Create a login application as above, on successful login redirect to another activity with logout button a dialog appears with OK and CANCEL button. On OK button click go to login activity and CANCEL stay at same activity.

/*Create a login application as above, on successful login redirect to 

another activity with logout button a dialog appears with OK and CANCEL button. On OK button click go to 

login activity and CANCEL stay at same activity.*/

File Name: activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout 

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/activity_main"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.ducskecode.login_logout.MainActivity">

    <EditText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:inputType="textPassword"

        android:ems="15"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="188dp"

        android:id="@+id/editTextPass1"

        android:hint="password" />

    <EditText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:inputType="textPersonName"

        android:ems="15"

        android:layout_alignBottom="@+id/editTextPass"

        android:layout_alignEnd="@+id/editTextPass"

        android:layout_marginBottom="85dp"

        android:id="@+id/editTextUser1"

        android:hint="username" />

    <Button

        android:text="Login"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/editTextPass"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="72dp"

        android:id="@+id/button1" />

</RelativeLayout>

File Name: MainActivity.java

package com.ducskecode.login_logout;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import static android.R.attr.value;

public class MainActivity extends AppCompatActivity {

    EditText username, password;

    Button login;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    username = (EditText) findViewById(R.id.editTextUser1);

    password = (EditText) findViewById(R.id.editTextPass1);

    login = (Button) findViewById(R.id.button1);

    login.setOnClickListener(new View.OnClickListener() {

   @Override

    public void onClick(View v) {

    if(username.getText().toString().equals("admin") &&

    password.getText().toString().equals("admin")){

    Intent i = new Intent(MainActivity.this.getApplicationContext(),

    Logout.class);

    i.putExtra("message", value);

    startActivity(i);

            }

      else{

       Toast.makeText(MainActivity.this, "Invalid Details",

             Toast.LENGTH_SHORT().show();

               }

            }

        });

    }

}

File Name: logout.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout 

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical" android:layout_width="match_parent"

    android:layout_height="match_parent">

    <Button

        android:text="Logout"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="130dp"

        android:id="@+id/buttonLogout" />

</RelativeLayout>

File Name: Logout.java

package com.ducskecode.login_logout;

import android.app.Activity;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.support.v7.app.AlertDialog;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import static android.content.ContentValues.TAG;

/**

 * Created by Parikshit.

 */

public class Logout extends MainActivity {

Button Logout;

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.logout);

        Logout = (Button) findViewById(R.id.buttonLogout);

        Intent in = getIntent();

        String string = in.getStringExtra("message");

        Logout.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                AlertDialog.Builder builder = new AlertDialog.Builder(Logout.this);

                builder.setTitle("Confirmation PopUp!").

                        setMessage("You sure, that you want to logout?");

                builder.setPositiveButton("Yes",

                        new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog, int id) {

                                Intent i = new Intent(getApplicationContext(),

                                        MainActivity.class);

                                startActivity(i);

                            }

                        });

                builder.setNegativeButton("No",

                        new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog, int id) {

                                dialog.cancel();

                            }

                        });

                AlertDialog alert11 = builder.create();

                alert11.show();

            }

        });

    }

}