Catch NoSuchMethodError exception around BluetoothSocket.isConnected().
Remoted unnecessary comment.
Merge branch 'pr/87' into next
Replace tabs with 4 spaces.
Make sure trace source preferences are initialized in legacy layout.

Fixed #74.
Merge branch 'next' into integrated-dashboard
Merge branch 'integrated-dashboard' of https://github.com/openxc/openxc-android into integrated-dashboard