Modern, maintainable and coRRRect project

Each day our software projects become more and more complex. It may because of changes introduced into the Android platform, some external ecosystem change, or the developer community that just discovered a better solution for an existing problem. On top of that our application is constantly evolving driven by a stream of new business requirements. In this dynamic environment, we have to guarantee not only protection about regressions but also high code quality. Let's take a look at various ways of improving and verifying the Android projects and ways to integrate these tools into the modern software development life cycle.

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1. Modern, maintainable and coRRRect project 1
2. 2 Hello! I AM IGOR WOJDA Android Developer Advocate, Vonage @igorwojda
3. BECOMING A DEVELOPER Day 0: ◦First “Hello, World” program ◦First variable ◦First method ◦First class ◦First module ◦... 3
4. Why does developing quality software take time?
5. COMPLEXITY 5
6. APPLICATION COMPLEXITY 6 1a
7. INPUT COMBINATIONS 7 72 characters ◦ a-z - 26 characters ◦ A-Z - 26 characters ◦ 0-9 - 10 characters ◦ !&# - 10 characters
8. INPUT COMBINATIONS 8 1 character 72 permutations a
9. INPUT COMBINATIONS 9 2 characters 5184 permutations ab
10. INPUT COMBINATIONS 10 3 characters 373248 permutations abc
11. SIMPLE VALIDATION 11
12. COMPLEX VALIDATION 12 Email validation regular expression: Works 99.99% of times
13. SOFTWARE PROJECT COMPLEXITY 13 1b
14. BIG PICTURE 14 Correctness Code style Accessibility Frameworks & libraries Programming languages Build scripts Data Storage Version control Networking Documentation UI/UX Android versions Devices Architecture Issue trackers Code quality Terminal IDE & Plugins Soft Skills Releases Security
15. CHANGE
16. DEALING WITH COMPLEXITY 16 2
17. IDE CODE HINTS 17
18. LINTERS 18 2a
19. LINTERS 19 App source files Result Lint tool
20. ANDROID LINT 20
21. KTLINT & CHECKSTYLE ◦Ktlint + ktlint-gradle (Kotlin) ◦Checkstyle (Java) 21 Ok Missing space
22. DETEKT Too many parameters in the constructor 22
23. SPELLCHECKER coRRRect 23 Typo
24. ONLINE TOOLS ◦Codacy ◦CodeFactor ◦CodeBeat 24
25. TESTS 25 3
26. ANDROID TEST PYRAMID 26
27. ALTERNATIVE TEST CLASSIFICATION 27
28. Gradle Plugins 28 4
29. GRADLE PLAY PUBLISHER ./gradlew publishApk 29
30. GRADLE DEPENDENCY LOCK PLUGIN implementation 'com.nexmo.android:client-sdk:2.7.+' 30 Dynamic dependency major.minor.patch implementation 'com.nexmo.android:client-sdk:2.7.0' Fixed dependency
31. ARCHITECTURE 31 5
32. LAYERS 32
33. FEATURE MODULES 33
34. KEEP ARCHITECTURE CONSISTENT 34
35. CHECK LAYERS 35
36. AUTOMATION 36 5
37. CONTINUOUS INTEGRATION (CI) 37 Change code Run CI checks on each code change in the PR branch Push to repository
38. GITHUB ACTIONS WORKFLOWS 38
39. GITHUB ACTIONS WORKFLOW CONFIG 39 Name Triggers Setup steps Environment Artefact Actual task
40. PR CHECKS 40
41. FLOWS 41 6
42. BUG FIX FLOW 42 Checkout the code Fix the bug Create new branch Push changes and create PR Run CI
43. CI STEPS 43 Checkout source code Build Release Build Debug Release to test channel Unit test Detect Ktlint Android lint Notify testers Step 1 Step 2 Step 3 Step 4 Step 5
44. BUG FIX FLOW 44 Checkout the code Fix the bug Create new branch Push changes and create PR Run CI Review Merge Production Release
45. TAKEAWAYS ◦ Maintain codebase to have consistent code ◦ Create simple, human-readable tests ◦ Use linters ◦ Good architecture will allow you to scale ◦ Use CI to automate releases and PR checks 45
46. RESSOURCES ◦ Android-showcase https://github.com/igorwojda/android-showcase ◦ ktlint https://github.com/pinterest/ktlint ◦ ktlint-gradle https://github.com/JLLeitschuh/ktlint-gradle ◦ detekt https://github.com/detekt/detekt ◦ Android lint https://developer.android.com/studio/write/lint ◦ ArchUnit https://www.archunit.org/ ◦ Semver https://semver.org/ ◦ Github Actions https://github.com/features/actions ◦ Gradle Play Publisher https://github.com/Triple-T/gradle-play-publisher ◦ Gradle Dependency Lock Plugin https://github.com/nebula-plugins/ gradle-dependency-lock-plugin 46
47. 47 ANY QUESTIONS? Find me on twitter @IgorWojda Thanks!
48. 48 Special thanks to SlidesCarnival who made and released these awesome presentation template for free. Credits