Android : PowerMock not stubbing static method properly?

I'm trying to write a VERY simple test, using powermock and Robolectric. Here's my code:

import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.robolectric.RobolectricTestRunner;

import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(RobolectricTestRunner.class)
@PowerMockIgnore({ "org.mockito.*", "org.robolectric.*", "android.*" })
@PrepareForTest(BadStaticClass.class)
public class SomeActivityTest {

    @Test
    public void testSomething() {
        PowerMockito.mockStatic(BadStaticClass.class);
        Mockito.when(BadStaticClass.dontWantThisMethod()).thenReturn(false);
        new SomeActivity().usesStatic();
    }
}

Basically, i have a class, "SomeActivity", and it has a method that makes a call to BadStaticClass.dontWantThisMethod(). i want that static method to be stubbed out.

why is my code not working?

i kept getting errors like: you are trying to stub a final method, you naughty developer!

which, i thought the whole point of PowerMock was to not see that.