: The official Google tool. It is highly optimized, supports the latest code, and integrates with historical records. AndroidXRef
For organizations or developers working on custom ROMs or private modifications, self-hosting an XRef engine is common: xref aosp
^void .*Start\([^)]*\) : Uses regular expressions to find specific method structures in C++ or Java. Setting Up Your Own Local AOSP Xref : The official Google tool