AndroidCamera实现毫秒级拍照实例-创新互联

我们知道自定义Camera需要以下几步

1. 打开相机，即实例化Camera对象，Camera camera = Camera.open();
2. 设置Camera的相关参数，Camera.Parameters parameters = camera.getParameters();
3. 打开预览，camera.setPreviewDisplay(surfaceholder); camera.startPreview();
4. 获取图片，这里只是从预览中获取因此使用，camera.setPreviewCallback(new Camera.PreviewCallback(){……..});
5. 停止预览，释放相机，camera.stopPreview();camera.release();

1、打开相机

public static Camera openFacingBackCamera() {
    Camera cam = null;
    Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
    for (int camIdx = 0, cameraCount = Camera.getNumberOfCameras(); camIdx < cameraCount; camIdx++) {
      Camera.getCameraInfo(camIdx, cameraInfo);
      if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        try {
          //打开相应的摄像头，目前是前置摄像头
          cam = Camera.open(camIdx);
        } catch (RuntimeException e) {
          e.printStackTrace();
          if (cam!=null){
            cam.stopPreview();
            cam.release();
          }
          cam = null;
        }
      }
    }
    return cam;
  }