80fb13753b
The current mechanism for traffic poller directly exposes the wifi service's internal message handler to privileged apps. Move away from this mechanism and expose an API to let apps register for callbacks from traffic poller. This API uses binder IPC for registration and invocation of callbacks. Clients are automatically removed on binder death. This will also let us mark WifiManager#getWifiMessenger() method private to prevent any apps from getting access to this internal messenger. Note: This is based on the existing SoftapCallback registration mechanism. Also, fixed a bunch of checkstyle errors that were not caught previously. Bug: 27074039 Test: Unit tests Test: Verified the data indicators on Sysui Change-Id: I505bd2398552be99ccca7b7d3c31a488aa72af70