HarmonyOS 鸿蒙Next使用相机服务预览时，前置摄像头清晰后置模糊如何解决

参考：

import camera from '@ohos.multimedia.camera';
import { BusinessError } from '@ohos.base';
import image from '@ohos.multimedia.image';
import abilityAccessCtrl, { PermissionRequestResult, Permissions } from '@ohos.abilityAccessCtrl';
import bundleManager from '@ohos.bundle.bundleManager';
import { GlobalContext } from '../utils/GlobalContext';
import Logger from '../utils/Logger';
import common from '@ohos.app.ability.common';

let context = getContext() as common.UIAbilityContext;

let TAG: string = "Index";
let camerasession: camera.CaptureSession
let cameraInput: camera.CameraInput
let photoOutPut: camera.PhotoOutput
let previewOutput: camera.PreviewOutput;
let previewOutput2: camera.PreviewOutput;
let captureSession: camera.CaptureSession;
let cameraWidth = 1920;
let cameraHeight = 1080;

let pixma: PixelMap|undefined = undefined;

@Component
@Entry
struct XComponentPage {
mXComponentController: XComponentController = new XComponentController;
surfaceId: string = '';
@State pixma: PixelMap|undefined = undefined
@State ca :Number = 0
private receiver: image.ImageReceiver = this.createImageReceiver();

async aboutToAppear() {
await grantPermission().then(res => {
console.info(TAG, `权限申请成功 ${JSON.stringify(res)}`);
if (res) {
//预览和拍照
createPhotoAndPreview(this.surfaceId, this.receiver,this.ca);
}
})
}

build() {
Column () {
// 创建XComponent
XComponent({
id: '',
type: 'surface',
libraryname: '',
controller: this.mXComponentController
})
.onLoad(async () => {
// 设置Surface宽高（1920*1080），预览尺寸设置参考前面 previewProfilesArray 获取的当前设备所支持的预览分辨率大小去设置
// 预览流与录像输出流的分辨率的宽高比要保持一致
// this.mXComponentController.setXComponentSurfaceSize({ surfaceWidth: cameraWidth, surfaceHeight: cameraHeight });
// 获取Surface ID
this.surfaceId = this.mXComponentController.getXComponentSurfaceId();
})
.width('1080px')
.height('1920px')
Button () {
Text("拍照")
.fontColor(Color.Black)
.alignSelf(ItemAlign.Center)
.onClick(() => {
let settings: camera.PhotoCaptureSetting = {
quality: camera.QualityLevel.QUALITY_LEVEL_HIGH, // 设置图片质量高
rotation: camera.ImageRotation.ROTATION_0, // 设置图片旋转角度0
mirror: false // 设置镜像使能开关(默认关)
};
photoOutPut.capture(settings, (err: BusinessError) => {
if (err) {
console.error(`Failed to capture the photo. error: ${JSON.stringify(err)}`);
return;
}
console.info('Callback invoked to indicate the photo capture request success.');
});
})
}
.width(100)
.height(100)
Button('摄像头_front')
.size({ width: 150, height: 34 })
.margin({ left: 10 })
.onClick(() => {

this.ca=1
removeSession(captureSession,cameraInput, previewOutput, photoOutPut)
createPhotoAndPreview(this.surfaceId, this.receiver,this.ca)
// this.cameraController.setDevicePosition(DevicePosition.front);
})
Button('摄像头_back')
.size({ width: 150, height: 34 })
.margin({ left: 10 })
.onClick(() => {
this.ca=0
removeSession(captureSession,cameraInput, previewOutput, photoOutPut)
createPhotoAndPreview(this.surfaceId, this.receiver,this.ca)
// this.cameraController.setDevicePosition(DevicePosition.back);
})
}
}