proper settings load and save

app/src/main/java/com/example/dcav2gui/MainActivity.java

@@ -85,6 +85,11 @@ public class MainActivity extends AppCompatActivity {
         return globalSettings;
     }
 
+    public void updateGlobalSettings() {
+        SettingsViewModel settingsViewModel = new ViewModelProvider(this).get(SettingsViewModel.class);
+        globalSettings = settingsViewModel.loadSettings(this);
+    }
+
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.

app/src/main/java/com/example/dcav2gui/ui/settings/SettingsFragment.java

@@ -127,6 +127,13 @@ public class SettingsFragment extends Fragment {
                         amountOfLogLines,
                         amountOfLastTrades);
                 Toast.makeText(getContext(), "Settings saved", Toast.LENGTH_SHORT).show();
+
+                // Update globalSettings
+                MainActivity mainActivity = (MainActivity) getActivity();
+                if (mainActivity!=null) {
+                    mainActivity.updateGlobalSettings();
+                }
+
             }
         });