How to start Android app development

How to start Android app development

1. How to start Android app development wasabeef GDG Tokyo New Year 2018
2. About me Daichi Furiya Google Developer Expert CyberAgent, Inc. @wasabeef_jp wasabeef
3. Android OS
4. 8.1 Oreo (2017/12) Unix like (C/C++, Java) smartphones, tablets, 
 TV, wear, auto Android OS
6. Lessons
7. Building Your First App Different Devices Lifecycles System Permissions Lessons
8. Building Your First App Different Devices Lifecycles System Permissions Lessons
9. Building Your First App Different Devices Lifecycles System Permissions Lessons
10. Building Your First App Different Devices Lifecycles System Permissions Lessons
11. Building Your First App Different Devices Lifecycles System Permissions Lessons
12. Building Your First App
13. Android Studio d.android.com/studio
14. Demo!
16. Kotlin
17. Concise Safe Interoperable Tool-Friendly Kotlin Kotlin Koans Online
 https://try.kotlinlang.org
18. Diffrent Devices
19. Diffrent Devices
20. 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%
21. Support Library
22. Backward Compatibility for newer APIs Convenience and Helper Classes Debugging, Testing and Utilities Support Library
23. 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" }
24. Support Library <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="end|bottom" android:src="@drawable/ic_my_icon" android:layout_margin="16dp" />
25. Lifecycles
26. Lifecycles
27. 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() }
28. System Permissions
29. System Permissions <!— AndroidManifest.xml —> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="jp.wasabeef.demo" > <uses-permission android:name="android.permission.INTERNET" /> ... </manifest>
30. Internet Camera Storage Location Vibrate System Permissions Calendar Contacts Phone Wake Lock Alarm
31. Runtime Permissions at Run time ~ Lollipop (5.x) Marshmallow (6.x) ~
32. Etc..
33. View Animation Intent Kotlin Support Library RxJava, RxKotlin Android Architecture Components Etc.. Testing Media (ExoPlayer) FireBase DI (Dagger..)
34. Thank you. twitter.com/wasabeef_jp wasabeef.jp github.com/wasabeef