Android Failed to install HelloWorld.apk on device (null) Error

Try changing the ADB connection timeout. I think it defaults that to 5000ms and I changed mine to 10000ms to get rid of that problem. If you are in Eclipse, you can do this by going through Window -> Preferences and then it is in DDMS under Android.

As described here: Android error: Failed to install *.apk on device *: timeout

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