Whats new in Android

Transcript

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   WHAT’S HOT IN GDG Malta Danny Preussler @PreusslerBerlin

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   WHO’S THAT GERMAN?

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   WHAT’S A DEVELOPER EXPERT?

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   WHAT’S A DEVELOPER EXPERT?

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   2009 ANDROID

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   SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava
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   SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava
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   SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava
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   SOOO 2016 • Material Design • Firebase • ConstraintLayout •

   Databinding • RxJava
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    SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava
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    SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava
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    SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava ViewModel View
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    DATA BINDING

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    SOOO 2016 • Material Design • Firebase • ConstraintLayout •

    Databinding • RxJava
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    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
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    WHAT WAS NEW IN 2017

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    NEW FEATURE IN ANDROID 8 • Picture in Picture •

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

    xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
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    NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
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    NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
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    NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
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    NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
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    BACKGROUND CHANGES • Doze and JobScheduler started with M (Android

    6) • New background limitations
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    NEW FEATURE IN ANDROID 8 • Picture in Picture •

    Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes •Instant apps
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    INSTANT APPS • “say no to app downloads” • (partial)

    app starts directly from website • Split up your app into feature modules
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    NEWS IN ARCHITECTURE • Architecture blueprints • Architecture guidelines •

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

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

    Architecture components
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    NEWS IN ARCHITECTURE • Architecture blueprints •Architecture guidelines • Architecture

    components
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    None
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    NEWS IN ARCHITECTURE • Architecture blueprints • Architecture guidelines •Architecture

    components developer.android.com/topic/libraries/architecture/index.html
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    ARCHITECTURE COMPONENTS • Viewmodel • LiveData • LifeCycleObserver • Room

    • Pagination
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    VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change
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    VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change
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    VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change Model ViewModel View
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    VIEWMODEL • provides the data for a specific UI •

    fits great into MVVM • survives configuration change
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    VIEWMODEL public void onCreate(...) { model = ViewModelProviders .of(this) .get(MyViewModel.class);

    } class MyViewModel extends ViewModel { …
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    VIEWMODEL LIVES LONGER! Activity Activity ViewModel

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    INTRODUCING LIVE DATA Activity Activity LiveData LiveData ViewModel

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    LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save
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    LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save
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    LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save
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    LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save
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    LIVE DATA • Observable similar to RxJava • Life cycle

    aware • Doesn’t emit when not needed • Memory leak save
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    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) {..} }
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    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!
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    ROOM • SQLite Object Mapper • Compile time check •

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

    extends RoomDatabase { https://commonsware.com/presos/2017-11-Room
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    A NEW PROGRAMMING LANGUAGE * Java still fully supported on

    Android
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    KOTLIN • Modern language • Reduce boilerplate • null safe

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

    Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend
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    KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend
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    fun isEligibleToVote(): Boolean { return age >= 18 }

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    fun isEligibleToVote = age >= 18

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

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

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

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

    myModel.message.observe(this, new Observer<String>() { @Override public void onChanged(String newName) {..} }
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    class MyViewModel(): ViewModel(){ val message = MutableLiveData<String>() myModel.message.observe(this, Observer{ ..

    })}
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    KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend
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    NULL SAFETY var canNeverBeNull: String var canBeNull: String?

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

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    subscription?.dispose()

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    KOTLIN • Modern language • Works great with Java •

    Reduce boilerplate • null safe • New possibilities • Communication with swift devs • Multiplatform with web and backend
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    val typeOfPerson = when(age){ 0 -> "New born" in 1..12

    -> "Child" in 13..19 -> "Teenager" else -> "Adult" }
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    fun String.toAspectRatio(): AspectRatio? = when (this) { "1:1" -> ONE_BY_ONE

    "2:3" -> TWO_BY_THREE else -> null }
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    fun Int.clamp(lower: Int, upper: Int) = Math.max(lower, Math.min(this, upper)) progress.clamp(0,

    100)
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    greeting shouldEqual "hello"

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    greeting.shouldEqual("hello”)

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    greeting shouldEqual "hello"

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    greeting `should equal` "hello"

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    KOTLIN • Modern language • Works great with Java •

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

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    None
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    SUMMARIZE It was never so easy to start with Android

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    WRITE ANDROID IN

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    ANDROID IS MORE THAN PHONE

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    None
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    WHAT’S HOT IN GDG Malta Danny Preussler @PreusslerBerlin