unity share current game screen

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System.IO;

public class TakeScreenshot : MonoBehaviour
{
    [Header("Managers")]
    public GameObject SM;

    private bool isProcessing = false;
    public float startX;
    public float startY;
    public int valueX;
    public int valueY;

    public void shareScreenshot()
    {

        if (!isProcessing)
            StartCoroutine(captureScreenshot());
    }

    public IEnumerator captureScreenshot()
    {
        isProcessing = true;

        //Wait for 1 second while we close the shop panel
        //ui change do here
        yield return new WaitForSeconds();

        yield return new WaitForEndOfFrame();

        Texture2D screenTexture = new Texture2D(Screen.width, Screen.height);

        screenTexture.ReadPixels(new Rect(, , Screen.width, Screen.height), , );

        // apply
        screenTexture.Apply();

        //------------------------------------------------------- PHOTO

        byte[] dataToSave = screenTexture.EncodeToPNG();

        string destination = Path.Combine(Application.persistentDataPath, System.DateTime.Now.ToString("yyyy-MM-dd-HHmmss") + ".png");

        File.WriteAllBytes(destination, dataToSave);

        if (!Application.isEditor)
        {
            // block to open the file and share it ------------START
            AndroidJavaClass intentClass = new AndroidJavaClass("android.content.Intent");
            AndroidJavaObject intentObject = new AndroidJavaObject("android.content.Intent");
            intentObject.Call<AndroidJavaObject>("setAction", intentClass.GetStatic<string>("ACTION_SEND"));
            AndroidJavaClass uriClass = new AndroidJavaClass("android.net.Uri");
            AndroidJavaObject uriObject = uriClass.CallStatic<AndroidJavaObject>("parse", "file://" + destination);
            intentObject.Call<AndroidJavaObject>("putExtra", intentClass.GetStatic<string>("EXTRA_STREAM"), uriObject);
            intentObject.Call<AndroidJavaObject>("putExtra", intentClass.GetStatic<string>("EXTRA_TEXT"), "");
            intentObject.Call<AndroidJavaObject>("putExtra", intentClass.GetStatic<string>("EXTRA_SUBJECT"), "");
            intentObject.Call<AndroidJavaObject>("setType", "image/jpeg");
            AndroidJavaClass unity = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
            AndroidJavaObject currentActivity = unity.GetStatic<AndroidJavaObject>("currentActivity");

            // option one WITHOUT chooser:
            currentActivity.Call("startActivity", intentObject);

            // block to open the file and share it ------------END

        }
        isProcessing = false;

    }
}