Built application files
*.apk
*.ap_
Files for the ART/Dalvik VM
*.dex
Java class files
*.class
Generated files
bin/
gen/
out/
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/
Intellij
*.iml
.idea/workspace.xml
.idea/libraries
Keystore files
*.jks
gitignore修改无效的处理
.gitignore只能忽略那些原来没有被track的文件，如果某些文件已经被纳入了版本管理中，修改.gitignore是无效的。那么解决方法就是先把本地缓存删除（改变成未track状态），然后再提交
git rm -r --cached .
git add .
git commit -m 'update .gitignore'
