ApplicationContext
ApplicationContext模块提供开发者应用级别的的上下文的能力,包括提供注册及取消注册应用内组件生命周期的监听接口。
说明:
开发前请熟悉鸿蒙开发指导文档: gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md点击或者复制转到。
本模块首批接口从API version 9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。
使用说明
在使用ApplicationContext的功能前,需要通过context的实例获取。
let applicationContext = this.context.getApplicationContext();
ApplicationContext.registerAbilityLifecycleCallback
registerAbilityLifecycleCallback(callback: AbilityLifecycleCallback): number;
注册监听应用内生命周期
系统能力:SystemCapability.Ability.AbilityRuntime.Core
参数:
参数名 | 类型 | 必填 | 说明 |
---|---|---|---|
AbilityLifecycleCallback | callback | 是 | 回调方法,返回注册监听事件的id |
返回值:
类型 | 说明 |
---|---|
number | 返回的此次注册监听生命周期的id(每次注册该id会自增+1,当超过监听上限数量2^63-1时,返回-1) |
示例:
import AbilityStage from "@ohos.application.AbilityStage";
var lifecycleid;
export default class MyAbilityStage extends AbilityStage {
onCreate() {
console.log("MyAbilityStage onCreate")
let AbilityLifecycleCallback = {
onAbilityCreate(ability){
console.log("AbilityLifecycleCallback onAbilityCreate ability:" + JSON.stringify(ability));
},
onAbilityWindowStageCreate(ability){
console.log("AbilityLifecycleCallback onAbilityWindowStageCreate ability:" + JSON.stringify(ability));
},
onAbilityWindowStageDestroy(ability){
console.log("AbilityLifecycleCallback onAbilityWindowStageDestroy ability:" + JSON.stringify(ability));
},
onAbilityDestroy(ability){
console.log("AbilityLifecycleCallback onAbilityDestroy ability:" + JSON.stringify(ability));
},
onAbilityForeground(ability){
console.log("AbilityLifecycleCallback onAbilityForeground ability:" + JSON.stringify(ability));
},
onAbilityBackground(ability){
console.log("AbilityLifecycleCallback onAbilityBackground ability:" + JSON.stringify(ability));
},
onAbilityContinue(ability){
console.log("AbilityLifecycleCallback onAbilityContinue ability:" + JSON.stringify(ability));
}
}
// 1.通过context属性获取applicationContext
let applicationContext = this.context.getApplicationContext();
// 2.通过applicationContext注册监听应用内生命周期
lifecycleid = applicationContext.registerAbilityLifecycleCallback(AbilityLifecycleCallback);
console.log("registerAbilityLifecycleCallback number: " + JSON.stringify(lifecycleid));
}
onDestroy() {
let applicationContext = this.context.getApplicationContext();
applicationContext.unregisterAbilityLifecycleCallback(lifecycleid, (error, data) => {
console.log("unregisterAbilityLifecycleCallback success, err: " + JSON.stringify(error));
});
}
}
ApplicationContext.unregisterAbilityLifecycleCallback
unregisterAbilityLifecycleCallback(callbackId: number, callback: AsyncCallback<void>): void;
取消监听应用内生命周期
系统能力:SystemCapability.Ability.AbilityRuntime.Core
参数:
参数名 | 类型 | 必填 | 说明 | |
---|---|---|---|---|
callbackId | number | 是 | 注册监听应用内生命周期的id | |
AsyncCallback | callback | 是 | 回调方法 | HarmonyOS与OpenHarmony鸿蒙文档籽料:mau123789是v直接拿 |
示例:
let applicationContext = this.context.getApplicationContext();
let lifecycleid=1
console.log("stage applicationContext: " + JSON.stringify(applicationContext));
applicationContext.unregisterAbilityLifecycleCallback(lifecycleid, (error, data) => {
console.log("unregisterAbilityLifecycleCallback success, err: " + JSON.stringify(error));
});