<ImageButton android:id="@+id/buttonLogin"
    android:layout_width="140dp"
    android:layout_height="50dp"
    android:background="@drawable/login5"
    />

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    unameEdit = (EditText) findViewById(R.id.txtUsername);
    passEdit = (EditText) findViewById(R.id.txtPassword);
    loginButton = (Button) findViewById(R.id.buttonLogin);

    System.out.println("button login obtaied");
    loginButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            user = unameEdit.getText().toString().trim();
            pass = passEdit.getText().toString().trim();
            if (user.equalsIgnoreCase(pass)) {
                Toast.makeText(MainActivity.this, "Login Successfull",
                        Toast.LENGTH_LONG).show();
                // setContentView(R.layout.secondpage); Call Intent

                Intent i = new Intent(MainActivity.this, SecondClass.class);
                startActivity(i);
            } else {
                Toast.makeText(MainActivity.this,
                        "Check the Username/password", Toast.LENGTH_LONG)
                        .show();
            }

        }
    });
}
}

loginButton = (ImageButton) findViewById(R.id.buttonLogin);

if(getuname.matches("androidcoding") && getpwd.matches("androidcoding")){

                Intent i = new Intent(MainActivity.this,HomeScreen.class);
                startActivity(i);
            } else {

                Toast.makeText(MainActivity.this,
                    "enter correct username & password", Toast.LENGTH_LONG).show();

            }

        }
        });