larkintuckerllc

...
loginButton.setOnClickListener((v) -> {
    String login = loginEditText.getText().toString().trim();
    if (login.matches("")) {
        return;
    }
    Credentials credentials = MyApplication
        .plusAuthComponent()
        .getCredentials();
    credentials.setLogin(login);

larkintuckerllc

...
@Inject Credentials mCredentials;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    MyApplication.getAuthComponent().inject(this);
...

larkintuckerllc

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logoutButton.setOnClickListener((v) -> {
    MyApplication.clearAuthComponent();
    startActivity(new Intent(this, MainActivity.class));
    finish();
});
...

larkintuckerllc

...
@Scope
@Retention(RetentionPolicy.RUNTIME)
public @interface AuthScope {
}

larkintuckerllc

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@Module
public class AuthModule {

    @Provides
    @AuthScope
    static public Credentials provideCredentials(Greeting greeting) {
...

larkintuckerllc

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@AuthScope
public interface AuthComponent {
...

larkintuckerllc

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public class CredentialsImpl implements Credentials {

    private String mLogin;
    private Greeting mGreeting;

    CredentialsImpl(Greeting greeting) {
        mGreeting = greeting;
    }

larkintuckerllc

...
@Provides
@AuthScope
static public Credentials provideCredentials(Greeting greeting) {
   return new CredentialsImpl(greeting);
}
...

larkintuckerllc

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@Subcomponent(modules = AuthModule.class)
@AuthScope
public interface AuthComponent {
...

larkintuckerllc

...
@Singleton
@Component(modules = AppModule.class)
public interface AppComponent {

    AuthComponent plusAuthComponent();
...