Scala on androids

1. Scala on Androids Thor Åge Eldby @thoraageeldby 1

2. Me C/C ++ a av lJ na so J2M r Pe E Java An dro id Scala 2

3. Arktekk • Started 2007 • Consultancy and training 3

4. Android Fringe to mainstream 4

5. Android 101 5

6. Android 101 Linux 5

7. Android 101 OpenCore Linux 5

8. Android 101 OpenCore SQLite Linux 5

9. Android 101 OpenGL OpenCore SQLite ES Linux 5

10. Android 101 OpenGL OpenCore SQLite WebKit ES Linux 5

11. Android 101 OpenGL OpenCore SQLite WebKit Other ES Linux 5

12. Android 101 Dalvik OpenGL OpenCore SQLite WebKit Other ES Linux 5

13. Android 101 Apache Harmony Dalvik OpenGL OpenCore SQLite WebKit Other ES Linux 5

14. Android 101 Apache HttpClient Harmony Dalvik OpenGL OpenCore SQLite WebKit Other ES Linux 5

15. Android 101 Apache HttpClient org.json Harmony Dalvik OpenGL OpenCore SQLite WebKit Other ES Linux 5

16. Android 101 Apache HttpClient org.json DOM/SAX Harmony Dalvik OpenGL OpenCore SQLite WebKit Other ES Linux 5

17. Android 101 Apache HttpClient org.json DOM/SAX Android Harmony Dalvik OpenGL OpenCore SQLite WebKit Other ES Linux 5

18. Android SDK

19. Android SDK .java ﬁles

20. Android SDK .java ﬁles

21. Android SDK .java ﬁles javac

22. Android SDK .java ﬁles javac

23. Android SDK .java ﬁles javac .class ﬁles

24. Android SDK .java ﬁles javac .class ﬁles

25. Android SDK .java ﬁles javac .class ﬁles dx

26. Android SDK .java ﬁles javac .class ﬁles dx

27. Android SDK .java files javac .class files .dex dx file

28. Android SDK .java files javac .class files .dex dx file

29. Android SDK .java files javac .class files .dex resou- dx file rces

30. Android SDK .java files javac .class files .dex resou- dx file rces

31. Android SDK .java files javac aapt .class files .dex resou- dx file rces

32. Android SDK .java files javac aapt .class files .dex resou- dx file rces

33. Android SDK .java files .apk file javac aapt .class files .dex resou- dx file rces

34. Android SDK .java files .apk file javac aapt .class files .dex resou- dx file rces

35. Android SDK .java adb files .apk file javac aapt .class files .dex resou- dx file rces

38. Android SDK .java adb files .apk file javac aapt .class files .dex resou- dx file rces 6

39. Android Development Components 7

40. Android Development Components Activity Text Text Done Cancel 7

41. Android Development Components Activity Service Text Text Done Cancel 7

42. Android Development Components Activity Service Broadcast- Receiver Text Text Done Cancel 7

43. Android Development Components Activity Service Broadcast- Receiver Text Text Done Cancel Intent 7

46. Littlebro http://github.com/thoraage/littlebro-android http://github.com/thoraage/jmx-rest-access 8

47. Overview Android Littlebro 9

48. Overview Android Littlebro Jetty / LIFT JMX REST Access 9

49. Overview Android Littlebro Jetty / LIFT JMX REST Access Glassﬁsh JMX 9

50. Demo 10

51. SBT • http://code.google.com/p/simple-build-tool/ 11

52. SBT • Command line • Maven source structure • Conﬁgured in Scala 12

57. Scala 101 Traits trait A { def a = "aaa" } trait B { def b = "bbb" } 14

58. Scala 101 Traits trait A { def a = "aaa" } trait B { def b = "bbb" } class C extends A with B { def c = "ccc" } 14

59. Scala 101 Traits trait A { def a = "aaa" } trait B { def b = "bbb" } class C extends A with B { def c = "ccc" } val c = new C println(c.a + c.b + c.c) 14

60. Scala 101 Traits trait A { def a = "aaa" } trait B { def b = "bbb" } class C extends A with B { def c = "ccc" } val c = new C println(c.a + c.b + c.c) 14

61. Scala 101 Traits trait A { def a = "aaa" } trait B { def b = "bbb" } class C extends A with B { def c = "ccc" } val c = new C println(c.a + c.b + c.c) aaabbbccc 14

62. Project class Littlebro(info: ProjectInfo) extends AndroidProject(info) with TypedResources with Eclipsify { override def androidPlatformName = "android-1.5" } 15

66. SBT & Android • http://github.com/jberkel/android-plugin 16

67. SBT & Android • http://github.com/jberkel/android-plugin scalac 16

68. SBT & Android • http://github.com/jberkel/android-plugin scalac 16

69. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles 16

70. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles 16

71. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles ProGuard 16

72. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles ProGuard 16

73. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles less .class ProGuard ﬁles 16

74. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles less .class ProGuard ﬁles 16

75. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles less .class ProGuard ﬁles dx 16

76. SBT & Android • http://github.com/jberkel/android-plugin scalac .class ﬁles less .class ProGuard ﬁles dx 16

77. SBT & Android • http://github.com/jberkel/android-plugin scalac ... .class ﬁles less .class ProGuard ﬁles dx 16

78. Demo 17

79. SBT & Idea • http://github.com/mpeltonen/sbt-idea-plugin • Hacked to work with sbt-android-plugin: http://github.com/thoraage/sbt-idea-plugin • Generates project ﬁles • SBT processor 18

80. SBT & Eclipse • http://github.com/musk/SbtEclipsify • Not tested with Android 19

81. Scala on Androids Quick wins 20

82. Resources Resource xml’s and R.java 21

83. Layout deﬁnition <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:a="http://schemas.android.com/apk/res/android" ...> <TextView a:text="@string/host_address_text" .../> <EditText a:id="@+id/hostAddress" .../> <Button a:id="@+id/login" a:text="@string/login_button_text" .../> </LinearLayout> 22

84. Layout deﬁnition <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:a="http://schemas.android.com/apk/res/android" ...> <TextView a:text="@string/host_address_text" .../> <EditText a:id="@+id/hostAddress" .../> <Button a:id="@+id/login" a:text="@string/login_button_text" .../> </LinearLayout> 22

85. R.java public final class R { ... public static final class id { public static final int login=0x7f050001; } ... public static final class string { public static final int login_button_text=0x7f040003; } } 23

88. R.java Button? public final class R { ... public static final class id { public static final int login=0x7f050001; } ... public static final class string { public static final int login_button_text=0x7f040003; } } 23

90. R.java usage • In java • Button login = (Button) findViewById(R.id.login); 24

93. R.java usage • In java • Button login = (Button) findViewById(R.id.login); • In Scala • val login = findViewById(R.id.login).asInstanceOf[Button] 24

96. TR.scala ... object TR { val login = TypedResource[android.widget.Button](R.id.login) } ... trait TypedActivityHolder { def activity: Activity def findView[T](tr: TypedResource[T]) = activity.findViewById(tr.id).asInstanceOf[T] } trait TypedActivity extends Activity with TypedActivityHolder { def activity = this } 25

102. TR.java usage • With TR.scala • val login = findView(TR.login) 26

103. Listeners 27

104. Listeners login.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { ... } } 28

105. Listeners login.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { ... } } login.setOnClickListener(new View.OnClickListener() { override def onClick(view: View) { ... } }) 28

106. Scala 101 Anonymous functions class Printer[A](list: List[A]) { def printSome(p: A => Boolean): Unit = for (elem <- list) if (p(elem)) println(elem.toString) } 29

111. Scala 101 Anonymous functions class Printer[A](list: List[A]) { def printSome(p: A => Boolean): Unit = for (elem <- list) if (p(elem)) println(elem.toString) } val printer = new Printer(List("yo", "doh", "hi")) printer.printSome { e => e.contains("o") } 29

116. Scala 101 Anonymous functions class Printer[A](list: List[A]) { def printSome(p: A => Boolean): Unit = for (elem <- list) if (p(elem)) println(elem.toString) } val printer = new Printer(List("yo", "doh", "hi")) printer.printSome { e => e.contains("o") } printer.printSome(_.contains("o")) 29

117. Scala 101 Anonymous functions class Printer[A](list: List[A]) { def printSome(p: A => Boolean): Unit = for (elem <- list) if (p(elem)) println(elem.toString) } val printer = new Printer(List("yo", "doh", "hi")) printer.printSome { e => e.contains("o") } printer.printSome(_.contains("o")) 29

118. Listeners def onClick(f: View => Unit) { setOnClickListener(new View.OnClickListener { override def onClick(v: View) = f(v) }) } 30

121. Listeners def onClick(f: View => Unit) { setOnClickListener(new View.OnClickListener { override def onClick(v: View) = f(v) }) } login.onClick { view => ... } 30

122. Scala 101 Implicit conversion class AmendedString(s: String) { def rot13 = new String(for (c <- s) yield rotC(c)) def rotC(c: Char) = (((c - 97) + 13) % 26 + 97).asInstanceOf[Char] } 31

125. Scala 101 Implicit conversion class AmendedString(s: String) { def rot13 = new String(for (c <- s) yield rotC(c)) def rotC(c: Char) = (((c - 97) + 13) % 26 + 97).asInstanceOf[Char] } new AmendedString("yodude").rot13 31

126. Scala 101 Implicit conversion class AmendedString(s: String) { def rot13 = new String(for (c <- s) yield rotC(c)) def rotC(c: Char) = (((c - 97) + 13) % 26 + 97).asInstanceOf[Char] } new AmendedString("yodude").rot13 implicit def string2amendedString(s: String) = new AmendedString(s) 31

130. Scala 101 Implicit conversion class AmendedString(s: String) { def rot13 = new String(for (c <- s) yield rotC(c)) def rotC(c: Char) = (((c - 97) + 13) % 26 + 97).asInstanceOf[Char] } new AmendedString("yodude").rot13 implicit def string2amendedString(s: String) = new AmendedString(s) "yodude".rot13 31

131. Scala 101 Implicit conversion class AmendedString(s: String) { def rot13 = new String(for (c <- s) yield rotC(c)) def rotC(c: Char) = (((c - 97) + 13) % 26 + 97).asInstanceOf[Char] } new AmendedString("yodude").rot13 implicit def string2amendedString(s: String) = new AmendedString(s) "yodude".rot13 31

132. Scala 101 Implicit conversion class AmendedString(s: String) { def rot13 = new String(for (c <- s) yield rotC(c)) def rotC(c: Char) = (((c - 97) + 13) % 26 + 97).asInstanceOf[Char] } new AmendedString("yodude").rot13 implicit def string2amendedString(s: String) = new AmendedString(s) "yodude".rot13 lbqhqr 31

133. Listeners class AmendedView(view: View) { def onClick(f: View => Unit) { view.setOnClickListener(new View.OnClickListener { override def onClick(v: View) = f(v) }) } } 32

138. Listeners class AmendedView(view: View) { def onClick(f: View => Unit) { view.setOnClickListener(new View.OnClickListener { override def onClick(v: View) = f(v) }) } } implicit def view2AmendedView(view: View) = new AmendedView(view) 32

143. Listeners class AmendedView(view: View) { def onClick(f: View => Unit) { view.setOnClickListener(new View.OnClickListener { override def onClick(v: View) = f(v) }) } } implicit def view2AmendedView(view: View) = new AmendedView(view) login.onClick { view => ... } 32

144. Concurrency 33

145. Responsiveness • Separate work and GUI GUI thread 34

146. Responsiveness • Separate work and GUI GUI thread 34

147. Responsiveness GUI thread worker Start worker 35

148. Responsiveness new AsyncTask[Object, Void, Object]() { override def doInBackground(objects: Object*): Object = { ... do hard work } }.execute() 36

154. Responsiveness GUI thread worker Start worker Update GUI 37

155. Responsiveness runOnUiThread(new Runnable() { def run: Unit = { ... update GUI } }) 38

160. Responsiveness new AsyncTask[Object, Void, Object]() { override def doInBackground(objects: Object*): Object = { ... do hard work runOnUiThread(new Runnable() { def run: Unit = { ... update GUI } }) } }.execute() 39

169. Responsiveness new AsyncTask[Object, Void, Object]() { override def doInBackground(objects: Object*): Object = { ... do hard work onUiThread { ... update GUI } } }.execute() 40

170. Responsiveness asyncTask { ... do hard work onUiThread { ... update GUI } } 41

171. Further 42

172. Actors Organizing with asynchronous message passing 43

173. Scala 101 Actors object MyActor extends Actor { def act { loop { react { case msg:String => println(msg) case other => println("Say what") } } } start } 44

187. Scala 101 Actors object MyActor extends Actor { def act { loop { react { case msg:String => println(msg) case other => println("Say what") } } } start } MyActor ! "Yo dude" 44

191. Scala 101 Actors object MyActor extends Actor { def act { loop { react { case msg:String => println(msg) case other => println("Say what") } } } start } MyActor ! "Yo dude" Yo dude 44

192. Actors GUI Connection Model Factory ViewStack href, (xml, error) httperror, none xml, (model, error) xmlerror, none model, (model) model, none 45

207. Actors case class Routing(success: Option[Actor], failure: Option[Actor]) case class HttpRequestMsg(href: URL, routing: Routing) 46

218. Actors case class Routing(success: Option[Actor], failure: Option[Actor]) case class HttpRequestMsg(href: URL, routing: Routing) retrieveData.onClick { Connection ! new HttpRequestMsg( "http://s.no/dig/url", new Routing(Some(ModelFactory), Some(GUI))) } 46

231. Actor object Connection extends Actor { def retrieve(href: String): Either[Node, Failure] = Right(new Failure()) def act { loop { react { case HttpRequestMsg(href, Routing(success, failure)) => retrieve(href) match { case Left(node) => success.map(_ ! node) case Right(error) => failure.map(_ ! error) } case _ => println("Say what") } } } start } 47

244. Androids on Scala Fini @thoraageeldby 48

Scala on androids

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