HarmonyOS鸿蒙Next中怎么写app里面的相机功能

配置权限和动态申请权限

// config.json

{
  "reqPermissions": [
    {"name": "ohos.permission.CAMERA"},
    {"name": "ohos.permission.MICROPHONE"},
    {"name": "ohos.permission.READ_MEDIA"},
    {"name": "ohos.permission.WRITE_MEDIA"}
  ]
}

import abilityAccessCtrl from '@kit.AbilityAccessCtrlKit';

async function requestPermissions() {
  const permissions: Array<string> = [
    'ohos.permission.CAMERA',
    'ohos.permission.MICROPHONE',
    'ohos.permission.READ_MEDIA',
    'ohos.permission.WRITE_MEDIA'
  ];
  const atManager = abilityAccessCtrl.createAtManager();
  try {
    await atManager.requestPermissionsFromUser(this.context, permissions);
  } catch (err) {
    console.error('Permission request failed: ' + JSON.stringify(err));
  }
}

相机功能

1 初始化相机服务

import camera from '@kit.CameraKit';

// 创建相机管理对象
let cameraManager = camera.createCameraManager();

// 获取可用相机列表
let cameras = cameraManager.getSupportedCameras();
let cameraObj = cameraManager.createCamera(cameras.cameraId);

2 配置视频输出

// 创建视频配置参数
let videoProfile: camera.VideoProfile = {
  format: camera.VideoFormat.VIDEO_DEFAULT,
  width: 1080,
  height: 1920,
  frameRate: 30
};

// 创建视频输出对象
let videoOutput: camera.VideoOutput;
videoOutput = cameraManager.createVideoOutput(videoProfile, surfaceId); // surfaceId为XComponent组件ID

3 创建录像会话

let captureSession: camera.VideoSession;
try {
  captureSession = cameraManager.createSession(camera.SceneMode.NORMAL_VIDEO) as camera.VideoSession;
  captureSession.beginConfig();
  captureSession.addInput(cameraObj);
  captureSession.addOutput(videoOutput);
  await captureSession.commitConfig();
  await captureSession.start();
} catch (error) {
  console.error('Session setup failed: ' + JSON.stringify(error));
}

视频录制控制

启动/停止录制

// 开始录制
videoOutput.start().then(() => {
  console.log('Video recording started');
});

// 停止录制
videoOutput.stop().then(() => {
  console.log('Video recording stopped');
});

保存视频到本地

import mediaLibrary from '@kit.MediaLibraryKit';

async function saveVideoToGallery(fileUri: string) {
  let mediaTest = mediaLibrary.getMediaLibrary();
  let publicPath = await mediaTest.getPublicDirectory(mediaLibrary.DirectoryType.DIR_VIDEO);
  let asset = await mediaTest.createAsset(
    mediaLibrary.MediaType.VIDEO,
    'my_video.mp4',
    publicPath + 'MyVideos/'
  );
  await mediaTest.commitModify(asset);
}

界面预览实现

// XComponent布局定义
XComponent({
  id: 'xc_preview',
  type: 'surface',
  controller: xcController
})
.onSurfaceCreate((surfaceId) => {
  // 将surfaceId传递给视频输出配置
  setupCameraPreview(surfaceId);
})

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