Cannot resolve MapActivity class on Android

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The problem is that your MapVis class is likely extending com.google.android.maps.MapActivity. For the system to be able to find this class you need to do two things:

First make sure your project is including the Android maps.jar in your build path. From Eclipse find 

Project > Properties > Android

Then select one of the “Google APIs” as appropriate for you app. You can confirm that maps.jar is on your build path by checking:

Project > Properties > Java Build Path > Libraries > Expand "Google Apis"

Second browse to your manifest file and make sure you have the uses-library snippet nested within the <application> tags as follows:

<manifest>
...
   <application ...>
      <uses-library android:name="com.google.android.maps" />
      ...
   </application>
</manifest>

May the force be with you!

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