AndroidCamera.cs

// UnityからAndroidのCamera LEDを制御する例
//   startPreview() でカメラのプレビューを開始した状態で LEDOn() で光る

public class AndroidCamera {
	
	AndroidJavaObject camera = null;

	public AndroidCamera() {
		WebCamDevice[] devices = WebCamTexture.devices;
		Debug.Log("Camera Name:"+devices[0].name);
		
		open();
	}
	
	public void open()
	{
		if (camera == null) {
#if (UNITY_ANDROID && !UNITY_EDITOR)
			AndroidJavaClass cameraClass = new AndroidJavaClass("android.hardware.Camera");
			camera = cameraClass.CallStatic<AndroidJavaObject>("open");
#endif
		}
	}
	
	public void release()
	{
		if (camera != null) {
			LEDOff();
			
			camera.Call("release");
			camera = null;
		}
	}
	
	public void startPreview()
	{
		if (camera != null) {
			Debug.Log("AndroidCamera::startPreview()");
			camera.Call("startPreview");
		}
	}
	
	public void stopPreview()
	{
		if (camera != null) {
			Debug.Log("AndroidCamera::stopPreview()");
			LEDOff();
			camera.Call("stopPreview");
		}
	}

	// Flashモードの設定	
	private void setFlashMode(string mode)
	{		
		if (camera != null) {
			AndroidJavaObject cameraParameters = camera.Call<AndroidJavaObject>("getParameters");
			cameraParameters.Call("setFlashMode",mode);			
			camera.Call("setParameters",cameraParameters);
		}
	}
	
	// LED点灯
	public  void LEDOn() {
		setFlashMode("torch");
	}

	// LED消灯
	public void LEDOff() {
		setFlashMode("off");
	}
}

Hello It is not working. Do you know the reason?