android - How to refresh the ListView in Drag-Sort ListView? -

i have implement drag-sort listview(dslv) , lazylist in project, download demo lazylist , drag-sort listview github integrate , modify per requirement ,

i use dslv drag , sort items of listview , lazylist displaying image url, implement "basic usage playground" dslv drag , sort,

i have implement search in testbeddslv.java, problem when search content list, can't update list, have tried notifydatasetchanged method not works, create new adapter , pass listview lv.setadapter(adapter) , here set listadapter, cant lv.setadapter(adapter)

testbeddslv.java

package com.mobeta.android.demodslv;  import android.os.bundle; import android.support.v4.app.fragment; import android.support.v4.app.fragmentactivity; import android.text.editable; import android.text.textwatcher; import android.view.menu; import android.view.menuinflater; import android.widget.button; import android.widget.edittext;  import com.mobeta.android.dslv.dragsortcontroller; import com.mobeta.android.dslv.dragsortlistview;  public class testbeddslv extends fragmentactivity {   private int mnumheaders = 0; private int mnumfooters = 0;  private int mdragstartmode = dragsortcontroller.on_down; private boolean mremoveenabled = false; private int mremovemode = dragsortcontroller.fling_right_remove; private boolean msortenabled = true; private boolean mdragenabled = true;  private string mtag = "dslvtag"; button search; edittext search_customer;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.test_bed_main);      search = (button) findviewbyid(r.id.btn_search);     search_customer = (edittext) findviewbyid(r.id.search_product);      search_customer.addtextchangedlistener(new textwatcher() {          @override         public void ontextchanged(charsequence s, int start, int before,                 int count) {              // here logic refresh list view         }          @override         public void beforetextchanged(charsequence s, int start, int count,                 int after) {          }          @override         public void aftertextchanged(editable s) {          }     });      if (savedinstancestate == null) {         getsupportfragmentmanager().begintransaction()                 .add(r.id.test_bed, getnewdslvfragment(), mtag).commit();     } }  @override public boolean oncreateoptionsmenu(menu menu) {     menuinflater inflater = getmenuinflater();     inflater.inflate(r.menu.mode_menu, menu);     return true; }   private fragment getnewdslvfragment() {     dslvfragmentclicks f = dslvfragmentclicks.newinstance(mnumheaders,             mnumfooters);     f.removemode = mremovemode;     f.removeenabled = mremoveenabled;     f.dragstartmode = mdragstartmode;     f.sortenabled = msortenabled;     f.dragenabled = mdragenabled;     return f; } } 

dslvfragmentclicks.java

package com.mobeta.android.demodslv;  import android.view.view; import android.widget.adapterview; import android.widget.listview; import android.os.bundle; import android.widget.toast;  public class dslvfragmentclicks extends dslvfragment {  public static dslvfragmentclicks newinstance(int headers, int footers) {     dslvfragmentclicks f = new dslvfragmentclicks();      bundle args = new bundle();     args.putint("headers", headers);     args.putint("footers", footers);     f.setarguments(args);      return f; }  adapterview.onitemlongclicklistener mlongclicklistener =          new adapterview.onitemlongclicklistener() {             @override             public boolean onitemlongclick(adapterview<?> arg0, view arg1, int arg2,                     long arg3) {                 string message = string.format("long-clicked item %d", arg2);                 toast.maketext(getactivity(), message, toast.length_short).show();                 return true;             }         };  @override public void onactivitycreated(bundle savedstate) {     super.onactivitycreated(savedstate);      listview lv = getlistview();     lv.setonitemclicklistener(new adapterview.onitemclicklistener() {         @override         public void onitemclick(adapterview<?> arg0, view arg1, int arg2,                 long arg3) {             string message = string.format("clicked item %d", arg2);             toast.maketext(getactivity(), message, toast.length_short).show();          }     });     lv.setonitemlongclicklistener(new adapterview.onitemlongclicklistener() {         @override         public boolean onitemlongclick(adapterview<?> arg0, view arg1, int arg2,                 long arg3) {             string message = string.format("long-clicked item %d", arg2);             toast.maketext(getactivity(), message, toast.length_short).show();             return true;         }     }); } } 

dslvfragment.java

package com.mobeta.android.demodslv;  import java.util.arraylist; import java.util.arrays;  import android.os.bundle; import android.support.v4.app.listfragment; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter;  import com.mobeta.android.dslv.dragsortcontroller; import com.mobeta.android.dslv.dragsortlistview;  public class dslvfragment extends listfragment {  arrayadapter<string> adapter;  private string[] array; public static arraylist<string> list;  private dragsortlistview.droplistener ondrop = new dragsortlistview.droplistener() {     @override     public void drop(int from, int to) {         if (from != to) {             string item = adapter.getitem(from);             adapter.remove(item);             adapter.insert(item, to);         }     } };  private dragsortlistview.removelistener onremove = new dragsortlistview.removelistener() {     @override     public void remove(int which) {         adapter.remove(adapter.getitem(which));     } };  protected int getlayout() {     return r.layout.dslv_fragment_main; }  /**  * return list item layout resource passed arrayadapter.  */ protected int getitemlayout() {     return r.layout.list_item_handle_right;  }  private dragsortlistview mdslv; private dragsortcontroller mcontroller;  public int dragstartmode = dragsortcontroller.on_down; public boolean removeenabled = false; public int removemode = dragsortcontroller.fling_right_remove; public boolean sortenabled = true; public boolean dragenabled = true;  public static dslvfragment newinstance(int headers, int footers) {     dslvfragment f = new dslvfragment();      bundle args = new bundle();     args.putint("headers", headers);     args.putint("footers", footers);     f.setarguments(args);      return f; }  public dragsortcontroller getcontroller() {     return mcontroller; }  /**  * called dslvfragment.onactivitycreated(). override set different  * adapter.  */ public void setlistadapter() {     array = getresources().getstringarray(r.array.jazz_artist_names);     list = new arraylist<string>(arrays.aslist(array));      adapter = new arrayadapter<string>(getactivity(), getitemlayout(),             r.id.text, list);     setlistadapter(adapter); }  /**  * called in oncreateview. override provide custom  * dragsortcontroller.  */ public dragsortcontroller buildcontroller(dragsortlistview dslv) {     dragsortcontroller controller = new dragsortcontroller(dslv);     controller.setdraghandleid(r.id.drag_handle);     controller.setclickremoveid(r.id.click_remove);     controller.setremoveenabled(removeenabled);     controller.setsortenabled(sortenabled);     controller.setdraginitmode(dragstartmode);     controller.setremovemode(removemode);     return controller; }  /** called when activity first created. */ @override public view oncreateview(layoutinflater inflater, viewgroup container,         bundle savedinstancestate) {     mdslv = (dragsortlistview) inflater.inflate(getlayout(), container,             false);      mcontroller = buildcontroller(mdslv);     mdslv.setfloatviewmanager(mcontroller);     mdslv.setontouchlistener(mcontroller);     mdslv.setdragenabled(dragenabled);      return mdslv; }  @override public void onactivitycreated(bundle savedinstancestate) {     super.onactivitycreated(savedinstancestate);      mdslv = (dragsortlistview) getlistview();      mdslv.setdroplistener(ondrop);     mdslv.setremovelistener(onremove);      bundle args = getarguments();     int headers = 0;     int footers = 0;     if (args != null) {         headers = args.getint("headers", 0);         footers = args.getint("footers", 0);     }     setlistadapter(); } } 

test_bed_main.xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" >  <linearlayout     android:id="@+id/search_lay"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:focusable="true"     android:focusableintouchmode="true"     android:orientation="horizontal" >      <edittext         android:id="@+id/search_product"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_marginbottom="2dp"         android:layout_marginleft="5dp"         android:layout_margintop="2dp"         android:layout_weight="1"         android:background="@drawable/search_back"         android:hint="enter firstname"         android:imeoptions="actionsearch"         android:inputtype="text"         android:paddingbottom="2dp"         android:paddingleft="5dp"         android:paddingtop="2dp"         android:visibility="visible" />      <button         android:id="@+id/btn_search"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_marginleft="5dp"         android:layout_marginright="5dp"         android:layout_weight="2.5"         android:text="cancel"         android:textcolor="#155280"         android:textsize="14sp"         android:textstyle="bold"         android:visibility="visible" /> </linearlayout>  <framelayout     android:id="@+id/test_bed"     android:layout_width="fill_parent"     android:layout_height="fill_parent" /> <!-- add dslvfragment inside framelayout in code -->  </linearlayout> 

and other require class can download github link given above.....

actually if see code closly there's method have mention

public void setlistadapter() {     array = getresources().getstringarray(r.array.jazz_artist_names);     list = new arraylist<string>(arrays.aslist(array));      adapter = new arrayadapter<string>(getactivity(), getitemlayout(),             r.id.text, list);     setlistadapter(adapter); } 

so said : "generally create new adapter , pass listview lv.setadapter(adapter) , here set listadapter, cant lv.setadapter(adapter)"

can't easily generating array based on search , set code ??

list = new arraylist<string>(arrays.aslist(array));          adapter = new arrayadapter<string>(getactivity(), getitemlayout(),                 r.id.text, list);         setlistadapter(adapter); 

edit: think asking wrong question. main concern should how communicate between activity , fragments...since search functionality in activity , list in fragment. need setup interface passes on search string fragment , there can make array , set same way doing right now.

read this question , answer. in answer you'll find 1 similar approach on passing data between activity , fragment.

edit 2: main concern communicate activity fragment this..declare interface in activity this:

    public interface fragmentcommunicator{        public void passdatatofragment(string somevalue);     }  call interface @ text change listener..for example      fragmentcommunicator mfragmentcommunicator;     //your oncreate function      {     //your textchangelistenr     {     ontextchanged call  if(mfragmentcommunicator != null)    mfragmentcommunicator.passdatatofragment(pass string here)     }  make fragement implement interface  public class somefragment extends fragment implements fragmentcommunicator { //this rest of fragment  @override public void passdatatofragment(string somevalue) { //this function fired each time text changed since in activity calling same function in textchange listener. string somevalue string passed activity   }  //rest of code . . . //don't forget initialize interface in fragment itself. in onattach @override  public void onattach(activity activity){   super.onattach(activity);   context = getactivity();    ((mainactivity)context).fragmentcommunicator = this; }  }  } 

you can refer this link further clarifications. check implementation of fragmentcommunicator