#if UNITY_EDITOR && UNITY_STANDALONE_WIN
#if UNITY_ANDROID

Update(){}

#if UNITY_STANDALONE_WIN
   10000 строк кода
#endif
#if UNITY_ANDROID
   10000 строк кода
#endif

public interface IInputController {

    List<Vector3> OnTouch();

    bool IsCursorMoving();

    bool IsTouchEnd();
}

public class WinController : MonoBehaviour, IInputController {

    public List<Vector3> OnTouch() {
        List<Vector3> list = new List<Vector3>();

        if (Input.GetMouseButton(0))
            list.Add(Input.mousePosition);

        return list;
    }


    public bool IsCursorMoving() {
        if (Input.GetAxis("Mouse X") != 0 || Input.GetAxis("Mouse Y") != 0)
            return true;

        return false;
    }


    public bool IsTouchEnd() {
        if (Input.GetMouseButtonUp(0)) {
            return true;
        }

        return false;
    }
}

public class AndroidController : MonoBehaviour, IInputController {

    private const int MAX_COUNT_TOUCHES = 2;

    public List<Vector3>  OnTouch() {
        List<Vector3> list = new List<Vector3>();

        for (var i = 0; i < Input.touchCount; ++i) {
            var phase = Input.GetTouch(i).phase;
            if (phase == TouchPhase.Stationary || phase == TouchPhase.Moved) {
                list.Add(Input.GetTouch(i).position);
            }
            if (list.Count >= MAX_COUNT_TOUCHES)
                break;
        }

        return list;
    }


    public bool IsCursorMoving() {
        if (Input.GetTouch(0).phase == TouchPhase.Moved)
            return true;

        return false;
    }


    public bool IsTouchEnd() {
        for (var i = 0; i < Input.touchCount; ++i) {
            var phase = Input.GetTouch(i).phase;
            if (phase == TouchPhase.Ended)
                return true;
        }

        return false;
    }
}

class ControlScript : MonoBehaviour {
    public IInputController inputController;

    void Start() {
        inputController = GetInputController();
    }

    private IInputController GetInputController() {
        IInputController controller = GetComponent<WinController>();

        #if UNITY_STANDALONE_WIN
           IInputController controller = GetComponent<WinController>();
        #endif
        #if UNITY_ANDROID
           IInputController controller = GetComponent<AndroidController>();
        #endif

        return controller;
    }
}

void Update() {
    if (inputController.IsTouchEnd())
        Debug.Log("Пожалуюсь в спец органы на тебя!");

    if (inputController.OnTouch().Count > 0)
        Debug.Log("Че тыкаешь?");

    if (inputController.IsCursorMoving())
        Debug.Log("А-а-а, помогите, спасите, меня тошнит!");
}

RuntimePlatform platform = Application.platform;
if(platform == RuntimePlatform.Android || platform == RuntimePlatform.IPhonePlayer) {
    // do smth
}