MainActivity.java

package com.example.phonergb;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.content.Intent;
import android.widget.Button;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_main);

        Button btnlogout = (Button) findViewById(R.id.btn_logout);
        btnlogout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                final AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("Exit application");
                builder.setMessage("Do you want to exit ??");
                builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {

                        finish();

                    }
                });

                builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {

                        dialogInterface.dismiss();
                    }
                });

                AlertDialog dialog = builder.create();
                dialog.show();
            }
        });



        Button nextpage = (Button) findViewById(R.id.nextpage);
        nextpage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openNewActivity();
            }
        });





    }




    public void openNewActivity () {
        Intent intent = new Intent ( MainActivity.this, secondpage.class);
        startActivity(intent);
    }}