First - Main Activity

 package com.example.hupandroid1;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

EditText username,password;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

public void login(View v)

{

username=(EditText)findViewById(R.id.editText1);

password=(EditText)findViewById(R.id.editText2);

String uname=username.getText().toString();

String pass=password.getText().toString();

if(uname.equals("admin") && pass.equals("123"))

{

//Toast.makeText(this, "Success", Toast.LENGTH_SHORT).show();

Intent in=new Intent(MainActivity.this,SalaryActivity.class);

startActivity(in);

}

else

{

Toast.makeText(this, "Invalid User", Toast.LENGTH_SHORT).show();

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

}