Modern Android Development

Transcript

1. Nosakhare Belvi, Intelia @kingsmentor Uyo Modern Android Development
2. Old way New way #DevFest2018 Of Android development Transitioning from To
3. “10 years is long in computer science, it’s longer in mobile” - Romain Guy.
4. The last 10 Years - Logs #DevFest2018 • Eclipse. • Android 1.0 • ADT Plugin • Dalvik 2008 - 2013 • Android Studio • ART • Recycler View • Action bar 2014 - 2015 • Constraint Layout • Kotlin • Material design • Arch Components • Studio Profiler • Jet Pack • Android ktx Library • More wins with Android Studio 2016 - 2018 Ec i s a n t e Dal w o t ed m o y, no pe r ce Gra w i c b s o Al i t ti m n a s de pi n id s at re c o m l a p he . An o d di 1.0 ca t e s e Lot’s o t wi c o b im m at (ev ne ed s e l -Hol ) New wi R c l i w AR wi m op vi l ot of
5. #DevFest2018 Tools
6. View Hierarchy Layout Inspector • Very useful to debug layout • Connects to your application to show the tree of all your views • Ugly • Hard to use • Very Slow (takes time to dump the view tree from the application) • Not integrated into the IDE • Integrated to Android Studio • View dumps can be saved to viewed later • Super fast • Provides same functionality as in View Hierarchy Tools Layout Inspector Ver p an d u g y u p o t to re ad s .
9. Traceview Android Profiler and Systrace Profile your code with : • Graphical representation of trace logs • Shows methods executed and time spent in execution) • Hard to use and Navigate • Completely wrong code profiling • Not integrated into the IDE • Kinda profile misleading information by reusing threads ids (a dead thread id can be reassigned) • Limited data and insight • Separate tool used for memory allocation tracking (DDMS) • Real-time data to help understand CPU, Memory, Network, battery resources • Systrace is a system-wide profiler (Combines data from Android kernel, CPU, app thread). It gives a deeper insight • Generate html report that can be exported in case of testing Sup po n ol m ov t pe r ce ur n he n r me y a s e
12. Old Layout Design Constraint Layout • UI’s designed with Xml • Quite Simple to use • Complex to manage as project grows bigger • You need to know the right views/view group to use • Visual Design tool. Build with little or no knowledge of xml. • Blueprint mode shows more information about the design system • Faster UI Loading (views are not so nested) • Smoother animation amongst child views
15. #DevFest2018 Language
16. Java Kotlin • Popular • Great Tool • Slow Adoption of new versions • Be ready for null pointers on productions • Official support in 2017 • Close collaboration with Jetbrains • Many great features that makes code more enjoyable to write and read • Android ktx library is powerful • Impressive support for lambdas, coroutine • Perfect with reactive programing • Helpful code optimisation on Android studio
17. // assuming sharedPreference is nullable Java: if(sharedPreferences != null){ sharedPreferences.edit(); sharedPreferences.putBoolean("key", value); sharedPreferences.apply(); } Kotlin: sharedPreferences?.edit() ?.putBoolean("key", value) ?.apply() Kotlin with Android KTX: sharedPreferences?.edit { putBoolean("key", value) }
18. Interesting things to Note #DevFest2018 • Android projects can contain both Kotlin & Java source • Android Studio can easily convert Java codes to Kotlin for you • Be careful with extension usage (Cost might be expensive!). See Android Ktx for Guide • Style Guide (Learn best coding practices in kotlin) • Interop guide (So your tool can be used by all. )
19. #DevFest2018 Libraries and APIs
20. AbsoluteLayout LinearLayout FrameLayout GridLayout RelativeLayout Layouts Eas ! In i t ne d (ca d o pe r ce es ! ) Jus ! Pre y C l . Who t i t h ? Rel el E pe v AbsoluteLayout (Don’t try this at home) LinearLayout FrameLayout GridLayout (Discover Recycler and leave the past) RelativeLayout ConstraintLayout 2.0
21. Listview GridView Gallery Used for display of collection of items AdapterViews RecyclerView BaseAdapters / CursorAdapter • Managing data change was expensive / difficult • Animating items didn’t come easy (pretty complex) • GridView Was really complicated to us • ViewHolder Performance issues. (Plu yo t a t e r u w t al s) Collections view done right ! • Same Data, different layout manager • Smoother UI Transaction • SortedList built specially to handle datachange • DiffUtil built specially to handle data change and transition. • Understands animation out of the box notifyItemRemoved(0);
22. #DevFest2018 Jet Pack
23. #DevFest2018
24. • Collection of Android Components to make building Android Apps Easier • Make following best practices obtainable • Avoid boilerplate code • Simplify dev processes, tasks so you focus on your code Why JetPack Core JetPack Components • Foundation • Architecture • Behavior • UI Can be used independently and work together
25. Recommended Architecture (MVVM)- JetPack Aftermath #DevFest2018
26. #DevFest2018 What does 10 years of Progress Look Like ?
27. Eas Sim c
28. #DevFest2018 Build Time
29. Worthy of Note : Gradle build time has incredibly increased. Want something faster ? Try Bucks !
30. Best Coding Practices #DevFest2018 • Avoid work when possible ◦ Use recommended libraries (also contribute) • Profile your code • Use Support Libraries Features • Minimize memory consumption Al a s R be • Dev ar o r -co t ed • Bat y e s ti • Ban d s ec u • Use p i c a t
31. Catching up with Android Trends #DevFest2018 • Follow the right people on twitter (especially experts like Jake Wharton, Romain Guy, Ian Lake, Chris Bane) • Android developer blog • Android developer site • Android Weekly • Watch talks from Google.io (If you weren’t invited or can’t afford to go) • Follow Android Developer Channel on Youtube • Android dev summit (livestream or watch videos after summit) • Popular Github repo or projects from rockstar devs on Android. • Blogs of Android dev Experts e.g ProAndroidDev, castle.io
32. Helpful Resources #DevFest2018 • https://www.youtube.com/watch?v=IrMw7MEgADk • https://www.youtube.com/watch?v=iDH84_OMPmw • https://www.youtube.com/watch?v=7p22cSzniBM • https://proandroiddev.com/mvvm-architecture-viewmodel-and-livedata-part-1-604f50cda1 • https://developer.android.com/studio/profile/android-profiler?gclid=CjwKCAiAiarfBRASEiwAw1tYv-z3dH8CMm C7c0AErrP_CgXoATVDI8HC8rtmwmsiXYfwlt29gwMLsBoC6nMQAvD_BwE • https://developer.android.com/jetpack/ • https://developer.android.com/topic/libraries/architecture/ • https://www.youtube.com/watch?v=7ll-rkLCtyk • https://github.com/uber/okbuck
33. Nosakhare Belvi, Intelia @kingsmentor Uyo Thank you!