How do I create a home-screen replacement application? Is there any information about the home-screen application available?
Can any application be a home-screen by just registering it with a CATEGORY_HOME
intent?
Writing your own home screen application is possible. It is called the Launcher.
You can get the source code of the default Android Launcher via Git.
The project URL is:
https://android.googlesource.com/platform/packages/apps/Launcher2.git
You can get the source code like this:
git clone https://android.googlesource.com/platform/packages/apps/Launcher2.git
That will create a directory called Launcher2 for you. Now you can get cracking and create your custom launcher.
If you need help with using Git then checkout Git's documentation section.