Droidcon Paris 2015 feedback

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9-10 novembre 2015

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• Gradle build • Android performance matters • Ingredient for a healthy code base • Barcamp • Trending Android

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1. Initialization Choose project(s) to build 2. Configuration Execute build.gradle Build task graph 3. Execution Execute task chain

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Subject application: Google IO app • 28 libraries • 53149 method references

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• Configuration on Demand • Gradle Daemon • Newer versions of gradle • JVM 1.8 instead of 1.6 • Avoid expensive things during configuration phase • Don’t use dynamic dependencies (x.y.+)

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Package cost : 1.297s Resource change cost: 0.939s Jave change cost 4.462s • dex : 3.766s • Javac : 0.876s

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small project dev { multiDexEnabled true minSdkVersion 21 } 4.633 secs prod {} 6.599 secs Bigger prject dev { multiDexEnabled true minSdkVersion 21 } 4.416 secs prod { multiDexEnabled true minSdkVersion 15 } 20.703 secs

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Goals of a gradle plugin: • Create a gradle task that performs a custom task • Inject this task into the android task graph • Parametrize this task regarding the needs of the project • Package it and share it

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class MyCustomTask extends DefaultTask { @Input def String input; @Output def String output; @TaskAction def trigger() { // Do your stuff here } }

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public class MyPlugin implements Plugin { @Override void apply(Project project) { project.afterEvaluate ({ def myTask = project.tasks.create("mytask", MyCustomTask ); myTask.input = "doStuff" def jarTask = project.tasks.findByName("jar") jarTask.dependsOn(myTask); } }) }

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class MyTaskExtension { def String input = null; }

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public class MyPlugin implements Plugin { @Override void apply(Project project) { project.extensions.create("myExtension", MyTaskExtension) project.afterEvaluate ({ // ... myTask.input = project.myExtension.input // ... } }) }

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apply: "myPlugin" android { // ... } myExtension { input "doStuff" }

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• Static analysis tools – checkstyle – … • Google Play Store publishing • Groovy library for git • Dex count • Sqlite Analyzer Plugin • ...

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• Gradle performance: https://speakerdeck.com/madisp/squeezing- the-last-drop-of-performance-out-of-your-gradle-builds-droidcon- paris-2015 • Build your gradle plugin https://bit.ly/gradle-plugin-next-level • Improve android builds: https://speakerdeck.com/florianmski/level- up-your-android-build

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• Networking is the main battery consumer – Less radio time means less data – Batching to minimize radio transmission – Prefetching by predicting what the user will do

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• GC events eats your app framerate – Reduce images size – Use primitives instead of objects – Keep an eye on your memory with management tools (AllocationTracker, TraceView)

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• Create your own scrolling container – Movement tracking – Inertia scrolling – Scrollbars drawing – Edge detection to get feedback

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Performance Matter - Ran Nachmany, Google https://youtu.be/04igNM9IpwE?list=PLn7H9CUCuXAv_kAdS0rxL1_jdxXp FVb0r ViewGroups - François Blavoet, Deezer https://youtu.be/MSTG0JPOrYk?list=PLn7H9CUCuXAv_kAdS0rxL1_jdxX pFVb0r Advanced Scrolling - Cyril Mottier, Captain Train https://youtu.be/N3J4ZFiR_3Q?list=PLn7H9CUCuXAv_kAdS0rxL1_jdxX pFVb0r

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DATA LAYER DOMAIN LAYER PRESENTER LAYER

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Retrofit client DB client ArtistRepository • Shared preferences • ContentProvider • BDD

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• Orchestrates the flow of data with use “cases” • Offers its services to presentation layer • Pure Java module • No Android UI dependencies • No dependency to external source (db,content provider, shared preferences…)

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▸ public class Artist { String displayName; Date onTourUntil; String uri; String id; String url; String htmlUrl; String …; Object…; Object …; Object …; } public class ArtistViewModel { String name; boolean isOnTour; } VIEW MODEL PRESENTER VIEW

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public interface SearchPresenter { void searchUser(String searchItem); void clickUser(ArtistViewModel artist); } public interface SearchView { void showProgress(); void hideProgress(); void showUser(List artistes); } VIEW MODEL PRESENTER VIEW

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public class SearchFragment extends Fragment implements SearchView { private SearchPresenter searchPresenter; @Override public void showProgress() { //... } @Override public void hideProgress() { //... } @Override public void showUser(List users) { //... } }

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DATA LAYER DOMAIN LAYER PRESENTER LAYER OBSERVABLE OBSERVABLE SUBSCRIBER

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• Provides dependency: @Provides and @Module • Request dependency: @Inject • Link modules and injections: @Component • Implement the singleton pattern : @Singleton

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APPLICATION MODULE ACTIVITY MODULE FRAGMENT MODULE Repository Domain Activity Activity component Application component Presenter Use case

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DATA LAYER DOMAIN LAYER PRESENTER LAYER USER REPOSITORY SEARCH USED CASE SEARCH PRESENTER SEARCH FRAGMENT

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DATA LAYER DOMAIN LAYER PRESENTER LAYER .JSON

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• Choose an architecture and stick with it • Test while your code • Retrofit • Dagger 2 • Rx-java • Espresso • Junit

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• Clean Architecture : https://www.youtube.com/watch?v=- oZswd1j5H0 • Slide https://speakerdeck.com/romainpiel/ingredients-for-a-healthy- codebase • Presentation Dagger 2 : https://www.youtube.com/watch?v=IkTST564lA4 • slide Dagger 2 https://speakerdeck.com/jeremiemartinez/dagger-2- back-to-basics

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It’s a tool to : ▸ Enhance modularity ▸ Focus on business logic ▸ Reduce noise in the source code Occurs at compile time with byte code modification

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• To minimize the code necessary to bind your logic and your view • Still in Beta • Support library API 7

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public class User { public final String firstName; public final String lastName; public User (String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } }

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@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); MainActivityBinding binding = MainActivityBinding.inflate(getLayoutInflater()); User user = new User("Test", "User"); binding.setUser(user); }

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Le Data Binding sur Android - Guillaume Bernard, Koridev https://youtu.be/fG_93vUfm5s?list=PLn7H9CUCuXAv_kAdS0rxL1_jdxXpFV b0r Data Binding -- Write Apps Faster (Android Dev Summit 2015) https://youtu.be/NBbeQMOcnZ0

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• Android Emulator • Gives control on hardware features : – Control the battery level – GPS Location – Network and call management $

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• Jack & Jill • Kotlin • Eddystone

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Java Android Compiler Kit Jack Intermediate Library Linker Goal is to improve incremental build More efficient to compile compared to javac + dex, but still experimental

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The swift of Android ?

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Kotlin is compiled to Java bytecode Possibility to use both java and Kotlin in the same project

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Pros • Compile time detection of NPE with nullable type • Lambda • Type inference • Class extensions

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Cons • Overhead of 924 KB for runtime • Still in beta • Will it be adopted by the community ?

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Beacon • Autonomous • Cheap (15-20€) • Advertise data in a one way communication Eddystone Open beacon format

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3 possible messages with Eddystone • UID – Beacon broadcast its unique identifier • URL – Beacon broadcast – Physical web – Short range and contactless QRCode • TLM (Telemetry) – Maintenance (battery level, …)

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Evolution inside the android build system https://drive.google.com/file/d/0B1CCib0JzAOJRXZSY0c1ckZTU0E Kotlin for Android https://www.youtube.com/watch?v=50lASllvG3Q Eddystone https://www.youtube.com/watch?v=HR3X5h9xdno

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ANDROID STUDIO 2.0

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USABILITY (GUI) GPS POINTS KML BATTERY PHONE CALL SMS ROTATION RESIZE DRAG-DROP FINGERPRINT