安裝git
下載Git
下載好後，一路next即可
安裝好後，開啟Git bash，進行配置
首先配置自己的身份
git config --global user.name "Name"
git config --global user.email "name@gmail.com"
檢查是否配置成功：
git config --global user.name
git config --global user.email
建立程式碼倉庫
倉庫是用於儲存版本管理所需資訊的地方，所有本地提交的程式碼都會被提交到程式碼倉庫中，如果有需要還可以再推送到遠端倉庫中。
若要為某專案建立程式碼倉庫，則在git bash中，進入該專案根目錄下，然後執行git init即可：
進入對應目錄，看到生成了一個.git隱藏資料夾，表示倉庫建立成功
如果想要刪除本地倉庫， 只需要刪除這個.git隱藏檔案即可
提交原生程式碼：
程式碼倉庫建立完成之後即可提交程式碼，提交程式碼只需要使用add和commit兩個命令即可
- add命令用於新增想要提交的程式碼
- commit則是真正去執行提交操作
git add build.gradle
// 新增app目錄
git add app
// 新增所有檔案
git add .
現在本地倉庫內的所有檔案都已經新增好了，可以進行一次提交了，執行如下命令：
git commit -m "First commit"
注意：在commit命令之後，我們一定需要通過-m引數來加上提交的描述資訊，沒有描述資訊的提交被認為是不合法的。
執行完上條命令，所有的程式碼都已經成功提交了！
檢視修改內容
git status
在專案根目錄下執行 git status命令，就可以通過Git來檢視自上次提交後哪些檔案有變化
知道了哪些檔案有變化，要如何知道這些檔案具體變動了什麼呢？
需要用到git diff命令
git diff
如果需要知道具體某個檔案變動了什麼，
git diff + 檔名稱
例如：
git diff app/src/main/java/com/example/mosesmin/MainActivity.java
撤銷未提交也未新增的修改
如上文所述：
- 所謂提交，即執行了git commit命令
- 所謂新增，即執行了git add命令
要撤銷未提交也未新增的修改，用chekout命令
git checkout
例如，如果對app/src/main/java/com/example/mosesmin/MainActivity.java進行了修改，但是沒有執行git add命令新增它，就可以為其執行git diff命令
git diff app/src/main/java/com/example/mosesmin/MainActivity.java
執行了上述命令後，我們對MainActivity.java 這個檔案所做的修改就應該被撤銷了，我們重新執行一下git status命令，檢查一下，可以發現，專案中沒有任何可以提交的檔案，說明撤銷操作確實是成功了。
撤銷未提交已新增的修改
要撤銷未提交卻已新增的修改，先用reset命令執行一下，取消新增；再執行一遍checkout命令，執行撤銷。
如果一個檔案已經執行了新增操作
git reset
檢視提交記錄
檢視提交記錄，使用git log命令
git log
如果提交記錄很多，可以在命令中制定id，並加上 -1引數，表示我們只想看到一條記錄，如下所示：
git log 提交記錄id號 -1
如果想要檢視查詢的這條提交記錄中具體修改了什麼內容，可以在命令中加入 -p引數，命令如下所示：
git log 提交記錄id號 -1 -p
查詢的結果中，減號代表刪除的部分，加號代表增加的部分
分支的用法
回顧一下上文，如果需要對某專案進行建立倉庫和提交專案專案程式碼到倉庫，則執行下述命令
git init
git add .
git commit -m "First Commit"
分支的概念：
分支是版本控制中比較高階且比較重要的一個概念，它主要的作用就是在現有程式碼的基礎上開闢一個分叉口，使得程式碼可以在主幹線和分支線上同時進行開發，且相互之間不受影響。
分支的工作原理示例圖如下：
使用git branch命令檢視分支
如果要建立分支，例如執行如下命令：
git branch version1.0
如果是在master分支下，則執行：
git branch -m version1.0
版本庫的切換：
與遠端版本庫協作--例如與Github上的倉庫協作
去Github上建立一個倉庫（詳細的建立過程這裡不介紹了，不會可以度娘）：AndroidProgramming3eMm
建立完成之後的快速指南頁面：Quick setup
看到官方推薦的在本地建立新倉庫並與Github上AndroidProgramming3eMm倉庫關聯的操作的步驟，我在每個步驟後加了註釋：
echo "# AndroidProgramming3eMm" >> README.md
git init // 建立倉庫，把這個目錄變成Git可以管理的倉庫
git add README.md // 檔案新增到倉庫
git commit -m "first commit" //把檔案提交到倉庫
git branch -M main // 建立分支
git remote add origin https://github.com/mosesmindev/AndroidProgramming3eMm.git // 將本地倉庫與遠端倉庫相關聯
git push -u origin main /把本地庫的所有內容推送到遠端庫上
看到其中涉及分支的命令：
git branch -M main
其實以前的命令是：
git branch -m master
之所以github官方有修改，是近年來西方左派的政治正確導致的，特別是2020年的黑命貴運動等，master主人的意思對黑人不友好，所以改為了main主要
我們這裡分支沿用：git branch -m master
最後一步推送到遠端庫：git push -u origin master
如果本地已經有了倉庫，與Github上AndroidProgramming3eMm倉庫關聯的操作的步驟：
git remote add origin https://github.com/mosesmindev/AndroidProgramming3eMm.git
git branch -M main
git push -u origin main
我們本地已經有了倉庫，所以操作步驟如下：
git branch -m master //其實也不用這步，因為我們使用Git bash預設的倉庫分支就是master
git remote add origin https://github.com/mosesmindev/AndroidProgramming3eMm.git
git push -u origin master // 暫時不確認-u引數的含義
但是我們發現執行 git push -u origin master 後上傳程式碼並沒有成功，出現瞭如下報錯資訊：
$ git push -u origin master
error: src refspec master does not match any
error: failed to push some refs to 'https://github.com/mosesmindev/AndroidProgramming3eMm.git'
因為我們沒有對Github賬戶設定SSH key
為Github賬戶設定SSH key
cd ~/.ssh //檢視C:\Users\使用者名稱.ssh 是否有key
ssh-keygen -t rsa -C "PeterChenjinxu@outlook.com" // 如果沒有要自己生成
如上圖，我們得到提示：
Your identification has been saved in /c/Users/HONOR/.ssh/id_rsa
Your public key has been saved in /c/Users/HONOR/.ssh/id_rsa.pub
表示我們成功生成了key，路徑為：/c/Users/HONOR/.ssh/id_rsa.pub，HONOR為使用者名稱，具體到您自己的使用者名稱下查詢；我們在該目錄下用記事本或其他文字編輯器開啟
id_rsa.pub，的到ssh key公鑰。
如下圖，我們使用SublimeText開啟id_rsa.pub
之後，切換到github網站，展開個人頭像的小三角，點選settings
然後開啟SSH and GPG keys選單
點選New SSH key新增金鑰
填上標題，建議跟倉庫名稱 AndroidProgramming3eMm 保持一致吧，方便日後區分；接著將id_rsa.pub檔案中key貼上到此，最後點選Add SSH key生成金鑰吧
建立成功：
如此，github賬號的SSH keys配置完成。
上傳專案到Github
如果已經設定了SSH key，此時執行git push依然出現下圖問題，可能是本地倉庫為空（注意咯：git是不能管理空的資料夾的，資料夾裡必須有檔案才能add），或者本地倉庫沒有正確的專案導致的
我們在本地倉庫AndroidProgramming3eMm下拷貝一個用Android Studio的標準Android專案GeoQuiz
GeoQuiz結構如下：
然後我們執行相關的命令：
git init // 建立倉庫,初始化建立成功後你會發現專案裡多了一個隱藏資料夾.git，這個目錄是Git用來跟蹤管理版本庫的，一般不要動
git add . // 接著，將所有檔案新增到倉庫
怕上圖中的warning壞事兒，可以再git add一次
git commit -m "001 first commit by MosesMin" //然後，把檔案提交到倉庫，雙引號內是提交註釋
git remote add origin https://github.com/mosesmindev/AndroidProgramming3eMm.git // 關聯Github上建立的倉庫AndroidProgramming3eMm
git push -u origin master // 上傳原生程式碼到Github上建立的倉庫AndroidProgramming3eMm
到此，原生程式碼已經推送到github倉庫了，見證成功的時刻到了，我們現在去githubt倉庫看看：
剛建立的空專案是這樣的：
重新整理一下頁面，見證成功的時刻來臨了，我們的提交註釋和提交的本地倉庫內容都在了
copy記錄一下整個過程：
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm
$ git init
Initialized empty Git repository in E:/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm/.git/
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$ git add.
git: 'add.' is not a git command. See 'git --help'.
The most similar command is
add
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$ git add .
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.gitignore.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.idea/compiler.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.idea/copyright/profiles_settings.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.idea/encodings.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.idea/gradle.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.idea/misc.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.idea/modules.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/.idea/runConfigurations.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/.gitignore.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/build.gradle.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/proguard-rules.pro.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/androidTest/java/com/bignerdranch/android/geoquiz/ExampleInstrumentedTest.java.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/AndroidManifest.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/java/com/bignerdranch/android/geoquiz/QuizActivity.java.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/res/layout/activity_quiz.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/res/values-w820dp/dimens.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/res/values/colors.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/res/values/dimens.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/res/values/strings.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/main/res/values/styles.xml.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/app/src/test/java/com/bignerdranch/android/geoquiz/ExampleUnitTest.java.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/build.gradle.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/gradle.properties.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/gradle/wrapper/gradle-wrapper.properties.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/gradlew.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/GeoQuiz/settings.gradle.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in 01_FirstApp/LICENSE.txt.
The file will have its original line endings in your working directory
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$ git add .
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$ git commit -m "001 first commit by MosesMin"
[master (root-commit) db96b62] 001 first commit by MosesMin
35 files changed, 843 insertions(+)
create mode 100644 01_FirstApp/.DS_Store
create mode 100644 01_FirstApp/GeoQuiz/.gitignore
create mode 100644 01_FirstApp/GeoQuiz/.idea/compiler.xml
create mode 100644 01_FirstApp/GeoQuiz/.idea/copyright/profiles_settings.xml
create mode 100644 01_FirstApp/GeoQuiz/.idea/encodings.xml
create mode 100644 01_FirstApp/GeoQuiz/.idea/gradle.xml
create mode 100644 01_FirstApp/GeoQuiz/.idea/misc.xml
create mode 100644 01_FirstApp/GeoQuiz/.idea/modules.xml
create mode 100644 01_FirstApp/GeoQuiz/.idea/runConfigurations.xml
create mode 100644 01_FirstApp/GeoQuiz/app/.gitignore
create mode 100644 01_FirstApp/GeoQuiz/app/build.gradle
create mode 100644 01_FirstApp/GeoQuiz/app/proguard-rules.pro
create mode 100644 01_FirstApp/GeoQuiz/app/src/androidTest/java/com/bignerdranch/android/geoquiz/ExampleInstrumentedTest.java
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/AndroidManifest.xml
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/java/com/bignerdranch/android/geoquiz/QuizActivity.java
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/layout/activity_quiz.xml
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/mipmap-hdpi/ic_launcher.png
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/mipmap-mdpi/ic_launcher.png
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/mipmap-xhdpi/ic_launcher.png
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/values-w820dp/dimens.xml
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/values/colors.xml
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/values/dimens.xml
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/values/strings.xml
create mode 100644 01_FirstApp/GeoQuiz/app/src/main/res/values/styles.xml
create mode 100644 01_FirstApp/GeoQuiz/app/src/test/java/com/bignerdranch/android/geoquiz/ExampleUnitTest.java
create mode 100644 01_FirstApp/GeoQuiz/build.gradle
create mode 100644 01_FirstApp/GeoQuiz/gradle.properties
create mode 100644 01_FirstApp/GeoQuiz/gradle/wrapper/gradle-wrapper.jar
create mode 100644 01_FirstApp/GeoQuiz/gradle/wrapper/gradle-wrapper.properties
create mode 100644 01_FirstApp/GeoQuiz/gradlew
create mode 100644 01_FirstApp/GeoQuiz/gradlew.bat
create mode 100644 01_FirstApp/GeoQuiz/settings.gradle
create mode 100644 01_FirstApp/LICENSE.txt
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$ git remote add origin https://github.com/mosesmindev/AndroidProgramming3eMm.git
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$ git push -u origin master
fatal: unable to access 'https://github.com/mosesmindev/AndroidProgramming3eMm.git/': OpenSSL SSL_read: Connection was reset, errno 10054
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$ git push -u origin master
Enumerating objects: 72, done.
Counting objects: 100% (72/72), done.
Delta compression using up to 16 threads
Compressing objects: 100% (44/44), done.
Writing objects: 100% (72/72), 90.81 KiB | 12.97 MiB/s, done.
Total 72 (delta 0), reused 0 (delta 0), pack-reused 0
To https://github.com/mosesmindev/AndroidProgramming3eMm.git
* [new branch] master -> master
branch 'master' set up to track 'origin/master'.
HONOR@MosesMin-HonorMagicbook16pro2021 MINGW64 /e/DownloadFiles/BaiduNetdiskDownload/AndroidStudy/00 PDF/AndroidProgramming3eMm (master)
$
參考：
1、郭霖大牛的《Android第一行程式碼 第二版》
2、將本地專案上傳到github，git操作詳細指導，不看後悔深度好文！