java - ExpandableListView only showing one parent -

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among other views, trying programmatically add expandablelistview linearlayout. this, using simpleexpandablelistadapter. there supposed ten parent elements, each single child element. encased in onpostexecute of asynctask, if matters. here java:

arraylist<hashmap<string,string>> parentlist = new arraylist<>(); arraylist<arraylist<hashmap<string,string>>> childlist = new arraylist<>(); (int k = 0 ; k < 10 ; k++) {     hashmap<string,string> parentmap = new hashmap<>();     parentmap.put("item", + ":" + k + "source");     parentlist.add(parentmap);      arraylist<hashmap<string,string>> childitemlist = new arraylist<>();     hashmap<string,string> childmap = new hashmap<>();     childmap.put("item", + ":" + k + "data");     childitemlist.add(childmap);     childlist.add(childitemlist); }  /* build expandable list */ simpleexpandablelistadapter adapter = new simpleexpandablelistadapter(         details,          parentlist,         r.layout.expandable_parent,         new string[] {"item"},         new int[] {r.id.expandable_parent},          childlist,         r.layout.expandable_child,         new string[] {"item"},         new int[] {r.id.expandable_child} ); expandablelistview info = new expandablelistview(details); info.setadapter(adapter); layout.addview(info);

this expandable_parent.xml:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="horizontal"     android:layout_width="fill_parent"     android:layout_height="wrap_content">      <textview android:id="@+id/expandable_parent"         android:paddingleft="30dp"         android:paddingright="30dp"         android:layout_width="match_parent"         android:layout_height="wrap_content"/>  </linearlayout>

and expandable_child.xml:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="horizontal"     android:layout_width="fill_parent"     android:layout_height="wrap_content">      <textview android:id="@+id/expandable_child"         android:paddingleft="40dp"         android:paddingright="40dp"         android:layout_width="wrap_content"         android:layout_height="wrap_content"/>  </linearlayout>

there may few mistakes in there, took simplified version of java. problem when run, first parent element shows up. click on , image on left flips, indicating group opened, no child elements displayed. what's problem?


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