java - How to perform one operation at time android? -


i making android calculator. made functions first problem double clickable operation.i tried couldn't. when click 2 operations consequently both appearing on text view. i'll post code if can solve double clickable operation problem please post code on comment.

public class mainactivity extends appcompatactivity {      private textview _screen;     private textview _result;     private string display = "";     private string currentoperator;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          _screen = (textview) findviewbyid(r.id.txtscreen);         _result = (textview) findviewbyid(r.id.id_result);     }      public void updatescreen() {         _screen.settext(display);     }      public void onclicknumber(view v) {         button b = (button) v;         display += b.gettext();         updatescreen();     }      public void onclickoperator(view v) {         button b = (button) v;         display += b.gettext();         currentoperator = b.gettext().tostring();         updatescreen();     }      public void clear() {         display = "";         currentoperator = "";     }      public void onclickclear(view view) {         clear();         updatescreen();     }      public double operate(string a, string op, string b) {         switch (op) {             case "+":                 return double.valueof(a) + double.valueof(b);             case "-":                 return double.valueof(a) - double.valueof(b);             case "*":                 return double.valueof(a) * double.valueof(b);             case "/":                 return double.valueof(a) / double.valueof(b);             default:                 return -1;         }     }      public void onclickequal(view v) {         string[] operation = display.split(pattern.quote(currentoperator));         _result.settext(string.valueof(operate(operation[0], currentoperator,  operation[1])));     } }

what understand question regarding double operation let suppose performing operation of + , when click again + gets displayed 2 times on textview (as method updatescreen suggest). if problem, can mentioned below

 public void updatescreen() {         if (screen.gettext().tostring().equalsignorecase("")) {             screen.settext(display);         } else if (!display.equalsignorecase(screen.gettext().tostring())) {             screen.settext("");             screen.settext(display);         } else {             //this case means operator set on text         }     }

hope helps you.


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