what programming languages does 2.2 officially support?

I know you can write apps in c, c++, and java. Howev开发者_如何学运维er I have heard that android also supports scheme, python, lua, and others but never could find it verified or an actual list.

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Here are some that I use on my (unrooted) 2.2 and 2.3 phones (plus pForth from the command line)

Market compilers and interpreters:

• BASIC!+SQL
• Light Basic
• CalcScipt (RPN)
• Clojure REPL
• Android Shell (Beanshell)
• JavaIDEdroid (Java)
• Andjedi (Java)
• Terminal IDE (Java)
• AIDL (Java)
• aDosBox (DOS languages via emulation)
• Android Logo
• Gambit (Scheme)
• GCC and G++ (via command line)
• Tiny C Compiler
• SpiderMonkey (command line javascript)
• Generate (javascript based graphical)
• Processing (javascript based)
• cat (javascript based functional RPN)
• Graphicalc (C interp)
• IProgram (Basic like)
• JoyToy (Basic like)
• Tiny Lisp ISLisproid
• Luarida (Lua)
• Mathscript
• Mobile BASIC
• Mobile Futon (couchdb+javascript server)
• OCaml toplevel for Android
• Pascal
• Pepe (Pascal compiler)
• Retro (javascript based Forth-like)
• Rubuto IRB (jRuby)
• SchemeREPL
• Scheme-droid
• Sharpoid (javascript based)
• Sigmascript (Lua)
• C# to go
• ScriptBlocks (visual,symPy based)
• i-Jetty (servlets using one of the Java compiler systems above)

The languages presently supported by SL4A are Beanshell, Rhino javascript, jRuby, perl,TCL, PHP, Python, ash, Lua, squirrel.

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It seems you are referring to the scripting layer for Android, here is what the Scripting Layer for Android site says about supported languages:

"Python, Perl, JRuby, Lua, BeanShell, JavaScript, Tcl, and shell are currently supported, and we're planning to add more."

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Officially, no

Unofficially, Scala, Scheme and others have modified runtimes and compilers to work on android. Those that compile/translate directly to dex opcodes without too big of 3rd party lib contained in the apk are of course better performance wise.