android reject incoming call. work with sms

Question

Android

Tell me in which class are the methods for rejecting incoming calls, accepting them, and so on.

And which class is responsible for working with SMS (moving to draft, marking as read, etc.).

Answer 1

You can answer calls, and reset, and intercept text messages and send your own. Android is a great system! And you should better search on profile sites. For example stackoverflow.com/a/7121586/1616443 and here is stackoverflow.com/a/7171785/1616443 and there are a bunch of other posts about it.
BroadcastReceivers to help you!

Answer 2

You can't seem to turn down the call.
blog.wangling.me/2009/08/why-it-is-impossible-to-intercept-incoming-calls-on-android.html
For sms use contentprovider "content://sms/".