java - When using Google Billing in my app, do all of the necessary methods have to be used in the class that contains the paid content? -

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this may little difficult explain bare me...

i'm following google in-app purchases tutorial very vague in of instructions. have class (let's sound.java) contains sound files can played after user purchases them, considering how many lines of code required google connect billing services, need in 1 class, sound.java or can preload of methods in startup class?


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