foodcheck/HomeActivity.java

package com.example.health;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import com.example.health.food_grid.FoodGridActivity;
import com.example.health.foodlist.ListActivity;

public class HomeActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
    }

    public void onClick(View view) {
        Intent intent = new Intent();
        switch (view.getId()) {
            case R.id.homebutton1:
                intent.setClass(HomeActivity.this, ListActivity.class);
                break;
            case R.id.homebutton2:
                intent.setClass(HomeActivity.this, FoodGridActivity.class);
                break;
            case R.id.homebutton3:
                intent.setClass(HomeActivity.this,network.class);
        }
        startActivity(intent);
    }
}