Things I learned about native Android app development the extra hard way

Interested in becoming a native Android application developer? I will cover tips I learned from transitioning from backend Java development. This includes an overview of the fragmented Android ecosystem as well as the consequential challenges for Android development to handle the following:

• Multiple device sizes, resolutions
• Screen orientations
• Localization (text, component alignment)

These considerations will be framed in terms of the Android build system workflow (*).

(*) Don’t worry, I will not cover all of the steps.

Transcript

1. THINGS I’VE LEARNED ABOUT NATIVE ANDROID APPLICATION DEVELOPMENT SHIRLEY GAW, DASHLANE …the extra hard way @shirlsgaw, shirley.gaw@gmail.com
2. I KNOW JAVA, ANDROID DEVELOPERS CODE IN JAVA (*), RIGHT? IT ALL SEEMED EASY AT FIRST (*) A smaller fraction might do it in Kotlin, Android Swift
3. http://tools.android.com/tech-docs/new-build-system/build-workflow
4. http://tools.android.com/tech-docs/new-build-system/build-workflow
5. http://tools.android.com/tech-docs/new-build-system/build-workflow
6. MY OLD BACKEND WORLD: JAVA SOURCE CODE TO RUNNING APPLICATIONS SIMPLE JAVA APPLICATIONS ▸ To Java byte code (class files) ▸ To java runtime Image: http://www.javaguicodexample.com/javainstalltestusejdk.html
7. bash-3.2$ ls HelloWorld.java bash-3.2$ javac HelloWorld.java bash-3.2$ ls HelloWorld.class HelloWorld.java bash-3.2$ java HelloWorld Hello world!
8. MY OLD BACKEND WORLD: JAVA SOURCE CODE TO RUNNING APPLICATIONS SIMPLE JAVA APPLICATIONS ▸ To Java byte code (class files) ▸ To java runtime
9. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS ANDROID APPS ▸ To Java byte code ▸ To Java runtime ▸ … ▸ To Android APKs ▸ To Android devices ▸ To Android runtime Images: http://developer.android.com/about/versions/lollipop.html http://crackberry.com/android
10. LET’S TALK MARKET STRATEGY
11. UMBERTO ECO …ARGUED THAT THE APPLE MAC WAS A CATHOLIC MACHINE, IN CONTRAST TO THE PC, WHICH, HE ARGUED, WAS CLEARLY A PROTESTANT DEVICE. HOW SO? JOHN NAUGHTON http://www.theguardian.com/commentisfree/2015/oct/18/were-all-casualties-holy-war-android-security-apple-john-naughton
12. THE MAC FREED ITS USERS/BELIEVERS FROM THE NEED TO MAKE DECISIONS. ALL THEY HAD TO DO TO FIND SALVATION WAS TO FOLLOW THE APPLE WAY. IN CONTRAST, ECO POINTED OUT, THE POOR WRETCHES WHO USED A PC HAD, LIKE THE CALVINISTS OF YORE – TO MAKE THEIR OWN SALVATION. FOR THEM, THERE WAS NO ONE TRUE WAY.
13. TODAY’S CATHOLICS HAVE IPHONES RUNNING THE APPLE IOS OPERATING SYSTEM… WHILE THE CALVINISTS HAVE DEVICES MADE BY A HOST OF MANUFACTURERS AND POWERED BY VARIOUS FLAVOURS OF THE ANDROID OPERATING SYSTEM.
14. Phone Platform 2015 Q2 Market Share Android 82,8 % iOS 13,9 % Windows 2,6 % Other 0,7 % *Source: http://www.idc.com/prodserv/smartphone-os-market-share.jsp
15. Phone Manufacturer 2015 Q2 Market Share Samsung 21.4 % Apple 13,9 % Huawei 8.7 % Xiaomi 5,6 % Lenovo/Motorola 4,9 % Other 45,7 % *Source: http://www.idc.com/prodserv/smartphone-os-market-share.jsp
16. Top Android Phone Manufacturers Market Share Samsung 51,6 % LG 5,9 % Huawei 4,3 % Motorola 3,9 % Lenovo 3,9 % HTC 2,5 % *Source: http://www.appbrain.com/stats/top-manufacturers
17. Top Android Phone Model Market Share Samsung Galaxy S3 3,4 % Samsung Galaxy Grand Prime 3,0 % Samsung Galaxy S5 2,8 % Samsung Galaxy S4 2,7 % Samsung Galaxy Note3 2,3 % Motorola Moto G 2,1 % *Source: http://www.appbrain.com/stats/top-android-phones
18. TODAY’S CATHOLICS HAVE IPHONES RUNNING THE APPLE IOS OPERATING SYSTEM… WHILE THE CALVINISTS HAVE DEVICES MADE BY A HOST OF MANUFACTURERS AND POWERED BY VARIOUS FLAVOURS OF THE ANDROID OPERATING SYSTEM.
19. http://developer.android.com/about/dashboards/index.html
20. http://developer.android.com/about/dashboards/index.html
21. http://developer.android.com/about/dashboards/index.html Released October 2015
22. http://developer.android.com/about/dashboards/index.html Released July 2012
23. WHILE THE CALVINISTS HAVE DEVICES MADE BY A HOST OF MANUFACTURERS AND POWERED BY VARIOUS FLAVOURS OF THE ANDROID OPERATING SYSTEM.
24. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS ANDROID APPS ▸ To Java byte code ▸ To Java runtime ▸ … ▸ To Android APKs ▸ To Android devices ▸ To Android runtime Images: http://developer.android.com/about/versions/lollipop.html http://crackberry.com/android
25. http://tools.android.com/tech-docs/new-build-system/build-workflow
26. http://tools.android.com/tech-docs/new-build-system/build-workflow
27. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (2) ANDROID APPS ▸ To Java byte code ▸ … ▸ To Android devices ▸ To Android runtime
28. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (2) ANDROID APPS ▸ To Java byte code ▸ … ▸ To dex byte code ▸ … ▸ To Android devices ▸ To Android runtime
29. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (2) ANDROID APPS ▸ To Java byte code ▸ … ▸ To dex byte code ▸ To Android APKs ▸ … ▸ To Android devices ▸ To Android runtime
30. LET’S TALK TOOLS
31. http://developer.android.com/develop/index.html
32. HELLO WORLD (ANDROID STUDIO)
33. GRADLE BUILD SYSTEM Image: https://www.redfin.com/blog/wp-content/uploads/sites/5/2013/11/gardle-android.png
34. BUILD.GRADLE (MY APPLICATION) buildscript { repositories { jcenter() } dependencies { classpath 'com.android.tools.build:gradle:2.0.0-rc1' } } https://bintray.com/bintray/jcenter Image: http://androidxiphone.com/wp-content/uploads/2015/02/Best-Android-Tools-Apps-2015.png
35. http://tools.android.com/tech-docs/new-build-system/build-workflow
36. BUILD.GRADLE (APP) apply plugin: 'com.android.application'
 
 android {
 …
 buildToolsVersion "23.0.0 rc3"
 
 defaultConfig {
 applicationId "com.playground.sgaw.sample.myapplication"
 … }
 buildTypes {
 … }
 }
 
 dependencies {
 …
 }

37. http://tools.android.com/tech-docs/new-build-system/build-workflow
38. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (2) ANDROID APPS ▸ To Java byte code ▸ … ▸ To dex byte code ▸ To Android APKs ▸ … ▸ To Android devices ▸ To Android runtime
39. AND SO OUR TROUBLES BEGIN
41. bash-3.2$ ./gradlew assembleDebug Download https://jcenter.bintray.com/com/android/tools/ build/gradle/2.0.0-rc1/gradle-2.0.0-rc1.pom … Incremental java compilation is an incubating feature. :app:preBuild UP-TO-DATE … :app:compileDebugSources :app:prePackageMarkerForDebug :app:transformClassesWithDexForDebug … :app:packageDebug :app:zipalignDebug :app:assembleDebug BUILD SUCCESSFUL Total time: 29.956 secs
42. https://speakerdeck.com/madisp/squeezing-the-last-drop-of-performance-out-of-your-gradle-builds- droidcon-paris-2015 https://www.youtube.com/watch?v=AbNhen_zn-c ./gradlew --daemon assembleDebug ./gradlew --daemon --profile assembleDebug
45. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (2) ANDROID APPS ▸ To Java byte code ▸ … ▸ To dex byte code ▸ To Android APKs ▸ To Android devices ▸ To Android runtime
46. FAVOURING PLAIN OLD JAVA OBJECTS (POJO) UNIT TESTING ▸ Android’s runtime byte code != Java byte code ▸ Java unit tests != Android unit tests (*) ▸ (*) Java unit tests == Android unit tests iff compilation stops at Java byte code
47. JAVA SOURCE CODE TO JAVA UNIT TESTS ANDROID APPS ▸ To Java byte code ▸ (Run Java unit tests) ▸ … ▸ To dex byte code ▸ To Android APKs ▸ To Android devices ▸ To Android runtime
48. bash-3.2$ ./gradlew --daemon test Incremental java compilation is an incubating feature. … :app:compileDebugJavaWithJavac UP-TO-DATE :app:preDebugUnitTestBuild UP-TO-DATE :app:prepareDebugUnitTestDependencies :app:compileDebugUnitTestJavaWithJavac :app:processDebugJavaRes UP-TO-DATE :app:processDebugUnitTestJavaRes UP-TO-DATE :app:compileDebugUnitTestSources :app:mockableAndroidJar :app:assembleDebugUnitTest :app:testDebugUnitTest … :app:test BUILD SUCCESSFUL Total time: 10.806 secs bash-3.2$
49. https://speakerdeck.com/madisp/squeezing-the-last-drop-of-performance-out-of-your-gradle-builds- droidcon-paris-2015 https://www.youtube.com/watch?v=AbNhen_zn-c bash-3.2$ ./gradlew --daemon --continuous :app:testDebugUnitTest --tests="com.playground.sgaw.sample.myapplication.ExampleUnitTest.*" Continuous build is an incubating feature. Incremental java compilation is an incubating feature. … BUILD SUCCESSFUL Total time: 2.927 secs Waiting for changes to input files of tasks... (ctrl-d to exit)-
50. http://tools.android.com/tech-docs/new-build-system/build-workflow
51. http://tools.android.com/tech-docs/new-build-system/build-workflow
52. <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context="com.playground.sgaw.sample.myapplication.MainActivity">
 
 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"/>
 </RelativeLayout>

53. <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
 xmlns:android="http://schemas.android.com xmlns:tools="http://schemas.android.com/t android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_ve android:paddingLeft="@dimen/activity_hori android:paddingRight="@dimen/activity_hor android:paddingTop="@dimen/activity_verti tools:context="com.playground.sgaw.sample 
 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"/>
 </RelativeLayout>

54. <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:background="@android:color/holo_red_dark"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context="com.playground.sgaw.sample.myapplication.MainActivity">
 
 <TextView
 android:background="@android:color/holo_green_dark"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"/>
 </RelativeLayout>

55. <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:background="@android:color/holo_red_dark"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context="com.playground.sgaw.sample.myapplication.MainActivity">
 
 <TextView
 android:background="@android:color/holo_green_dark"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"/>
 </RelativeLayout>

56. <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 tools:background="@android:color/holo_red_dark"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context="com.playground.sgaw.sample.myapplication.MainActivity">
 
 <TextView
 tools:background="@android:color/holo_green_dark"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"/>
 </RelativeLayout>
 https://www.youtube.com/watch?v=AeoeD7K8vKI https://speakerdeck.com/rock3r/tools-of-the-trade-droidcon-nyc-2015
58. http://tools.android.com/tech-docs/new-build-system/build-workflow
59. ALTERNATIVE RESOURCES: SCREEN ORIENTATION Image: http://inthecheesefactory.com/aca/The%20Android%20Cheese%20Sheet%20rev%204.pdf
60. MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml http://developer.android.com/guide/topics/resources/providing-resources.html ALTERNATIVE RESOURCES: SCREEN ORIENTATION
61. MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml ALTERNATIVE RESOURCES: SCREEN ORIENTATION MyProject/ … layout/ main.xml info.xml layout-land/ main.xml …
62. http://tools.android.com/tech-docs/new-build-system/build-workflow
63. WHILE THE CALVINISTS HAVE DEVICES MADE BY A HOST OF MANUFACTURERS AND POWERED BY VARIOUS FLAVOURS OF THE ANDROID OPERATING SYSTEM.
64. SCREEN SIZES http://developer.android.com/about/dashboards/index.html
65. ALTERNATIVE RESOURCES: SCREEN SIZES MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml http://developer.android.com/guide/topics/resources/providing-resources.html small normal large xlarge sw320dp sw600dp sw720dp Screen size Minimum screen width
66. ALTERNATIVE RESOURCES: SCREEN SIZES MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml http://developer.android.com/guide/topics/resources/providing-resources.html sw320dp sw600dp sw720dp Minimum screen width MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml sw320dp sw600dp sw720dp
67. ALTERNATIVE RESOURCES: SCREEN SIZES MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml http://developer.android.com/guide/topics/resources/providing-resources.html sw320dp sw600dp sw720dp MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml sw320dp sw600dp sw720dp MyProject/ … layout/ main.xml … layout-sw600dp/ main.xml …
68. http://tools.android.com/tech-docs/new-build-system/build-workflow
69. ALTERNATIVE RESOURCES: SCREEN DENSITY MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml http://developer.android.com/guide/topics/resources/providing-resources.html ldpi mdpi hdpi xhdpi xxhdpi xxxhdpi nodpi tvdpi
70. http://tools.android.com/tech-docs/new-build-system/build-workflow
71. http://tools.android.com/tech-docs/new-build-system/build-workflow Image: http:// thinkapps.com/ blog/ development/ platform-build- first-ios-vs- android/
72. http://cyrilmottier.com/2014/08/26/putting-your-apks-on-diet/ Image: http://kliknklik.com/blogs/program-diet-perangkat-android/
73. http://cyrilmottier.com/2014/08/26/putting-your-apks-on-diet/ http://developer.android.com/about/dashboards/index.html Image: http://kliknklik.com/blogs/program-diet-perangkat-android/
74. ALTERNATIVE RESOURCES MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml http://developer.android.com/guide/topics/resources/providing-resources.html ldpi mdpi hdpi xhdpi xxhdpi xxxhdpi nodpi tvdpi MyProject/ … drawable-mdpi/ graphic.png drawable-hdpi/ graphic.png drawable-xdpi/ graphic.png drawable-xxdpi/ graphic.png … ALTERNATIVE RESOURCES: SCREEN DENSITY
75. http://cyrilmottier.com/2014/08/26/putting-your-apks-on-diet/
76. http://cyrilmottier.com/2014/08/26/putting-your-apks-on-diet/ (Caveat: Feb 2015) Ideally use vector drawables in support library 23.2 http://android-developers.blogspot.fr/ 2016/02/android-support- library-232.html
77. http://tools.android.com/tech-docs/new-build-system/build-workflow
78. ALTERNATIVE RESOURCES: LOCALIZATION MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml
79. ALTERNATIVE RESOURCES: LOCALIZATION MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml es fr de it
80. ALTERNATIVE RESOURCES: LOCALIZATION MyProject/ src/ MyActivity.java res/ drawable/ graphic.png layout/ main.xml info.xml mipmap/ icon.png values/ strings.xml es fr de it MyProject/ … values/ strings.xml values-es/ strings.xml values-fr/ strings.xml values-de/ strings.xml values-it/ strings.xml …
81. http://tools.android.com/tech-docs/new-build-system/build-workflow
82. http://tools.android.com/tech-docs/new-build-system/build-workflow
83. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (2) ANDROID APPS ▸ To Java byte code ▸ … ▸ To dex byte code ▸ To Android APKs ▸ To Android devices ▸ To Android runtime
84. FAVOURING PLAIN OLD JAVA OBJECTS (POJO) UNIT TESTING ▸ Android’s runtime byte code != Java byte code ▸ Java unit tests != Android unit tests (*) ▸ (*) Java unit tests == Android unit tests iff compilation stops at Java byte code
85. PROBLEM SOLVED, RIGHT?
86. bash-3.2$ ./gradlew --daemon --continuous test Continuous build is an incubating feature. Incremental java compilation is an incubating feature. … :app:compileDebugJavaWithJavac UP-TO-DATE :app:preDebugUnitTestBuild UP-TO-DATE :app:prepareDebugUnitTestDependencies :app:compileDebugUnitTestJavaWithJavac UP-TO-DATE :app:processDebugJavaRes UP-TO-DATE :app:processDebugUnitTestJavaRes UP-TO-DATE :app:compileDebugUnitTestSources UP-TO-DATE :app:mockableAndroidJar UP-TO-DATE :app:assembleDebugUnitTest UP-TO-DATE :app:testDebugUnitTest UP-TO-DATE
87. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (2) ANDROID APPS ▸ To Java byte code ▸ … ▸ To dex byte code ▸ To Android APKs ▸ To Android devices ▸ To Android runtime
88. THE MOBILE WORLD: JAVA SOURCE CODE TO RUNNING ANDROID APPS (3) ANDROID APPS ▸ (Plus android.jar) ▸ To Java byte code ▸ … ▸ To dex byte code ▸ To Android APKs ▸ To Android devices ▸ To Android runtime
89. THE ANDROID.JAR FILE THAT IS USED TO RUN UNIT TESTS DOES NOT CONTAIN ANY ACTUAL CODE - THAT IS PROVIDED BY THE ANDROID SYSTEM IMAGE ON REAL DEVICES. INSTEAD, ALL METHODS THROW EXCEPTIONS (BY DEFAULT). http://tools.android.com/tech-docs/unit-testing- support UNIT TESTS
90. WHY IS THIS STUBBED OUT?! ANDROID.JAR’S SCOPE IS LARGER THAN YOU’D THINK ▸ Android OS (files, network, database, …) ▸ Android data containers (Context, Bundle, Intent, SharedPreferences) ▸ Memory savers like optimized data structures (SparseArray, …) ▸ Log statements ▸ JSON parsing
91. WHY IS THIS STUBBED OUT?! ANDROID.JAR’S SCOPE IS LARGER THAN YOU’D THINK ▸ Android OS (files, network, database, …) ▸ Android data containers (Context, Bundle, Intent, SharedPreferences) ▸ Memory savers like optimized data structures (SparseArray, …) ▸ Log statements ▸ JSON parsing “Use Android- Appropriate Data Structures” https://medium.com/google-developers/developing-for-android-v-f6b8038b42f5#.g96l5ayh1
92. OPTIONS FOR USING ANDROID.JAR ▸ Ignore exceptions via build.gradle configuration ▸ Mock behavior ▸ Use instrumentation unit tests ▸ Android instrumented unit tests ▸ Robolectric unit tests ▸ Espresso tests http://fragmentedpodcast.com/episodes/1/
93. OPTIONS FOR USING ANDROID.JAR ▸ Ignore exceptions via build.gradle configuration ▸ Mock behavior ▸ Use instrumentation unit tests ▸ Android instrumented unit tests ▸ Robolectric unit tests ▸ Espresso tests
94. apply plugin: 'com.android.application'
 
 android {
 …
 buildToolsVersion "23.0.0 rc3"
 
 defaultConfig {
 applicationId "com.playground.sgaw.sample.myapplication"
 … }
 buildTypes {
 … } testOptions {
 unitTests.returnDefaultValues = true
 } 
 }
 
 http://tools.android.com/tech-docs/unit-testing-support
95. OPTIONS FOR USING ANDROID.JAR ▸ Ignore exceptions via build.gradle configuration ▸ Mock behavior ▸ Use instrumentation unit tests ▸ Android instrumented unit tests ▸ Robolectric unit tests ▸ Espresso tests
96. OPTIONS FOR USING ANDROID.JAR ▸ Ignore exceptions via build.gradle configuration ▸ Mock behavior ▸ Use instrumentation unit tests ▸ Android instrumented unit tests ▸ Robolectric unit tests ▸ Espresso tests http://fragmentedpodcast.com/episodes/1/
97. WHY IS THIS STUBBED OUT?! ANDROID.JAR’S SCOPE IS LARGER THAN YOU’D THINK ▸ Android OS (files, network, database, …) ▸ Android data containers (Context, Bundle, Intent, SharedPreferences) ▸ Memory savers like optimized data structures (SparseArray, …) ▸ Log statements ▸ JSON parsing “Use Android- Appropriate Data Structures”
98. COUNTER-INTUITIVELY, THIS IS NOT INCLUDED… ANDROID.JAR’S SCOPE IS SMALLER THAN YOU’D THINK ▸ play services (app invites, analytics, Maps API, Wallet) ▸ support library for backward compatibility
99. ANDROID’S PROLIFERATION IS THE STUFF OF NIGHTMARES ANDROID.JAR’S SCOPE IS SMALLER THAN YOU’D THINK ▸ play services (app invites, analytics, Maps API, Wallet) because Google cannot force OS updates but want a consistent functionality ▸ support library for backward compatibility because Google cannot force OS updates when they don’t manufacture the phones and when the OS is open source
100. JUST FOR KICKS…
101. COUNTER-INTUITIVELY, THIS IS NOT INCLUDED… ANDROID.JAR’S SCOPE IS SMALLER THAN YOU’D THINK ▸ play services (app invites, analytics, Maps API, Wallet) ▸ support library for backward compatibility “Use Android- Appropriate Data Structures”
102. COUNTER-INTUITIVELY, THIS IS NOT INCLUDED… ANDROID.JAR’S SCOPE IS SMALLER THAN YOU’D THINK ▸ play services (app invites, analytics, Maps API, Wallet) ▸ support library for backward compatibility “Use Android- Appropriate Data Structures”
103. COUNTER-INTUITIVELY, THIS IS NOT INCLUDED… ANDROID.JAR’S SCOPE IS SMALLER THAN YOU’D THINK ▸ play services (app invites, analytics, Maps API, Wallet) ▸ support library for backward compatibility “Use Android- Appropriate Data Structures”
104. ANDROID’S PROLIFERATION IS THE STUFF OF NIGHTMARES ANDROID.JAR’S SCOPE IS SMALLER THAN YOU’D THINK ▸ support library for backward compatibility because Google cannot force OS updates when they don’t manufacture the phones and when the OS is open source ▸ play services (app invites, analytics, Maps API, Wallet) because Google cannot force OS updates but want a consistent functionality
105. FOR ANDROID WORSHIPPERS… THEIR FATE LARGELY DEPENDS ON HOW CONSCIENTIOUS THE MANUFACTURER OF THEIR DEVICE IS ABOUT KEEPING THEM UP TO DATE…
106. AND WHEN THE CATHOLICS PUT THEIR DEVICES ON TO CHARGE OVERNIGHT THEY WAKE UP IN THE MORNING TO FIND THAT APPLE HAS DOWNLOADED YET ANOTHER UPDATE.
107. http://tools.android.com/tech-docs/new-build-system/build-workflow
108. REFERENCES ▸ Documentation: http://developer.android.com/develop/index.html ▸ API Reference: https://developer.android.com/reference/packages.html ▸ Android developers: http://android-developers.blogspot.fr/ ▸ Android Developers (YouTube) : https://www.youtube.com/channel/UCVHFbqXqoYvEWM1Ddxl0QDg ▸ Fragmented Podcast: http://fragmentedpodcast.com/ ▸ Android Weekly newsletter: http://androidweekly.net/ ▸ The Cheese Sheet http://inthecheesefactory.com/aca/The Android Cheese Sheet rev 4.pdf ▸ Jake Wharton, https://twitter.com/JakeWharton ▸ Cyril Mottier, https://twitter.com/cyrilmottier
109. NEVER FORGET Cmd + Option + A
110. COMMON LIBRARIES ▸ Glide, https://github.com/bumptech/glide ▸ Square GitHub, http://square.github.io/ ▸ Retrofit, http://square.github.io/retrofit/ ▸ OkHttp, http://square.github.io/okhttp/