Scripting Layer for Android (SL4A, formerly known as Android Scripting Environment or (ASE) brings scripting languages to Android by allowing you to edit and execute scripts and interactive interpreters directly on the Android device.

The Android Scripting Environment (ASE) brings scripting languages to Android by allowing you to edit and execute scripts and interactive interpreters directly on the Android device.These scripts have access to many of the APIs available to full-fledged Android applications, but with a greatly simplified interface that makes it easy to:

• Handle intents
• Start activities
• Make phone calls
• Send text messages
• Scan bar codes
• Poll location and sensor data
• Use text-to-speech (TTS)
• And more

Scripts can be run interactively in a terminal, in the background, or via Locale. Python, Perl, JRuby, Lua, BeanShell, JavaScript, Tcl, and shell are currently supported.

You may ask, why write scripts instead of real Android applications? Admittedly, Android's development environment makes life pretty easy, but you're tied to a computer to do your work. ASE lets you develop on the device itself using high-level scripting languages to try out your idea now, in the situation where you need it, quickly.