How to pass checkboxes in different activities to one single activity in android? -

i making android app in there different cities in different activities. example, there 1 activity dalhousie , activity shimla. , in each activity there 1 heart shaped checkbox, in instagram. if check check boxes, city appear in activity profileactivity.java has list of favorite cities have checked. don't know how intent different activities 1 single activity.

here code dalhousieactivity.java

package com.example.srushtee.dummy;  import android.app.activity; import android.content.intent; import android.content.sharedpreferences; import android.support.v4.view.viewpager; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.text.method.scrollingmovementmethod; import android.util.log; import android.view.view; import android.widget.button; import android.widget.checkbox; import android.widget.compoundbutton; import android.widget.textview;  import me.relex.circleindicator.circleindicator;  public class dalhousieactivity extends appcompatactivity {  private viewpager viewpager; private customswipeadapter adapter; private static int currentpage = 0; private int[] img; private checkbox favouritebtn; private textview textview; boolean flag=false; private button continuebooking;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_dalhousie);     boolean ischecked = getbooleanfrompreferences("ischecked");     img = new int[]{r.drawable.dalhousie, r.drawable.dalhousie3, r.drawable.dalhousie2, r.drawable.dalhousie1};     viewpager = (viewpager) findviewbyid(r.id.view_pager);     adapter = new customswipeadapter(dalhousieactivity.this, img);     viewpager.setadapter(adapter);     circleindicator indicator = (circleindicator) findviewbyid(r.id.indicator);     indicator.setviewpager(viewpager);      viewpager.setonpagechangelistener(new viewpager.onpagechangelistener() {         @override         public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {          }          @override         public void onpageselected(int position) {             currentpage = 1;          }          @override         public void onpagescrollstatechanged(int i) {             if (i == viewpager.scroll_state_idle) {                 int pagecount = img.length;                 if (currentpage == 0) {                     viewpager.setcurrentitem(pagecount - 1, false);                 } else if (currentpage == pagecount - 1) {                     viewpager.setcurrentitem(0, false);                 }              }          }     });      favouritebtn = (checkbox) findviewbyid(r.id.buttonfav);     log.i("start", "" + ischecked);     favouritebtn.setchecked(ischecked);     favouritebtn.setoncheckedchangelistener(new compoundbutton.oncheckedchangelistener() {         @override         public void oncheckedchanged(compoundbutton view, boolean ischecked) {             log.i("boolean", "" + ischecked);             dalhousieactivity.this.putbooleaninpreferences(ischecked, "ischecked");             flag=true;             intent i=new intent(getapplicationcontext(),profileactivity.class);             i.putextra("dalhousie",flag);           }     });    continuebooking=(button) findviewbyid(r.id.continue_booking);     continuebooking.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {                 intent i=new intent(dalhousieactivity.this,confirmationactivity.class);                 startactivity(i);         }     });   }      public void putbooleaninpreferences(boolean ischecked,string key){     sharedpreferences sharedpreferences = this.getpreferences(activity.mode_private);     sharedpreferences.editor editor = sharedpreferences.edit();     editor.putboolean(key, ischecked);     editor.commit(); } public boolean getbooleanfrompreferences(string key){     sharedpreferences sharedpreferences = this.getpreferences(activity.mode_private);     boolean ischecked = sharedpreferences.getboolean(key, false);     return ischecked; } } 

and here code profileactivity.class

package com.example.srushtee.dummy;  import android.content.intent; import android.os.handler; import android.os.process; import android.provider.contactscontract; import android.support.annotation.nonnull; import android.support.design.widget.navigationview; import android.support.v4.view.gravitycompat; import android.support.v4.widget.drawerlayout; import android.support.v7.app.actionbardrawertoggle; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.support.v7.widget.linearlayoutmanager; import android.support.v7.widget.recyclerview; import android.support.v7.widget.toolbar; import android.view.menuitem; import android.view.view; import android.widget.arrayadapter; import android.widget.button; import android.widget.listview; import android.widget.textview; import android.widget.toast;  import com.google.firebase.auth.firebaseauth; import com.google.firebase.auth.firebaseuser;  import java.util.arraylist; import java.util.list;  public class profileactivity extends appcompatactivity { private drawerlayout mdrawerlayout; private actionbardrawertoggle mtoggle;  private boolean backpressedtoexitonce; private boolean doublebacktoexitpressedonce;  private navigationview navigationview; private firebaseauth firebaseauth; private button upload_btn; boolean flag=false; listview listview; string favname;    @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      setcontentview(r.layout.activity_profile);     firebaseauth=firebaseauth.getinstance();     if(firebaseauth==null)     {         finish();         startactivity(new intent(this,mainactivity.class));     }     firebaseuser user=firebaseauth.getcurrentuser();       getsupportactionbar().setdisplayhomeasupenabled(true);       navigationview=(navigationview) findviewbyid(r.id.navigation_view);     navigationview.setnavigationitemselectedlistener(new    navigationview.onnavigationitemselectedlistener() {          @override         public boolean onnavigationitemselected(@nonnull menuitem item) {             if(item.ischecked()) item.setchecked(false);             else item.setchecked(true);             mdrawerlayout.closedrawers();             switch(item.getitemid())             {                 case r.id.nav_account:                     toast.maketext(profileactivity.this,"called account",toast.length_short).show();                     //startactivity(new intent(profileactivity.this,account.class));                     return true;                 case r.id.nav_logout:                     signout();                     return true;                 case r.id.nav_cities:                     startactivity(new intent(profileactivity.this,citiesactivity.class));                     return true;                   default:                     toast.maketext(profileactivity.this,"default",toast.length_short).show();                     return true;             }         }     });      actionbardrawertoggle actionbardrawertoggle = new actionbardrawertoggle(this,mdrawerlayout,r.string.open, r.string.close){          @override         public void ondrawerclosed(view drawerview) {             // code here triggered once drawer closes dont want happen leave blank             super.ondrawerclosed(drawerview);         }          @override         public void ondraweropened(view drawerview) {             // code here triggered once drawer open dont want happen leave blank              super.ondraweropened(drawerview);         }     };     mdrawerlayout = (drawerlayout) findviewbyid(r.id.drawerlayout);     mtoggle=new actionbardrawertoggle(this,mdrawerlayout,r.string.open,r.string.close);     mdrawerlayout.adddrawerlistener(mtoggle);     mtoggle.syncstate();     mtoggle.settoolbarnavigationclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             mdrawerlayout.opendrawer(gravitycompat.start);         }     });        //list<list_item> data = new arraylist<>();    /* (int j = 0; j < 6; j++) {         list_item item = new list_item();         item.setimageresid(place_image[j]);         item.settitle(place_name[j]);         item.setid(place_name[j]);         item.setstatus(place_desc[j]);         data.add(item);     }      list_data = (arraylist) data;      //data stored , retrieved until      rec_view = (recyclerview) findviewbyid(r.id.places_recyler_view);     rec_view.setlayoutmanager(new linearlayoutmanager(this));      adapter = new derp_adapter(data, this);     rec_view.setadapter(adapter);      adapter.setitemclickcallback(this);*/      upload_btn=(button) findviewbyid(r.id.upload_photo_btn);     upload_btn.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             startactivity(new intent(profileactivity.this,uploadphotoactivity.class));         }     });         }  private void signout() {     if(firebaseauth!=null)     {         firebaseauth.signout();     }     finish();     startactivity(new intent(this,mainactivity.class));  }  @override public boolean onoptionsitemselected(menuitem item) {     if(mtoggle.onoptionsitemselected(item))     {         return true;     }     return super.onoptionsitemselected(item); } public void onbackpressed() {     if (doublebacktoexitpressedonce) {         movetasktoback(true);         process.killprocess(process.mypid());         system.exit(1);      }     this.doublebacktoexitpressedonce = true;     toast.maketext(this, "press again exit", toast.length_short).show();     new handler().postdelayed(new runnable() {         @override         public void run() {             doublebacktoexitpressedonce = false;         }     }, 1000);  } }