餐饮网站建设的模板,手机手机网站开发,wordpress 页面转跳,湖州市吴兴区建设局网站鸿蒙开发过程中#xff0c;经常会进行系统调用#xff0c;拍照、拍视频、选择图库图片、选择图库视频、选择文件。今天就给大家分享一个工具类。
1.话不多说#xff0c;先展示样式 2.设计思路
根据官方提供的指南开发工具类#xff0c;基础的拍照、拍视频、图库选照片、选…鸿蒙开发过程中经常会进行系统调用拍照、拍视频、选择图库图片、选择图库视频、选择文件。今天就给大家分享一个工具类。
1.话不多说先展示样式 2.设计思路
根据官方提供的指南开发工具类基础的拍照、拍视频、图库选照片、选文件不过多缀述图库选择这里设计成集合形式可返回图片和视频视频展示时不显示内容所以在工具类多加了一个获取视频缩略图的功能。
3.具体代码
import common from ohos.app.ability.common;
import picker from ohos.file.picker;
import mediaLibrary from ohos.multimedia.mediaLibrary;
import wantConstant from ohos.ability.wantConstant;
import { MediaBean } from ../bean/MediaBean;
import { StringUtils } from ../utils/StringUtils;/*** description 多媒体辅助类* author Gwei* time 2024/3/1 15:57*/
export class MediaHelper {private readonly TAG: string MediaHelper;private mContext: common.Context;constructor(context: common.Context) {this.mContext context;}/*** 图库选择,返回最大数量为9的图片、视频集合*/public selectPicture(count:number): PromiseArrayMediaBean {let imgList:Arraystring [];let mediaList:ArrayMediaBean [];try {let photoSelectOptions new picker.PhotoSelectOptions();photoSelectOptions.MIMEType picker.PhotoViewMIMETypes.IMAGE_TYPE;photoSelectOptions.maxSelectNumber 9-count;let photoPicker new picker.PhotoViewPicker();return photoPicker.select(photoSelectOptions).then((photoSelectResult) {//Log.info(this.TAG, PhotoViewPicker.select successfully, PhotoSelectResult uri: JSON.stringify(photoSelectResult));if (photoSelectResult photoSelectResult.photoUris photoSelectResult.photoUris.length 0) {for (let i 0; i photoSelectResult.photoUris.length; i) {imgList.push(photoSelectResult.photoUris[i]);}//Log.info(this.TAG, PhotoViewPicker.select successfully, PhotoSelectResult uri: filePath);return imgList;}}).catch((err) {//Log.error(this.TAG, PhotoViewPicker.select failed with err: err);return err;}).then(async (imgList) {for (let index 0; index imgList.length; index) {const mediaBean await this.buildMediaBean(imgList[index]);mediaList.push(mediaBean);}return mediaList;});} catch (err) {//Log.error(this.TAG, PhotoViewPicker failed with err: err);return Promise.reject(err);}}/*** 选择文件*/public selectFile(): PromiseMediaBean {try {let documentSelectOptions new picker.DocumentSelectOptions();let documentPicker new picker.DocumentViewPicker();return documentPicker.select(documentSelectOptions).then((documentSelectResult) {//Log.info(this.TAG, DocumentViewPicker.select successfully, DocumentSelectResult uri: JSON.stringify(documentSelectResult));if (documentSelectResult documentSelectResult.length 0) {let filePath documentSelectResult[0];//Log.info(this.TAG, DocumentViewPicker.select successfully, DocumentSelectResult uri: filePath);return filePath;}}).catch((err) {//Log.error(this.TAG, PhotoViewPicker.select failed with err: err);return err;}).then(async (filePath) {const mediaBean await this.buildMediaBean(filePath);return mediaBean;});} catch (err) {//Log.error(this.TAG, PhotoViewPicker failed with err: err);return Promise.reject(err);}}/*** 拍照*/public async takePhoto(context: common.UIAbilityContext): PromiseMediaBean {let want {uri: ,action: wantConstant.Action.ACTION_IMAGE_CAPTURE,parameters: {},};return context.startAbilityForResult(want).then((result) {//Log.info(this.TAG, startAbility call back , ${JSON.stringify(result)});if (result.resultCode 0 result.want StringUtils.isNotNullOrEmpty(result.want.uri)) {//拍照成功//Log.info(this.TAG, takePhoto successfully, takePhotoResult uri: result.want.uri);return result.want.uri;}}).catch((error) {//Log.info(this.TAG, startAbility error , ${JSON.stringify(error)});return error;}).then(async (uri: string) {const mediaBean await this.buildMediaBean(uri);return mediaBean;});}/*** 拍视频*/public async takeVideo(context: common.UIAbilityContext): PromiseMediaBean {let want {uri: ,action: wantConstant.Action.ACTION_VIDEO_CAPTURE,parameters: {},};return context.startAbilityForResult(want).then((result) {//Log.info(this.TAG, startAbility call back , ${JSON.stringify(result)});if (result.resultCode 0 result.want StringUtils.isNotNullOrEmpty(result.want.uri)) {//拍照成功//Log.info(this.TAG, takePhoto successfully, takePhotoResult uri: result.want.uri);return result.want.uri;}}).catch((error) {//Log.info(this.TAG, startAbility error , ${JSON.stringify(error)});return error;}).then(async (uri: string) {const mediaBean await this.buildMediaBean(uri);return mediaBean;});}/*** 封装多媒体实体类** param uri 文件路径*/private async buildMediaBean(uri: string): PromiseMediaBean {if (StringUtils.isNullOrEmpty(uri)) {return null;}const mediaBean: MediaBean new MediaBean();mediaBean.localUrl uri;await this.appendFileInfoToMediaBean(mediaBean, uri);return mediaBean;}/*** 通过Uri查找所选文件信息插入到MediaBean中* param mediaBean* param uri*/private async appendFileInfoToMediaBean(mediaBean: MediaBean, uri: string):PromiseMediaBean {if (StringUtils.isNullOrEmpty(uri)) {return;}let fileList: ArraymediaLibrary.FileAsset [];const parts: string[] uri.split(/);const id: string parts.length 0 ? parts[parts.length - 1] : -1;try {let media mediaLibrary.getMediaLibrary(this.mContext);let mediaFetchOptions: mediaLibrary.MediaFetchOptions {selections: mediaLibrary.FileKey.ID ?,selectionArgs: [id],uri: uri};let fetchFileResult await media.getFileAssets(mediaFetchOptions);//Log.info(this.TAG, fileList getFileAssetsFromType fetchFileResult.count ${fetchFileResult.getCount()});fileList await fetchFileResult.getAllObject();fetchFileResult.close();await media.release();} catch (e) {//Log.error(this.TAG, query: file data exception );}if (fileList fileList.length 0) {let fileInfoObj fileList[0];//Log.info(this.TAG, file id ${JSON.stringify(fileInfoObj.id)} , uri ${JSON.stringify(fileInfoObj.uri)});//Log.info(this.TAG, file fileList displayName ${fileInfoObj.displayName} ,size ${fileInfoObj.size} ,mimeType ${fileInfoObj.mimeType});mediaBean.fileName fileInfoObj.displayName;mediaBean.fileSize fileInfoObj.size;mediaBean.fileType fileInfoObj.mimeType;mediaBean.pixelmap await this.getPixelmap(fileInfoObj)}}/*** description 获取缩略图* author Gwei* time 2024/3/1 15:57*/getPixelmap(fileInfoObj) {return new Promise(function (resolve, reject) {fileInfoObj.getThumbnail((err, pixelmap) {if (!err) {resolve(pixelmap)}else{resolve();}})})}
}
4.使用方法
async handleClick(option: MediaOption) {let mediaBean: MediaBean;switch (option) {case MediaOption.TakePhoto:mediaBean await this.mediaHelper.takePhoto(getContext() as common.UIAbilityContext);this.imgList.push(mediaBean)break;case MediaOption.TakeVideo:mediaBean await this.mediaHelper.takeVideo(getContext() as common.UIAbilityContext);this.imgList.push(mediaBean)break;case MediaOption.Picture:let list: ArrayMediaBean [];list await this.mediaHelper.selectPicture(this.imgList.length);for (let i 0; i list.length; i) {this.imgList.push(list[i])}break;case MediaOption.File:mediaBean await this.mediaHelper.selectFile();this.audioList.push(mediaBean);break;default:break;}
}工具类已经提供给大家了喜欢的可以点赞收藏
