NativeScreenshotShareUsingFileProvider.cs

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

public class NativeScreenshotShareUsingFileProvider : MonoBehaviour
{
    public  Button shareButton;

	private bool isFocus = false;

	private string shareSubject, shareMessage;
	private bool isProcessing = false;
	private string screenshotName;

	void  Start () {
		shareButton.onClick.AddListener (OnShareButtonClick);
	}


	void OnApplicationFocus (bool focus) {
		isFocus = focus;
	}

	public void OnShareButtonClick () {

		screenshotName = "fireblock_highscore.png";
		shareSubject = "I challenge you to beat my high score in Fire Block";
		shareMessage = "I challenge you to beat my high score in Fire Block. " +
		". Get the Fire Block app from the link below. \nCheers\n" +
		"\nhttp://onelink.to/fireblock";

		ShareScreenshot ();
	}


	private void ShareScreenshot () {

		#if UNITY_ANDROID
		if (!isProcessing) {
			StartCoroutine (ShareScreenshotInAnroid ());
		}

		#else
		Debug.Log("No sharing set up for this platform.");
		#endif
	}



	#if UNITY_ANDROID
	public IEnumerator ShareScreenshotInAnroid () {

		isProcessing = true;
		// wait for graphics to render
		yield return new WaitForEndOfFrame ();

		string screenShotPath = Application.persistentDataPath + "/" + screenshotName;
		ScreenCapture.CaptureScreenshot (screenshotName, 1);
		yield return new WaitForSeconds (0.5f);

		if (!Application.isEditor) {
			//current activity context
			AndroidJavaClass unity = new AndroidJavaClass ("com.unity3d.player.UnityPlayer");
			AndroidJavaObject currentActivity = unity.GetStatic<AndroidJavaObject> ("currentActivity");

			//Create intent for action send
			AndroidJavaClass intentClass = new AndroidJavaClass ("android.content.Intent");
			AndroidJavaObject intentObject = new AndroidJavaObject ("android.content.Intent");
			intentObject.Call<AndroidJavaObject> ("setAction", intentClass.GetStatic<string> ("ACTION_SEND"));

            //old code which is not allowed in Android 8 or above
			//create image URI to add it to the intent
			//AndroidJavaClass uriClass = new AndroidJavaClass ("android.net.Uri");
			//AndroidJavaObject uriObject = uriClass.CallStatic<AndroidJavaObject> ("parse", "file://" + screenShotPath);

            //create file object of the screenshot captured
			AndroidJavaObject fileObject = new AndroidJavaObject("java.io.File", screenShotPath);

            //create FileProvider class object
			AndroidJavaClass fileProviderClass = new AndroidJavaClass("android.support.v4.content.FileProvider");

			object[] providerParams = new object[3];
			providerParams[0] = currentActivity;
			providerParams[1] = "com.agrawalsuneet.unityclient.provider";
			providerParams[2] = fileObject;

            //instead of parsing the uri, will get the uri from file using FileProvider
			AndroidJavaObject uriObject = fileProviderClass.CallStatic<AndroidJavaObject>("getUriForFile", providerParams);

			//put image and string extra
			intentObject.Call<AndroidJavaObject> ("putExtra", intentClass.GetStatic<string> ("EXTRA_STREAM"), uriObject);
			intentObject.Call<AndroidJavaObject> ("setType", "image/png");
			intentObject.Call<AndroidJavaObject> ("putExtra", intentClass.GetStatic<string> ("EXTRA_SUBJECT"), shareSubject);
			intentObject.Call<AndroidJavaObject> ("putExtra", intentClass.GetStatic<string> ("EXTRA_TEXT"), shareMessage);

            //additionally grant permission to read the uri
			intentObject.Call<AndroidJavaObject> ("addFlags", intentClass.GetStatic<int>("FLAG_GRANT_READ_URI_PERMISSION") );
			
			AndroidJavaObject chooser = intentClass.CallStatic<AndroidJavaObject> ("createChooser", intentObject, "Share your high score");
			currentActivity.Call ("startActivity", chooser);
		}

		yield return new WaitUntil (() => isFocus);
		isProcessing = false;
	}
	#endif
}