1. 安裝 repo

   curl https://storage.googleapis.com/git-repo-downloads/repo > /usr/bin/repo chmod a+x /usr/bin/repo

2. 建立文件夾下載程式碼

   mkdir andorid_source cd andorid_source repo init -u https://android.googlesource.com/platform/manifest repo sync

參考 : Downloading the Source