How To Built Uranow Android App

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How To Built Uranow Android App 2018.02.13 Toru Furuya

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Agenda 1. Project Overview 2. Application Overview 3. Development Rule 4. Future Expectation

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Project Overview

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Project Overview ● 2017/11/Mid - 2018/02/09 (About 3 months) ● 3 - 4 Members (One was super begineer in Android (It’s me!!!)) ● iOS App was released in advanse ● 30min Sprint Planning once a week

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Application Overview

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Application Overview ● Overall Transition Diagram ● Architecture ● Dependencies ● In App Billing

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Architecture Controller View Controller Model + Infra?

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Architecture ● Activity/Fragment → API Client ● Pure? MVC Architecture ● What is Layered Architecture? Is it tasty?

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Dependencies ● Kotlin v1.1.51 ● Retrofit2 ● Okhttp3 ● RxJava ● RxLifecycle ● Butterknife ● Glide ● Spotlight

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Retrofit2, Okhttp3

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Retrofit2, Okhttp3

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RxJava, RxLifecycle

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RxJava, RxLifecycle onSuccess onError

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In App Billing ● Play Billing Library ● version 1.0 released @2017/10/18 “ The Play Billing Library is written in Java and provides convenience classes and features, which you can use to implement in-app billing into your Android apps. The library is a wrapper for the Android Interface Definition Language (AIDL) file that defines the interface to the In-app Billing service. ”

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Development Rule

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Development Rule ● Variables Naming Rule ● Activity Creating Rule ● Fragment Creating Rule ● View-Binding Rule ● Code Formatting Rule

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Variables Naming Rule ● Don’t use “m” and “s” prefixes ● Don’t define static vars which isn’t final

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View-Binding Rule ● Use at least one Fragment for each Activity ● Activity doesn’t hold View subclasses, Fragment does instead ● Don’t use by lazy in Fragment, but use Butterknife ○ unable to clear cached views in a Fragment’s onDestroyView() ○ Pros/cons of Android view access strategies ○ FragmentでKotlinのby lazyを使ってfindViewByIdするとレイアウト反映できない &リークする件

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● Follow the ktlint rule (Refer to My Previous Presentation about ktlint) ● We have to do ktlint Formatting before commit (All we need to do is to type below command) ● Otherwise, Mr. Jenkins criticizes your code which isn’t follow the rule Code Formatting Rule

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Future Expectation

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Future Expectation ● Layered Architecture (or Alternatives) ● More Reactive Programming ● Lint Rule Customization with ktlint