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Android Build a Simple Android App (2014) Testing and Debugging Making a Toast

non-repeating random numbers "fan facts"

Hi , I completed the fan fact app here , but I want the random numbers not to repeat , and when I click a button , I need it to take a new string. If possible please show me the code how to do that , and where to put that code (for I am still a little bit confused ), i need the exact code and its place in the fan fact app. Thanks so much :)