General Android gitignore file used as base for each new project

.gitignore

# built application files
*.apk
*.ap_

# files for the dex VM
*.dex

# Java class files
*.class

# generated files
bin/
gen/
out/
proguard_logs/
.navigation/

# exclude the Unity bin folder from .gitignore by adding exception
!assets/bin/

# exclude all __MACOSX directories
__MACOSX/

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

# Eclipse project files
.classpath
.project
.settings/
project.properties

# Proguard folder generated by Eclipse
proguard/

# Intellij project files
*.iml
*.ipr
*.iws
.idea/