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Scala on Android: Experiences at Bump Technologies
This was a talk given at the Scala Days 2011 conference. It talks about how Scala is used on the Bump Android app.
Editor's Notes
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- #32 Example of some dense Scala code from Bump. Imagine what this would look like in Java.\n
- #33 That’s Indy driving. Michael is in the passenger seat. Obviously this picture was taken a few months ago when he had more hair.\n
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- #35 ADT and Scala plugins do not play well together. You can get them to not step on each other so much, but your life will still suck.\n
- #36 ADT and Scala plugins do not play well together. You can get them to not step on each other so much, but your life will still suck.\n
- #37 ADT and Scala plugins do not play well together. You can get them to not step on each other so much, but your life will still suck.\n
- #38 ADT and Scala plugins do not play well together. You can get them to not step on each other so much, but your life will still suck.\n
- #39 ADT and Scala plugins do not play well together. You can get them to not step on each other so much, but your life will still suck.\n
- #40 But wait, didn’t we pick Scala because of the promised developer productivity?\n
- #41 How we got our agility back\n
- #42 How we got our agility back\n
- #43 How we got our agility back\n
- #44 How we got our agility back\n
- #45 How we got our agility back\n
- #46 How we got our agility back\n
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- #48 Scalac compiler pukes on the Java code produced by the protocol buffers Java compiler, hence initial javac step. Pro Guard rips out Scala code from scala-library.jar that we don’t need. Dex is the Android compiler. It takes Java class files and produces Dalvik byte code.\n
- #49 Build everything, rip out app code, put the rest in a jar, and then use Eclipse/IntelliJ.\n
- #50 Android Parcelables require a public static field called PARCELABLE. A val in a companion object offers equivalent functionality, but is compiled into a method, not a field. Scala team hacked the compiler for Android as result: https://lampsvn.epfl.ch/trac/scala/changeset/22628\n
- #51 ~7M total downloads. 4 star rating. Featured on the Android Market. \n
- #52 Tricky to access non-static inner classes defined in Java, such as android.os.PowerManager.WakeLock\nCan’t send Scala collections between processes\nClosures -> Mystery classes -> Many allocations and leaked memory\nHard to debug crashes that happen on a line with multiple statements, closures, etc.\n
- #53 Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. Hiring. \n