I have one question. I made quick search on the site, but don't found answer. We develop application that running android 2.2 and higher. For views customization we use many drawables, that used in such way: <LinearLayout ... android:background="@drawable/some_drawable"/> We use maps too and manipulate with many data in the memory, and our app got a heavy. On top devices, it work's great,but on other we got OutOfMemory exception after some minutes of using our application. It's look as we have memory leaks. I'm trying reduce the memory usage of our app. question, do we need manualy cleaning resources on destroing our activities: removes drawables for view, or system made it for us?