my problem is probably pretty simple. 
I have defined a LinearLayout in my layout.xml file and want to set the background drawable in code. 

layout.xml

```
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linlay"
android:orientation="vertical"
android:layout_width="fill_parent">
</LinearLayout>

```

.java

```
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    LinearLayout ln = (LinearLayout) this.findViewById(R.id.linlay);
    setContentView(ln);
    ln.setBackgroundDrawable(getResources().getDrawable(R.drawable.wallpaper));
}

```

If I run the app it says the application has stopped unexpectedly. 
any ideas?