Android external library R class not loading -


i added expandable-menu-button got github , .jar library search.maven.org android project when try build , run project, error below:

e:\xdroid\appname\libs\expandable-button-menu-1.0.0-sources.jar(lt/lemonlabs/android/expandablebuttonmenu/expandablemenuoverlay.java):56: error: package r not exist         typedarray = context.gettheme().obtainstyledattributes(attrs, r.styleable.expandablemenuoverlay, 0, 0);                                                                          ^ e:\xdroid\appname\libs\expandable-button-menu-1.0.0-sources.jar(lt/lemonlabs/android/expandablebuttonmenu/expandablemenuoverlay.java):58: error: package r not exist             madjustviewsize = a.getboolean(r.styleable.expandablemenuoverlay_adjustviewsize, true);                                             ^ e:\xdroid\appname\libs\expandable-button-menu-1.0.0-sources.jar(lt/lemonlabs/android/expandablebuttonmenu/expandablemenuoverlay.java):59: error: package r not exist             dimamount = a.getfloat(r.styleable.expandablemenuoverlay_dimamount, default_dim_amount);

what doing wrong such r.java file unavailable , how can correct it? in advance.


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