package com.basel.student_services;

public class LoginScreen extends AppCompatActivity {`

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

    setContentView(R.layout.activity_login_screen);

    Toolbar tb = (Toolbar)findViewById(R.id.login_tb);
    setSupportActionBar(tb);

}

public void login(View view) {
    EditText user = (EditText)findViewById(R.id.user);
    EditText pass = (EditText)findViewById(R.id.pass);

    Intent myIntent = new Intent(this , Main.class);
    Bundle myBundle = new Bundle();
    myBundle.putString("txturs", user.getText().toString());
    myBundle.putString("txtpas", pass.getText().toString());
    myIntent.putExtras(myBundle);
    startActivity(myIntent);

}
}

package com.basel.student_services;

        public class Main extends AppCompatActivity {``
Toolbar tb;

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

    Bundle bundleOfMain = getIntent().getExtras();
    String usr = bundleOfMain.getString("txturs");
    String pas = bundleOfMain.getString("txtpas");

    TextView tv = (TextView)findViewById(R.id.textView2);
            tv.setText(usr +"n"+ pas);

    tb = (Toolbar)findViewById(R.id.main_toolbar);
    setSupportActionBar(tb);

}

@Override
public boolean onCreateOptionsMenu(Menu menu){
    MenuInflater m = getMenuInflater();
    m.inflate(R.menu.main_activity_menu, menu);
    return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item ){

    int id = item.getItemId();
    if (id == R.id.men1){
        Toast.makeText(this , "clicked 1" , Toast.LENGTH_LONG).show();
    }

    return super.onOptionsItemSelected(item);

}

}