How to display image from URL on Android

I want to display image on screen. Image should come from URL, and not drawable.

Code is here:

<ImageView android:id="@+id/ImageView01" android:src = "http://l.yimg.com/a/i/us/we/52/21.gif"    android:layout_width="wrap_content" android:layout_height="wrap_content"></ImageView>

but it gives error at compile time.

How do I display image from URL in Android?