Droidcon Paris 2015 feedback

Transcript

1. 9-10 novembre 2015
2. • Gradle build • Android performance matters • Ingredient for a healthy code base • Barcamp • Trending Android
4. 1. Initialization Choose project(s) to build 2. Configuration Execute build.gradle Build task graph 3. Execution Execute task chain
5. Subject application: Google IO app • 28 libraries • 53149 method references
6. • 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.+)
8. Package cost : 1.297s Resource change cost: 0.939s Jave change cost 4.462s • dex : 3.766s • Javac : 0.876s
9. 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
10. 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
11. class MyCustomTask extends DefaultTask { @Input def String input; @Output def String output; @TaskAction def trigger() { // Do your stuff here } }
12. public class MyPlugin implements Plugin<Project> { @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); } }) }
13. class MyTaskExtension { def String input = null; }
14. public class MyPlugin implements Plugin<Project> { @Override void apply(Project project) { project.extensions.create("myExtension", MyTaskExtension) project.afterEvaluate ({ // ... myTask.input = project.myExtension.input // ... } }) }
15. apply: "myPlugin" android { // ... } myExtension { input "doStuff" }
18. • Static analysis tools – checkstyle – … • Google Play Store publishing • Groovy library for git • Dex count • Sqlite Analyzer Plugin • ...
19. • 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
21. • 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
22. • 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)
23. <RelativeLayout> <ImageView/> <LinearLayout> <TextView/> <TextView/> </LinearLayout> <ImageView/> <ImageView/> </RelativeLayout> <merge> <ImageView/> <TextView/> <TextView/> <ImageView/> <ImageView/> </merge> ->
24. • Create your own scrolling container – Movement tracking – Inertia scrolling – Scrollbars drawing – Edge detection to get feedback
25. 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
28. DATA LAYER DOMAIN LAYER PRESENTER LAYER
29. Retrofit client DB client ArtistRepository • Shared preferences • ContentProvider • BDD
30. • 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…)
31. ▸ 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
32. public interface SearchPresenter { void searchUser(String searchItem); void clickUser(ArtistViewModel artist); } public interface SearchView { void showProgress(); void hideProgress(); void showUser(List<ArtistViewModel> artistes); } VIEW MODEL PRESENTER VIEW
33. public class SearchFragment extends Fragment implements SearchView { private SearchPresenter searchPresenter; @Override public void showProgress() { //... } @Override public void hideProgress() { //... } @Override public void showUser(List<UserViewModel> users) { //... } }
34. DATA LAYER DOMAIN LAYER PRESENTER LAYER OBSERVABLE<MODEL> OBSERVABLE<VIEWMODEL> SUBSCRIBER<VIEWMODEL>
35. • Provides dependency: @Provides and @Module • Request dependency: @Inject • Link modules and injections: @Component • Implement the singleton pattern : @Singleton
36. APPLICATION MODULE ACTIVITY MODULE FRAGMENT MODULE Repository Domain Activity Activity component Application component Presenter Use case
37. DATA LAYER DOMAIN LAYER PRESENTER LAYER USER REPOSITORY SEARCH USED CASE SEARCH PRESENTER SEARCH FRAGMENT
38. DATA LAYER DOMAIN LAYER PRESENTER LAYER .JSON
39. • Choose an architecture and stick with it • Test while your code • Retrofit • Dagger 2 • Rx-java • Espresso • Junit
40. • 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
41. 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
45. • To minimize the code necessary to bind your logic and your view • Still in Beta • Support library API 7
46. <data> <variable name="user" type="com.example.User"/> </data> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@{user.firstName}” />
47. public class User { public final String firstName; public final String lastName; public User (String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } }
48. @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); MainActivityBinding binding = MainActivityBinding.inflate(getLayoutInflater()); User user = new User("Test", "User"); binding.setUser(user); }
49. 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
50. • Android Emulator • Gives control on hardware features : – Control the battery level – GPS Location – Network and call management $
52. • Jack & Jill • Kotlin • Eddystone
53. 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
55. The swift of Android ?
56. Kotlin is compiled to Java bytecode Possibility to use both java and Kotlin in the same project
57. Pros • Compile time detection of NPE with nullable type • Lambda • Type inference • Class extensions
58. Cons • Overhead of 924 KB for runtime • Still in beta • Will it be adopted by the community ?
59. Beacon • Autonomous • Cheap (15-20€) • Advertise data in a one way communication Eddystone Open beacon format
60. 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, …)
62. 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
64. ANDROID STUDIO 2.0
65. USABILITY (GUI) GPS POINTS KML BATTERY PHONE CALL SMS ROTATION RESIZE DRAG-DROP FINGERPRINT