undo some changes. no rotation possible anymore

NXTApp/app/src/main/java/com/example/paulforster/nxtapp/MainActivity.java

@@ -76,6 +76,15 @@ public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                     }
                 });
         getSupportFragmentManager().enableDebugLogging(true);
+        btDialog = new BluetoothDialogFragment();
+        MapFragment mapFragment = new MapFragment();
+        ParkFragment parkFragment = new ParkFragment();
+        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
+        ft.add(R.id.content, mapFragment, "MAPFRAGMENT");
+        ft.add(R.id.content, parkFragment, "PARKFRAGMENT");
+        ft.hide(parkFragment);
+        ft.commit();
+        /**
         if (savedInstanceState == null) {
             btDialog = new BluetoothDialogFragment();
             MapFragment mapFragment = new MapFragment();
@@ -90,6 +99,7 @@ public boolean onNavigationItemSelected(@NonNull MenuItem item) {
             MapFragment mapFragment = (MapFragment) getSupportFragmentManager().findFragmentByTag("MAPFRAGMENT");
             ParkFragment parkFragment = (ParkFragment) getSupportFragmentManager().findFragmentByTag("PARKFRAGMENT");
         }
+         */
 }
 
     @Override

NXTApp/app/src/main/java/com/example/paulforster/nxtapp/MapFragment.java

@@ -51,22 +51,24 @@ public class MapFragment extends Fragment {
     //Parkingslot-Kram
     private int noStoredSlots = 0;
     private int noSlots = 0;
-    ArrayList<IAndroidHmi.ParkingSlot> parkingslotArrayList;
-    ArrayList<ImageView> imageviewArrayList;
+    ArrayList<IAndroidHmi.ParkingSlot> parkingslotArrayList = new ArrayList<>();
+    ArrayList<ImageView> imageviewArrayList = new ArrayList<>();
 
     Handler mHandler = null;
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.map_fragment, container, false);
+        /**
         if (savedInstanceState != null) {
             // Restore last state
             parkingslotArrayList = savedInstanceState.getParcelableArrayList("parkingslotArrayList");
             //TODO die Dinger müssen nochmal gezeichnet werden
         } else {
             parkingslotArrayList = new ArrayList<>();
         }
+         */
         tileView = new TileView(this.getActivity());
         tileView.setSize(1024, 512);
         tileView.defineBounds(-30,90,210,-30);