Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Whats new in Android
Search
Danny Preussler
November 17, 2017
Programming
1
83
Whats new in Android
Lecture at University of malta as part of DevFest Malta
Danny Preussler
November 17, 2017
Tweet
Share
More Decks by Danny Preussler
See All by Danny Preussler
Testing, how hard can it be? (Droidcon Lisbon 2022)
dpreussler
3
490
Take your Kotlin to the next step, abandon what you’ve learned (in Java)
dpreussler
0
670
The Power of Types, KotlinConf 2019
dpreussler
7
1.3k
Java vs Kotlin
dpreussler
0
440
Property Delegation with Kotlin for Android
dpreussler
1
130
Java vs Kotlin
dpreussler
2
450
To inject or not to inject: Dependency Injection with Kotlin (Droidcon Nairobi)
dpreussler
4
270
TDD on Android
dpreussler
4
380
To Inject or not inject, Dependency Injection in a Kotlin world (appbuilders.ch 2018)
dpreussler
10
4.8k
Other Decks in Programming
See All in Programming
CSC305 Lecture 04
javiergs
PRO
0
270
One Enishi After Another
snoozer05
PRO
0
110
コードとあなたと私の距離 / The Distance Between Code, You, and I
hiro_y
0
170
NixOS + Kubernetesで構築する自宅サーバーのすべて
ichi_h3
0
1k
Le côté obscur des IA génératives
pascallemerrer
0
150
Six and a half ridiculous things to do with Quarkus
hollycummins
0
180
いま中途半端なSwift 6対応をするより、Default ActorやApproachable Concurrencyを有効にしてからでいいんじゃない?
yimajo
2
440
品質ワークショップをやってみた
nealle
0
520
テーブル定義書の構造化抽出して、生成AIでDWH分析を試してみた / devio2025tokyo
kasacchiful
0
150
CSC305 Lecture 06
javiergs
PRO
0
250
Devoxx BE - Local Development in the AI Era
kdubois
0
130
iOSエンジニア向けの英語学習アプリを作る!
yukawashouhei
0
200
Featured
See All Featured
Measuring & Analyzing Core Web Vitals
bluesmoon
9
620
Faster Mobile Websites
deanohume
310
31k
Rebuilding a faster, lazier Slack
samanthasiow
84
9.2k
We Have a Design System, Now What?
morganepeng
53
7.8k
How to train your dragon (web standard)
notwaldorf
97
6.3k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
The Language of Interfaces
destraynor
162
25k
Statistics for Hackers
jakevdp
799
220k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
55
3k
GitHub's CSS Performance
jonrohan
1032
470k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
Building Applications with DynamoDB
mza
96
6.7k
Transcript
WHAT’S HOT IN GDG Malta Danny Preussler @PreusslerBerlin
WHO’S THAT GERMAN?
WHAT’S A DEVELOPER EXPERT?
WHAT’S A DEVELOPER EXPERT?
2009 ANDROID
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava ViewModel View
DATA BINDING
SOOO 2016 • Material Design • Firebase • ConstraintLayout •
Databinding • RxJava
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
WHAT WAS NEW IN 2017
NEW FEATURE IN ANDROID 8 • Picture in Picture •
Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
• Picture in Picture • Resizable TextView • Fonts in
xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
NEW FEATURE IN ANDROID 8 • Picture in Picture •
Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
NEW FEATURE IN ANDROID 8 • Picture in Picture •
Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
NEW FEATURE IN ANDROID 8 • Picture in Picture •
Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
NEW FEATURE IN ANDROID 8 • Picture in Picture •
Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes • Instant Apps
BACKGROUND CHANGES • Doze and JobScheduler started with M (Android
6) • New background limitations
NEW FEATURE IN ANDROID 8 • Picture in Picture •
Resizable TextView • Fonts in xml and Downloadable fonts • Notification changes • Background changes •Instant apps
INSTANT APPS • “say no to app downloads” • (partial)
app starts directly from website • Split up your app into feature modules
NEWS IN ARCHITECTURE • Architecture blueprints • Architecture guidelines •
Architecture components
NEWS IN ARCHITECTURE •Architecture blueprints github.com/googlesamples/android-architecture • Architecture guidelines •
Architecture components
NEWS IN ARCHITECTURE • Architecture blueprints •Architecture guidelines developer.android.com/topic/libraries/architecture/guide.html •
Architecture components
NEWS IN ARCHITECTURE • Architecture blueprints •Architecture guidelines • Architecture
components
None
NEWS IN ARCHITECTURE • Architecture blueprints • Architecture guidelines •Architecture
components developer.android.com/topic/libraries/architecture/index.html
ARCHITECTURE COMPONENTS • Viewmodel • LiveData • LifeCycleObserver • Room
• Pagination
VIEWMODEL • provides the data for a specific UI •
fits great into MVVM • survives configuration change
VIEWMODEL • provides the data for a specific UI •
fits great into MVVM • survives configuration change
VIEWMODEL • provides the data for a specific UI •
fits great into MVVM • survives configuration change Model ViewModel View
VIEWMODEL • provides the data for a specific UI •
fits great into MVVM • survives configuration change
VIEWMODEL public void onCreate(...) { model = ViewModelProviders .of(this) .get(MyViewModel.class);
} class MyViewModel extends ViewModel { …
VIEWMODEL LIVES LONGER! Activity Activity ViewModel
INTRODUCING LIVE DATA Activity Activity LiveData LiveData ViewModel
LIVE DATA • Observable similar to RxJava • Life cycle
aware • Doesn’t emit when not needed • Memory leak save
LIVE DATA • Observable similar to RxJava • Life cycle
aware • Doesn’t emit when not needed • Memory leak save
LIVE DATA • Observable similar to RxJava • Life cycle
aware • Doesn’t emit when not needed • Memory leak save
LIVE DATA • Observable similar to RxJava • Life cycle
aware • Doesn’t emit when not needed • Memory leak save
LIVE DATA • Observable similar to RxJava • Life cycle
aware • Doesn’t emit when not needed • Memory leak save
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) {..} }
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!
ROOM • SQLite Object Mapper • Compile time check •
Works with RxJava
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
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
ROOM @Database(version=1, entities = {Track.class, Session.class}) abstract public class ConferenceDatabase
extends RoomDatabase { https://commonsware.com/presos/2017-11-Room
A NEW PROGRAMMING LANGUAGE * Java still fully supported on
Android
KOTLIN • Modern language • Reduce boilerplate • null safe
• New possibilies • Communication with swift devs • Works great with Java • Multiplatform with web and backend
KOTLIN • Modern language • Works great with Java •
Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend
KOTLIN • Modern language • Works great with Java •
Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend
fun isEligibleToVote(): Boolean { return age >= 18 }
fun isEligibleToVote = age >= 18
data class MyModel(val lastName: String, val name: String = “”)
... Map<TYPE, Integer> signalStrength = new HashMap<>(); signalStrength.put(EDGE, 80); signalStrength.put(WIFI
to 90); ...
... val signalStrength = hashMapOf(EDGE to 80, WIFI to 90)
...
class MyViewModel extends ViewModel { MutableLiveData<String> message = new MutableLiveData<String>();
myModel.message.observe(this, new Observer<String>() { @Override public void onChanged(String newName) {..} }
class MyViewModel(): ViewModel(){ val message = MutableLiveData<String>() myModel.message.observe(this, Observer{ ..
})}
KOTLIN • Modern language • Works great with Java •
Reduce boilerplate • null safe • New possibilies • Communication with swift devs • Multiplatform with web and backend
NULL SAFETY var canNeverBeNull: String var canBeNull: String?
if (subscription != null) { subscription.dispose() }
subscription?.dispose()
KOTLIN • Modern language • Works great with Java •
Reduce boilerplate • null safe • New possibilities • Communication with swift devs • Multiplatform with web and backend
val typeOfPerson = when(age){ 0 -> "New born" in 1..12
-> "Child" in 13..19 -> "Teenager" else -> "Adult" }
fun String.toAspectRatio(): AspectRatio? = when (this) { "1:1" -> ONE_BY_ONE
"2:3" -> TWO_BY_THREE else -> null }
fun Int.clamp(lower: Int, upper: Int) = Math.max(lower, Math.min(this, upper)) progress.clamp(0,
100)
greeting shouldEqual "hello"
greeting.shouldEqual("hello”)
greeting shouldEqual "hello"
greeting `should equal` "hello"
KOTLIN • Modern language • Works great with Java •
Reduce boilerplate • null safe • New possibilities • Communication with swift devs • Multiplatform with web and backend
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
KOTLIN = fun
None
SUMMARIZE It was never so easy to start with Android
WRITE ANDROID IN
ANDROID IS MORE THAN PHONE
None
WHAT’S HOT IN GDG Malta Danny Preussler @PreusslerBerlin