android - EXTRA_START_PLAYER cannot be resolved or is not a field -

package com.example.tictactoemain;  import com.example.tictactoelib.gameactivity; import com.example.tictactoelib.gameview.state;  import android.os.bundle; import android.app.activity; import android.view.menu;  import android.content.intent; import android.view.view; import android.view.view.onclicklistener;  import com.example.tictactoelib.gameactivity;  public class mainactivity extends activity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }      private void startgame(boolean startwithhuman) {         intent = new intent(this, gameactivity.class);         i.putextra(gameactivity.extra_start_player, startwithhuman ? state.player1.getvalue() : state.player2.getvalue());         startactivity(i);     }  } 

gameactivity :

package com.example.tictactoelib;  import android.os.bundle; import android.app.activity; import android.view.menu;  import com.example.tictactoelib.gameview.state;  public class gameactivity extends activity {      public static final string extra_start_player =              "com.example.android.tictactoelib.gameactivity.extra_start_player";       @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }  } 

inside of mainactivity getting error:

extra_start_player cannot resolved or not field. 

the main project references tictactoelib library green check box. tictactoelib created library project. although extra_start_player defined public static final string main project not seem see it. piecing tictactoe sdk android-17 project trying resolve error though not yet understand problem is.

i wondering exact meaning of: ="com.example.android.tictactoelib.gameactivity.extra_start_player";

thanks in advance...

use

private void startgame(boolean startwithhuman) {         intent = new intent(this, gameactivity.class);         i.putextra("com.example.android.tictactoelib.gameactivity.extra_start_player", startwithhuman ? state.player1.getvalue() : state.player2.getvalue());         startactivity(i);     } 

instead if using in 1 activity