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.

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.

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."

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.