[android] - remove timer from compassView, make fading when facing north optional. (#6786)

save state for recreating map view

fix review comments

unit test covering default value for fading and setting a new value

fixup setter, fix default value

platform/android/MapboxGLAndroidSDKTestApp/src/test/java/com/mapbox/mapboxsdk/maps/UiSettingsTest.java

@@ -7,6 +7,7 @@ import org.junit.Test;
 import org.mockito.InjectMocks;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.mock;
@@ -56,6 +57,13 @@ public class UiSettingsTest {
         assertTrue("Compass margin bottom should be same", uiSettings.getCompassMarginBottom() == 4);
     }
 
+    @Test
+    public void testCompassFadeWhenFacingNorth(){
+        assertTrue("Compass should fade when facing north by default.", uiSettings.isCompassFadeWhenFacingNorth());
+        uiSettings.setCompassFadeFacingNorth(false);
+        assertFalse("Compass fading should be disabled", uiSettings.isCompassFadeWhenFacingNorth());
+    }
+
     @Test
     public void testLogoEnabled() {
         uiSettings.setLogoEnabled(true);