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The registration screen is where new employees create their ThunderRAR account before they can log in. It is implemented by activity_registro and reached by pressing the REGISTRARSE button on the login screen. After a successful registration the screen passes the chosen username and password back to MainActivity as Intent extras, which MainActivity then stores in memory and uses for credential validation during login.

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UI Elements

The registration screen uses a ConstraintLayout with the same background image as the login screen (fondo_pantalla_inico). All interactive elements are grouped inside a centred LinearLayout:
ElementID / TypeDescription
Title labeltextView6 / TextViewDisplays the string Registrarse in white at 50 sp.
Username fieldreg_usuario / EditTextAccepts free text (inputType="text"). Minimum height 48 dp. Placeholder hint: USUARIO. White underline indicator.
Password fieldreg_password / EditTextAccepts secret input (inputType="textPassword"). Minimum height 48 dp. Placeholder hint: CONTRASEÑA. White underline indicator.
REGISTRARSE buttonbutton3 / ButtonBlue background (#0029FF), white text at 18 sp. Triggers enviar(View) on click.

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Registration Logic

When the employee taps REGISTRARSE, the enviar(View) method runs the following steps:
1

Read field values

The text from reg_usuario and reg_password is read into local String variables.
2

Validate non-empty input

If either field is empty, a Toast prompts the user to fill both fields and the method returns early without creating an account.
3

Build and send Intent

A new Intent targeting MainActivity is created. The username is attached under the key "dato" and the password under "dato2" using putExtra. A success Toast is shown, then startActivity(i) navigates back to the login screen with the credentials bundled in the Intent.
activity_registro.java
public void enviar(View view) {
    String usuario = reg_usuario.getText().toString();
    String password = reg_password.getText().toString();
    if (usuario.isEmpty() || password.isEmpty()) {
        Toast.makeText(this, "Ingrese su usuario y contraseña",
            Toast.LENGTH_SHORT).show();
        return;
    }
    Intent i = new Intent(this, MainActivity.class);
    i.putExtra("dato", reg_usuario.getText().toString());
    i.putExtra("dato2", reg_password.getText().toString());
    Toast.makeText(this, "Registro exitoso", Toast.LENGTH_SHORT).show();
    startActivity(i);
}

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Intent Extras

The credentials are delivered to MainActivity via the following Intent extras:
KeyValueDescription
"dato"Username stringThe employee username entered in reg_usuario. Retrieved in MainActivity via getIntent().getStringExtra("dato").
"dato2"Password stringThe employee password entered in reg_password. Retrieved in MainActivity via getIntent().getStringExtra("dato2").
On the receiving end, MainActivity.onCreate() reads both extras immediately:
MainActivity.java
datoUsuarioRecibido    = getIntent().getStringExtra("dato");
dato2PasswordRecibido  = getIntent().getStringExtra("dato2");
These values are then used by inicioSesion(View) to validate login attempts.
Credentials passed via Intent extras are held in memory for the lifetime of the MainActivity instance. If the activity is destroyed — for example by the user pressing the back button, closing the app, or the system reclaiming memory — the stored credentials are lost and the employee must register again on the next launch.

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