一、前言
最近维护代码过程中，发现某APP代码库里被提交了许多临时文件，而这些临时文件每次都会变化，所以导致每次修改提交时候，都会出行他们的身影，非常烦人。其原因，很明显是没有包含.gitignore文件，楼下，就介绍加上.gitignore的方法。
二、发现提交的临时文件
如下，发现许多临时文件目录，如 .idea 被提交到了版本库，导致每次git status很难分清自己修改的文件，所以需要将它们去掉。
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PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting> git status .
On branch master_liebao
Your branch is up to date with 'origin/master_liebao'.
Changes to be committed:
(use "git restore --staged <file>..." to unstage)
modified: app/src/main/java/com/kingboard/vavatvsettings/activity/bluetooth/BluetoothDeviceManagerActivity.java
modified: app/src/main/java/com/kingboard/vavatvsettings/fragment/currency/MachineFragment.java
modified: app/src/main/res/values-zh-rCN/strings.xml
modified: app/src/main/res/values-zh-rTW/strings.xml
modified: app/src/main/res/values/strings.xml
modified: app/src/main/res/xml/menu_child_currency_machine.xml
Changes not staged for commit:
(use "git add/rm <file>..." to update what will be committed)
(use "git restore <file>..." to discard changes in working directory)
modified: .gradle/6.1.1/executionHistory/executionHistory.bin
modified: .gradle/6.1.1/executionHistory/executionHistory.lock
modified: .gradle/6.1.1/fileHashes/fileHashes.bin
…… 省略 ……
modified: .idea/modules/settingframework/VAVATvSettings.settingframework.main.iml
modified: .idea/modules/settingframework/VAVATvSettings.settingframework.unitTest.iml
modified: app/build.gradle
modified: local.properties
三、去掉临时文件的方法
3.1 添加.gitignore
文件 .gitignore内容如下 ，将需要排除的文件、文件夹添加进入
*.iml
.gradle
.idea
.DS_Store
/build
/captures
.externalNativeBuild
.cxx
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting> git add .gitignore
3.2 删除临时文件缓存
如本案例，许多临时文件已经被提交到版本库，所以要将他们删除
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting> git rm -r --cached .gradle
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting> git rm -r --cached .idea
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting> git commit -m "add .gitignore"
可见删除打印/提交打印：
rm '.idea/.gitignore'
rm '.idea/.name'
…… 省略 ……
rm '.idea/modules/settingframework/VAVATvSettings.settingframework.iml'
rm '.idea/modules/settingframework/VAVATvSettings.settingframework.main.iml'
rm '.idea/modules/settingframework/VAVATvSettings.settingframework.unitTest.iml'
rm '.idea/vcs.xml'
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting> git commit -m "add .gitignore"
[master_liebao d0ddbcc] add .gitignore
112 files changed, 14 insertions(+), 2522 deletions(-)
create mode 100644 .gitignore
…… 省略 ……
delete mode 100644 .idea/modules/settingframework/VAVATvSettings.settingframework.main.iml
delete mode 100644 .idea/modules/settingframework/VAVATvSettings.settingframework.unitTest.iml
delete mode 100644 .idea/vcs.xml
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting>
3.3 添加后的效果
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting> git status
On branch master_liebao
Your branch is ahead of 'origin/master_liebao' by 1 commit.
(use "git push" to publish your local commits)
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git restore <file>..." to discard changes in working directory)
modified: app/build.gradle
modified: gradle.properties
PS C:\Users\66176\Documents\works\mt9652\all_app\mtvsetting>
