android - Programmatically change value of disabled radio button in each row of a ListView -

i have listview 3 textviews , radio button in each row. retrieve state firebase database , show in radio button. don't know how access radio button change state. know should use custom adapter don't how to. can ?

this code time being :

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_grille);     listview = (listview) findviewbyid(r.id._afficher);      bus = new bus(threadenforcer.main);      bus.register(this);      listview.addheaderview(getlayoutinflater().inflate(r.layout.header, null, false));      loaddata();  }  private void loaddata(){     databasereference mdb = firebasedatabase.getinstance().getreference("vfl");      mdb.addlistenerforsinglevalueevent(new valueeventlistener() {         @override         public void ondatachange(datasnapshot datasnapshot) {             matrixcursor matrixcursor= new matrixcursor(columns);             startmanagingcursor(matrixcursor);              (datasnapshot snapshot : datasnapshot.getchildren()) {                  (datasnapshot snapsht : snapshot.getchildren()){                      string s = snapsht.child("visiteur").getvalue().tostring();                     if(s.equals(visiteur) || s.equals(visiteur1)){                          matrixcursor.addrow(new object[] {count.incrementandget(), snapsht.child("date").getvalue().tostring(),                                 snapsht.child("zone").getvalue().tostring(),snapsht.child("visité").getvalue().tostring() });                      }                 }             }              bus.post(matrixcursor);          }         @override         public void oncancelled(databaseerror databaseerror) {          }     });   } @subscribe public void answeravailable( matrixcursor matrixcursor) {     // todo: react event somehow!      simplecursoradapter adapter = new simplecursoradapter(getapplicationcontext(), r.layout.ligne_afficher, matrixcursor, from, to, 0);      listview.setadapter(adapter); } 

see example using customadapter extending baseadapter class:

1. listview activity layout

<?xml version="1.0" encoding="utf-8"?> <listview xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="in.oxyzen.loc.youractivity" android:id="@+id/listview">  </listview> 

2. listview's single_item_layout.xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent">  <textview     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:text="tv1"     android:id="@+id/tv1"/> <textview     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:text="tv2"     android:id="@+id/tv2"/> <textview     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:text="tv3"     android:id="@+id/tv3"/> <radiobutton     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:text="button"     android:id="@+id/radiobutton"/>  </linearlayout> 

3. (listview's activity) youractivity.java

public class youractivity extends appcompatactivity implements childeventlistener {  listview listview; customadapter adapter; databasereference yourreference; progressdialog dialog;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      yourreference =firebasedatabase.getinstance().getreference().child("your_reference");     dialog = new progressdialog(this);     dialog.setmessage("loading...");     dialog.setcancelable(false);     setcontentview(r.layout.activity_your);     listview = (listview)findviewbyid(r.id.listview);     adapter = new customadapter();     listview.setadapter(adapter);     dialog.show();     yourreference.addchildeventlistener(this); }  @override public void onchildadded(datasnapshot datasnapshot, string s) {     dialog.dismiss();     adapter.additem(datasnapshot); }  @override public void onchildchanged(datasnapshot datasnapshot, string s) {  }  @override public void onchildremoved(datasnapshot datasnapshot) {  }  @override public void onchildmoved(datasnapshot datasnapshot, string s) {  }  @override public void oncancelled(databaseerror databaseerror) {  } } 

4. customadapter.java class listview

public class customadapter extends baseadapter {  arraylist<datasnapshot> values;  customadapter(){     values = new arraylist<>(); }  @override public int getcount() {     return values.size(); }  @override public object getitem(int position) {     return values.get(position);     //you can datasnapshot interacting listview items per position use in listview's activity.     //you can return null here. }  @override public long getitemid(int position) {     return 0; }  @override public view getview(int position, view convertview, viewgroup parent) {      datasnapshot snapshot = values.get(position);//use snapshot retrieve values textviews , radiobutton.     ourviewholder holder =new ourviewholder(parent.getcontext(),parent);     holder.tv1.settext(snapshot.getkey());     holder.tv2.settext("text textview 2");     holder.tv3.settext("text textview 3");     holder.button.setchecked(true);// manipulate radio button per wish here. checked example.     return holder.itemview; }  //custom method: notify , update adapter automatically if new child adds in firebase database. void additem(datasnapshot snapshot){     values.add(snapshot);     notifydatasetchanged(); }  //custom class: using ourviewholder pattern keeps alive java's oop concept i.e. 1 object per listview item. //inflate single item's layout in here , find components of item. private class ourviewholder {      view itemview;     textview tv1,tv2,tv3;     radiobutton button;      ourviewholder(context context, viewgroup parent){         itemview = layoutinflater.from(context).inflate(r.layout.single_item_layout,parent,false);         tv1=(textview)itemview.findviewbyid(r.id.tv1);         tv2=(textview)itemview.findviewbyid(r.id.tv2);         tv3=(textview)itemview.findviewbyid(r.id.tv3);         button=(radiobutton)itemview.findviewbyid(r.id.radiobutton);     } }  }