Add and maintain your own Android .gitignore

Feel free to use mine in the meantime: https://gist.github.com/3240022

# built application files
*.apk
*.ap_
*.jar

# keystore
*.keystore

# files for the dex VM
*.dex

# Java class files
*.class

# generated files
bin/
gen/

# maven output folder
target

# Local configuration file (sdk path, etc)
local.properties

# Eclipse project files
.classpath
.project
.metadata
.settings

# IntelliJ files
.idea
*.iml

# OSX files
.DS_Store

# Windows files
Thumbs.db

# vi swap files
*.swp

# backup files
*.bak

# maven eclipse files
.externalToolBuilders
maven-eclipse.xml