闪光灯

 public void disableFlashLight() {
    if (camera != null) {
      Camera.Parameters parameters = camera.getParameters();
      parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
      camera.setParameters(parameters);
    }
  }

 public void enableFlashLight() {
      if (camera != null) {
        Camera.Parameters parameters = camera.getParameters();
          parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
          camera.setParameters(parameters);
      }
  }

 private void flashLightOff(){
        if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)){
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
                CameraManager cameraManager = (CameraManager) Objects.requireNonNull(getActivity()).getSystemService(Context.CAMERA_SERVICE);
                try {
                    String cameraId = cameraManager.getCameraIdList()[0];
                    cameraManager.setTorchMode(cameraId,false);
                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }
            }
        }else {
            Toast.makeText(context, "No Flash Light Available", Toast.LENGTH_SHORT).show();
        }

    }

 private void flashLightOn(){
        if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)){
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                CameraManager cameraManager = (CameraManager) Objects.requireNonNull(getActivity()).getSystemService(Context.CAMERA_SERVICE);
                try {
                    String cameraID = cameraManager.getCameraIdList()[0];
                        cameraManager.setTorchMode(cameraID,true);

                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }
            }
        }else {
            Toast.makeText(context, "No Flash Light Available", Toast.LENGTH_SHORT).show();
        }
    }