鸿蒙HarmonyOS系统相机Camera相关API使用

shaodong11232024-11-27 23:32

HarmonyOS下Camera相机相关API使用

准备工作

1. 导入camera接口

javascript 复制代码 
import { camera } from '@kit.CameraKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';

2.获取cameraManager对象

javascript 复制代码 
getCameraManager(): camera.CameraManager {
    let cameraManager: camera.CameraManager = camera.getCameraManager(getContext(this));
    console.error("01 cameraManager."+cameraManager);
    return cameraManager;
  }

3.通过cameraManager类中的getSupportedCameras方法

javascript 复制代码 
getCameraDevices(cameraManager: camera.CameraManager): Array<camera.CameraDevice> {
    let cameraArray: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
    this.showContent = ''
    if (cameraArray != undefined && cameraArray.length > 0) {
      this.showContent = '支持的相机设备数量：' + cameraArray.length
      for (let index = 0; index < cameraArray.length; index++) {
        console.info('cameraId : ' + cameraArray[index].cameraId); // 获取相机ID
        console.info('cameraPosition : ' + cameraArray[index].cameraPosition); // 获取相机位置
        console.info('cameraType : ' + cameraArray[index].cameraType); // 获取相机类型
        console.info('connectionType : ' + cameraArray[index].connectionType); // 获取相机连接类型
        this.showContent = 'cameraId:' + cameraArray[index].cameraId + '|cameraType:' + cameraArray[index].cameraType + '|connectionType:' + cameraArray[index].connectionType

      }
      return cameraArray;
    } else {
      console.error("cameraManager.getSupportedCameras error");
      this.errorContent = ' cameraManager.getSupportedCameras error'
      return [];
    }
  }

4.创建相机输入流

javascript 复制代码 
createInput(cameraDevice: camera.CameraDevice, cameraManager: camera.CameraManager): Promise<camera.CameraInput | undefined> {
  // 创建相机输入流
  let cameraInput: camera.CameraInput | undefined = undefined;
  try {
    cameraInput = cameraManager.createCameraInput(cameraDevice);
  } catch (error) {
    let err = error as BusinessError;
    console.error('Failed to createCameraInput errorCode = ' + err.code);
  }
  if (cameraInput === undefined) {
    return undefined;
  }
  // 监听cameraInput错误信息
  cameraInput.on('error', cameraDevice, (error: BusinessError) => {
    console.error(`Camera input error code: ${error.code}`);
  });
  // 打开相机
  await cameraInput.open();
  return cameraInput;
}

5.获取当前相机设备支持的所有输出流

javascript 复制代码 
 async getSupportedOutputCapability(cameraDevice: camera.CameraDevice, cameraManager: camera.CameraManager): Promise<camera.CameraOutputCapability | undefined> {
    // 创建相机输入流
    let cameraInput: camera.CameraInput | undefined = undefined;
    try {
      cameraInput = cameraManager.createCameraInput(cameraDevice);
    } catch (error) {
      let err = error as BusinessError;
      console.error('Failed to createCameraInput errorCode = ' + err.code);
    }
    if (cameraInput === undefined) {
      return undefined;
    }
    // 监听cameraInput错误信息
    cameraInput.on('error', cameraDevice, (error: BusinessError) => {
      console.error(`Camera input error code: ${error.code}`);
      this.errorContent = `Camera input error code: ${error.code}`
    });
    // 打开相机
    await cameraInput.open();
    // 获取相机设备支持的输出流能力
    let cameraOutputCapability: camera.CameraOutputCapability = cameraManager.getSupportedOutputCapability(cameraDevice);
    if (!cameraOutputCapability) {
      console.error("cameraManager.getSupportedOutputCapability error");
      return undefined;
    }
    console.info("outputCapability: " + JSON.stringify(cameraOutputCapability));
    this.showContent = 'cameraOutputCapability: ' + JSON.stringify(cameraOutputCapability)
    return cameraOutputCapability;
  }

6.创建一个会话

javascript 复制代码 
 getSession(cameraManager: camera.CameraManager): camera.Session | undefined {
  let session: camera.Session | undefined = undefined;
  try {
    session = cameraManager.createSession(camera.SceneMode.NORMAL_PHOTO) as camera.PhotoSession;
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to create the session instance. error: ${JSON.stringify(err)}`);
  }
  return session;
}

7.配置会话

javascript 复制代码 
 beginConfig(photoSession: camera.PhotoSession): void {
  try {
    photoSession.beginConfig();
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to beginConfig. error: ${JSON.stringify(err)}`);
  }
}

8.向会话中添加相机的输入流和输出流

javascript 复制代码 
 startSession(photoSession: camera.PhotoSession, cameraInput: camera.CameraInput, previewOutput: camera.PreviewOutput, photoOutput: camera.PhotoOutput): Promise<void> {
  try {
    photoSession.addInput(cameraInput);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to addInput. error: ${JSON.stringify(err)}`);
  }
  try {
    photoSession.addOutput(previewOutput);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to add previewOutput. error: ${JSON.stringify(err)}`);
  }
  try {
    photoSession.addOutput(photoOutput);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to add photoOutput. error: ${JSON.stringify(err)}`);
  }
  try {
    await photoSession.commitConfig();
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to commitConfig. error: ${JSON.stringify(err)}`);
  }

  try {
    await photoSession.start();
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to start. error: ${JSON.stringify(err)}`);
  }
}

预览

1.创建Surface, 通过XComponent获取surfaceID

javascript 复制代码 
 XComponent({
        id: 'xComponentId',
        type: XComponentType.SURFACE,
        libraryname: 'nativerender',
        controller: this.mXComponentController
      })
        .width(this.isLand ? this.isVideoFullScreen ? '100%' : '75%' : CommonConstants.FULL_PERCENT)
        .height(this.isLand ?
          this.isVideoFullScreen ? mScreenUtils.getScreenWidth() * this.videoHeight / this.videoWidth : mScreenUtils.getScreenWidth() * 0.75 * this.videoHeight / this.videoWidth :
          mScreenUtils.getScreenWidth() * this.videoHeight / this.videoWidth)
        .onLoad(() => {
          // this.mXComponentController.setXComponentSurfaceSize({ surfaceWidth: 1920, surfaceHeight: 1080 })
          let surfaceID = this.mXComponentController.getXComponentSurfaceId()
      
        })

2.创建预览输出流

javascript 复制代码 
 getPreviewOutput(cameraManager: camera.CameraManager, cameraOutputCapability: camera.CameraOutputCapability, surfaceId: string): camera.PreviewOutput | undefined {
  let previewProfilesArray: Array<camera.Profile> = cameraOutputCapability.previewProfiles;
  let previewOutput: camera.PreviewOutput | undefined = undefined;
  try {
    previewOutput = cameraManager.createPreviewOutput(previewProfilesArray[0], surfaceId);
  } catch (error) {
    let err = error as BusinessError;
    console.error("Failed to create the PreviewOutput instance. error code: " + err.code);
  }
  return previewOutput;
}

3.输出预览流

javascript 复制代码 
startPreviewOutput(cameraManager: camera.CameraManager, previewOutput: camera.PreviewOutput): Promise<void> {
  let cameraArray: Array<camera.CameraDevice> = [];
  cameraArray = cameraManager.getSupportedCameras();
  if (cameraArray.length == 0) {
    console.error('no camera.');
    return;
  }
  // 获取支持的模式类型
  let sceneModes: Array<camera.SceneMode> = cameraManager.getSupportedSceneModes(cameraArray[0]);
  let isSupportPhotoMode: boolean = sceneModes.indexOf(camera.SceneMode.NORMAL_PHOTO) >= 0;
  if (!isSupportPhotoMode) {
    console.error('photo mode not support');
    return;
  }
  let cameraInput: camera.CameraInput | undefined = undefined;
  cameraInput = cameraManager.createCameraInput(cameraArray[0]);
  if (cameraInput === undefined) {
    console.error('cameraInput is undefined');
    return;
  }
  // 打开相机
  await cameraInput.open();
  let session: camera.PhotoSession = cameraManager.createSession(camera.SceneMode.NORMAL_PHOTO) as camera.PhotoSession;
  session.beginConfig();
  session.addInput(cameraInput);
  session.addOutput(previewOutput);
  await session.commitConfig();
  await session.start();
}

拍照

1.导入image接口

javascript 复制代码 
import { image } from '@kit.ImageKit';
import { camera } from '@kit.CameraKit';
import { fileIo as fs } from '@kit.CoreFileKit';
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { BusinessError } from '@kit.BasicServicesKit';

2. 创建拍照输出流

javascript 复制代码 
getPhotoOutput(cameraManager: camera.CameraManager, cameraOutputCapability: camera.CameraOutputCapability): camera.PhotoOutput | undefined {
  let photoProfilesArray: Array<camera.Profile> = cameraOutputCapability.photoProfiles;
  if (!photoProfilesArray) {
    console.error("createOutput photoProfilesArray == null || undefined");
  }
  let photoOutput: camera.PhotoOutput | undefined = undefined;
  try {
    photoOutput = cameraManager.createPhotoOutput(photoProfilesArray[0]);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to createPhotoOutput. error: ${JSON.stringify(err)}`);
  }
  return photoOutput;
}

3.设置拍照回调，保存图片

javascript 复制代码 
 setPhotoOutputCb(photoOutput: camera.PhotoOutput) {
//设置回调之后，调用photoOutput的capture方法，就会将拍照的buffer回传到回调中
  photoOutput.on('photoAvailable', (errCode: BusinessError, photo: camera.Photo): void => {
     console.info('getPhoto start');
     console.info(`err: ${JSON.stringify(errCode)}`);
     if (errCode || photo === undefined) {
       console.error('getPhoto failed');
       return;
     }
     let imageObj: image.Image = photo.main;
     imageObj.getComponent(image.ComponentType.JPEG, (errCode: BusinessError, component: image.Component): void => {
       console.info('getComponent start');
       if (errCode || component === undefined) {
         console.error('getComponent failed');
         return;
       }
       let buffer: ArrayBuffer;
       if (component.byteBuffer) {
         buffer = component.byteBuffer;
       } else {
         console.error('byteBuffer is null');
         return;
       }
       // 如需要在图库中看到所保存的图片、视频资源，请使用用户无感的安全控件创建媒体资源。

       // buffer处理结束后需要释放该资源，如果未正确释放资源会导致后续拍照获取不到buffer
       imageObj.release(); 
     });
   });
}

4.参数配置（闪光灯、变焦、焦距等）

javascript 复制代码 
 configuringSession(photoSession: camera.PhotoSession): void {
  // 判断设备是否支持闪光灯
  let flashStatus: boolean = false;
  try {
    flashStatus = photoSession.hasFlash();
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to hasFlash. error: ${JSON.stringify(err)}`);
  }
  console.info(`Returned with the flash light support status: ${flashStatus}`);
  if (flashStatus) {
    // 判断是否支持自动闪光灯模式
    let flashModeStatus: boolean = false;
    try {
      let status: boolean = photoSession.isFlashModeSupported(camera.FlashMode.FLASH_MODE_AUTO);
      flashModeStatus = status;
    } catch (error) {
      let err = error as BusinessError;
      console.error(`Failed to check whether the flash mode is supported. error: ${JSON.stringify(err)}`);
    }
    if (flashModeStatus) {
      // 设置自动闪光灯模式
      try {
        photoSession.setFlashMode(camera.FlashMode.FLASH_MODE_AUTO);
      } catch (error) {
        let err = error as BusinessError;
        console.error(`Failed to set the flash mode. error: ${JSON.stringify(err)}`);
      }
    }
  }
  // 判断是否支持连续自动变焦模式
  let focusModeStatus: boolean = false;
  try {
    let status: boolean = photoSession.isFocusModeSupported(camera.FocusMode.FOCUS_MODE_CONTINUOUS_AUTO);
    focusModeStatus = status;
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to check whether the focus mode is supported. error: ${JSON.stringify(err)}`);
  }
  if (focusModeStatus) {
    // 设置连续自动变焦模式
    try {
      photoSession.setFocusMode(camera.FocusMode.FOCUS_MODE_CONTINUOUS_AUTO);
    } catch (error) {
      let err = error as BusinessError;
      console.error(`Failed to set the focus mode. error: ${JSON.stringify(err)}`);
    }
  }
  // 获取相机支持的可变焦距比范围
  let zoomRatioRange: Array<number> = [];
  try {
    zoomRatioRange = photoSession.getZoomRatioRange();
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to get the zoom ratio range. error: ${JSON.stringify(err)}`);
  }
  if (zoomRatioRange.length <= 0 ) {
    return;
  }
  // 设置可变焦距比
  try {
    photoSession.setZoomRatio(zoomRatioRange[0]);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to set the zoom ratio value. error: ${JSON.stringify(err)}`);
  }
}

5.拍照

主要通过photoOutput类的capture方法，执行拍照任务
objectivec 复制代码 
capture(captureLocation: camera.Location, photoOutput: camera.PhotoOutput): void {
    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
      location: captureLocation, // 设置图片地理位置
      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)}`);
        this.errorContent = '`Failed to capture the photo. error: ' + JSON.stringify(err)
        return;
      }
      console.info('Callback invoked to indicate the photo capture request success.');
      this.showContent = ' photo capture success'
    });
  }
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