tree 0935ad4b34754126edc3650f9680a9a05469f536
parent 7cdc0f00ebcfc0ea0957e486df314c4cb0595822
author chen xu <fionaxu@google.com> 1537487196 -0700
committer chen xu <fionaxu@google.com> 1537998547 -0700

new System API for preferred network mode

1. new System API for getPreferredNetworkType
2. new System API for preferred network mode

Bug: 115894190
Test: unit test
Change-Id: I34b060d3f915f2c74b2b9412d03f849e9d037c0b
Merged-in: Ic108c484905f80783982a22e8152609257d684b5