复制import mediaLibrary from @ohos.multimedia.mediaLibrary;
import hilog from @ohos.hilog;
const TAG = mediaLibrary.ts
// 媒体的基本关键信息
export type MediaDataType = {
uri: string, // 路径
name: string, // 资源名称
mimeType: string, // 资源类型
relativePath: string, // 相对路径(所属公共目录)
size: number, // 资源大小
pixelmap?: any // 资源缩略图
}
export class mediaManager {
private media: mediaLibrary.MediaLibrary = null // 媒体库
private fetchFileResult: mediaLibrary.FetchFileResult = null // 当前媒体结果集
private curFileAsset = null // 当前媒体结果
private curSelectedMediaUrls: Array<string> = null // 当前选择媒体的urls
// 首先获取媒体库实例
setMediaLibrary(): Promise<void> {
return new Promise((res, rej) => {
this.media = mediaLibrary.getMediaLibrary();
if (!this.media) {
hilog.info(0x0001, TAG, create mediaLibrary fail)
rej()
}
res()
})
}
// 获取IMAGE类型媒体库
async getImageAssetSync(): Promise<any> {
return await this.getAssets(mediaLibrary.MediaType.IMAGE)
}
// 获取VIDEO类型媒体库
async getVideoAssetSync(): Promise<any> {
return await this.getAssets(mediaLibrary.MediaType.VIDEO)
}
// 获取FILE类型媒体库
async getFileAssetSync(): Promise<any> {
return await this.getAssets(mediaLibrary.MediaType.FILE)
}
async getAssets(MediaType: mediaLibrary.MediaType): Promise<any> {
if (!this.media) await this.setMediaLibrary()
return new Promise((res) => {
//--- FileKey:文件关键信息,这里根据MEDIA_TYPE选择媒体
let fileKeyObj = mediaLibrary.FileKey.MEDIA_TYPE
let imagesfetchOp = { //--- select选项配置
selections: fileKeyObj + = ?,
selectionArgs: [MediaType.toString()],
}
this.media.getFileAssets(imagesfetchOp).then((fetchFileResult) => {
this.fetchFileResult = fetchFileResult
hilog.info(0x0001, TAG, "getFileAssets success:" + fetchFileResult.getCount()+ selected)
res(fetchFileResult.getCount())
}).catch((err) => {
hilog.info(0x0001, TAG, "getFileAssets failed:" + err)
})
})
}
// 释放结果集资源
releaseFetchFileResult(): void {
// Bug:真机测试时,此方法(删除FetchFileResult实例)会导致手机内媒体资源显示刷新
//this.fetchFileResult.close();
}
// 释放媒体库资源
release() {
this.media.release()
}
// 从结果集中获取指定index的媒体
async getCertainImageMedia(index: number): Promise<MediaDataType> {
if (!this.fetchFileResult) await this.getImageAssetSync()
return new Promise((res) => {
this.fetchFileResult.getPositionObject(index).then(async (fileAsset) => {
hilog.info(0x0001, TAG, "getPositionObject successfully:" + JSON.stringify(fileAsset))
res(await this.handle(fileAsset))
}).catch((err) => {
hilog.info(0x0001, TAG, "getPositionObject failed:" + err);
})
})
}
// 从结果集中获取下一个的媒体
async getNextImageMedia(): Promise<MediaDataType> {
if (!this.fetchFileResult) await this.getImageAssetSync()
return new Promise((res, rej) => {
this.fetchFileResult.getNextObject().then(async (fileAsset) => {
hilog.info(0x0001, TAG, "getNextObject success:" + JSON.stringify(fileAsset));
res(await this.handle(fileAsset))
}).catch((err) => {
hilog.info(0x0001, TAG, "getNextObject failed:" + err);
})
})
}
// 媒体结果处理,返回数据
private handle(fileAsset: mediaLibrary.FileAsset): Promise<MediaDataType> {
return new Promise(res => {
fileAsset.getThumbnail((err, pixelmap) => {
let data: MediaDataType = {
uri: fileAsset.uri,
name: fileAsset.displayName,
mimeType: fileAsset.mimeType,
relativePath: fileAsset.relativePath,
size: fileAsset.size
}
if (!err) {
hilog.info(0x0001, TAG, mediaLibraryTest : getThumbnail Successful + pixelmap)
data.pixelmap = pixelmap
}
this.curFileAsset = data
res(data)
})
})
}
// 拉起相册选择
async startGetMediaSelect(selectedNumber: number): Promise<Array<string>> {
if (!this.media) await this.setMediaLibrary()
return new Promise((res, rej) => {
let option: mediaLibrary.MediaSelectOption = {
type: "media", //--- 截止目前只支持选择media,即所有类型的资源
count: selectedNumber // --- 需要选择的媒体个数
};
this.media.startMediaSelect(option, (err, value: Array<string>) => {
//--- 这里回调参数注意要使用"value"命名,否则不生效!
if (err) {
hilog.info(0x0001, TAG, "selecting media err:" + JSON.stringify(err));
rej(err)
}
hilog.info(0x0001, TAG, "Media resources selected: " + value.length);
this.curSelectedMediaUrls = value
res(this.curSelectedMediaUrls)
})
})
}
// 从index位置开始,拉起相册预览结果集中的媒体
startImagePreview(index?: number): Promise<void> {
return this.media.startImagePreview(this.curSelectedMediaUrls, index || 0)
}
getCurSelectedMediaUrls(): Array<string> {
return this.curSelectedMediaUrls
}
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