New answers tagged voice-command
It may be a "feature" that HTC builtin you might try looking around in the Bluetooth settings to see if there is any sort of thing about notification etc.
In Google Now, click the menu icon on the left of the search bar (it looks like a hamburger). Then choose Settings -> Voice -> "OK Google" Detection. (Click image to enlarge) Flip the three switches on. When you switch on the second one, the app will ask you to say "Okay Google" three times to train the voice model. Flipping the third switch on will ...
In Android, by default, you can't have access to Google Now when the phone is locked (maybe for security reasons), but there could be a lock screen widget for that. You can search for that.
Top 50 recent answers are included