title: Android Google Map api v2 night mode
body: <p>I am developing an Android application which is using full screen Google map (API 2)
  The driver which is using my application would like to have the "night mode" between 10PM and 6AM for example. </p>
  
  <p>Is this possible in Android ? To change the map mode to "night", similar with the Navigation Map application night mode which already exists in Android phones ?</p>
  
  <p>Thanks</p>