开源 Arkts 鸿蒙应用开发（八）多媒体--相册和相机

文章的目的为了记录使用Arkts 进行Harmony app 开发学习的经历。本职为嵌入式软件开发，公司安排开发app，临时学习，完成app的开发。开发流程和要点有些记忆模糊，赶紧记录，防止忘记。

相关链接：

开源 Arkts 鸿蒙应用开发（一）工程文件分析-CSDN博客

开源 Arkts 鸿蒙应用开发（二）封装库.har制作和应用-CSDN博客

开源 Arkts 鸿蒙应用开发（三）Arkts的介绍-CSDN博客

开源 Arkts 鸿蒙应用开发（四）布局和常用控件-CSDN博客

开源 Arkts 鸿蒙应用开发（五）控件组成和复杂控件-CSDN博客

开源 Arkts 鸿蒙应用开发（六）数据持久--文件和首选项存储-CSDN博客

开源 Arkts 鸿蒙应用开发（七）数据持久--sqlite关系数据库-CSDN博客

开源 Arkts 鸿蒙应用开发（八）多媒体--相册和相机-CSDN博客

开源 Arkts 鸿蒙应用开发（九）通讯--tcp客户端-CSDN博客

开源 Arkts 鸿蒙应用开发（十）通讯--Http数据传输-CSDN博客

推荐链接：

开源 java android app 开发（一）开发环境的搭建-CSDN博客

开源 java android app 开发（二）工程文件结构-CSDN博客

开源 java android app 开发（三）GUI界面布局和常用组件-CSDN博客

开源 java android app 开发（四）GUI界面重要组件-CSDN博客

开源 java android app 开发（五）文件和数据库存储-CSDN博客

开源 java android app 开发（六）多媒体使用-CSDN博客

开源 java android app 开发（七）通讯之Tcp和Http-CSDN博客

开源 java android app 开发（八）通讯之Mqtt和Ble-CSDN博客

开源 java android app 开发（九）后台之线程和服务-CSDN博客

开源 java android app 开发（十）广播机制-CSDN博客

开源 java android app 开发（十一）调试、发布-CSDN博客

开源 java android app 开发（十二）封库.aar-CSDN博客

推荐链接：

开源C# .net mvc 开发（一）WEB搭建_c#部署web程序-CSDN博客

开源 C# .net mvc 开发（二）网站快速搭建_c#网站开发-CSDN博客

开源 C# .net mvc 开发（三）WEB内外网访问(VS发布、IIS配置网站、花生壳外网穿刺访问)_c# mvc 域名下不可訪問內網,內網下可以訪問域名-CSDN博客

开源 C# .net mvc 开发（四）工程结构、页面提交以及显示_c#工程结构-CSDN博客

开源 C# .net mvc 开发（五）常用代码快速开发_c# mvc开发-CSDN博客

本章内容主要是鸿蒙的多媒体使用，主要功能包括从相册选择图片、拍摄照片以及将图片保存到应用沙箱目录。

1.使用流程

2.相册和相机的使用

3.保存到沙箱

4.所有代码

5.显示效果

一、使用流程图

二、相册和相机的使用

2.1 使用PhotoViewPicker选择图片

         Button("打开相册照片").width('100%').height(40).onClick(async () => {try {let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;PhotoSelectOptions.maxSelectNumber = 1;let photoPicker = new photoAccessHelper.PhotoViewPicker();photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: photoAccessHelper.PhotoSelectResult) => {this.imageUri = PhotoSelectResult.photoUris[0] ? PhotoSelectResult.photoUris[0] : this.imageUri;hilog.info(0x0000, TAG, 'PhotoViewPicker.select succeed, uri: ' + JSON.stringify(PhotoSelectResult));}).catch((err: BusinessError) => {hilog.error(0x0000, TAG, `PhotoViewPicker.select failed, error: ${err.code}, ${err.message}`);});} catch (error) {let err: BusinessError = error as BusinessError;hilog.error(0x0000, TAG, `PhotoViewPicker failed, error: ${err.code}, ${err.message}`);}this.isShowGet = false;})

2.2 用cameraPicker调用设备相机

          Button("相机拍摄照片").width('100%').height(40).onClick(async () => {// [Start pick_file]try {let pickerProfile: cameraPicker.PickerProfile ={ cameraPosition: camera.CameraPosition.CAMERA_POSITION_BACK };//Select the action of pulling up the camera to take pictures.let pickerResult: cameraPicker.PickerResult = await cameraPicker.pick(this.getUIContext().getHostContext(),[cameraPicker.PickerMediaType.PHOTO], pickerProfile);//Return the photo uri to the application.this.imageUri = pickerResult.resultUri ? pickerResult.resultUri : this.imageUri;hilog.info(0x0000, TAG, 'cameraPicker.pick succeed, uri: ' + JSON.stringify(pickerResult));} catch (error) {let err = error as BusinessError;hilog.error(0x0000, TAG, `cameraPicker.pick failed, error: ${err.code}, ${err.message}`);}// [End pick_file]this.isShowGet = false;})

三、保存到沙箱，特别的是大量使用async/await处理异步操作

 async saveImageToSandbox() {// 1. 检查图片URIif (!this.imageUri) {this.getUIContext().getPromptAction().showToast({message: $r('app.string.no_image_alert'),duration: 2000});return;}try {// 2. 等待图片复制到沙箱await copyImg2Sandbox(this.imageUri, this.path);// 3. 创建ImageSourcethis.imageSource = image.createImageSource(this.path);// 4. 并行获取图片信息await Promise.all([new Promise<void>((resolve, reject) => {this.imageSource!.getImageInfo((error, info) => {error ? reject(error) : resolve();});}),this.imageSource.getImageProperties([image.PropertyKey.IMAGE_WIDTH,image.PropertyKey.IMAGE_LENGTH,image.PropertyKey.F_NUMBER])]);// 5. 创建PixelMap（确保这一步成功）this.pixelMap = await this.imageSource.createPixelMap();if (!this.pixelMap) {throw new Error('Failed to create PixelMap');}// 6. 保存到文件await pixelMap2File(this.pixelMap, this.path);this.getUIContext().getPromptAction().showToast({message: $r('app.string.save_in_sandbox_success'),duration: 2000});this.isShowSave = false;} catch (error) {this.handleSaveError(error as BusinessError);}}

四、所有代码，新建工程后，只修改Index.ets就可以

Index.ets代码

import { image } from '@kit.ImageKit';
import { PhotoPickerComponent, PickerController, photoAccessHelper, ReminderMode } from '@kit.MediaLibraryKit';
import { cameraPicker, camera } from '@kit.CameraKit';
import { picker } from '@kit.CoreFileKit';
import { promptAction } from '@kit.ArkUI';
import { BusinessError } from '@kit.BasicServicesKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { copyImg2Sandbox, pixelMap2File } from '../common/utils/Utils';const TAG = 'IMAGE_APP';@Entry
@Component
struct Index {@State path: string = this.getUIContext().getHostContext()!.filesDir + '/image.jpg';@State pixelMapPath: string = this.getUIContext().getHostContext()!.filesDir + '/pixelMap.jpg';@State imageUri: string | undefined = undefined;@State imageSource: image.ImageSource | undefined = undefined;@State pixelMap: image.PixelMap | undefined = undefined;@State isShowGet: boolean = false;@State isShowPicker: boolean = false;@State isShowSave: boolean = false;@State pickerController: PickerController = new PickerController();async saveImageToSandbox() {// 1. 检查图片URIif (!this.imageUri) {this.getUIContext().getPromptAction().showToast({message: $r('app.string.no_image_alert'),duration: 2000});return;}try {// 2. 等待图片复制到沙箱await copyImg2Sandbox(this.imageUri, this.path);// 3. 创建ImageSourcethis.imageSource = image.createImageSource(this.path);// 4. 并行获取图片信息await Promise.all([new Promise<void>((resolve, reject) => {this.imageSource!.getImageInfo((error, info) => {error ? reject(error) : resolve();});}),this.imageSource.getImageProperties([image.PropertyKey.IMAGE_WIDTH,image.PropertyKey.IMAGE_LENGTH,image.PropertyKey.F_NUMBER])]);// 5. 创建PixelMap（确保这一步成功）this.pixelMap = await this.imageSource.createPixelMap();if (!this.pixelMap) {throw new Error('Failed to create PixelMap');}// 6. 保存到文件await pixelMap2File(this.pixelMap, this.path);this.getUIContext().getPromptAction().showToast({message: $r('app.string.save_in_sandbox_success'),duration: 2000});this.isShowSave = false;} catch (error) {this.handleSaveError(error as BusinessError);}}// 错误处理方法private handleSaveError(error: BusinessError) {hilog.error(0x0000, TAG, `保存失败: ${error.code}, ${error.message}`);let message = "save_failed";if (error.message.includes('createPixelMap')) {message = "pixelmap_creation_failed";} else if (error.message.includes('copyImg2Sandbox')) {message = "copy_failed";}this.getUIContext().getPromptAction().showToast({message,duration: 2000});}build() {Navigation() {Column() {Image(this.imageUri).height(400).margin({ top: 16 })Column({ space: 12 }) {Button("打开相册照片").width('100%').height(40).onClick(async () => {try {let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;PhotoSelectOptions.maxSelectNumber = 1;let photoPicker = new photoAccessHelper.PhotoViewPicker();photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: photoAccessHelper.PhotoSelectResult) => {this.imageUri = PhotoSelectResult.photoUris[0] ? PhotoSelectResult.photoUris[0] : this.imageUri;hilog.info(0x0000, TAG, 'PhotoViewPicker.select succeed, uri: ' + JSON.stringify(PhotoSelectResult));}).catch((err: BusinessError) => {hilog.error(0x0000, TAG, `PhotoViewPicker.select failed, error: ${err.code}, ${err.message}`);});} catch (error) {let err: BusinessError = error as BusinessError;hilog.error(0x0000, TAG, `PhotoViewPicker failed, error: ${err.code}, ${err.message}`);}this.isShowGet = false;})Button("相机拍摄照片").width('100%').height(40).onClick(async () => {// [Start pick_file]try {let pickerProfile: cameraPicker.PickerProfile ={ cameraPosition: camera.CameraPosition.CAMERA_POSITION_BACK };//Select the action of pulling up the camera to take pictures.let pickerResult: cameraPicker.PickerResult = await cameraPicker.pick(this.getUIContext().getHostContext(),[cameraPicker.PickerMediaType.PHOTO], pickerProfile);//Return the photo uri to the application.this.imageUri = pickerResult.resultUri ? pickerResult.resultUri : this.imageUri;hilog.info(0x0000, TAG, 'cameraPicker.pick succeed, uri: ' + JSON.stringify(pickerResult));} catch (error) {let err = error as BusinessError;hilog.error(0x0000, TAG, `cameraPicker.pick failed, error: ${err.code}, ${err.message}`);}// [End pick_file]this.isShowGet = false;})Button("保存照片到APP目录").width('100%').height(40).onClick(async () => {this.saveImageToSandbox();})}.width('100%').height(150).padding({ left: 16, right: 16 }).margin({ bottom: 16 }).justifyContent(FlexAlign.SpaceBetween)}.width('100%').height('100%').justifyContent(FlexAlign.SpaceBetween)}.width('100%').height('100%').title($r('app.string.title'))}
}

五、显示效果

5.1 app图片和打开相册后图片