Delete MainActivity.java

package com.example.toast;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    String[] toasts = {"Wanna hear a joke?", "It's quiz time! Let's meet at PHO.", "You guys look tired, let's take a break."};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    @Override

    protected void onStart() {

        super.onStart();

        int ii = 0;

        while (true) {

            try {

                Thread.sleep(5000);

                Toast.makeText(this,toasts[ii],Toast.LENGTH_SHORT).show();

                if (ii<2) {

                    ii++;

                } else {

                    ii = 0;

                }

            } catch (InterruptedException e) {

                throw new RuntimeException(e);

            }

        }

    }

}

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