How can I get @BeforeClass and @AfterClass equivalent in Junit3?

I want to back up my application's database before replacing it with the test fixture. I'm forced to use Junit3 because of Android limitations, and I want to implement the equivalent behavior of @BeforeClass an @AfterClass.

UPDATE: There is now a tool (Junit4Android) to get support for Junit4 on Android. It's a bit of a kludge but should work.

To achieve the @BeforeClass equivalent, I had been using a static variable and initializing it during the first run like this, but I need to be able to restore the database after running all the tests. I can't think of a way of detecting when the last test has run (since I believe there is no guarantee on the order of test execution.)

public class MyTest extends ActivityInstrumentationTestCase2<MainActivity> {
    private static boolean firstRun = true;

    @Override
    protected void setUp() {
        if(firstRun) {
            firstRun = false;
            setUpDatabaseFixture();
        }
    }
    ...
}