java - Using variable to specify the R object -


i'm new java. pardon me asking such simple question.

to set background-image of view, can by

int thebutton = r.drawable.button1;    button.setbackgroundresource(thebutton);

but how can done if want use variable specify r object?

int = 1; int thebutton = r.drawable["button"+a]; //this i'll in javascript...   button.setbackgroundresource(thebutton);

try : 

         string variable="button" + a;          int button = getresources().getidentifier(variable, "drawable",  getpackagename());           //whatever want do..

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