CS_BS/MenuActivity.java

package com.example.WhatMeal;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Random;

public class EatWhatActivity extends AppCompatActivity
{
    MenuActivity.MyHelper myHelper;
    private TextView text_food;
    private TextView text_store;
    private Button btn_change;
    private Button b4;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_eatwhat);
        myHelper = new com.example.WhatMeal.MenuActivity.MyHelper(this);
        text_food = (TextView) findViewById(R.id.text_food);
        text_store = (TextView) findViewById(R.id.text_store);
        btn_change = (Button) findViewById(R.id.btn_change);
        btn_change.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                SQLiteDatabase db = myHelper.getReadableDatabase();
                Cursor c = db.query("information", null, null, null, null, null, null);
                int n = c.getCount() + 1;
                Random R = new Random();
                int i = R.nextInt(n - 1) + 1;
                c.moveToPosition(i);
                text_food.setText( "" + c.getString(1));
                text_store.setText("" + c.getString(2));
                c.close();
                db.close();
            }
        });

        b4 = (Button) findViewById(R.id.b4);
        b4.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Intent intent = new Intent(EatWhatActivity.this, MainActivity.class);
                startActivity(intent);
            }
        });
    }
}