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Android Build an Interactive Story App The Model-View-Presenter Pattern Creating the Story

Before we used (getString(R.string.key_name)); and now we are using (R.string.page0)?

before we used (getString(R.string.key_name)); to access a value from sting file and now we are using

    pages[0].setTextId(R.string.page0);

why? if now we use getString(R.string.page0) this creates an erorr.

please help and explain