layout - Android ExpandableListView not showing -

so have expandablelistview in layout, reason showing part of when run app. yes, it's "some" part - enture first groupview.

if set fixed height list @ android:layout_height="some dp", instead of android:layout_height="match_parent" can see whole list. but, if have many group view's , child view's, again, can see part of (as height fixed).

i've tried put expandable list inside linearlayout, have tried set android:layout_height="wrap_content", , on, without success.

how can solve this?

thank you,

<?xml version="1.0" encoding="utf-8"?>  <!-- that's main layout.--> <scrollview xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/scroll_view_m" android:layout_width="match_parent" android:layout_height="match_parent">  <!-- linearlayout here because scrollview can have 1 child view.--> <linearlayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">      <!-- that's second scrollview. 1 horizontal.-->     <horizontalscrollview         android:id="@+id/map_layout"         android:layout_width="match_parent"         android:layout_height="400dp">          <!-- linearlayout here because scrollview can have 1 child view.-->         <linearlayout             android:layout_width="match_parent"             android:layout_height="match_parent"             android:orientation="horizontal">              <!-- view's here -->          </linearlayout>      </horizontalscrollview>      <textview         android:id="@+id/scroll_down"         android:text="scroll down see marker info!"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:textcolor="@android:color/holo_green_light"         android:background="@android:color/black"/>      <expandablelistview         android:id="@+id/m_expandable_list_view"         android:layout_width="match_parent"         android:layout_height="match_parent">     </expandablelistview>  </linearlayout>  </scrollview>