Never mind, I found it in the source: base.git/core/res/res and subdirectories.
As others said in the comments, if you have the Android SDK installed it’s also on your computer. The path is [SDK]/platforms/android-[VERSION]/data/res.
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
