Android Standard 2022

Android Code Standard 2022

Standard#

• Architecture
  • Design Pattern
  • Foldering/packaging
  • Compose Architecture
• Code style and features
• Documentation
• Security
• Best Practice
• Naming Composable Widget & Resources
• Third party libraries

Architecture#

• Core Library
• Modular
  • Project Features splited by module/library as possible
  • Core module to support other module/project
• Architecture Components Android Jetpack
• Design Pattern MVVM

Core Library#

• Network/ Connection configurations
• Base -> ViewModel, Activity, Fragment, Adapter, WebView, etc
• Utils & Extentions
• Widgets
• Analytics Repository (for log event)
• In app updates function

Please check Core Library Repo for detail of how to use core library.

Modular Project#

• app : main module project

• module-1..module-N : module of features. To define module of feature, create a group of features. For example if we have a project like Gojek may the module are like below.

  Module Name	Description
  auth	Module for authentication. In here there are login, register, forgot password
  go-food	Module for GoFood. There are near me, voucher/ promo (go-food), history, etc.
  go-send	Module for GoSend. There are within city, intercity and voucher

• common : is a module to support other modules that have common used classes in project following their own contract/business model.

• core : core library.

Foldering/Packaging#

Structure of foldering/packaging in module are like this

app (module name)
│─── di
│  │   ...
│─── model
│  │   NotifRequestModel
│  │   NotifResponseModel
│─── repository
│  │   ...
│─── service
│  │   ...
│─── ui
│  │   main
│  │  │   MainViewModel
│  │  │   MainScreen
│  │  │   MainContent
│  │   notif
│  │  │   ...
│─── util
│  │   ...

Compose Architecture#

Code Style, Features#

Code

• Kotlin style guide
• Using Jetpack Compose

Features

• Deeplink
• Analytics

Documentation#

• K-Doc format, and use dokka engine documentation
• Format Markdown

Security#

• Proguard
• SSL Pinning
• Integrate Keystore
• Env variable value (cred data : Global Properties)
• Root (firebase)

Best Practice#

• Single-Activity arch
• Use Navigation Component
• Using kotlin with reactive programming
• Min SDK 21
• Using Dependency Injection
• Assets svg
• Core GraphQL (replacing webservice)
• Core Webservice
• Theme & Styling
• Tablet Version
  • Separated apk mobile and tablet
  • Same core business logic
  • Same repository (splited by branch)
  • Only different on layout
• Jetpack Compose
  • All of @Composable components should be able to use @Preview (use initial/mock data and no error when preview the widget)
  • State with ViewModel.
  • Place the state at StateHolder (use State Hoisting way).
  • Create reusable widget as possible (prevent redundant code).
• Setup Android CI/CD

Don’t do it#

• Don’t use beta/ alpha library version
• Don’t use Kotlin synthetics (not longer supported), use view binding instead
• To handle nullable don’t use !!, using lateinit, ?., ?: or ?.let{ /do something/ } instead

Naming Composable Widget Function#

Most commonly used naming Android Composable function following format NameAbbrevation like below.

Naming Resource#

Drawables#

We use _ for strings naming. is Button,Dialog,Divider,Icon, etc & description give any extra information.

String#

String names start with a prefix that identifies the section they belong to. We use <HOW>_<DESCRIPTION> for strings naming. <HOW> to indicate reason of the string will be used & description give any extra information.

For ex:

• <string name="label_update_app_now">Update aplikasi sekarang!</string> : how = label & update_app_now is description of the string.
• <string name="hint_user_name">Masukkan Username : how = hint & user_name is the description of string.

Third party libraries#

• Jetpack Components
• navigation, paging, camera, fragment, livedata, room, etc
• Async : Coroutines
• Dependency Injection : Dagger2/ Koin
• Network/ Connection : Retrofit
• Unit Testing : JUnit + Mockito
• Load Image : Glide
• Others : From google first than commons used