title: "MapFragment cannot be resolved to a type" even though I am on API level 17
body: <p>I just started using MapFragments, and I can get the Map to show in my Activity. I just use a simple XML-layout, and it works as expected:</p>
  
  <p><img src="https://i.stack.imgur.com/TSQf0.png" alt="enter image description here"></p>
  
  <p>Now, I need to get the Fragment in code, so I can start interacting with the Map. This is where I run into problems:</p>
  
  <p><img src="https://i.stack.imgur.com/QmvTO.png" alt="enter image description here"></p>
  
  <p>As you can see, the MapFragment (or getFragmentManager) cannot be resolved to a type. I am targeting Android 4, API level 17:</p>
  
  <p><img src="https://i.stack.imgur.com/PoCXR.png" alt="enter image description here"></p>
  
  <p>and you can also see that I am referencing the Googke Play library.</p>
  
  <p>Here is the Manifest, just for clarity:</p>
  
  <p><img src="https://i.stack.imgur.com/GNj9h.png" alt="enter image description here"></p>
  
  <p><strong>So, the big question is: why can't I resolve MapFragment? What am I missing?</strong></p>
  
  <p>As a side note: SupportMapFragment seems to resolve OK, but that's not what I want.</p>