在协同开发Android项目时，一般要忽略以下文件

# Built application files
*.apk
*.ap_

# Files for the Dalvik VM
*.dex

# Java class files
*.class

# Generated files
bin/
gen/

# Gradle files
.gradle/
build/

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

# Proguard folder generated by Eclipse
proguard/

# Log Files
*.log

# Android Studio Navigation editor temp files
.navigation/

# Android Studio captures folder
captures/

# OSX hidden files
.DS_Store

# Windows hidden files
Thumbs.db

如果是在OSX系统下开发，还要忽略.DS_Store文件（如果开启了显示隐藏文件选项），同理Windows下也要忽略一些常见的隐藏文件，如Thumbs.db等