Whats new in Android

Transcript

1. WHAT’S HOT IN GDG Malta Danny Preussler @PreusslerBerlin

2. WHO’S THAT GERMAN?

3. WHAT’S A DEVELOPER EXPERT?

4. WHAT’S A DEVELOPER EXPERT?

5. 2009 ANDROID

6. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava

7. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava

8. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava

9. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava

10. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava

11. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava

12. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava ViewModel View

13. DATA BINDING

14. SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava

15. RXJAVA tasksRepository.getTasks() .flatMap(Flowable::fromIterable) .filter(task -> { switch (currentFiltering) { case

    ACTIVE_TASKS: return task.isActive(); case COMPLETED_TASKS: return task.isCompleted(); case ALL_TASKS: default return true; } }) * https://github.com/googlesamples/android-architecture

16. WHAT WAS NEW IN 2017

17. NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps

18. • Picture in Picture • Resizable TextView • Fonts in

    xml and Downloadable fonts • Notification changes • Background changes • Instant Apps

19. NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps

20. NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps

21. NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps

22. NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps

23. BACKGROUND CHANGES • Doze and JobScheduler started with M (Android

    6) • New background limitations

24. NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes •Instant apps

25. INSTANT APPS • “say no to app downloads” • (partial)

    app starts directly from website • Split up your app into feature modules

26. NEWS IN ARCHITECTURE • Architecture blueprints • Architecture guidelines •

    Architecture components

27. NEWS IN ARCHITECTURE •Architecture blueprints github.com/googlesamples/android-architecture • Architecture guidelines •

    Architecture components

28. NEWS IN ARCHITECTURE • Architecture blueprints •Architecture guidelines developer.android.com/topic/libraries/architecture/guide.html •

    Architecture components

29. NEWS IN ARCHITECTURE • Architecture blueprints •Architecture guidelines • Architecture

    components
30. None

31. NEWS IN ARCHITECTURE • Architecture blueprints • Architecture guidelines •Architecture

    components developer.android.com/topic/libraries/architecture/index.html

32. ARCHITECTURE COMPONENTS • Viewmodel • LiveData • LifeCycleObserver • Room

    • Pagination

33. VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change

34. VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change

35. VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change Model ViewModel View

36. VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change

37. VIEWMODEL public void onCreate(...) { model = ViewModelProviders .of(this) .get(MyViewModel.class);

    } class MyViewModel extends ViewModel { …

38. VIEWMODEL LIVES LONGER! Activity Activity ViewModel

39. INTRODUCING LIVE DATA Activity Activity LiveData LiveData ViewModel

40. LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save

41. LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save

42. LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save

43. LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save

44. LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save

45. LIVE DATA class MyViewModel extends ViewModel { MutableLiveData<String> message =

    new MutableLiveData<String>(); myModel.message.observe(this, new Observer<String>() { @Override public void onChanged(String newValue) {..} }

46. LIFECYCLEOBSERVER • Helps building your own life cycle aware components

    • Watch Activity, Fragment or Application life cycle • Avoid memory leaks • Avoid forwarding events from activities/fragments • Introduces ProcessLifeCycle!

47. ROOM • SQLite Object Mapper • Compile time check •

    Works with RxJava

48. ROOM @Dao abstract class ConferenceStore { @Insert abstract void insert(List<Session>

    sessions); @Query("SELECT * FROM tracks") abstract List<Track> allTracks(); ... https://commonsware.com/presos/2017-11-Room

49. ROOM @Entity(tableName = "tracks") class Track { @PrimaryKey(autoGenerate = true)

    final Long id; @NonNull final String title; @NonNull final String location; ... https://commonsware.com/presos/2017-11-Room

50. ROOM @Database(version=1, entities = {Track.class, Session.class}) abstract public class ConferenceDatabase

    extends RoomDatabase { https://commonsware.com/presos/2017-11-Room

51. A NEW PROGRAMMING LANGUAGE * Java still fully supported on

    Android

52. KOTLIN • Modern language • Reduce boilerplate • null safe

    • New possibilies • Communication with swift devs • Works great with Java • Multiplatform with web and backend

53. KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend

54. KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend

55. fun isEligibleToVote(): Boolean { return age >= 18 }

56. fun isEligibleToVote = age >= 18

57. data class MyModel(val lastName: String, val name: String = “”)

58. ... Map<TYPE, Integer> signalStrength = new HashMap<>(); signalStrength.put(EDGE, 80); signalStrength.put(WIFI

    to 90); ...

59. ... val signalStrength = hashMapOf(EDGE to 80, WIFI to 90)

    ...

60. class MyViewModel extends ViewModel { MutableLiveData<String> message = new MutableLiveData<String>();

    myModel.message.observe(this, new Observer<String>() { @Override public void onChanged(String newName) {..} }

61. class MyViewModel(): ViewModel(){ val message = MutableLiveData<String>() myModel.message.observe(this, Observer{ ..

    })}

62. KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend

63. NULL SAFETY var canNeverBeNull: String var canBeNull: String?

64. if (subscription != null) { subscription.dispose() }

65. subscription?.dispose()

66. KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilities • Communication with swift devs • Multiplatform with web and backend

67. val typeOfPerson = when(age){ 0 -> "New born" in 1..12

    -> "Child" in 13..19 -> "Teenager" else -> "Adult" }

68. fun String.toAspectRatio(): AspectRatio? = when (this) { "1:1" -> ONE_BY_ONE

    "2:3" -> TWO_BY_THREE else -> null }

69. fun Int.clamp(lower: Int, upper: Int) = Math.max(lower, Math.min(this, upper)) progress.clamp(0,

    100)

70. greeting shouldEqual "hello"

71. greeting.shouldEqual("hello”)

72. greeting shouldEqual "hello"

73. greeting `should equal` "hello"

74. KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilities • Communication with swift devs • Multiplatform with web and backend

75. KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilities • Communication with swift devs • Multiplatform with web and backend support for JVM, JS, native

76. KOTLIN = fun

77. None

78. SUMMARIZE It was never so easy to start with Android

79. WRITE ANDROID IN

80. ANDROID IS MORE THAN PHONE

81. None

82. WHAT’S HOT IN GDG Malta Danny Preussler @PreusslerBerlin