What does it mean to be familiar with the Android framework layer in Android recruitment? What specifically refers to the content of Android?

The specific work of the framework is to provide a series of services and API interfaces for developers of android application development.

You can download the source code, compile it and transplant it to the development board smoothly. "Your experience is in line with the requirements. The "Android framework" written in the recruitment information should refer to /frameworks/base, most of which are Java codes. It seems that they are making Android devices, and manufacturers usually transplant them, and then they may add their own extension functions to the framework and the whole platform according to the characteristics of their products.