Flashlight

main.js

var app = require("tns-core-modules/application");
var plat = require("tns-core-modules/platform");

exports.turnOn = function (args) {
  flash(true);
}

exports.turnOff = function (args) {
  flash(false);
}

function flash(onOrOff) {
  if (plat.isAndroid) {
    flashAndroid(onOrOff);
  } else {
    flashIos(onOrOff);
  }
}

function flashAndroid(onOrOff) {
  var context = app.android.context;
  var cameraService = context.getSystemService(android.content.Context.CAMERA_SERVICE)
  var cameras = cameraService.getCameraIdList();

  for (var i = 0; i < cameras.length; i++) {
    var characteristics = cameraService.getCameraCharacteristics(cameras[i]);
    var flashAvailable = characteristics.get(android.hardware.camera2.CameraCharacteristics.FLASH_INFO_AVAILABLE) == "true";

    if (flashAvailable) {
      cameraService.setTorchMode(cameras[i], onOrOff);
    }
  }
}

function flashIos(onOrOff) {
  var device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo);
  device.lockForConfiguration(null);
  if (onOrOff) {
    device.setTorchModeOnWithLevelError(AVCaptureMaxAvailableTorchLevel, null);
    device.flashMode = AVCaptureFlashMode.AVCaptureFlashModeOn;
  } else {
    device.torchMode = AVCaptureTorchMode.AVCaptureTorchModeOff;
    device.flashMode = AVCaptureFlashMode.AVCaptureFlashModeOff;
  }
  device.unlockForConfiguration();
}