HarmonyOS 鸿蒙Next相机相册选图demo，支持打开相册并调用相机拍照

demo如下：

import { BusinessError } from '@ohos.base';
import picker from '@ohos.file.picker';

@Entry
@Component
struct Index {
@State message: string = 'Hello World';
@State photoUri: string = '';

async example01() {
try {
let photoSelectOptions = new picker.PhotoSelectOptions();
photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
photoSelectOptions.maxSelectNumber = 5;
let photoPicker = new picker.PhotoViewPicker();
photoPicker.select(photoSelectOptions).then((photoSelectResult: picker.PhotoSelectResult) => {
console.info('PhotoViewPicker.select successfully, photoSelectResult uri: ' + JSON.stringify(photoSelectResult));
this.photoUri = photoSelectResult.photoUris[0];
}).catch((err: BusinessError) => {
console.error('PhotoViewPicker.select failed with err: ' + JSON.stringify(err));
});
} catch (error) {
let err: BusinessError = error as BusinessError;
console.error('PhotoViewPicker failed with err: ' + JSON.stringify(err));
}
}

build() {
RelativeContainer() {
Text(this.message)
.id('HelloWorld')
.fontSize(50)
.fontWeight(FontWeight.Bold)
.alignRules({
center: { anchor: '__container__', align: VerticalAlign.Center },
middle: { anchor: '__container__', align: HorizontalAlign.Center }
})
.onClick(() => {
this.example01()
})
Row() {
Image(`${this.photoUri}`)
}
.height(300)
.width(300)
}
.height('100%')
.width('100%')
}
}