Question

How to retrieve the contact name from incoming call number?

Answer 1

First you need to get the incoming caller number which you can manage with the help of below reference question:
Retrieve incoming call's phone number in Android

So once you have the number, you can use the below code to get the contact name:

Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneNumber));
resolver.query(uri, new String[]{PhoneLookup.DISPLAY_NAME} .....)