android - Back button when using the same activity for different views -

i have listview populating data sqlite database , using same activity load different data in it, when row of listview clicked displays information in activity, question how handle button takes appropriate list.

1st button clicked :

intent i=new intent(hotel.class.this,activity_hotel);  i.putextra("btn",1);  startactivity(i);  

2nd button clicked :

intent i=new intent(hotel.class.this,activity_hotel.class); i.putextra("btn",2); startactivity(i); 

for button :

public boolean onkeydown(int keycode, keyevent event) {     if (keycode == keyevent.keycode_back) {         intent home_intent = new    intent(getapplicationcontext(),hotel.class).setflags(intent.flag_activity_clear_top);          startactivity(home_intent);         return true;     }      return super.onkeydown(keycode, event); } 

edited :

in mainactivity

      case 2:          intent intent3 = new intent(mainactivity.this,hotel.class);         string lien="hotel";         intent3.putextra("choix",lien);          startactivity(intent3);        break;         case 3:              intent intent4 = new intent(mainactivity.this,hotel.class);              lien="restaurant";             intent4.putextra("choix",lien);                startactivity(intent4);           break; 

hotel.class :

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_hotel);        mdbhelper = new databasehelper(this);      try {         mdbhelper.copydatabasefromasset();     } catch (ioexception e) {            // todo auto-generated catch block            e.printstacktrace();     }     mdbhelper.opendatabase();        intent = getintent();       string choix = i.getstringextra("choix");      c = mdbhelper.fetchallservices(choix); //récupération des données        startmanagingcursor(c);    string[] fromcolumns = {databasehelper.key_name};  //from   int[] toviews = {r.id.name}; //        // définition des éléments de la liste      dataadapter = new simplecursoradapter(this,r.layout.rows_services, c, fromcolumns, toviews, 0);          list = (listview) findviewbyid(r.id.list);     list.setadapter(dataadapter);  //afficher la liste     list.setonitemclicklistener(new onitemclicklistener() {            @override            public void onitemclick(adapterview<?> listview, view view,              int position, long id) {                  nom = (textview) view.findviewbyid(r.id.name); // nom c'est memid_tv                  string nom_val = nom.gettext().tostring();  // nom_val c'est memberid_val                  intent modify_intent = new intent(getapplicationcontext(),                     extendlist.class);  // extendlist c'est modify_member                 modify_intent.putextra("thename", nom_val); // thename c'est memberid             startactivity(modify_intent);          }           }); 

details activity (extendlist.class )

     protected void oncreate(bundle savedinstancestate) {      // todo auto-generated method stub      super.oncreate(savedinstancestate);      setcontentview(r.layout.activity_list_daughter);      dbhelper = new databasehelper(this);       try {             dbhelper.copydatabasefromasset();      } catch (ioexception e) {             // todo auto-generated catch block             e.printstacktrace();      }      dbhelper.opendatabase();        name = (textview) findviewbyid(r.id.name1);      adresse = (textview) findviewbyid(r.id.adresse);      numtel = (textview) findviewbyid(r.id.tel);      email = (textview) findviewbyid(r.id.email);      website = (textview) findviewbyid(r.id.website);      img = (imageview)findviewbyid(r.id.img1);        intent = getintent();       string thename = i.getstringextra("thename");  // thename c'est membername ( memberid )          services = new service();      services = dbhelper.get_servicesname(thename);       path = services.image;       resources res = getresources();      int resid = res.getidentifier(path, "drawable", "com.example.guide_oran");      img.setimageresource(resid);       name.settext( services.name);      adresse.settext(services.adresse);      numtel.settext(services.numtel);      email.settext(services.email);      website.settext(services.website);  }              public boolean onkeydown(int keycode, keyevent event) {     if (keycode == keyevent.keycode_back) {         intent home_intent = new intent(getapplicationcontext(),                 hotel.class).setflags(intent.flag_activity_clear_top);                       home_intent.putextra("choix",choix); // solution searching           startactivity(home_intent);         return true;     }      return super.onkeydown(keycode, event); } 

hope i've provided details. ( problem solved, i've added solution post )

your problem might following snippnet:

public boolean onkeydown(int keycode, keyevent event) {     if (keycode == keyevent.keycode_back) {         intent home_intent = new intent(getapplicationcontext(),             hotel.class).setflags(intent.flag_activity_clear_top);         startactivity(home_intent);         return true;     }     return super.onkeydown(keycode, event); }   

actually, (even edited solution) new intent causes problem return previous list. when return hotel.class, reinitialize activity. then, listview removed , reuploaded.

to avoid this, why don't can call finish() method destroy actual activity , return hotel activity? being said, you not recreate activity , use resources again repopulate list.

i think, should use method handle state follows:

// use method handle button pressed public void onbackpressed() {      super.onbackpressed();        // then, finish extendlist.class      this.finish(); }   

then extendlist activity destroyed whereas hotel activity, still behind, comes , displays previous list, without doing more.

let me know if helps.