Making changes to a built-in Android apps

I've pulled and compiled the latest Android tree. Now I want to make changes to the Android's Browser application.

The environment in Eclipse is already set up. I tried creating the p开发者_运维百科roject by selecting "Build project from existing source", but it fails to build because it uses libraries not in the SDK.

Does anyone know how to import the missing source in order to build the Browser app, or even better, how to just copy the source into a separate project and use it like I was developing a regular application?

Does anyone know how to import the missing source in order to build the Browser app

That is not possible. The "missing source" is the operating system.

how to just copy the source into a separate project and use it like I was developing a regular application?

That too is not possible.

You cannot just grab an app out of the Android open source project and build it via the SDK. Some of the apps were first written before the SDK existed. Other apps rely upon APIs that, for various reasons, have not yet been exposed in the SDK.

You are welcome to make modifications to the Browser app. However, to build them, you need to use the build process for the firmware, not treat it as a regular SDK-based project.