how to save static fields in android junit tests?

if you have "extends ActivityInstrumentationTestCase2" android junit tests then their static fields will be cleared out after each method run (if you call super.tearDown()), the problem is with android.test.ActivityTestCase#scrubClass()

protected void scrubClass(final Class<?> testCaseClass)
    throws IllegalAccessException {
        final Field[] fields = getClass().getDeclaredFields();
        for (Field field : fields) {
            final Class fieldClass = field.getDeclaringClass();
            if (testCaseClass.isAssignableFrom(fieldClass) && !field.getType().isPrimitive()) {
                try {
                    field.setAccessible(true);
                    field.set(this, null);
                } catch (Exception e) {
                    android.util.Log.d("TestCase", "Error: Could not nullify field!");
                }

                if (field.get(this) != null) {
                    android.util.Log.d("TestCase", "Error: Could not nullify field!");
                }
            }
        }
    }

-which is called from android.test.ActivityInstrumentationTestCase2#tearDown(). Just override it with empty method:

    @Override
    protected void scrubClass(Class testCaseClass) {
        // ignore
    }

-and you'll save your static variables!

Non static fields will be cleared by default JUnit implemention, so you should not get any regression issues here ))
p.s. +SO question

faced gotcha: puzzle with google account in android emulator

When creating your device in AVD - if you select configuration by android version like android 2.2 - you 'll fail to add google account on it ))

Only if you select device configuration by Google API Version (like API Level 8) - you'll get an ability to have google/gmail sign-on on you emulator. Quite a funny.

- related SO question.