserver module defines an observer to listen for application state changes. It can be used as an input parameter in on to listen for lifecycle changes of the current application.

NOTE

The initial APIs of this module are supported since API version 14. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import { appManager } from '@kit.AbilityKit';

ApplicationStateObserver.onForegroundApplicationChanged

onForegroundApplicationChanged(appStateData: AppStateData): void

Called when the foreground or background state of an application changes.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

ApplicationStateObserver.onAbilityStateChanged

onAbilityStateChanged(abilityStateData: AbilityStateData): void

Called when the ability state changes.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

ApplicationStateObserver.onProcessCreated

onProcessCreated(processData: ProcessData): void

Called when a process is created.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

ApplicationStateObserver.onProcessDied

onProcessDied(processData: ProcessData): void

Called when a process is destroyed.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

ApplicationStateObserver.onProcessStateChanged

onProcessStateChanged(processData: ProcessData): void

Called when the process state is changed.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

ApplicationStateObserver.onAppStarted

onAppStarted(appStateData: AppStateData): void

Called when the first process of the application is created.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

ApplicationStateObserver.onAppStopped

onAppStopped(appStateData: AppStateData): void

Called when the last process of the application is destroyed.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

ProcessData

type ProcessData = _ProcessData.default

Defines the process data.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Example

import { appManager } from '@kit.AbilityKit';

let applicationStateObserver: appManager.ApplicationStateObserver = {
  onForegroundApplicationChanged(appStateData) {
    console.log(`onForegroundApplicationChanged, appStateData: ${JSON.stringify(appStateData)}.`);
  },
  onAbilityStateChanged(abilityStateData) {
    console.log(`onAbilityStateChanged, abilityStateData: ${JSON.stringify(abilityStateData)}.`);
  },
  onProcessCreated(processData) {
    console.log(`onProcessCreated, processData: ${JSON.stringify(processData)}.`);
  },
  onProcessDied(processData) {
    console.log(`onProcessDied, processData: ${JSON.stringify(processData)}.`);
  },
  onProcessStateChanged(processData) {
    console.log(`onProcessStateChanged, processData: ${JSON.stringify(processData)}.`);
  },
  onAppStarted(appStateData) {
    console.log(`onAppStarted, appStateData: ${JSON.stringify(appStateData)}.`);
  },
  onAppStopped(appStateData) {
    console.log(`onAppStopped, appStateData: ${JSON.stringify(appStateData)}.`);
  }
};
let observerCode = appManager.on('applicationState', applicationStateObserver);

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