I've no idea what 64bit should have to do with the APK as Android is 32bit, but anyway...seems to be a problem with your setup to me. RGBColor is simply the first class that it tries to instantiate when initiliazing the class. Make sure that the jpct.jar is actually part of your APK. If you create it by using Eclipse, make sure that you link to the jar instead of configuring a user library for that or linking to another project that contains it. In both cases, the jar won#t be included in your APK.