一.背景
目前需要实现活体检测功能，而且是需要静默活体，但是现在官方的活体API还不支持静默，第三方的SDK也不支持，现在自定义一个类似活体检测的功能，但是不会去检测是否活体，拿到照片以后去调用人脸识别
二.实现思路
先调用相机，将相机设置为前置摄像头，将当前相机内容使用XComponent实时渲染，启用定时拍照功能，设置定时器，时间到以后利用截图组件功能去做，然后拿到图片地址去进行人脸识别，不保存到本地
三.代码
这边只放了首页代码，其余代码会在包里，在文章后附带
使用的时候将包放到项目中，直接跳转或者引用xsComponent这个页面
/* * Copyright (c) 2025 Huawei Device Co., Ltd. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ import { CameraConstants } from './constants/CameraConstants'; import { CameraUtils } from './utils/CameraUtils'; import { abilityAccessCtrl, bundleManager, common, PermissionRequestResult, Permissions } from '@kit.AbilityKit'; import { BusinessError, emitter } from '@kit.BasicServicesKit'; import Logger from './utils/Logger'; import { TwiceReqPermissionButtonComponent } from './component/TwiceReqPermissionButtonComponent'; import { StackXComponent } from './component/StackXComponent'; import LoadingDialog from '@lyb/loading-dialog'; import { DynamicsRouter } from 'common'; @Builder export function xsIndexBuilder() { xsIndex() } @Entry @Component struct xsIndex { @Provide cameraPosition: number = 1; // 固定为前置摄像头 @Provide notHasPermission: boolean = true; @Provide surfaceId: string = ''; @Provide timerShooting: number = 3; // 固定3秒 @Provide captureTimer: number = 0; @Provide isVisibleTimerSet: boolean = false; @Provide isVisibleTimer: boolean = false; @Provide isVisibleCapture: boolean = true; @Provide captureClickFlag: number = 0; @State autoCaptureStarted: boolean = false; // 标记是否已开始自动拍照 private uiContext: UIContext = this.getUIContext(); private cameraUtils = new CameraUtils(this.uiContext); checkPermissions(permission: Permissions) { let atManager = abilityAccessCtrl.createAtManager(); let bundleInfo = bundleManager.getBundleInfoForSelfSync(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION); let tokenID = bundleInfo.appInfo.accessTokenId; let authResults = atManager.checkAccessTokenSync(tokenID, permission); return authResults === abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED; } aboutToDisappear(): void { this.cameraUtils.releaseCamera(); } AppStorage.setOrCreate('cameraUtils', this.cameraUtils); let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager(); let context: Context = this.getUIContext().getHostContext() as common.UIAbilityContext; atManager.requestPermissionsFromUser(context, ['ohos.permission.CAMERA']) .then((data: PermissionRequestResult) => { if (data.authResults[0] === 0) { this.notHasPermission = false; this.cameraUtils.cameraShooting(this.cameraPosition, this.surfaceId, context); // 延迟启动自动拍照，等待相机初始化完成 setTimeout(() => { this.startAutoCapture(); }, 500); } else if (data.authResults[0] === -1) { this.notHasPermission = true; } }) .catch((err: BusinessError) => { Logger.error(`data: ${JSON.stringify(err)}`); }); } // 开始自动拍照流程 startAutoCapture(): void { if (this.autoCaptureStarted || this.notHasPermission) { return; } this.autoCaptureStarted = true; this.isVisibleTimer = true; this.captureTimer = this.timerShooting; this.isVisibleCapture = false; // 3秒后自动拍照 setTimeout(() => { this.cameraUtils.capture(true); // 前置摄像头需要镜像 this.captureClickFlag = this.captureClickFlag + 1; this.isVisibleCapture = true; this.isVisibleTimer = false; }, this.captureTimer * 1000); } onPageShow() { if (!this.notHasPermission) { let permissions: Permissions = 'ohos.permission.CAMERA'; if (this.checkPermissions(permissions)) { this.cameraUtils.cameraShooting(this.cameraPosition, this.surfaceId, this.getUIContext().getHostContext()!); this.notHasPermission = false; // 如果还没有开始自动拍照，则启动 if (!this.autoCaptureStarted) { setTimeout(() => { this.startAutoCapture(); }, 500); } } else { this.notHasPermission = true; } } } onPageHide(): void { if (!this.notHasPermission) { this.cameraUtils.releaseCamera(); } } build() { NavDestination() { Column() { if (this.notHasPermission) { TwiceReqPermissionButtonComponent(); } else { Row() { Image($r('app.media.back')) .width(25) .height(25) .onClick(() => { DynamicsRouter.pop() }) }.width('100%').padding(15) StackXComponent(); } } .height(CameraConstants.FULL_SCREEN) .width(CameraConstants.FULL_SCREEN) .backgroundColor(Color.White) // 白色背景 .padding({ top: this.uiContext.px2vp(AppStorage.get('topAvoid')) as number, bottom: this.uiContext.px2vp(AppStorage.get('bottomAvoid')) as number }); }.hideBackButton(true) } }
