Android global variable vs cannot resolve method getApplication() -

i'm trying create global variable shown in mutliple other stack answers, when follow instructions, "cannot resolve method getapplication()" when trying or set variable in other activity. doing wrong , how get/set variable? here's mainactivity code:

public class mainactivity extends appcompatactivity {     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);         setsupportactionbar(toolbar);     }      private int globalvariable_move;      public int getglobalvariable_move() {         return globalvariable_move;     }      public void setglobalvariable_move(int value) {         globalvariable_move = value;     } 

and here's activity code:

public class playactivity extends appcompatactivity {     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_play);          gameview.setontouchlistener(new view.ontouchlistener(){             public boolean ontouch(view v, motionevent event){                 int tempglobalvariablemove = ((mainactivity) this.getapplication()).getglobalvariable_move();                 return true;             }         });     } } 

you need implement in application custom class not in activity. this:

public class customapplication extends application {      private tracker mtracker;      public tracker getdefaulttracker() {         if (mtracker == null) {             mtracker = new tracker();         }         return mtracker;     } } 

and activity class like:

customapplication app = (customapplication) getapplication(); app.getdefaulttracker(); 

or better use singleton pattern store global state , variables.