标准的 Java 项目 .gitignore 可以参考如下：

# built application files
*.apk
*.ap_

# files for the dex VM
*.dex

# Java class files
*.class

# generated files
/bin/
/gen/

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

# Eclipse project files
.classpath
.project
.settings/

# Proguard folder generated by Eclipse
proguard/

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

# Maven
/log/
target/
/target/