Droid Talks S02E02

1. Começando no Data Bind
Rogério C. Santos

2. Sobre
Tech Lead - Sambatech - Kast (iOS, Android, back-end, front-end)
Bacharel S.I Puc - MG
Especialização Testes - UFPE Cin/Motorola
Mestrado Puc - MG
PalmOS, JavaME, C/C++, JavaEE, Linux/Unix ..
Puc, Una, Cefet MG, Uni, Izabela Hendrix …
GetSet, Netbee, .MOBI, Avenue Code, Lalubema, Stefanini …
Hobby desenvolvimento de jogos

3. Data Bind
O databind é uma maneira simples e robusta de ligar seus dados a UI sem precisar
utilizar aquela salada de código java para inserir ou ler dados das views.
Facilita testes de unitários em UI

4. public class Login {
private String email;
private String password;
}
...
EditText edtEmail = (EditText) findViewById(R.id.email);
EditText edtPassword = (EditText) findViewById(R.id.password);
...
login.setEmail(edtEmail.getText());
login.setPassword(edtPassword.getText());

5. Binding
ActivityLoginBinding binding = DataBindingUtil.setContentView(this,R.layout.activity_login);
Login login = new Login("rogerio.celestino@gmail.com","1234");
binding.setLoginview(login);

6. Setup
//<app-module>/build.gradle
apply plugin: "com.android.application"
android {
dataBinding {
enabled = true
}
}
}

7. Mudanças no layout
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout ...>
<AutoCompleteTextView
android:id="@+id/email" ../>
<EditText
android:id="@+id/password" .../>
</LinearLayout>
</layout>
res/layout/activity_login.xml
ActivityLoginBinding
activity_login.xml

8. ActivityLoginBinding binding = DataBindingUtil.setContentView(this,R.layout.activity_login);
binding.email.setText("rogerio.celestino@gmail.com");
Id da view
Good by FindViewByID :D
CamelCase/Nome
do layout

9. res/layout/activity_login.xml
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data class="LoginBinding">
...
</data>
LoginActivity.java
public class LoginActivity extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
...
LoginBinding binding = DataBindingUtil.setContentView(this,R.layout.activity_login);
…
}
…
}

10. Binding utils
DataBindingUtil.setContentView(activity, layoutId);
DataBindingUtil.inflate(inflater, layoutId, parent, attachToParrent);
ListItemBinding binding = ListItemBinding.bind(viewRoot);
Qualquer view
Activities
View já
prontas/inflated

11. Mapeando Objetos
public class Login {
private String email;
private String password;
}
...
EditText edtEmail = (EditText) findViewById(R.id.email);
EditText edtPassword = (EditText) findViewById(R.id.password);
...
login.setEmail(edtEmail.getText());
login.setPassword(edtPassword.getText());

12. Mapeando Objetos
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data class="LoginBinding">
<variable name="loginview"
type="com.rogerio.databindsample.model.Login"/>
</data>
<LinearLayout
<AutoCompleteTextView android:text="@{loginview.email}"../.>
<EditText android:text="@{loginview.password}" .../>
</LinearLayout>
</layout>

13. Mapeando Objetos
ActivityLoginBinding binding = DataBindingUtil.setContentView(this,R.layout.activity_login);
Login login = new Login("rogerio.celestino@mgail.com","1234");
binding.setLoginview(login);

14. Mão Dupla
public class ViewLogin extends BaseObservable {
Login login;
public ViewLogin(Login login) {
this.login = login;
}
@Bindable
public String getEmail() {
return login.getEmail();
}
public void setEmail(String email) {
login.setEmail(email);
notifyPropertyChanged(BR.email);
}
public void setPassword(String password) {
login.setPassword(password);
notifyPropertyChanged(BR.password);
}
@Bindable
public String getPassword(){
return login.getPassword();
}
}

15. Mapeando Objetos
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data class="LoginBinding">
<variable name="loginview"
type="com.rogerio.databindsample.model.view.ViewLogin"/>
</data>
<LinearLayout
<AutoCompleteTextView android:text="@={loginview.email}"../.>
<EditText android:text="@{loginview.password}" .../>
</LinearLayout>
</layout>

16. Referências
Dominando o Data Binding no Android
http://www.slideshare.net/nglauber/dominando-o-data-binding-no-android
Deep dive into Android Data Binding
http://www.slideshare.net/radekpiekarz/deep-dive-into-android-data-binding

17. Obrigado!
www.rogeriocs.com.br