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Android Jetpack
Acelerando el desarrollo de tus apps Android
Jorge Nogueiras
nogueirasjn
nogueiras
Fabio Negri
Fabio_negri
fabionegri
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• Acelera el desarrollo
• Elimina el código estándar
• Crea apps sólidas y de alta calidad
Ventajas
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Architecture
Behaviour
Foundation
UI
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Foundation
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Behaviour
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Architecture
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UI
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…
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fun navigateToNewGame() {
navigation.navigate(R.id.action_start_to_new_game)
}
navigation = Navigation.findNavController(view)
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, bundle
navigation.navigate(R.id.action_start_to_new_game
}
fun navigateToNewGame(attacker: User) {
navigation = Navigation.findNavController(view)
val bundle = bundleOf("user" to attacker)
)
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}
fun navigateToNewGame(attacker: User) {
navigation = Navigation.findNavController(view)
val action = LoginFragmentDirections.actionStartToNewGame(attacker)
navigation.navigate(action)
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}
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
}
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-keepnames class dev.nogueiras.presentation.User
@Keep data class User(username: String) : Serializable
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LiveData
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• Nuestra UI siempre actualizada
• Evita memory leaks y crashes
• Permite compartir recursos
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ViewModel
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• Mantiene el estado de la vista
• Bajo acoplamiento con la vista
• Sobrevive a cambios de configuración (ej: Rotación de pantalla)
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¿Cómo funciona el scope del ViewModel?
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Room
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Application
Data Access Objects
Room Database
Obtener DAOs
Leer Entidades
Persistir cambios
Entities
Leer/Guardar
campos
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Entities
@Entity(tableName = "users")
data class User(
val id: Long,
val name: String
)
@ColumnInfo(name = "id")
@ColumnInfo(name = "name")
@PrimaryKey
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Data Access Objects
interface UserDao {
fun getAll(): List
fun delete(user: User)
}
@Dao
@Query("SELECT * FROM users")
@Delete
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Room Database
@Database(
version = 1,
entities = [User::class]
)
abstract class AppDatabase : RoomDatabase() {
abstract fun userDao(): UserDao
}
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// 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
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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