android - Clear listview content? -

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i have little problem listview. how clear listview content, knowing has custom adapter?

edit : custom adapter class extends baseadapter, looks :

import android.app.activity; import android.content.context; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.baseadapter; import android.widget.textview; public class myadapter extends baseadapter {      private activity activity;     private string[] data;     private static layoutinflater inflater=null;      public myadapter(activity _a, string[] _str)     {         activity = _a;         data = _str;         inflater = (layoutinflater)activity.getsystemservice(context.layout_inflater_service);     }      public static class viewholder{         public textview text;     }      @override     public int getcount() {         return data.length;     }      @override     public object getitem(int position) {         return position;     }      @override     public long getitemid(int position) {         return position;     }      @override     public view getview(int position, view view, viewgroup parent) {         view v = view;         viewholder holder;         if(v == null)         {             v = inflater.inflate(r.layout.rowa, null);             holder=new viewholder();             holder.text=(textview)v.findviewbyid(r.id.dexter);             v.settag(holder);         }else{             holder=(viewholder)v.gettag();         }          holder.text.settext(data[position]);           return v;     }  }

simply write

listview.setadapter(null);

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