Android Jetpack

Breve introducción a Android Jetpack y presentación de algunos Architecture Components y cómo los combinamos para potenciar nuestro desarrollo de aplicaciones.
Presentación en el marco del DevFest Buenos Aires 2019 , llevado a cabo en La Universidad Nacional de La Matanza

Transcript

1. Android Jetpack Acelerando el desarrollo de tus apps Android Jorge Nogueiras nogueirasjn nogueiras Fabio Negri Fabio_negri fabionegri
4. • Acelera el desarrollo • Elimina el código estándar • Crea apps sólidas y de alta calidad Ventajas
5. Architecture Behaviour Foundation UI
6. Foundation
7. Behaviour
8. Architecture
9. UI
12. <navigation xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools=“http://schemas.android.com/tools" android:id=“@+id/main_navigation_graph" app:startDestination=“@id/startFragment"> … </fragment> </navigation> <fragment android:id="@+id/startFragment" android:name="dev.nogueiras.navigation.StartFragment" android:label=“fragment_start" tools:layout="@layout/fragment_start"> <action android:id=“@+id/action_start_to_leaderboard" app:destination=“@id/leader_board_fragment”/> <action android:id=“@+id/action_start_to_new_game" app:destination=“@id/new_game_fragment”/> </fragment> <fragment android:id=“@+id/leader_board_fragment" android:name="dev.nogueiras.navigation.LeaderboardFragment" android:label=“fragment_leader_board" tools:layout=“@layout/fragment_leaderboard">
13. <fragment android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:defaultNavHost="true" app:navGraph="@navigation/main_navigation_graph"/> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=“.presentation.StartActivity"> </androidx.constraintlayout.widget.ConstraintLayout>
15. fun navigateToNewGame() { navigation.navigate(R.id.action_start_to_new_game) } navigation = Navigation.findNavController(view)
16. , bundle navigation.navigate(R.id.action_start_to_new_game } fun navigateToNewGame(attacker: User) { navigation = Navigation.findNavController(view) val bundle = bundleOf("user" to attacker) )
18. <fragment android:id=“@+id/new_game_fragment” android:name="dev.nogueiras.navigation.NewGameFragment" android:label=“fragment_new_game” tools:layout=“@layout/fragment_new_game”> <argument android:name="user" app:argType=“dev.nogueiras.presentation.User"/> </fragment>
19. } fun navigateToNewGame(attacker: User) { navigation = Navigation.findNavController(view) val action = LoginFragmentDirections.actionStartToNewGame(attacker) navigation.navigate(action)
20. } fun navigateToNewGame(attacker: User) { navigation = Navigation.findNavController(view) val action = LoginFragmentDirections.actionStartToNewGame(attacker) navigation.navigate(action) intent?.extras?.let { val arguments = NewGameFragmentArgs.fromBundle(it) userLabel.text = arguments.user.username }
21. -keepnames class dev.nogueiras.presentation.User @Keep data class User(username: String) : Serializable
22. LiveData
23. • Nuestra UI siempre actualizada • Evita memory leaks y crashes • Permite compartir recursos
24. ViewModel
25. • Mantiene el estado de la vista • Bajo acoplamiento con la vista • Sobrevive a cambios de configuración (ej: Rotación de pantalla)
26. ¿Cómo funciona el scope del ViewModel?
27. Room
28. Application Data Access Objects Room Database Obtener DAOs Leer Entidades Persistir cambios Entities Leer/Guardar campos
29. Entities @Entity(tableName = "users") data class User( val id: Long, val name: String ) @ColumnInfo(name = "id") @ColumnInfo(name = "name") @PrimaryKey
30. Data Access Objects interface UserDao { fun getAll(): List<User> fun delete(user: User) } @Dao @Query("SELECT * FROM users") @Delete
31. Room Database @Database( version = 1, entities = [User::class] ) abstract class AppDatabase : RoomDatabase() { abstract fun userDao(): UserDao }
32. // Ejecuto operación val allUsers = userDao.getAll() // Obtengo DAO val userDao = database.userDao() // Obtengo la base de datos val database = Room.databaseBuilder( applicationContext, AppDatabase::class.java, "trivia-game-db" ).build() Application
37. http://developer.android.com/jetpack https://github.com/nogueirasjorge/navigation-example https://codelabs.developers.google.com/codelabs/android-navigation/ https://codelabs.developers.google.com/codelabs/android-room-with-a-view-kotlin/ https://android.googlesource.com/platform/frameworks/support/+/androidx-master-dev