1# 创建PageAbility
2
3
4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：
5
6```ts
7import featureAbility from '@ohos.ability.featureAbility';
8import hilog from '@ohos.hilog';
9
10const TAG: string = 'MainAbility';
11const domain: number = 0xFF00;
12
13class MainAbility {
14  onCreate() {
15    // 获取context并调用相关方法
16    let context = featureAbility.getContext();
17    context.getBundleName((data, bundleName) => {
18      hilog.info(domain, TAG, 'ability bundleName:' ,bundleName);
19    });
20    hilog.info(domain, TAG, 'Application onCreate');
21  }
22
23  onDestroy() {
24    hilog.info(domain, TAG, 'Application onDestroy');
25  }
26
27  onShow(): void {
28    hilog.info(domain, TAG, 'Application onShow');
29  }
30
31  onHide(): void {
32    hilog.info(domain, TAG, 'Application onHide');
33  }
34
35  onActive(): void {
36    hilog.info(domain, TAG, 'Application onActive');
37  }
38
39  onInactive(): void {
40    hilog.info(domain, TAG, 'Application onInactive');
41  }
42
43  onNewWant() {
44    hilog.info(domain, TAG, 'Application onNewWant');
45  }
46}
47
48export default new MainAbility();
49```
50
51
52PageAbility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：
53
54```json
55{
56  ...
57  "module": {
58    ...
59    "abilities": [
60      {
61        "skills": [
62          {
63            "entities": [
64              "entity.system.home"
65            ],
66            "actions": [
67              "action.system.home"
68            ]
69          }
70        ],
71        "orientation": "unspecified",
72        "formsEnabled": false,
73        "name": ".MainAbility",
74        "srcLanguage": "ets",
75        "srcPath": "MainAbility",
76        "icon": "$media:icon",
77        "description": "$string:MainAbility_desc",
78        "label": "$string:MainAbility_label",
79        "type": "page",
80        "visible": true,
81        "launchType": "singleton"
82      },
83      ...
84    ]
85    ...
86  }
87}
88```
89
90
91FA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。
92
93
94  **表1** featureAbility接口说明
95
96| 接口名 | 接口描述 |
97| -------- | -------- |
98| getContext() | 获取应用上下文。 |
99
100
101通过getContext获取应用上下文并获取分布式目录的示例如下：
102
103```ts
104import featureAbility from '@ohos.ability.featureAbility';
105import fs from '@ohos.file.fs';
106import promptAction from '@ohos.promptAction';
107import hilog from '@ohos.hilog';
108
109const TAG: string = 'PagePageAbilityFirst';
110const domain: number = 0xFF00;
111```
112```ts
113(async (): Promise<void> => {
114  let dir: string;
115  try {
116    hilog.info(domain, TAG, 'Begin to getOrCreateDistributedDir');
117    dir = await featureAbility.getContext().getOrCreateDistributedDir();
118    promptAction.showToast({
119      message: dir
120    });
121    hilog.info(domain, TAG, 'distribute dir is ' + dir);
122    let fd: number;
123    let path = dir + '/a.txt';
124    fd = fs.openSync(path, fs.OpenMode.READ_WRITE).fd;
125    fs.close(fd);
126  } catch (error) {
127    hilog.error(domain, TAG, 'getOrCreateDistributedDir failed with : ' + error);
128  }
129})()
130```
131