android - seekbar not updating textview in Dialog custom layout -

i have layout seekbar , textview using inside dialog. when try update textview seekbar nothing happens.

i doing changes in onprogresschanged. here code milage_main.class:

public class milage_spinner extends activity {  @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate);  seekbar seekbar = (seekbar)findviewbyid(r.id.seekbar); seekbar.setprogress(10); seekbar.setmax(10);  final textview sbv = (textview) findviewbyid(r.id.drivetime); final edittext drive_time = (edittext)findviewbyid(r.id.runtime);  seekbar.setonseekbarchangelistener(new seekbar.onseekbarchangelistener(){ @override public void onprogresschanged(seekbar seekbar, int progress, boolean fromuser) { sbv.settext(string.valueof(progress)); drive_time.settext(progress); }  @override public void onstarttrackingtouch(seekbar seekbar) { }  @override public void onstoptrackingtouch(seekbar seekbar) { } }); } } 

and here dialog builder in mainactiviy.class getting layout milage_seekbar

private dialog createmilage(){ alertdialog.builder builder = new alertdialog.builder(this); layoutinflater inflater = this.getlayoutinflater(); linearlayout linearlayout = (linearlayout)inflater.inflate(r.layout.milage_spinner,null); builder.setview(linearlayout) .settitle("ktd") .setnegativebutton("ok", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int i) { dialog.dismiss(); } }) ; return builder.create(); } 

and xml in layout milage_seekbar looks this:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:weightsum="1">  <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:textappearance="?android:attr/textappearancelarge" android:text="large text" android:id="@+id/drivetime" android:layout_gravity="center_horizontal" /> <seekbar android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/seekbar" android:layout_gravity="center_horizontal" /> </linearlayout> 

is possible make onprogresschanged inside dialog in mainactivity?

milage_spinner xml code

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/layout"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:orientation="vertical"     android:padding="2dp"     android:layout_gravity="center" >      <textview         android:id="@+id/set_size_help_text"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="please select snowflake size"          android:textsize="25dp" />      <seekbar         xmlns:android="http://schemas.android.com/apk/res/android"         android:id="@+id/size_seekbar"         android:layout_width="250dp"         android:layout_height="wrap_content"         android:layout_margintop="10dp" />  </linearlayout> 

change dialog alertdialog in java code , call oncreate.

 private alertdialog createmilage() {         layoutinflater inflater = (layoutinflater) getsystemservice(context.layout_inflater_service);         view layout = inflater.inflate(r.layout.milage_spinner, (viewgroup) findviewbyid(r.id.layout));         alertdialog.builder builder = new alertdialog.builder(this)                 .setview(layout);         builder.setpositivebutton("ok", new dialoginterface.onclicklistener() {             @override             public void onclick(dialoginterface dialog, int which) {                 dialog.dismiss();             }         });         alertdialog alertdialog = builder.create();          alertdialog.show();         seekbar sb = (seekbar) layout.findviewbyid(r.id.size_seekbar);         final textview set_size_help_text = (textview) layout.findviewbyid(r.id.set_size_help_text);         sb.setonseekbarchangelistener(new seekbar.onseekbarchangelistener() {             @override             public void onprogresschanged(seekbar seekbar, int progress, boolean fromuser) {                 set_size_help_text.settext("" + progress);             }              @override             public void onstarttrackingtouch(seekbar seekbar) {              }              @override             public void onstoptrackingtouch(seekbar seekbar) {              }         });         return alertdialog;     }