Fix NPE in constructor

Move getActivity() call and fetching of metrics feature provider into
onCreateView rathre than the Constructor of the fragment (where Activity
is not yet created).

Test: manual
Test: existing robotests
Fixes: 128808444
Change-Id: I88586b0ca3ebda60f8933041322541cc5911de68

src/com/android/settings/panel/PanelFragment.java

@@ -48,16 +48,11 @@ public class PanelFragment extends Fragment {
     private RecyclerView mPanelSlices;
 
     private PanelContent mPanel;
-    private final MetricsFeatureProvider mMetricsProvider;
+    private MetricsFeatureProvider mMetricsProvider;
 
     @VisibleForTesting
     PanelSlicesAdapter mAdapter;
 
-    public PanelFragment() {
-        final Context context = getActivity();
-        mMetricsProvider = FeatureFactory.getFactory(context).getMetricsFeatureProvider();
-    }
-
     @Nullable
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@@ -83,6 +78,7 @@ public class PanelFragment extends Fragment {
                 .getPanelFeatureProvider()
                 .getPanel(activity, panelType, mediaPackageName);
 
+        mMetricsProvider = FeatureFactory.getFactory(activity).getMetricsFeatureProvider();
         // Log panel opened.
         mMetricsProvider.action(
                 0 /* attribution */,