{

[Activity(Label = "AndroidCameraApps", MainLauncher = true, Icon = "@drawable/icon",Theme ="@style/MyTheme")]

public class MainActivity : AppCompatActivity

{

private static Android.Hardware.Camera camera=null;

private Parameters mParams;

private bool isFlashLight;

private ImageView btnFlash;

private MediaPlayer player;

protected override void OnCreate(Bundle bundle)

{

base.OnCreate(bundle);

// Set our view from the "main" layout resource

SetContentView(Resource.Layout.Main);

var toolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);

SetSupportActionBar(toolbar);

SupportActionBar.Title = "Flash Light";

btnFlash = FindViewById<ImageView>(Resource.Id.imageView);

player = MediaPlayer.Create(this, Resource.Raw.sound_click);

btnFlash.Click += delegate {

FlashLight();

};

bool hasFlash = ApplicationContext.PackageManager.HasSystemFeature(Android.Content.PM.PackageManager.FeatureCameraFlash);

if (!hasFlash)

{

Android.App.AlertDialog alert = new Android.App.AlertDialog.Builder(this).Create();

alert.SetTitle("Error");

alert.SetMessage("Sorry,your device doesn't support flash light");

alert.SetButton("OK", (s, e) => { return; });

alert.Show();

}

getCamera();

}

private void getCamera()

{

if (camera == null)

{

try

{

camera = Android.Hardware.Camera.Open();

mParams = camera.GetParameters();

}

catch(RuntimeException ex)

{

Log.Info("ERROR", ex.Message);

}

}

}

private void FlashLight()

{

if (camera == null || mParams == null)

return;

if (!isFlashLight)

{

player.Start();

//mParams = camera.GetParameters();

//mParams.FlashMode = Parameters.FlashModeTorch;

//camera.SetParameters(mParams);

//camera.StartPreview();

//isFlashLight = true;

//btnFlash.SetImageResource(Resource.Drawable.power_on);

camera.Release();

camera = null;

camera = Android.Hardware.Camera.Open();

Android.Hardware.Camera.Parameters mParams = camera.GetParameters();

mParams.FlashMode = (Android.Hardware.Camera.Parameters.FlashModeTorch);

camera.SetParameters(mParams);

var mPreviewTexture = new SurfaceTexture(0);

camera.SetPreviewTexture(mPreviewTexture);

camera.StartPreview();

btnFlash.SetImageResource(Resource.Drawable.power_on);

isFlashLight = true;

}

else

{

//camera.Release();

//camera.StopPreview();

//camera = null;

//player.Start();

//mParams = camera.GetParameters();

//mParams.FlashMode = Parameters.FlashModeOff;

//camera.SetParameters(mParams);

//camera.StartPreview();

//isFlashLight = false;

//btnFlash.SetImageResource(Resource.Drawable.power_off);

camera.Release();

camera = null;

camera = Android.Hardware.Camera.Open();

Android.Hardware.Camera.Parameters mParams = camera.GetParameters();

mParams.FlashMode = (Android.Hardware.Camera.Parameters.FlashModeOff);

camera.SetParameters(mParams);

var mPreviewTexture = new SurfaceTexture(0);

camera.SetPreviewTexture(mPreviewTexture);

camera.StartPreview();

btnFlash.SetImageResource(Resource.Drawable.power_off);

isFlashLight = false;

}

}

}

}