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Android is an important target for JVM languages. Clojure should run well there


  • Figure out what works and what doesn't
    • find it and write it up
  • Fast startup
  • Small footprint
    • Selectively strip metadata?


  • Needs a motivated owner
  • Be careful not to compromise Clojure for base and other platforms in making Android work well
  • Will we need some sort of conditional compilation?


  • Works out of the box with 1.2.0+
    • But only with API level 8 (FroYo/2.2) and above
    • API level 7 (Eclair/2.1) works if a work-around can be added for this bug
    • API level 6 and lower fail during verification due to the bean function.  Given that market share of these platforms is less than 10% and falling, probably a low priority to fix it.
  • Startup time is a little sluggish, but not too bad
  • The bean function causes some unnecessary GC and load time
  • zip, xml, and set loading in add 1-2 seconds on to the load time (fixed)
  • Average load time for a hello world app on stock clojure is 8-9 seconds using my macbook pro and the android emulator running Froyo
  • Average load time for a hello world app drops to around 5 seconds with the bean function removed and zip, set, and xml removed from the load in
  • Clojure adds =~ 4MB of overhead on application size (without any metadata stripped)
    • Standard Hello Android on Java: 20.01KB
    • Standard Hello Android on Clojure: 4.21MB
    • Can be reduced using ProGuard to strip out unused namespaces.
    • However, namespaces are cannot be broken up.
  • Dynamic compilation
    • It is possible to add, but it is slow
    • Some forms fail to compile due to excessive stack use, e.g.