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要取得Android的原始碼，會需要用到Git和Repo還有Gerrit。 以下解釋一些工具，太冗長，可直接拉到最下方看如何取得Android原始碼。
什麼是Git?
Git is an open-source version-control system designed to handle very large projects that are distributed over multiple repositories.
那Git for Android是?
In the context of Android, we use Git for local operations such as local branching, commits, diffs, and edits. One of the challenges in setting up the Android project was figuring out how to best support the outside community–from the hobbiest community to large OEMs building mass-market consumer devices. We wanted components to be replaceable, and we wanted interesting components to be able to grow a life of their own outside of Android. We first chose a distributed revision control system, then further narrowed it down to Git.
