git已经添加到仓库中的文件无法直接使用.gitignore来进行忽略，需要先清理git缓存，再重新add，此时git才会按照.gitignore的规则对文件进行筛选，操作如下：

git -r --cached .

git add .

然后继续commit和push操作即可

附常用.gitignore忽略文件写法：

# 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

# Keystore files

*.jks