I am using a PlacePicker library from Google Play Services which starts up a new activity. The new activity/picker has a toolbar (actionbar) which is not styled by default.<
This is an acknowledged issue by the development team.
There is currently a known issue with setting custom theme colors on the PlacePicker. For now you can work around this by defining two colors with the names "primary" and "primary_dark" - these will be applied to the PlacePicker.
Unfortunately setting the primary/primaryDark property on a theme will not affect the PlacePicker styling at the moment.
EDIT: Seems to be fixed now.
This should be fixed in Google Play Services 10.0. Place Picker and Autocomplete Widget will use the colorPrimary and colorPrimaryDark colors from your app.