回答这些和许多其他问题，现在可以在Android开源项目网站上找到：

The answers to these and many other questions can now be found on the Android Open Source Project web site:

Android系统级显卡

的文件与低级别的基础设施的说明开始，然后解释了更高级别的特征是如何从他们构建的。我们的目标是不提供直接的常见问题的答案，而是描述系统的详细程度，使明显的答案没有被压倒。

The document begins with an explanation of the low-level infrastructure, and then explains how the higher-level features are built from them. The goal is not to provide direct answers to common questions, but rather to describe the system at a level of detail that makes the answers apparent without being overwhelming.

材料和详细程度的选择是重用Q＆放大器的影响;对计算器A

The choice of material and level of detail were heavy influenced by Q&A on ***.

（从技术上讲，这是一个链接，唯一的答案，但在这里写10000字似乎是个好主意。）

(Technically this is a link-only answer, but writing 10,000 words here seemed like a bad idea.)