listview into scrollview

[Costas]

-Fix listview item height with General.setListViewHeightBasedOnChildren</b>
-Scrollview can grow with fillViewport</b>
-Scroll to Top

WARNING the listview_item.xml (filled on adapter) MUST contains LinearLayouts non Relatives. On old devices users got

java.lang.NullPointerException at android.widget.RelativeLayout.onMeasure(RelativeLayout.java)

//source - http://stackoverflow.com/a/8406253/1320686
<ScrollView
        android:id="@+id/product_detail_scrollView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/product_details" 
        android:fillViewport="true" >

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >
.
.
		<ListView
			android:id="@+id/product_detail_lstv"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:focusable="false"
			android:layout_below="@+id/x"
			android:layout_marginBottom="2dip"
			android:divider="#c4cacb"
			android:dividerHeight="2dp" />
	</RelativeLayout>
</ScrollView>

 
 

...fill listview
.
..
} finally {
	lstv_adapter.notifyDataSetChanged();

	//scroll to top
	((ScrollView) findViewById(R.id.product_detail_scrollView)).smoothScrollTo(0,0);

	//fix listview height
	General.setListViewHeightBasedOnChildren(lstv);
}

public final class General {

    public static void setListViewHeightBasedOnChildren(ListView listView) {
        ListAdapter listAdapter = listView.getAdapter(); 
        if (listAdapter == null) {
            // pre-condition
            return;
        }

        int totalHeight = 0;
        for (int i = 0; i < listAdapter.getCount(); i++) {
            View listItem = listAdapter.getView(i, null, listView);
            listItem.measure(0, 0);
            totalHeight += listItem.getMeasuredHeight();
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        listView.setLayoutParams(params);
        listView.requestLayout();
    }     
}