Cannot detect Sony Xperia in Eclipse

Question

I am totally new at testing apps on devices, especially the Sony Xperia. I am testing apps using the Android emulator, but I have now a Sony Xperia. First I have connected

Answer 1

This answer is more general to not finding your device. But if you have dead ADB processes running, you might have to kill them (and start a new one) in order to pick your device.