Use androidx.annotation.Nullable instead and optimize imports.

Test: atest -v CtsSeekerDiscoverProviderTest
BUG: 216079944
Change-Id: I56981da90c7fc9dba593ba33ee4e1783d2c89f67
6 files changed
tree: ced44bdd061ad475b0cf3d5bac797a152d7aeace
  1. nearby/