Applying a background image to listview with textview

I'm trying to create a listview wi开发者_运维技巧th a static background image (i.e. not contained within the individual list cells, but fills the display and does not move when list is scrolled). I've found a couple references here and am trying to implement, but no joy. The first is;

Set a background for a listview

In particular, I'm trying this;

    //set background to Drawable
listView.setBackgroundDrawable(myDrawable);

To create the "myDrawable" variable, I'm using a suggestion from;

How can I access an android drawable by a variable

Again, the particular code I'm trying is;

String icon="logo" + cnt;
 int resID = getResources().getIdentifier(icon, "drawable",  getPackageName()); 
 logo.setImageResource(resID);

Here is the code I created;

ListView lv = getListView();
  lv.setTextFilterEnabled(true);

  String bg="football_turf_subtle";
  int resID = getResources().getIdentifier(bg, "drawable", getPackageName());
  myDrawable.setImageResource(resID);

  lv.setBackgroundDrawable(myDrawable);

The problem I'm running into in my code is "myDrawable cannot be resolved"? If it's not obvious, I'm new to Android/Java.

Thanks in advance for any help!

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Just do lv.setBackgroundResource(R.drawable.football_turf_subtle).