Talk about 8 programming languages that can be used in Android development. Droidcon Spain 2015 by @nhpatt

1. N E W A N D R O I D
L A N G U A G E S
J A V I E R G A M A R R A : : @ N H PA T T

2. @ N H PAT T
@ A G I L E C Y L
( 0 9 / 0 5 ! )
@ L I F E R AY
by wiredforlego

3. W H Y ?
by keso s

5. by Julochka

6. S E L F - E S T E E M

7. K C Y. M E / 2 2 N A N

8. S W I F T F O R A N D R O I D ?
by Andreas

9. G R O O V Y

10. S C A L A

11. X T E N D

12. S W I F T

13. K O T L I N

14. H O W M A N Y L A N G U A G E S
H AV E A N D R O I D “ S U P P O R T ” ?

15. • Scala
• Kotlin
• Groovy
• Clojure
• Go
• Ceylon
• XTend
• JS
• C++
• C#
• PHP
• Python
• Ruby
• Swift
• QT
• Perl
• Pascal
• Smalltalk

16. A N Y L A N G U A G E …

17. T H AT ’ S W H Y

18. • JS
• C++
• C#
• PHP
• Scala
• Kotlin
• Groovy
• Go
• Ceylon
• XTend

19. H O W ?

20. • Small TODO app
• Uploaded soon to github
• Big post coming to nhpatt.com

21. F I G H T !
by wiredforlego

22. X T E N D
by Mike

23. X T E N D - W H AT ?
• xtend & xtendroid
• 2011!

24. X T E N D - H O W ?
• Eclipse IDE + SDK, Android Studio incoming?
• About 40 minutes

25. X T E N D - C O D E
@AndroidActivity(R.layout.activity_main) class MainActivity {
@OnCreate
def init(Bundle savedInstanceState) {
}
}

26. X T E N D - C O D E
myButton.onClickListener = [
toast("My message");
]

27. X T E N D - C O D E
val toUpperCaseFunction = [String s|s.toUpperCase]

28. X T E N D - T H I N G S
• Extension methods
• Lambda expressions
• Implicits
• Operator overloading
• Compiles to Java Code

29. X T E N D - O P I N I O N
• Perfect for consulting companies
• Everything does too much
• Java+

30. G R O O V Y
by Bill Toenjes

31. G R O O V Y - W H AT ?
• dynamic (2003) & static (2012!)

32. G R O O V Y - H O W ?
• Android Studio, Groovy Gradle Plugin
• In groovy folder
• About 30 minutes
• SwissKnife

33. G R O O V Y - C O D E
def message = findViewById(R.id.message) as TextView
message.text = messageText;

34. G R O O V Y - C O D E
button.onClickListener = {startActivity(intent)}
@OnClick

35. G R O O V Y - T H I N G S
• Dynamic code & static code (@CompileStatic)
• Traits
• Better apis
• Great gradle integration (dagger support coming)

36. G R O O V Y - S TAT I C

37. G R O O V Y - R U N T I M E

38. G R O O V Y - O P I N I O N
• Java++
• Dynamic code?
• I like groovy but…

39. C E Y L O N
by Mike

40. C E Y L O N - W H AT ?
• Ceylon
• Gavin King
• 2011

41. C E Y L O N - H O W ?
• Eclipse IDE + Ceylon Plugin + PAIN
• About 6 hours (eclipse hell + ceylon hell)

42. A N D R O I D D O C U M E N TAT I O N

43. A N D R O I D D O C U M E N TAT I O N

44. C E Y L O N - C O D E
shared actual void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.Ilayout.activity_main);
assert (is TextView textView = findViewById(R.Iid.action_settings));
}

45. C E Y L O N - T H I N G S
• Type system
• Mixins
• String?
• Packages and modules inside Ceylon

46. C E Y L O N - O P I N I O N
• Not ready. Future?
• Doubt so.

47. S C A L A
by Mike

48. S C A L A - W H AT ?
• Scala
• 2003

49. S C A L A - H O W ?
• Gradle plugin?
• Post 47 degrees: Idea + plugins + SBT + activator…
• About 1 hour

50. T R O L L I N G S C A L A
• findView without casts -> a trait
• scala one liners -> hard to read by others but nice in collections
• scala -> 2.8M with proguard -> heaviest environment
• NPE -> with optionals, great solution IMHO
• implicit context -> magic everywhere
• traits -> quite common (kotlin, ceylon, ‘groovy’…)
• no getters/setters -> quite common
• pattern matching -> it’s nice but pure functional style
• case classes -> a glorified switch/if

51. S C A L A - T H I N G S
• Types
• Multiple programming styles
• Optional

52. S C A L A - O P I N I O N
• I love scala, way better than Java, but…
• Paradigm swift
• Programmers (25 in TIOBE)

53. S C A L A - S C A L O I D
new SVerticalLayout {
STextView("Sign in").textSize(24.5 sp).<<.marginBottom(25 dip).>>
STextView("ID")
SEditText()
STextView("Password")
SEditText() inputType TEXT_PASSWORD
SButton("Sign in")
this += new SLinearLayout {
SButton("Help")
SButton("Sign up")
}.wrap
}.padding(20 dip)

54. S C A L A - M A C R O I D
// the layout goes here
setContentView {
getUi {
l[LinearLayout](
w[Button],
w[TextView]
)
}
}

55. G O
by Nico Kaiser

56. G O - W H AT ?
• Go
• 2009

57. G O - W H AT ?

58. “ W h o s e b e t t i n g t h i s y e a r s I / O w i l l
a n n o u n c e t h e re p l a c e m e n t o f t h e
A n d ro i d A P I w i t h t h e G o A P I ? “

59. “ I l l o g i c a l , i r re s p o n s i b l e , i n s a n e
p e o p l e a re b e t t i n g t h i s . ”
“ G o , f o r C p e o p l e w h o h a t e
C + + b u t a re t o o a f r a i d o f re a l
I D E s f o r J a v a . ”
J a k e W h a r t o n

60. G O - H O W ?
• Docker image (docker -> boot2docker -> missing
steps -> worst hello world ever!)
• About 2 hours (image is 4GB! + docker errors + no
documentation)

61. G O - C O D E
• 2 ways:
• Shared Library (JNI…)
• All go

62. G O - C O D E
• var State
• func Run
• type Callbacks (Start, Stop, Draw)
• Stubs

63. G O - O P I N I O N
• API for OpenGL/business logic
• Not ready for “classic” app.
• I’m worried about iOS support

64. K O T L I N
by Mike

65. K O T L I N - W H AT ?
• Kotlin
• 2011

66. K O T L I N - H O W ?
• Android Studio plugin
• About 10 minutes

67. K O T L I N - T H I N G S
• Traits
• Interoperability with Java!
• Extension Methods
• Null?

68. T R O L L I N G K O T L I N
• class Leiva : Untrollable

69. K O T L I N - O P I N I O N
• I love Kotlin.
• Really easy learning curve.
• Few programmers doing Kotlin :(

70. J AVA 8
asdasdasdby Mike

71. J AVA 8
• JDK7: <>, multi-catch, strings in switches, try with
resources…
• And java NIO/invokedynamic?

72. J AVA 8
• And Java 8? (Lambdas/default methods/new date
API…)

73. • Jack & Jill?

74. R E T R O L A M B D A
asdasdasdby Marcos Bessa

75. R E T R O L A M B D A - W H AT ?
• Lambdas
• Default Methods
• Static Methods on interfaces

76. R E T R O L A M B D A - H O W ?
• Gradle Plugin
• About 30 minutes

77. R E T R O L A M B D A - C O D E
(View v) -> Toast.makeText(this, “Hi!”, LENGTH_SHORT).

78. R E T R O L A M B D A - O P I N I O N
• An incomplete hack.
• Nice if you don’t have any other option.

79. A N D T H E T R O P H I E S G O T O …

80. G O
F O R B E I N G T H E
M O S T H Y P E D
by David Luders

81. C E Y L O N
F O R N O T
B E I N G T H E R E
by David Luders

82. S C A L A
C O N S O L AT I O N
P R I Z E
by David Luders

83. K O T L I N
by David Luders

84. F I N A L W O R D S
by jmiguel rodriguez

85. N O T A N E W Q U E S T I O N

86. T H AT M E A N S S O M E T H I N G

87. N O T O N LY S Y N TA C T I C S U G A R
asdasdasdby Steve Maw

88. D A R T A N Y O N E ?
by Sasha Nilov

89. N E X T
asdasdasdby Pascal

90. E N D *
* ¿ A L G U I E N Q U I E R E Q U E L E M O N T E U N
E N T O R N O ?
asdasdasdby Gord McKenna

91. A N Y Q U E S T I O N S ?

92. T H A N K S ! - > K C Y. M E / 2 2 N D 2
by Ale Art

93. O K … K O T L I N V S S C A L A , F I G H T !

94. O K … K O T L I N V S S C A L A , F I G H T !

95. O K … K O T L I N V S S C A L A , F I G H T !

96. O K … K O T L I N V S S C A L A , F I G H T !

97. O K … K O T L I N V S S C A L A , F I G H T !
• Kotlin ppl are nice: comparison to scala -> if u are
already using Scala or need sth on that list…
• A good, external, comparison

98. O K … K O T L I N V S S C A L A , F I G H T !
• The main design goals behind “Kotlin” are:
• To create a Java-compatible language,
• That compiles at least as fast as Java,
• Make it safer than Java, i.e. statically check for common pitfalls such as
null pointer dereference,
• Make it more concise than Java by supporting variable type inference,
higher-order functions (closures), extension functions, mixins and first-
class delegation, etc;
• And, keeping the useful level of expressiveness (see above), make
it way simpler than the most mature competitor – Scala.

99. N E W A N D R O I D
L A N G U A G E S
J A V I E R G A M A R R A : : @ N H PA T T