創(chuàng)建PageAbility
通過DevEco Studio開發(fā)平臺創(chuàng)建PageAbility時,DevEco Studio會在app.js/app.ets中默認生成onCreate()和onDestroy()方法,其他方法需要開發(fā)者自行實現(xiàn)。接口說明參見前述章節(jié),創(chuàng)建PageAbility示例如下:
import featureAbility from '@ohos.ability.featureAbility';
import hilog from '@ohos.hilog';
const TAG: string = 'MainAbility';
const domain: number = 0xFF00;
class MainAbility {
onCreate() {
// 獲取context并調(diào)用相關(guān)方法
let context = featureAbility.getContext();
context.getBundleName((data, bundleName) = > {
hilog.info(domain, TAG, 'ability bundleName:' ,bundleName);
});
hilog.info(domain, TAG, 'Application onCreate');
}
onDestroy() {
hilog.info(domain, TAG, 'Application onDestroy');
}
onShow(): void {
hilog.info(domain, TAG, 'Application onShow');
}
onHide(): void {
hilog.info(domain, TAG, 'Application onHide');
}
onActive(): void {
hilog.info(domain, TAG, 'Application onActive');
}
onInactive(): void {
hilog.info(domain, TAG, 'Application onInactive');
}
onNewWant() {
hilog.info(domain, TAG, 'Application onNewWant');
}
}
export default new MainAbility();
PageAbility創(chuàng)建成功后,其abilities相關(guān)的配置項在config.json中體現(xiàn),一個名字為EntryAbility的config.json配置文件示例如下:
{
...
"module": {
...
"abilities": [
{
"skills": [
{
"entities": [
"entity.system.home"
],
"actions": [
"action.system.home"
]
}
],
"orientation": "unspecified",
"formsEnabled": false,
"name": ".MainAbility",
"srcLanguage": "ets",
"srcPath": "MainAbility",
"icon": "$media:icon",
"description": "$string:MainAbility_desc",
"label": "$string:MainAbility_label",
"type": "page",
"visible": true,
"launchType": "singleton"
},
...
]
...
}
}
FA模型中,可以通過featureAbility的getContext接口獲取應(yīng)用上下文,進而使用上下文提供的能力。
表1 featureAbility接口說明
接口名 | 接口描述 |
---|---|
getContext() | 獲取應(yīng)用上下文。開發(fā)前請熟悉鴻蒙開發(fā)指導文檔:gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md 點擊或者復(fù)制轉(zhuǎn)到。 |
通過getContext獲取應(yīng)用上下文并獲取分布式目錄的示例如下:
import featureAbility from '@ohos.ability.featureAbility';
import fs from '@ohos.file.fs';
import promptAction from '@ohos.promptAction';
import hilog from '@ohos.hilog';
const TAG: string = 'PagePageAbilityFirst';
const domain: number = 0xFF00;
(async (): Promise< void > = > {
let dir: string;
try {
hilog.info(domain, TAG, 'Begin to getOrCreateDistributedDir');
dir = await featureAbility.getContext().getOrCreateDistributedDir();
promptAction.showToast({
message: dir
});
hilog.info(domain, TAG, '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) {
hilog.error(domain, TAG, 'getOrCreateDistributedDir failed with : ' + error);
}
})()
審核編輯 黃宇
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