In the previous chapters, you have made your first steps within the custom ROMs world; we have discovered what's already available online and analyzed the most characteristic aspects in detail. In this chapter we will go in deep and learn how to modify the most internal parts of Android's framework.

Custom ROMs are often associated with those "hackers" who add the most unexpected features and then share everything online, but it doesn't always happen like that.

As explained in the previous chapters, many device manufacturers propose their own modified Android version, which is nothing but an Android custom ROM.

This is a very important aspect, as this book is addressed both to the previously mentioned hackers and to those who use all this knowledge in their daily work—a hacker will often work with binary ROM, and rarely with sources, while the professional will certainly have the sources at their disposal, as well as all the relevant tools to make the development...