HarmonyOS鸿蒙Next中调用系统相机进行拍照示例

打开相机并拍照Demo：

import common from '@ohos.app.ability.common';


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

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)

        Button("camera Image").onClick(() => {
          const context = getContext(this) as common.UIAbilityContext
          console.log('sss')
          context.startAbilityForResult({
            action:"ohos.want.action.imageCapture",
            parameters:{
              callBundleName:"com.hm.imageshow"
              //拉起系统相机拍照后返回的应用包名
            }
          },(err, data) => {
            console.info("context:" + JSON.stringify(context))
            console.info("imageCapture:" + JSON.stringify(data))
          })
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}

获取相片uri数据可以采用下列方法：

let uri: string = (data?.want?.parameters as Record<string, Object))['resourceUri']?.toString(); //获取相片uri数据

在HarmonyOS鸿蒙Next中，调用系统相机进行拍照主要依赖CameraKit和Intent。以下是一个简单的示例代码，展示如何调用系统相机并获取拍照结果：

• 添加权限：在config.json中添加相机权限：

  {
    "module": {
      "reqPermissions": [
        {
          "name": "ohos.permission.CAMERA"
        }
      ]
    }
  }
  

• 创建相机调用代码：

  import camera from '[@ohos](/user/ohos).multimedia.camera';
  import abilityAccessCtrl from '[@ohos](/user/ohos).abilityAccessCtrl';
  import featureAbility from '[@ohos](/user/ohos).ability.featureAbility';
  
  // 请求相机权限
  async function requestCameraPermission() {
    let atManager = abilityAccessCtrl.createAtManager();
    try {
      await atManager.requestPermissionsFromUser(featureAbility.getContext(), ['ohos.permission.CAMERA']);
    } catch (err) {
      console.error('Failed to request camera permission:', err);
    }
  }
  
  // 调用系统相机拍照
  async function takePhoto() {
    await requestCameraPermission();
    const cameraKit = camera.getCameraKit();
    const cameras = await cameraKit.getCameras();
    if (cameras.length > 0) {
      const cameraDevice = cameras[0];
      const photoOutput = await cameraDevice.createPhotoOutput();
      const captureSession = await cameraKit.createCaptureSession();
      await captureSession.beginConfig();
      await captureSession.addOutput(photoOutput);
      await captureSession.commitConfig();
      await captureSession.start();
      const photo = await photoOutput.capture();
      console.log('Photo captured:', photo);
    }
  }
  

• 处理拍照结果：拍照结果可以通过photoOutput.capture()返回的Photo对象进行处理。

• 清理资源：在拍照完成后，确保释放相机资源：

  async function releaseCamera() {
    const cameraKit = camera.getCameraKit();
    const cameras = await cameraKit.getCameras();
    if (cameras.length > 0) {
      const cameraDevice = cameras[0];
      await cameraDevice.release();
    }
  }
  

以上代码展示了如何在HarmonyOS鸿蒙Next中调用系统相机进行拍照，并处理拍照结果。