android - Accessing the global value outside function -

i'm trying set value(global) in function , access outside function in "on create()" in android i've tried making global variable static, , tried write in "edit text" , parsing in "on create()" . keeps initializing 0.0 (the variable double type) when tried access in "on create()",

oh , can't return value because function nested hierarchy complex. :(

can me this;

    public class tryactivity extends activity     {         double bat;\\ global value      public void oncreate(bundle savedinstancestate)             {               disp(); // calling function disp set value bat                         string to_string=double.tostring(bat);                 system.out.println("current battery level  ==="+to_string); \\ prints 0.0 wrong value         super.oncreate(savedinstancestate);             setcontentview(r.layout.main);             }        public void disp(){                     this.registerreceiver(this.batteryinforeceiver, new intentfilter(intent.action_battery_changed));                        }            private broadcastreceiver batteryinforeceiver = new broadcastreceiver(){                         public void onreceive(context context, intent intent){                           double  level= intent.getintextra(batterymanager.extra_level,0);         bat=level;             textview1 = (edittext) findviewbyid(r.id.textview1);             textview1.settext(double.tostring(bat));      // sets correct value             system.out.println("bbbattererrerey 1 "+double.tostring(bat));   //prints correct value         }             }; } 

simply initialize variable public static gobally in class. able access anywhere.