Android Studio / Gradle .gitignore, with exclusions for eclipse, maven and ant as well.

Android .gitignore

#==== Android Studio / Gradle
 
# built application files
*.apk
*.ap_
 
# files for the dex VM
*.dex
 
# Java class files
*.class
 
# Generated files
bin/
gen/
out/
build/
.gradle/
 
# Project files
*.iml
.idea
/.idea/workspace.xml
 
# Local configuration file (sdk path, etc)
local.properties
keystore.properties
/local.properties
 
# Other
.DS_Store
tmp
 
# Idea non-crucial project fileS
*.iws
 
 
#==== Others
 
# Eclipse
.project
.classpath
.settings
.checkstyle
 
# Maven
target
release.properties
pom.xml.*
 
# Ant
bin
gen
build.xml
ant.properties
proguard.cfg
proguard-project.txt