Pretty standard/complete .gitignore with focus on Android

.gitignore

# Local files
/local.properties
/build
/captures

# Built application files
*.apk
*.ap_

# Files for the Dalvik VM
*.dex

# Java class files
*.class

# Generated files
bin/
gen/

# Gradle files
.gradle/
./gradlew.bat
./gradlew
build/

# Mirror files
mirror/

# Local configuration file (sdk path, secret varables, etc)
local.properties
gradle.properties
google-services.json

# Proguard folder generated by Eclipse
proguard/

# Intellij project files
*.iws
.idea/
*.iml
 
# OS
.DS_Store