Add public api BluetoothSocket.isConnected.

It's a convenent function to get the connection status of the bluetooth
socket, ie, whether there is an active connection with remote device.
bug 2149043

Change-Id: I4ca4e98c646f70746d838632f3035376b22d579b
1 file changed
tree: 7b5d5980fe4e9d1041fe4107382717c9b51e2527
  1. framework/