android - How Can I put a error msg if there is a blank field on Java? -

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i trying make unit converter , seems working need give them error if don't put number on first field , other error if put number on second field (so cant convert backwards)

public class mainactivity extends activity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          final edittext editcentimeters = (edittext) findviewbyid(r.id.editcentimeters);          final edittext editinches = (edittext) findviewbyid(r.id.editinches);          button buttonconvert = (button)findviewbyid(r.id.buttonconvert);          buttonconvert.setonclicklistener(new onclicklistener() {              @override             public void onclick(view arg0) {                  double centimeters = double.valueof( editcentimeters.gettext().tostring());                  double inches = centimeters *  0.393700787 ;                  editinches.settext(string.valueof(inches));              }         });        }  }

use seterror() method this. somthing this

buttonconvert.setonclicklistener(new onclicklistener() {          @override         public void onclick(view arg0) {              if(editcentimeters.gettext().tostring().equals("")){                   editcentimeters.seterror("*field required");               }else{              double centimeters = double.valueof( editcentimeters.gettext().tostring());              double inches = centimeters *  0.393700787 ;              editinches.settext(string.valueof(inches));             }          }     });

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