demo update

Signed-off-by: Nhuweiqi <huweiqi1@huawei.com>
Change-Id: I29fe39789981bd5de5b2b2aa71695579c0cb2140

zh-cn/application-dev/reference/apis/js-apis-photoAccessHelper.md

@@ -446,7 +446,7 @@ async function example() {
   let photoType = photoAccessHelper.PhotoType.IMAGE;
   let extension = 'jpg';
   phAccessHelper.createAsset(photoType, extension, (err, uri) => {
-    if (photoAsset != undefined) {
+    if (uri != undefined) {
       console.info('createAsset uri' + uri);
       console.info('createAsset successfully');
     } else {
@@ -2856,10 +2856,10 @@ getAssets(options: FetchOptions, callback: AsyncCallback<FetchResult<Photo
 import dataSharePredicates from '@ohos.data.dataSharePredicates';
 
 async function example() {
-  console.info('albumGetPhotoAssetsDemoCallback');
-
+  console.info('albumGetAssetsDemoCallback');
   let predicates = new dataSharePredicates.DataSharePredicates();
   let albumFetchOptions = {
+    fetchColumns: [],
     predicates: predicates
   };
   let fetchOption = {
@@ -2914,10 +2914,11 @@ getAssets(options: FetchOptions): Promise<FetchResult<PhotoAsset>>;
 import dataSharePredicates from '@ohos.data.dataSharePredicates';
 
 async function example() {
-  console.info('albumGetPhotoAssetsDemoPromise');
+  console.info('albumGetAssetsDemoPromise');
 
   let predicates = new dataSharePredicates.DataSharePredicates();
   let albumFetchOptions = {
+    fetchColumns: [],
     predicates: predicates
   };
   let fetchOption = {
@@ -2967,6 +2968,7 @@ async function example() {
   console.info('albumCommitModifyDemo');
   let predicates = new dataSharePredicates.DataSharePredicates();
   let albumFetchOptions = {
+    fetchColumns: [],
     predicates: predicates
   };
   const albumList = await phAccessHelper.getAlbums(photoAccessHelper.AlbumType.USER, photoAccessHelper.AlbumSubtype.USER_GENERIC, albumFetchOptions);
@@ -3015,6 +3017,7 @@ async function example() {
   console.info('albumCommitModifyDemo');
   let predicates = new dataSharePredicates.DataSharePredicates();
   let albumFetchOptions = {
+    fetchColumns: [],
     predicates: predicates
   };
   const albumList = await phAccessHelper.getAlbums(photoAccessHelper.AlbumType.USER, photoAccessHelper.AlbumSubtype.USER_GENERIC, albumFetchOptions);
@@ -3496,6 +3499,131 @@ async function example() {
 }
 ```
 
+### setCoverUri
+
+setCoverUri(uri: string, callback: AsyncCallback<void>): void;
+
+设置相册封面，该方法使用callback形式来返回结果。
+
+**注意**：此接口只可修改用户相册封面，不允许修改系统相册封面。
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.WRITE_IMAGEVIDEO
+
+**系统能力**：SystemCapability.FileManagement.PhotoAccessHelper.Core
+
+**参数：**
+
+| 参数名   | 类型                      | 必填 | 说明       |
+| -------- | ------------------------- | ---- | ---------- |
+| uri | string | 是   | 待设置为相册封面文件的uri。 |
+| callback | AsyncCallback<void> | 是   | callback返回void。 |
+
+**错误码：**
+
+接口抛出错误码的详细介绍请参见[通用错误码](../errorcodes/errorcode-universal.md)。
+
+| 错误码ID | 错误信息 |
+| -------- | ---------------------------------------- |
+| 202   | Called by non-system application.                |
+| 401   | if parameter is invalid.         |
+
+**示例：**
+
+```ts
+import dataSharePredicates from '@ohos.data.dataSharePredicates';
+
+async function example() {
+  try {
+    console.info('setCoverUriDemoCallback');
+    let predicates = new dataSharePredicates.DataSharePredicates();
+    let fetchOption = {
+      fetchColumns: [],
+      predicates: predicates
+    };
+    let albumFetchResult = await phAccessHelper.getAlbums(photoAccessHelper.AlbumType.USER, photoAccessHelper.AlbumSubtype.USER_GENERIC);
+    let album = await albumFetchResult.getFirstObject();
+    let fetchResult = await album.getAssets(fetchOption);
+    let asset = await fetchResult.getFirstObject();
+    album.setCoverUri(asset.uri, (err) => {
+      if (err === undefined) {
+        console.info('album setCoverUri successfully');
+      } else {
+        console.error('album setCoverUri failed with error: ' + err);
+      }
+    });
+  } catch (err) {
+    console.error('setCoverUriDemoCallback failed with error: ' + err);
+  }
+}
+```
+
+### setCoverUri
+
+setCoverUri(uri: string): Promise<void>;
+
+设置相册封面，该方法使用Promise来返回结果。
+
+**注意**：此接口只可修改用户相册封面，不允许修改系统相册封面。
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.WRITE_IMAGEVIDEO
+
+**系统能力**：SystemCapability.FileManagement.PhotoAccessHelper.Core
+
+**参数：**
+
+| 参数名   | 类型                      | 必填 | 说明       |
+| -------- | ------------------------- | ---- | ---------- |
+| uri | string | 是   | 待设置为相册封面文件的uri。 |
+
+**返回值：**
+
+| 类型                                    | 说明              |
+| --------------------------------------- | ----------------- |
+|Promise<void> | Promise对象，返回void。 |
+
+**错误码：**
+
+接口抛出错误码的详细介绍请参见[通用错误码](../errorcodes/errorcode-universal.md)。
+
+| 错误码ID | 错误信息 |
+| -------- | ---------------------------------------- |
+| 202   | Called by non-system application.                |
+| 401   | if parameter is invalid.         |
+
+**示例：**
+
+```ts
+import dataSharePredicates from '@ohos.data.dataSharePredicates';
+
+async function example() {
+  try {
+    console.info('setCoverUriDemoCallback');
+    let predicates = new dataSharePredicates.DataSharePredicates();
+    let fetchOption = {
+      fetchColumns: [],
+      predicates: predicates
+    };
+    let albumFetchResult = await phAccessHelper.getAlbums(photoAccessHelper.AlbumType.USER, photoAccessHelper.AlbumSubtype.USER_GENERIC);
+    let album = await albumFetchResult.getFirstObject();
+    let fetchResult = await album.getAssets(fetchOption);
+    let asset = await fetchResult.getFirstObject();
+    album.setCoverUri(asset.uri, (err) => {
+      if (err === undefined) {
+        console.info('album setCoverUri successfully');
+      } else {
+        console.error('album setCoverUri failed with error: ' + err);
+      }
+    });
+  } catch (err) {
+    console.error('setCoverUriDemoCallback failed with error: ' + err);
+  }
+}
+```
+
 ## MemberType
 
 成员类型。