harmony 鸿蒙创建PageAbility
创建PageAbility
开发者需要重写app.js/app.ets中的生命周期回调函数,开发者通过DevEco Studio开发平台创建PageAbility时,DevEco Studio会在app.js/app.ets中默认生成onCreate()和onDestroy()方法,其他方法需要开发者自行实现。接口说明参见前述章节,创建PageAbility示例如下:
class EntryAbility {
onCreate() {
console.info('Application onCreate')
}
onDestroy() {
console.info('Application onDestroy')
}
onShow() {
console.info('Application onShow')
}
onHide() {
console.info('Application onHide')
}
onActive() {
console.info('Application onActive')
}
onInactive() {
console.info('Application onInactive')
}
onNewWant() {
console.info('Application onNewWant')
}
}
export default new EntryAbility()
PageAbility创建成功后,其abilities相关的配置项在config.json中体现,一个名字为EntryAbility的config.json配置文件示例如下:
{
"abilities": [
{
"skills": [
{
"entities": [
"entity.system.home"
],
"actions": [
"action.system.home"
]
}
],
"orientation": "unspecified",
"visible": true,
"srcPath": "EntryAbility",
"name": ".EntryAbility",
"srcLanguage": "ets",
"icon": "$media:icon",
"description": "$string:EntryAbility_desc",
"formsEnabled": false,
"label": "$string:EntryAbility_label",
"type": "page",
"launchType": "singleton"
}
]
}
FA模型中,可以通过featureAbility的getContext接口获取应用上下文,进而使用上下文提供的能力。
表1 featureAbility接口说明
接口名 | 接口描述 |
---|---|
getContext() | 获取应用上下文。 |
通过getContext获取应用上下文并获取分布式目录的示例如下:
import featureAbility from '@ohos.ability.featureAbility';
import fs from '@ohos.file.fs';
(async () => {
let dir: string;
try {
console.info('Begin to getOrCreateDistributedDir');
dir = await featureAbility.getContext().getOrCreateDistributedDir();
console.info('distribute dir is ' + dir);
let fd: number;
let path = dir + "/a.txt";
fd = fs.openSync(path, fs.OpenMode.READ_WRITE).fd;
fs.close(fd);
} catch (error) {
console.error('getOrCreateDistributedDir failed with ' + error);
}
})()
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