android - How to Change String to a Double? -

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i have created small program allows users enter numeric values edittext.

  • when click button first time, app should display in textview
  • after should save new value if greater previous value

help me please.

public class bidactivity extends activity implements onclicklistener {     public textview tt;     public edittext textbo;     public string total;     public button btnnn;     public double protein;     double price = 0;      /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);         setcontentview(r.layout.main);          textbo = (edittext)findviewbyid(r.id.txtbid);         tt = (textview)findviewbyid(r.id.textview1);          btnnn = (button)findviewbyid(r.id.btnbit);         btnnn.setonclicklistener(this);     }      @override     public void onclick(view v) {         // todo auto-generated method stub         string total = textbo.gettext().tostring();         price = double.parsedouble(textbo.gettext().tostring());          //tt.settext("double: "+price);         if(double.parsedouble(textbo.gettext().tostring()) < price){             tt.settext("double: "+price);         }else{             tt.settext("double: "+double.parsedouble(textbo.gettext().tostring()));         }        } }

i'm guessing trying this:

double price = 0; double savedprice = 0.0; ...  @override public void onclick(view v) {     price = double.parsedouble(textbo.gettext().tostring());      if(savedprice < price){         tt.settext("double: "+price);         savedprice = price;     }     // otherwise leave tt }

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