I have an application which has 11 different activities. One of these activities is an extension of MapActivity (it is a map for data visualization). To get to this activi
I update cyber-monk answer because the problem is not that you do not have maps.jar, the problem is that you have conflicting jar (e.g you mix maps.jar with android 4.0). So
Project > Properties > Android. If that not the case select it and click on apply. This change will modify the target property in the file project.properties and change the included libraries. (e.g with the latest android sdk, you will have: target=Google Inc.:Google APIs:14)Project > Properties > Java Build Path > Libraries and ensure that there is no android.jar or maps.jar directly included. You should only have Google Apis with at least maps.jar and android.jar as leaves.