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提交 518f86f8 编写于 作者: H huweiqi
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fixed 330e965 from https://gitee.com/weiqi-hu/docs/pulls/14996 

modify mediaLibrary.md
Signed-off-by: Nhuweiqi <huweiqi1@huawei.com>
Change-Id: I80d51c747e6506719ba8d41a6dcd1569985f2ce9
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zh-cn/application-dev/reference/apis/js-apis-medialibrary.md
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# @ohos.multimedia.medialibrary (媒体库管理)
> ![icon-note.gif](public_sys-resources/icon-note.gif) **说明：**
> **说明：**
> 该组件从API Version 6开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
## 导入模块
......@@ -33,6 +33,7 @@ getMediaLibrary(context: Context): MediaLibrary
**示例：（从API Version 9开始）**
```ts
// 获取mediaLibrary实例，后续用到此实例均采用此处获取的实例
const context = getContext(this);
let media = mediaLibrary.getMediaLibrary(context);
```
......@@ -91,46 +92,59 @@ getFileAssets(options: MediaFetchOptions, callback: AsyncCallback&lt;FetchFileRe
**示例：**
```js
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let imagesFetchOp = {
async function example() {
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
// 创建文件获取选项，此处参数为获取image类型的文件资源
let imagesFetchOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
};
media.getFileAssets(imagesFetchOp, (error, fetchFileResult) => {
};
// 获取文件资源，使用callback方式返回异步结果
media.getFileAssets(imagesFetchOp, (error, fetchFileResult) => {
// 判断获取的文件资源的检索结果集是否为undefined，若为undefined则接口调用失败
if (fetchFileResult == undefined) {
console.error('Failed to get fetchFileResult: ' + error);
console.error('get fetchFileResult failed with error: ' + error);
return;
}
// 获取文件检索结果集中的总数
const count = fetchFileResult.getCount();
// 判断结果集中的数量是否小于0，小于0时表示接口调用失败
if (count < 0) {
console.error('Failed to get count from fetchFileResult: count: ' + count);
console.error('get count from fetchFileResult failed, count: ' + count);
return;
}
// 判断结果集中的数量是否等于0，等于0时表示接口调用成功，但是检索结果集为空，请检查文件获取选项参数配置是否有误和设备中是否存在相应文件
if (count == 0) {
console.info('The count of fetchFileResult is zero');
return;
}
console.info('Get fetchFileResult success, count: ' + count);
fetchFileResult.getFirstObject((err, fileAsset) => {
console.info('Get fetchFileResult successfully, count: ' + count);
// 获取文件检索结果集中的第一个资源，使用callback方式返回异步结果
fetchFileResult.getFirstObject((error, fileAsset) => {
// 检查获取的第一个资源是否为undefined，若为undefined则接口调用失败
if (fileAsset == undefined) {
console.error('Failed to get first object: ' + err);
console.error('get first object failed with error: ' + error);
return;
}
console.info('fileAsset.displayName ' + ': ' + fileAsset.displayName);
console.info('fileAsset.displayName ' + '0 : ' + fileAsset.displayName);
// 调用 getNextObject 接口获取下一个资源，直到最后一个
for (let i = 1; i < count; i++) {
fetchFileResult.getNextObject((err, fileAsset) => {
fetchFileResult.getNextObject((error, fileAsset) => {
if (fileAsset == undefined) {
console.error('Failed to get next object: ' + err);
console.error('get next object failed with error: ' + error);
return;
}
console.info('fileAsset.displayName ' + i + ': ' + fileAsset.displayName);
})
}
});
});
// 释放FetchFileResult实例并使其失效。无法调用其他方法
fetchFileResult.close();
});
}
```
### getFileAssets<sup>7+</sup>
getFileAssets(options: MediaFetchOptions): Promise&lt;FetchFileResult&gt;
......@@ -156,38 +170,51 @@ getFileAssets(options: MediaFetchOptions): Promise&lt;FetchFileResult&gt;
**示例：**
```js
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let imagesFetchOp = {
async function example() {
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
// 创建文件获取选项，此处参数为获取image类型的文件资源
let imagesFetchOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
};
media.getFileAssets(imagesFetchOp).then(function(fetchFileResult) {
};
// 获取文件资源，使用Promise方式返回结果
media.getFileAssets(imagesFetchOp).then((fetchFileResult) => {
// 获取文件检索结果集中的总数
const count = fetchFileResult.getCount();
// 判断结果集中的数量是否小于0，小于0时表示接口调用失败
if (count < 0) {
console.error('Failed to get count from fetchFileResult: count: ' + count);
console.error('get count from fetchFileResult failed, count: ' + count);
return;
}
// 判断结果集中的数量是否等于0，等于0时表示接口调用成功，但是检索结果集为空，请检查文件获取选项参数配置是否有误和设备中是否存在相应文件
if (count == 0) {
console.info('The count of fetchFileResult is zero');
return;
}
console.info('Get fetchFileResult success, count: ' + count);
fetchFileResult.getFirstObject().then(function(fileAsset) {
console.info('fileAsset.displayName ' + ': ' + fileAsset.displayName);
console.info('Get fetchFileResult successfully, count: ' + count);
// 获取文件检索结果集中的第一个资源，使用Promise方式返回异步结果
fetchFileResult.getFirstObject().then((fileAsset) => {
console.info('fileAsset.displayName ' + '0 : ' + fileAsset.displayName);
// 调用 getNextObject 接口获取下一个资源，直到最后一个
for (let i = 1; i < count; i++) {
fetchFileResult.getNextObject().then(function(fileAsset) {
console.info('fileAsset.displayName ' + ': ' + fileAsset.displayName);
}).catch(function(err) {
console.error('Failed to get next object: ' + err);
fetchFileResult.getNextObject().then((fileAsset) => {
console.info('fileAsset.displayName ' + i + ': ' + fileAsset.displayName);
}).catch((error) => {
console.error('get next object failed with error: ' + error);
})
}
}).catch(function(err) {
console.error('Failed to get first object: ' + err);
}).catch((error) => {
// 调用getFirstObject接口失败
console.error('get first object failed with error: ' + error);
});
}).catch(function(err){
console.error("Failed to get file assets: " + err);
});
// 释放FetchFileResult实例并使其失效。无法调用其他方法
fetchFileResult.close();
}).catch((error) => {
// 调用getFileAssets接口失败
console.error('get file assets failed with error: ' + error);
});
}
```
### on<sup>8+</sup>
......@@ -231,7 +258,7 @@ off(type: 'deviceChange'&#124;'albumChange'&#124;'imageChange'&#124;'audioChange
```js
media.off('imageChange', () => {
// stop listening success
// stop listening successfully
})
```
......@@ -262,11 +289,11 @@ async function example() {
let mediaType = mediaLibrary.MediaType.IMAGE;
let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE;
const path = await media.getPublicDirectory(DIR_IMAGE);
media.createAsset(mediaType, 'imageCallBack.jpg', path + 'myPicture/', (err, fileAsset) => {
media.createAsset(mediaType, 'imageCallBack.jpg', path + 'myPicture/', (error, fileAsset) => {
if (fileAsset != undefined) {
console.info('createAsset successfully, message');
} else {
console.error('createAsset failed, message = ' + err);
console.error('createAsset failed with error: ' + error);
}
});
}
......@@ -306,8 +333,8 @@ async function example() {
const path = await media.getPublicDirectory(DIR_IMAGE);
media.createAsset(mediaType, 'imagePromise.jpg', path + 'myPicture/').then((fileAsset) => {
console.info('createAsset successfully, message = ' + JSON.stringify(fileAsset));
}).catch((err) => {
console.error('createAsset failed, message = ' + err);
}).catch((error) => {
console.error('createAsset failed with error: ' + error);
});
}
```
......@@ -348,14 +375,15 @@ async function example() {
const fetchFileResult = await media.getFileAssets(option);
let asset = await fetchFileResult.getFirstObject();
if (asset == undefined) {
console.error('asset not exist')
return
console.error('asset not exist');
return;
}
media.deleteAsset(asset.uri).then(() => {
console.info("deleteAsset successfully");
}).catch((err) => {
console.error("deleteAsset failed with error:"+ err);
console.info('deleteAsset successfully');
}).catch((error) => {
console.error('deleteAsset failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -390,16 +418,17 @@ async function example() {
const fetchFileResult = await media.getFileAssets(option);
let asset = await fetchFileResult.getFirstObject();
if (asset == undefined) {
console.error('asset not exist')
return
console.error('asset not exist');
return;
}
media.deleteAsset(asset.uri, (err) => {
if (err != undefined) {
console.info("deleteAsset successfully");
media.deleteAsset(asset.uri, (error) => {
if (error != undefined) {
console.error('deleteAsset failed with error: ' + error);
} else {
console.error("deleteAsset failed with error:"+ err);
console.info('deleteAsset successfully');
}
});
fetchFileResult.close();
}
```
......@@ -422,11 +451,11 @@ getPublicDirectory(type: DirectoryType, callback: AsyncCallback&lt;string&gt;):
```js
let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA;
media.getPublicDirectory(DIR_CAMERA, (err, dicResult) => {
media.getPublicDirectory(DIR_CAMERA, (error, dicResult) => {
if (dicResult == 'Camera/') {
console.info('mediaLibraryTest : getPublicDirectory passed');
console.info('getPublicDirectory DIR_CAMERA successfully');
} else {
console.error('mediaLibraryTest : getPublicDirectory failed');
console.error('getPublicDirectory DIR_CAMERA failed with error: ' + error);
}
});
```
......@@ -456,12 +485,15 @@ getPublicDirectory(type: DirectoryType): Promise&lt;string&gt;
```js
async function example() {
let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA;
const dicResult = await media.getPublicDirectory(DIR_CAMERA);
media.getPublicDirectory(DIR_CAMERA).then((dicResult) => {
if (dicResult == 'Camera/') {
console.info('MediaLibraryTest : getPublicDirectory');
console.info('getPublicDirectory DIR_CAMERA successfully');
} else {
console.error('MediaLibraryTest : getPublicDirectory failed');
console.error('getPublicDirectory DIR_CAMERA failed');
}
}).catch((error) => {
console.error('getPublicDirectory failed with error: ' + error);
});
}
```
......@@ -485,19 +517,19 @@ getAlbums(options: MediaFetchOptions, callback: AsyncCallback<Array&lt;Album&gt;
**示例：**
```js
let AlbumNoArgsfetchOp = {
async function example() {
let AlbumNoArgsfetchOp = {
selections: '',
selectionArgs: [],
};
media.getAlbums(AlbumNoArgsfetchOp, (err, albumList) => {
};
media.getAlbums(AlbumNoArgsfetchOp, (error, albumList) => {
if (albumList != undefined) {
const album = albumList[0];
console.info('album.albumName = ' + album.albumName);
console.info('album.count = ' + album.count);
console.info('getAlbums successfully: ' + JSON.stringify(albumList));
} else {
console.error('getAlbum fail, message = ' + err);
console.error('getAlbums failed with error: ' + error);
}
})
})
}
```
### getAlbums<sup>7+</sup>
......@@ -525,15 +557,17 @@ getAlbums(options: MediaFetchOptions): Promise<Array&lt;Album&gt;>
**示例：**
```js
let AlbumNoArgsfetchOp = {
async function example() {
let AlbumNoArgsfetchOp = {
selections: '',
selectionArgs: [],
};
media.getAlbums(AlbumNoArgsfetchOp).then(function(albumList){
console.info("getAlbums successfully:"+ JSON.stringify(albumList));
}).catch(function(err){
console.error("getAlbums failed with error: " + err);
});
};
media.getAlbums(AlbumNoArgsfetchOp).then((albumList) => {
console.info('getAlbums successfully: ' + JSON.stringify(albumList));
}).catch((error) => {
console.error('getAlbums failed with error: ' + error);
});
}
```
### release<sup>8+</sup>
......@@ -549,12 +583,12 @@ release(callback: AsyncCallback&lt;void&gt;): void
| 参数名 | 类型 | 必填 | 说明 |
| -------- | ------------------------- | ---- | ---------- |
| callback | AsyncCallback&lt;void&gt; | 是 | 回调表示成功还是失败 |
| callback | AsyncCallback&lt;void&gt; | 是 | 无返回值 |
**示例：**
```js
media.release((err) => {
media.release(() => {
// do something
});
```
......@@ -601,16 +635,16 @@ storeMediaAsset(option: MediaAssetOption, callback: AsyncCallback&lt;string&gt;)
```js
let option = {
src : "/data/storage/el2/base/haps/entry/image.png",
mimeType : "image/*",
relativePath : "Pictures/"
src : '/data/storage/el2/base/haps/entry/image.png',
mimeType : 'image/*',
relativePath : 'Pictures/'
};
mediaLibrary.getMediaLibrary().storeMediaAsset(option, (err, value) => {
if (err) {
console.error("An error occurred when storing media resources.");
mediaLibrary.getMediaLibrary().storeMediaAsset(option, (error, value) => {
if (error) {
console.error('storeMediaAsset failed with error: ' + error);
return;
}
console.info("Media resources stored. ");
console.info('Media resources stored. ');
// Obtain the URI that stores media resources.
});
```
......@@ -642,15 +676,15 @@ storeMediaAsset(option: MediaAssetOption): Promise&lt;string&gt;
```js
let option = {
src : "/data/storage/el2/base/haps/entry/image.png",
mimeType : "image/*",
relativePath : "Pictures/"
src : '/data/storage/el2/base/haps/entry/image.png',
mimeType : 'image/*',
relativePath : 'Pictures/'
};
mediaLibrary.getMediaLibrary().storeMediaAsset(option).then((value) => {
console.info("Media resources stored.");
console.info('Media resources stored.');
// Obtain the URI that stores media resources.
}).catch((err) => {
console.error("An error occurred when storing media resources.");
}).catch((error) => {
console.error('storeMediaAsset failed with error: ' + error);
});
```
......@@ -669,7 +703,7 @@ startImagePreview(images: Array&lt;string&gt;, index: number, callback: AsyncCal
| 参数名 | 类型 | 必填 | 说明 |
| -------- | ------------------------- | ---- | ---------------------------------------- |
| images | Array&lt;string&gt; | 是 | 预览的图片URI（"https://"，"datashare://"）列表。 |
| images | Array&lt;string&gt; | 是 | 预览的图片URI（'https://'，'datashare://'）列表。 |
| index | number | 是 | 开始显示的图片序号。 |
| callback | AsyncCallback&lt;void&gt; | 是 | 图片预览回调，失败时返回错误信息。 |
......@@ -677,22 +711,22 @@ startImagePreview(images: Array&lt;string&gt;, index: number, callback: AsyncCal
```js
let images = [
"datashare:///media/xxxx/2",
"datashare:///media/xxxx/3"
'datashare:///media/xxxx/2',
'datashare:///media/xxxx/3'
];
/* 网络图片使用方式
let images = [
"https://media.xxxx.com/image1.jpg",
"https://media.xxxx.com/image2.jpg"
'https://media.xxxx.com/image1.jpg',
'https://media.xxxx.com/image2.jpg'
];
*/
let index = 1;
mediaLibrary.getMediaLibrary().startImagePreview(images, index, (err) => {
if (err) {
console.error("An error occurred when previewing the images.");
mediaLibrary.getMediaLibrary().startImagePreview(images, index, (error) => {
if (error) {
console.error('startImagePreview failed with error: ' + error);
return;
}
console.info("Succeeded in previewing the images.");
console.info('Succeeded in previewing the images.');
});
```
......@@ -711,28 +745,28 @@ startImagePreview(images: Array&lt;string&gt;, callback: AsyncCallback&lt;void&g
| 参数名 | 类型 | 必填 | 说明 |
| -------- | ------------------------- | ---- | ---------------------------------------- |
| images | Array&lt;string&gt; | 是 | 预览的图片URI（"https://"，"datashare://"）列表。 |
| images | Array&lt;string&gt; | 是 | 预览的图片URI（'https://'，'datashare://'）列表。 |
| callback | AsyncCallback&lt;void&gt; | 是 | 图片预览回调，失败时返回错误信息。 |
**示例：**
```js
let images = [
"datashare:///media/xxxx/2",
"datashare:///media/xxxx/3"
'datashare:///media/xxxx/2',
'datashare:///media/xxxx/3'
];
/* 网络图片使用方式
let images = [
"https://media.xxxx.com/image1.jpg",
"https://media.xxxx.com/image2.jpg"
'https://media.xxxx.com/image1.jpg',
'https://media.xxxx.com/image2.jpg'
];
*/
mediaLibrary.getMediaLibrary().startImagePreview(images, (err) => {
if (err) {
console.error("An error occurred when previewing the images.");
mediaLibrary.getMediaLibrary().startImagePreview(images, (error) => {
if (error) {
console.error('startImagePreview failed with error: ' + error);
return;
}
console.info("Succeeded in previewing the images.");
console.info('Succeeded in previewing the images.');
});
```
......@@ -751,7 +785,7 @@ startImagePreview(images: Array&lt;string&gt;, index?: number): Promise&lt;void&
| 参数名 | 类型 | 必填 | 说明 |
| ------ | ------------------- | ---- | ---------------------------------------- |
| images | Array&lt;string&gt; | 是 | 预览的图片URI（"https://"，"datashare://"）列表。 |
| images | Array&lt;string&gt; | 是 | 预览的图片URI（'https://'，'datashare://'）列表。 |
| index | number | 否 | 开始显示的图片序号，不选择时默认为0。 |
**返回值：**
......@@ -764,20 +798,20 @@ startImagePreview(images: Array&lt;string&gt;, index?: number): Promise&lt;void&
```js
let images = [
"datashare:///media/xxxx/2",
"datashare:///media/xxxx/3"
'datashare:///media/xxxx/2',
'datashare:///media/xxxx/3'
];
/* 网络图片使用方式
let images = [
"https://media.xxxx.com/image1.jpg",
"https://media.xxxx.com/image2.jpg"
'https://media.xxxx.com/image1.jpg',
'https://media.xxxx.com/image2.jpg'
];
*/
let index = 1;
mediaLibrary.getMediaLibrary().startImagePreview(images, index).then(() => {
console.info("Succeeded in previewing the images.");
}).catch((err) => {
console.error("An error occurred when previewing the images.");
console.info('Succeeded in previewing the images.');
}).catch((error) => {
console.error('startImagePreview failed with error: ' + error);
});
```
......@@ -803,15 +837,15 @@ startMediaSelect(option: MediaSelectOption, callback: AsyncCallback&lt;Array&lt;
```js
let option : mediaLibrary.MediaSelectOption = {
type : "media",
type : 'media',
count : 2
};
mediaLibrary.getMediaLibrary().startMediaSelect(option, (err, value) => {
if (err) {
console.error("An error occurred when selecting media resources.");
mediaLibrary.getMediaLibrary().startMediaSelect(option, (error, value) => {
if (error) {
console.error('startMediaSelect failed with error: ' + error);
return;
}
console.info("Media resources selected.");
console.info('Media resources selected.');
// Obtain the media selection value.
});
```
......@@ -843,14 +877,14 @@ startMediaSelect(option: MediaSelectOption): Promise&lt;Array&lt;string&gt;&gt;
```js
let option : mediaLibrary.MediaSelectOption = {
type : "media",
type : 'media',
count : 2
};
mediaLibrary.getMediaLibrary().startMediaSelect(option).then((value) => {
console.info("Media resources selected.");
console.info('Media resources selected.');
// Obtain the media selection value.
}).catch((err) => {
console.error("An error occurred when selecting media resources.");
}).catch((error) => {
console.error('startMediaSelect failed with error: ' + error);
});
```
......@@ -878,14 +912,12 @@ getActivePeers(): Promise\<Array\<PeerInfo>>;
async function example() {
media.getActivePeers().then((devicesInfo) => {
if (devicesInfo != undefined) {
for (let i = 0; i < devicesInfo.length; i++) {
console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
}
console.info('get distributed info ' + JSON.stringify(devicesInfo));
} else {
console.info('get distributed info is undefined!')
console.info('get distributed info is undefined!');
}
}).catch((err) => {
console.error("get distributed info failed with error:" + err);
}).catch((error) => {
console.error('get distributed info failed with error: ' + error);
});
}
```
......@@ -912,15 +944,13 @@ getActivePeers(callback: AsyncCallback\<Array\<PeerInfo>>): void;
```js
async function example() {
media.getActivePeers((err, devicesInfo) => {
media.getActivePeers((error, devicesInfo) => {
if (devicesInfo != undefined) {
for (let i = 0; i < devicesInfo.length; i++) {
console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
}
console.info('get distributed info ' + JSON.stringify(devicesInfo));
} else {
console.error('get distributed fail, message = ' + err)
console.error('get distributed failed with error: ' + error);
}
})
});
}
```
......@@ -949,14 +979,12 @@ getAllPeers(): Promise\<Array\<PeerInfo>>;
async function example() {
media.getAllPeers().then((devicesInfo) => {
if (devicesInfo != undefined) {
for (let i = 0; i < devicesInfo.length; i++) {
console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
}
console.info('get distributed info ' + JSON.stringify(devicesInfo));
} else {
console.info('get distributed info is undefined!')
console.info('get distributed info is undefined!');
}
}).catch((err) => {
console.error("get distributed info failed with error: " + err);
}).catch((error) => {
console.error('get distributed info failed with error: ' + error);
});
}
```
......@@ -983,15 +1011,13 @@ getAllPeers(callback: AsyncCallback\<Array\<PeerInfo>>): void;
```js
async function example() {
media.getAllPeers((err, devicesInfo) => {
media.getAllPeers((error, devicesInfo) => {
if (devicesInfo != undefined) {
for (let i = 0; i < devicesInfo.length; i++) {
console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
}
console.info('get distributed info ' + JSON.stringify(devicesInfo));
} else {
console.error('get distributed fail, message = ' + err)
console.error('get distributed failed with error: ' + error);
}
})
});
}
```
......@@ -999,7 +1025,7 @@ async function example() {
提供封装文件属性的方法。
> ![icon-note.gif](public_sys-resources/icon-note.gif) **说明：**
> **说明：**
> 1. title字段默认为去掉后缀的文件名，音频和视频文件会尝试解析文件内容，部分设备写入后在触发扫描时会被还原。
> 2. orientation字段部分设备可能不支持修改，建议使用image组件的[ModifyImageProperty](js-apis-image.md#modifyimageproperty9)接口。
......@@ -1052,19 +1078,23 @@ isDirectory(callback: AsyncCallback&lt;boolean&gt;): void
```js
async function example() {
let fileKeyObj = mediaLibrary.FileKey
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.isDirectory((err, isDirectory) => {
// do something
asset.isDirectory((error, isDirectory) => {
if (error) {
console.error('isDirectory failed with error: ' + error);
} else {
console.info('isDirectory result:' + isDirectory);
}
});
fetchFileResult.close();
}
```
......@@ -1088,21 +1118,21 @@ isDirectory():Promise&lt;boolean&gt;
```js
async function example() {
let fileKeyObj = mediaLibrary.FileKey
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.isDirectory().then(function(isDirectory){
console.info("isDirectory result:"+ isDirectory);
}).catch(function(err){
console.error("isDirectory failed with error: " + err);
asset.isDirectory().then((isDirectory) => {
console.info('isDirectory result:' + isDirectory);
}).catch((error) => {
console.error('isDirectory failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1126,20 +1156,20 @@ commitModify(callback: AsyncCallback&lt;void&gt;): void
```js
async function example() {
let fileKeyObj = mediaLibrary.FileKey
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.title = 'newtitle';
asset.commitModify(() => {
console.info('commitModify success');
console.info('commitModify successfully');
});
fetchFileResult.close();
}
```
......@@ -1163,18 +1193,18 @@ commitModify(): Promise&lt;void&gt;
```js
async function example() {
let fileKeyObj = mediaLibrary.FileKey
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.title = 'newtitle';
asset.commitModify();
await asset.commitModify();
fetchFileResult.close();
}
```
......@@ -1184,7 +1214,7 @@ open(mode: string, callback: AsyncCallback&lt;number&gt;): void
打开当前文件，使用callback方式返回异步结果。
**注意**：当前写操作是互斥的操作，写操作完成后需要调用close进行释放
**注意**：以 'w' 模式打开文件时，返回的fd无法进行读取。但由于不同文件系统实现上的差异，部分用户态文件系统在 'w' 模式打开时会允许用fd读取。若有针对fd的读写行为，建议使用 'rw' 模式打开文件。当前写操作是互斥的操作，写操作完成后需要调用close进行释放。
**需要权限**：ohos.permission.READ_MEDIA or ohos.permission.WRITE_MEDIA
......@@ -1204,12 +1234,12 @@ async function example() {
let mediaType = mediaLibrary.MediaType.IMAGE;
let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE;
const path = await media.getPublicDirectory(DIR_IMAGE);
const asset = await media.createAsset(mediaType, "image00003.jpg", path);
asset.open('rw', (openError, fd) => {
if(fd > 0){
const asset = await media.createAsset(mediaType, 'image00003.jpg', path);
asset.open('rw', (error, fd) => {
if (fd > 0) {
asset.close(fd);
}else{
console.error('File Open Failed!' + openError);
} else {
console.error('File Open failed with error: ' + error);
}
});
}
......@@ -1221,7 +1251,7 @@ open(mode: string): Promise&lt;number&gt;
打开当前文件，使用promise方式返回异步结果。
**注意**：当前写操作是互斥的操作，写操作完成后需要调用close进行释放
**注意**：以 'w' 模式打开文件时，返回的fd无法进行读取。但由于不同文件系统实现上的差异，部分用户态文件系统在 'w' 模式打开时会允许用fd读取。若有针对fd的读写行为，建议使用 'rw' 模式打开文件。当前写操作是互斥的操作，写操作完成后需要调用close进行释放。
**需要权限**：ohos.permission.READ_MEDIA or ohos.permission.WRITE_MEDIA
......@@ -1246,13 +1276,11 @@ async function example() {
let mediaType = mediaLibrary.MediaType.IMAGE;
let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE;
const path = await media.getPublicDirectory(DIR_IMAGE);
const asset = await media.createAsset(mediaType, "image00003.jpg", path);
asset.open('rw')
.then((fd) => {
console.info('File fd!' + fd);
})
.catch((err) => {
console.error('File err!' + err);
const asset = await media.createAsset(mediaType, 'image00003.jpg', path);
asset.open('rw').then((fd) => {
console.info('File open fd: ' + fd);
}).catch((error) => {
console.error('File open failed with error: ' + error);
});
}
```
......@@ -1278,30 +1306,28 @@ close(fd: number, callback: AsyncCallback&lt;void&gt;): void
```js
async function example() {
let fileKeyObj = mediaLibrary.FileKey
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.open('rw').then((fd) => {
console.info('File fd!' + fd);
asset.close(fd, (closeErr) => {
if (closeErr != undefined) {
console.error('mediaLibraryTest : close : FAIL ' + closeErr);
console.error('mediaLibraryTest : ASSET_CALLBACK : FAIL');
console.info('File open fd: ' + fd);
asset.close(fd, (error) => {
if (error) {
console.error('asset.close failed with error: ' + error);
} else {
console.info("=======asset.close success====>");
console.info('asset.close successfully');
}
});
})
.catch((err) => {
console.error('File err!' + err);
}).catch((error) => {
console.error('File open failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1331,31 +1357,26 @@ close(fd: number): Promise&lt;void&gt;
```js
async function example() {
let fileKeyObj = mediaLibrary.FileKey
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.open('rw').then((fd) => {
console.info('File fd!' + fd);
asset.close(fd).then((closeErr) => {
if (closeErr != undefined) {
console.error('mediaLibraryTest : close : FAIL ' + closeErr);
console.error('mediaLibraryTest : ASSET_CALLBACK : FAIL');
} else {
console.info("=======asset.close success====>");
}
asset.close(fd).then(() => {
console.info('asset.close successfully');
}).catch((closeErr) => {
console.error('asset.close fail, closeErr: ' + closeErr);
});
})
.catch((err) => {
console.error('File err!' + err);
}).catch((error) => {
console.error('open File failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1379,19 +1400,23 @@ getThumbnail(callback: AsyncCallback&lt;image.PixelMap&gt;): void
```js
async function example() {
let fileKeyObj = mediaLibrary.FileKey
let fileKeyObj = mediaLibrary.FileKey;
let imageType = mediaLibrary.MediaType.IMAGE;
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.getThumbnail((err, pixelmap) => {
console.info('mediaLibraryTest : getThumbnail Successful '+ pixelmap);
asset.getThumbnail((error, pixelmap) => {
if (error) {
console.error('mediaLibrary getThumbnail failed with error: ' + error);
} else {
console.info('mediaLibrary getThumbnail Successful, pixelmap ' + JSON.stringify(pixelmap));
}
});
fetchFileResult.close();
}
```
......@@ -1421,15 +1446,19 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let size = { width: 720, height: 720 };
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.getThumbnail(size, (err, pixelmap) => {
console.info('mediaLibraryTest : getThumbnail Successful '+ pixelmap);
asset.getThumbnail(size, (error, pixelmap) => {
if (error) {
console.error('mediaLibrary getThumbnail failed with error: ' + error);
} else {
console.info('mediaLibrary getThumbnail Successful, pixelmap ' + JSON.stringify(pixelmap));
}
});
fetchFileResult.close();
}
```
......@@ -1464,19 +1493,17 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let size = { width: 720, height: 720 };
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.getThumbnail(size)
.then((pixelmap) => {
console.info('mediaLibraryTest : getThumbnail Successful '+ pixelmap);
})
.catch((err) => {
console.error('mediaLibraryTest : getThumbnail fail, err: ' + err);
asset.getThumbnail(size).then((pixelmap) => {
console.info('mediaLibrary getThumbnail Successful, pixelmap ' + JSON.stringify(pixelmap));
}).catch((error) => {
console.error('mediaLibrary getThumbnail failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1506,14 +1533,18 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.favorite(true,function(err){
// do something
asset.favorite(true,(error) => {
if (error) {
console.error('mediaLibrary favorite failed with error: ' + error);
} else {
console.info('mediaLibrary favorite Successful');
}
});
fetchFileResult.close();
}
```
......@@ -1548,16 +1579,16 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.favorite(true).then(function() {
console.info("favorite successfully");
}).catch(function(err){
console.error("favorite failed with error: " + err);
asset.favorite(true).then(() => {
console.info('mediaLibrary favorite Successful');
}).catch((error) => {
console.error('mediaLibrary favorite failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1586,18 +1617,18 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.isFavorite((err, isFavorite) => {
if (isFavorite) {
console.info('FileAsset is favorite');
}else{
console.info('FileAsset is not favorite');
asset.isFavorite((error, isFavorite) => {
if (error) {
console.error('mediaLibrary favoriisFavoritete failed with error: ' + error);
} else {
console.info('mediaLibrary isFavorite Successful, isFavorite result: ' + isFavorite);
}
});
fetchFileResult.close();
}
```
......@@ -1626,16 +1657,16 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.isFavorite().then(function(isFavorite){
console.info("isFavorite result:"+ isFavorite);
}).catch(function(err){
console.error("isFavorite failed with error: " + err);
asset.isFavorite().then((isFavorite) => {
console.info('mediaLibrary isFavorite Successful, isFavorite result: ' + isFavorite);
}).catch((error) => {
console.error('mediaLibrary favoriisFavoritete failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1667,15 +1698,18 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.trash(true, trashCallBack);
function trashCallBack(err, trash) {
console.info('mediaLibraryTest : ASSET_CALLBACK ASSET_CALLBACK trash');
asset.trash(true, (error) => {
if (error) {
console.error('mediaLibrary trash failed with error: ' + error);
} else {
console.info('mediaLibrary trash Successful');
}
});
fetchFileResult.close();
}
```
......@@ -1712,16 +1746,16 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.trash(true).then(function() {
console.info("trash successfully");
}).catch(function(err){
console.error("trash failed with error: " + err);
asset.trash(true).then(() => {
console.info('trash successfully');
}).catch((error) => {
console.error('trash failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1750,18 +1784,18 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.isTrash((err, isTrash) => {
if (isTrash == undefined) {
console.error('Failed to get trash state: ' + err);
asset.isTrash((error, isTrash) => {
if (error) {
console.error('Failed to get trash state failed with error: ' + error);
return;
}
console.info('Get trash state success: ' + isTrash);
console.info('Get trash state successfully, isTrash result: ' + isTrash);
});
fetchFileResult.close();
}
```
......@@ -1790,15 +1824,16 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
const fetchFileResult = await media.getFileAssets(getImageOp);
const asset = await fetchFileResult.getFirstObject();
asset.isTrash().then(function(isTrash){
console.info("isTrash result: " + isTrash);
}).catch(function(err){
console.error("isTrash failed with error: " + err);
asset.isTrash().then((isTrash) => {
console.info('isTrash result: ' + isTrash);
}).catch((error) => {
console.error('isTrash failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1829,11 +1864,12 @@ async function example() {
let getFileCountOneOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [fileType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getFileCountOneOp);
const fetchCount = fetchFileResult.getCount();
console.info('fetchCount result: ' + fetchCount);
fetchFileResult.close();
}
```
......@@ -1860,23 +1896,20 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
const fetchCount = fetchFileResult.getCount();
console.info('mediaLibraryTest : count:' + fetchCount);
console.info('mediaLibrary fetchFileResult.getCount, count:' + fetchCount);
let fileAsset = await fetchFileResult.getFirstObject();
for (var i = 1; i < fetchCount; i++) {
fileAsset = await fetchFileResult.getNextObject();
if(i == fetchCount - 1) {
console.info('mediaLibraryTest : isLast');
var result = fetchFileResult.isAfterLast();
console.info('mediaLibraryTest : isAfterLast:' + result);
console.info('mediaLibraryTest : isAfterLast end');
fetchFileResult.close();
console.info('mediaLibrary fileAsset isAfterLast result: ' + result);
}
}
fetchFileResult.close();
}
```
......@@ -1897,8 +1930,7 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.close();
......@@ -1928,17 +1960,17 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.getFirstObject((err, fileAsset) => {
if (err) {
console.error('Failed ');
fetchFileResult.getFirstObject((error, fileAsset) => {
if (error) {
console.error('fetchFileResult getFirstObject failed with error: ' + error);
return;
}
console.info('fileAsset.displayName : ' + fileAsset.displayName);
console.info('getFirstObject successfully, displayName : ' + fileAsset.displayName);
})
fetchFileResult.close();
}
```
......@@ -1965,15 +1997,15 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.getFirstObject().then(function(fileAsset){
console.info("getFirstObject successfully:"+ JSON.stringify(fileAsset));
}).catch(function(err){
console.error("getFirstObject failed with error: " + err);
fetchFileResult.getFirstObject().then((fileAsset) => {
console.info('getFirstObject successfully, displayName: ' + fileAsset.displayName);
}).catch((error) => {
console.error('getFirstObject failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -1981,7 +2013,9 @@ async function example() {
getNextObject(callback: AsyncCallback&lt;FileAsset&gt;): void
获取文件检索结果中的下一个文件资产。此方法使用callback形式返回结果。
获取文件检索结果中的下一个文件资产，此方法使用callback形式返回结果。
> **说明**： 在使用前需要先使用[getFirstObject](#getfirstobject7)接口获取第一个文件资产，然后使用[isAfterLast](#isafterlast7)确认文件检索集当前不是指向最后一个时方可使用此接口。
**系统能力**：SystemCapability.Multimedia.MediaLibrary.Core
......@@ -2000,18 +2034,22 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.getNextObject((err, fileAsset) => {
if (err) {
console.error('Failed ');
let fileAsset = await fetchFileResult.getFirstObject();
if (！fetchFileResult.isAfterLast) {
fetchFileResult.getNextObject((error, fileAsset) => {
if (error) {
console.error('fetchFileResult getNextObject failed with error: ' + error);
return;
}
console.log('fileAsset.displayName : ' + fileAsset.displayName);
console.log('fetchFileResult getNextObject successfully, displayName: ' + fileAsset.displayName);
})
}
fetchFileResult.close();
}
```
### getNextObject<sup>7+</sup>
......@@ -2020,6 +2058,8 @@ async function example() {
获取文件检索结果中的下一个文件资产。此方法使用promise方式来异步返回FileAsset。
> **说明**： 在使用前需要先使用[getFirstObject](#getfirstobject7)接口获取第一个文件资产，然后使用[isAfterLast](#isafterlast7)确认文件检索集当前不是指向最后一个时方可使用此接口。
**系统能力**：SystemCapability.Multimedia.MediaLibrary.Core
**返回值**：
......@@ -2037,13 +2077,18 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
const fetchCount = fetchFileResult.getCount();
console.info('mediaLibraryTest : count:' + fetchCount);
let fileAsset = await fetchFileResult.getNextObject();
let fileAsset = await fetchFileResult.getFirstObject();
if (！fetchFileResult.isAfterLast) {
fetchFileResult.getNextObject().then((fileAsset) => {
console.info('fetchFileResult getNextObject successfully, displayName: ' + fileAsset.displayName);
}).catch((error) => {
console.error('fetchFileResult getNextObject failed with error: ' + error);
})
}
fetchFileResult.close();
}
```
......@@ -2070,17 +2115,17 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.getLastObject((err, fileAsset) => {
if (err) {
console.error('Failed ');
fetchFileResult.getLastObject((error, fileAsset) => {
if (error) {
console.error('getLastObject failed with error: ' + error);
return;
}
console.info('fileAsset.displayName : ' + fileAsset.displayName);
console.info('getLastObject successfully, displayName: ' + fileAsset.displayName);
})
fetchFileResult.close();
}
```
......@@ -2107,11 +2152,15 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
let lastObject = await fetchFileResult.getLastObject();
fetchFileResult.getLastObject().then((fileAsset) => {
console.info('getLastObject successfully, displayName: ' + fileAsset.displayName);
}).catch((error) => {
console.error('getLastObject failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -2127,7 +2176,7 @@ getPositionObject(index: number, callback: AsyncCallback&lt;FileAsset&gt;): void
| 参数名 | 类型 | 必填 | 说明 |
| -------- | ---------------------------------------- | ---- | ------------------ |
| index | number | 是 | 要获取的文件的索引，从0开始 |
| index | number | 是 | 要获取的文件的索引，从0开始(注意该值要小于文件检索集的count值) |
| callback | AsyncCallback&lt;[FileAsset](#fileasset7)&gt; | 是 | 异步返回FileAsset之后的回调 |
**示例**：
......@@ -2139,17 +2188,17 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.getPositionObject(0, (err, fileAsset) => {
if (err) {
console.error('Failed ');
fetchFileResult.getPositionObject(0, (error, fileAsset) => {
if (error) {
console.error('getPositionObject failed with error: ' + error);
return;
}
console.info('fileAsset.displayName : ' + fileAsset.displayName);
console.info('getPositionObject successfully, displayName: ' + fileAsset.displayName);
})
fetchFileResult.close();
}
```
......@@ -2165,7 +2214,7 @@ getPositionObject(index: number): Promise&lt;FileAsset&gt;
| 参数名 | 类型 | 必填 | 说明 |
| ----- | ------ | ---- | -------------- |
| index | number | 是 | 要获取的文件的索引，从0开始 |
| index | number | 是 | 要获取的文件的索引，从0开始(注意该值要小于文件检索集的count值) |
**返回值**：
......@@ -2182,15 +2231,15 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.getPositionObject(1) .then(function (fileAsset){
console.info('fileAsset.displayName : ' + fileAsset.displayName);
}).catch(function (err) {
console.error("getFileAssets failed with error: " + err);
fetchFileResult.getPositionObject(0).then((fileAsset) => {
console.info('getPositionObject successfully, displayName: ' + fileAsset.displayName);
}).catch((error) => {
console.error('getPositionObject failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -2206,7 +2255,7 @@ getAllObject(callback: AsyncCallback&lt;Array&lt;FileAsset&gt;&gt;): void
| 参数名 | 类型 | 必填 | 说明 |
| -------- | ---------------------------------------- | ---- | -------------------- |
| callback | AsyncCallback<Array<[FileAsset](#fileasset7)>> | 是 | 异步返回FileAsset列表之后的回调 |
| callback | AsyncCallback&lt;Array&lt;[FileAsset](#fileasset7)&gt;&gt; | 是 | 异步返回FileAsset列表之后的回调 |
**示例**：
......@@ -2217,19 +2266,19 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
fetchFileResult.getAllObject((err, fileAsset) => {
if (err) {
console.error('Failed ');
fetchFileResult.getAllObject((error, fileAssetList) => {
if (error) {
console.error('getAllObject failed with error: ' + error);
return;
}
for (let i = 0; i < fetchFileResult.getCount(); i++) {
console.info('fileAsset.displayName : ' + fileAsset[i].displayName);
console.info('getAllObject fileAssetList ' + i + ' displayName: ' + fileAssetList[i].displayName);
}
})
fetchFileResult.close();
}
```
......@@ -2245,7 +2294,7 @@ getAllObject(): Promise&lt;Array&lt;FileAsset&gt;&gt;
| 类型 | 说明 |
| ---------------------------------------- | --------------------- |
| Promise<Array<[FileAsset](#fileasset7)>> | 返回FileAsset对象列表 |
| Promise&lt;Array&lt;[FileAsset](#fileasset7)&gt;&gt; | 返回FileAsset对象列表 |
**示例**：
......@@ -2256,11 +2305,17 @@ async function example() {
let getImageOp = {
selections: fileKeyObj.MEDIA_TYPE + '= ?',
selectionArgs: [imageType.toString()],
order: fileKeyObj.DATE_ADDED + " DESC",
extendArgs: "",
order: fileKeyObj.DATE_ADDED + ' DESC',
};
let fetchFileResult = await media.getFileAssets(getImageOp);
var data = fetchFileResult.getAllObject();
fetchFileResult.getAllObject().then((fileAssetList) => {
for (let i = 0; i < fetchFileResult.getCount(); i++) {
console.info('getAllObject fileAssetList ' + i + ' displayName: ' + fileAssetList[i].displayName);
}
}).catch((error) => {
console.error('getAllObject failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -2309,12 +2364,12 @@ async function example() {
const albumList = await media.getAlbums(AlbumNoArgsfetchOp);
const album = albumList[0];
album.albumName = 'hello';
album.commitModify((err) => {
if (err) {
console.error('Failed ');
album.commitModify((error) => {
if (error) {
console.error('commitModify failed with error: ' + error);
return;
}
console.info('Modify successful.');
console.info('commitModify successful.');
})
}
```
......@@ -2346,10 +2401,10 @@ async function example() {
const albumList = await media.getAlbums(AlbumNoArgsfetchOp);
const album = albumList[0];
album.albumName = 'hello';
album.commitModify().then(function() {
console.info("commitModify successfully");
}).catch(function(err){
console.error("commitModify failed with error: " + err);
album.commitModify().then(() => {
console.info('commitModify successfully');
}).catch((error) => {
console.error('commitModify failed with error: ' + error);
});
}
```
......@@ -2383,12 +2438,19 @@ async function example() {
selections: '',
selectionArgs: [],
}
// 获取符合检索要求的相册，返回相册列表
const albumList = await media.getAlbums(AlbumNoArgsfetchOp);
const album = albumList[0];
album.getFileAssets(fileNoArgsfetchOp, getFileAssetsCallBack);
function getFileAssetsCallBack(err, fetchFileResult) {
// do something
// 取到相册列表中的一个相册，获取此相册中所有符合媒体检索选项的媒体资源
album.getFileAssets(fileNoArgsfetchOp, (error, fetchFileResult) => {
if (error) {
console.error('album getFileAssets failed with error: ' + error);
return;
}
let count = fetchFileResult.getcount();
console.info('album getFileAssets successfully, count: ' + count);
});
fetchFileResult.close();
}
```
......@@ -2426,13 +2488,17 @@ async function example() {
selections: '',
selectionArgs: [],
};
// 获取符合检索要求的相册，返回相册列表
const albumList = await media.getAlbums(AlbumNoArgsfetchOp);
const album = albumList[0];
album.getFileAssets(fileNoArgsfetchOp).then(function(albumFetchFileResult){
console.info("getFileAssets successfully: " + JSON.stringify(albumFetchFileResult));
}).catch(function(err){
console.error("getFileAssets failed with error: " + err);
// 取到相册列表中的一个相册，获取此相册中所有符合媒体检索选项的媒体资源
album.getFileAssets(fileNoArgsfetchOp).then((albumFetchFileResult) => {
let count = fetchFileResult.getcount();
console.info('album getFileAssets successfully, count: ' + count);
}).catch((error) => {
console.error('album getFileAssets failed with error: ' + error);
});
fetchFileResult.close();
}
```
......@@ -2470,32 +2536,32 @@ async function example() {
枚举，文件关键信息。
> ![icon-note.gif](public_sys-resources/icon-note.gif) **说明：**
> **说明：**
> bucket_id字段在文件重命名或移动后可能会发生变化，开发者使用前需要重新获取。
**系统能力：** 以下各项对应的系统能力均为SystemCapability.Multimedia.MediaLibrary.Core
| 名称 | 值 | 说明 |
| ------------- | ------------------- | ---------------------------------------------------------- |
| ID | "file_id" | 文件编号 |
| RELATIVE_PATH | "relative_path" | 相对公共目录路径 |
| DISPLAY_NAME | "display_name" | 显示名字 |
| PARENT | "parent" | 父目录id |
| MIME_TYPE | "mime_type" | 文件扩展属性 |
| MEDIA_TYPE | "media_type" | 媒体类型 |
| SIZE | "size" | 文件大小（单位：字节） |
| DATE_ADDED | "date_added" | 添加日期（添加文件时间到1970年1月1日的秒数值） |
| DATE_MODIFIED | "date_modified" | 修改日期（修改文件时间到1970年1月1日的秒数值，修改文件名不会改变此值，当文件内容发生修改时才会更新） |
| DATE_TAKEN | "date_taken" | 拍摄日期（文件拍照时间到1970年1月1日的秒数值） |
| TITLE | "title" | 文件标题 |
| ARTIST | "artist" | 作者 |
| AUDIOALBUM | "audio_album" | 专辑 |
| DURATION | "duration" | 持续时间（单位：毫秒） |
| WIDTH | "width" | 图片宽度（单位：像素） |
| HEIGHT | "height" | 图片高度（单位：像素） |
| ORIENTATION | "orientation" | 图片显示方向，即顺时针旋转角度，如0，90，180。（单位：度） |
| ALBUM_ID | "bucket_id" | 文件所归属的相册编号 |
| ALBUM_NAME | "bucket_display_name" | 文件所归属相册名称 |
| ID | 'file_id' | 文件编号 |
| RELATIVE_PATH | 'relative_path' | 相对公共目录路径 |
| DISPLAY_NAME | 'display_name' | 显示名字 |
| PARENT | 'parent' | 父目录id |
| MIME_TYPE | 'mime_type' | 文件扩展属性(如：image/*、video/*、file/*) |
| MEDIA_TYPE | 'media_type' | 媒体类型 |
| SIZE | 'size' | 文件大小（单位：字节） |
| DATE_ADDED | 'date_added' | 添加日期（添加文件时间到1970年1月1日的秒数值） |
| DATE_MODIFIED | 'date_modified' | 修改日期（修改文件时间到1970年1月1日的秒数值，修改文件名不会改变此值，当文件内容发生修改时才会更新） |
| DATE_TAKEN | 'date_taken' | 拍摄日期（文件拍照时间到1970年1月1日的秒数值） |
| TITLE | 'title' | 文件标题 |
| ARTIST | 'artist' | 作者 |
| AUDIOALBUM | 'audio_album' | 专辑 |
| DURATION | 'duration' | 持续时间（单位：毫秒） |
| WIDTH | 'width' | 图片宽度（单位：像素） |
| HEIGHT | 'height' | 图片高度（单位：像素） |
| ORIENTATION | 'orientation' | 图片显示方向，即顺时针旋转角度，如0，90，180。（单位：度） |
| ALBUM_ID | 'bucket_id' | 文件所归属的相册编号 |
| ALBUM_NAME | 'bucket_display_name' | 文件所归属相册名称 |
## DirectoryType<sup>8+</sup>
......@@ -2538,9 +2604,9 @@ async function example() {
| 名称 | 类型 | 可读 | 可写 | 说明 |
| ----------------------- | ------------------- | ---- | ---- | ------------------------------------------------------------ |
| selections | string | 是 | 是 | 检索条件，使用[FileKey](#filekey8)中的枚举值作为检索条件的列名。示例：<br/>selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR ' +mediaLibrary.FileKey.MEDIA_TYPE + '= ?', |
| selections | string | 是 | 是 | 检索条件，使用[FileKey](#filekey8)中的枚举值作为检索条件的列名。示例：<br/>selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR ' + mediaLibrary.FileKey.MEDIA_TYPE + '= ?', |
| selectionArgs | Array&lt;string&gt; | 是 | 是 | 检索条件的值，对应selections中检索条件列的值。<br/>示例：<br/>selectionArgs: [mediaLibrary.MediaType.IMAGE.toString(), mediaLibrary.MediaType.VIDEO.toString()], |
| order | string | 是 | 是 | 检索结果排序方式，使用[FileKey](#filekey8)中的枚举值作为检索结果排序的列，可以用升序或降序排列。示例：<br/>升序排列：order: mediaLibrary.FileKey.DATE_ADDED + " ASC"<br/>降序排列：order: mediaLibrary.FileKey.DATE_ADDED + " DESC" |
| order | string | 是 | 是 | 检索结果排序方式，使用[FileKey](#filekey8)中的枚举值作为检索结果排序的列，可以用升序或降序排列。示例：<br/>升序排列：order: mediaLibrary.FileKey.DATE_ADDED + ' ASC'<br/>降序排列：order: mediaLibrary.FileKey.DATE_ADDED + ' DESC' |
| uri<sup>8+</sup> | string | 是 | 是 | 文件URI |
| networkId<sup>8+</sup> | string | 是 | 是 | 注册设备网络ID |
| extendArgs<sup>8+</sup> | string | 是 | 是 | 扩展的检索参数，目前没有扩展检索参数 |
......@@ -2584,4 +2650,3 @@ async function example() {
| type | 'image' &#124; 'video' &#124; 'media' | 是 | 是 | 媒体类型，包括：image, video, media，当前仅支持media类型 |
| count | number | 是 | 是 | 媒体选择，count = 1表示单选，count大于1表示多选。 |
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