Create Toast on Android Unity

MyPluginIsBananas.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MyPluginIsBananas : MonoBehaviour
{
	const string ToastClassName = "android.widget.Toast";
	
	public void OnMyButtonClick()
	{
		print("The cake is a lie!!");
		
		var toastJavaClass = new AndroidJavaClass(ToastClassName);

		const int duration = 1; // LENGTH_LONG in Android API
		const string text = "Hello world!"; // C# string is automatically converted to java.lang.String
		var context = GetUnityActivity();
		var javaToastObject = 
			toastJavaClass.CallStatic<AndroidJavaObject>("makeText", context, text, duration);
		javaToastObject.Call("show");
		
		toastJavaClass.Dispose();
	}

	AndroidJavaObject GetUnityActivity()
	{
		using (var unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
		{
			return unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
		}
	}
}