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How to start Android app development wasabeef GDG Tokyo New Year 2018

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About me Daichi Furiya Google Developer Expert CyberAgent, Inc. @wasabeef_jp wasabeef

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Android OS

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8.1 Oreo (2017/12) Unix like (C/C++, Java) smartphones, tablets, 
 TV, wear, auto Android OS

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Lessons

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Building Your First App Different Devices Lifecycles System Permissions Lessons

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Building Your First App Different Devices Lifecycles System Permissions Lessons

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Building Your First App Different Devices Lifecycles System Permissions Lessons

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Building Your First App Different Devices Lifecycles System Permissions Lessons

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Building Your First App Different Devices Lifecycles System Permissions Lessons

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Building Your First App

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Android Studio d.android.com/studio

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Demo!

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Kotlin

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Concise Safe Interoperable Tool-Friendly Kotlin Kotlin Koans Online
 https://try.kotlinlang.org

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Diffrent Devices

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Diffrent Devices

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Versions (2018/01) Version Release Date Codename API Distribution 2.3.3 - 2.3.7 2010/12 Gingerbread 10 0.4% 4.0.3 - 4.0.4 2011/10 Ice Cream 15 0.5% 4.1.x 2012/07 Jelly Bean 16 1.9% 4.2.x 2012/11 17 2.9% 4.3 2013/7 18 0.8% 4.4 2013/10 KitKat 19 12.8% 5.0 2014/11 Lollipop 21 5.7% 5.1 2015/03 22 19.4% 6.0 2015/10 Marshmallow 23 28.6% 7.0 2016/08 Nougat 24 21.1% 7.1 2016/12 25 5.2% 8.0 2016/08 Oreo 26 0.5% 8.1 2017/12 27 0.2%

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Support Library

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Backward Compatibility for newer APIs Convenience and Helper Classes Debugging, Testing and Utilities Support Library

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Support Library // build.gradle (app) dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:1.1.51" implementation "com.android.support:appcompat-v7:27.0.2" implementation "com.android.support:design:27.0.2" }

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Support Library

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Lifecycles

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Lifecycles

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Lifecycles override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } override fun onResume() { super.onResume() } override fun onPause() { super.onPause() } override fun onDestroy() { super.onDestroy() }

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System Permissions

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System Permissions ...

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Internet Camera Storage Location Vibrate System Permissions Calendar Contacts Phone Wake Lock Alarm

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Runtime Permissions at Run time ~ Lollipop (5.x) Marshmallow (6.x) ~

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Etc..

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View Animation Intent Kotlin Support Library RxJava, RxKotlin Android Architecture Components Etc.. Testing Media (ExoPlayer) FireBase DI (Dagger..)

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Thank you. twitter.com/wasabeef_jp wasabeef.jp github.com/wasabeef