Source code of android messaging

I am planning to create an applic开发者_开发技巧ation which the user can put security to their SMS. Is there a possibility for me to see the source code of the Messaging of Android phone? How?

Android source code is also mirrored on Github. The SMS/MMS package can be found on: https://github.com/android/platform_packages_apps_mms

See https://android.googlesource.com/platform/packages/apps/Mms for the Android Messaging app.

I found this class on Grep Code. You can look around and see if it works for you. However, for anything related to SMS, you probably do not need to change the source code, just intercept calls at appropriate places !