title: Blank Maps_Activity
body: <p>I am working on an app, where I open the map after click on a button. 
  I open a new activity (intent) and with that <code>"Maps_activity"</code> I set <code>"maps_layout"</code>.</p>
  
  <p>My Problem is, I get a blank maps, just see "GOOGLE"on the left bottom side:<a href="https://i.stack.imgur.com/SOFpo.png" rel="nofollow noreferrer">Blank Maps?!?</a></p>
  
  <p>1) I add: </p>
  
  <pre><code>compile 'com.google.android.gms:play-services:10.0.1' (my  buildToolsVersion is "24.0.3" - Compile SDK version 24)
  </code></pre>
  
  <p>2) I add maps layout from an other <code>maps-app</code>, which works. (I changed the context)</p>
  
  <p>3) I add meta-data and API-Key on manifest (and the <code>Maps_Activity</code> the activity works, opens the maps, just blank?)</p>
  
  <p>4) I add the API-Key in <code>release-</code> and <code>debug- google_maps_api.xml</code></p>