Immediately apply the dark mode setting once it's changed

app/src/main/java/me/impy/aegis/ui/PreferencesActivity.java

@@ -30,4 +30,21 @@ public class PreferencesActivity extends AegisActivity {
         // pass permission request results to the fragment
         _fragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
     }
+
+    @Override
+    protected final void onRestoreInstanceState(final Bundle inState) {
+        // pass the stored result intent back to the fragment
+        if (inState.containsKey("result")) {
+            _fragment.setResult(inState.getParcelable("result"));
+        }
+        super.onRestoreInstanceState(inState);
+    }
+
+    @Override
+    protected final void onSaveInstanceState(final Bundle outState) {
+        // save the result intent of the fragment
+        // this is done so we don't lose anything if the fragment calls recreate on this activity
+        outState.putParcelable("result", _fragment.getResult());
+        super.onSaveInstanceState(outState);
+    }
 }

app/src/main/java/me/impy/aegis/ui/PreferencesFragment.java

@@ -44,7 +44,7 @@ public class PreferencesFragment extends PreferenceFragment {
     private static final int CODE_PERM_IMPORT = 0;
     private static final int CODE_PERM_EXPORT = 1;
 
-    private Intent _result = new Intent();
+    private Intent _result;
     private DatabaseManager _db;
 
     // this is used to keep a reference to a database converter
@@ -60,14 +60,14 @@ public class PreferencesFragment extends PreferenceFragment {
         _db = app.getDatabaseManager();
 
         // set the result intent in advance
-        getActivity().setResult(Activity.RESULT_OK, _result);
+        setResult(new Intent());
 
         Preference darkModePreference = findPreference("pref_dark_mode");
         darkModePreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
             @Override
             public boolean onPreferenceChange(Preference preference, Object newValue) {
                 _result.putExtra("needsRecreate", true);
-                Toast.makeText(getActivity(), "Dark mode setting will be applied after closing this screen", Toast.LENGTH_SHORT).show();
+                getActivity().recreate();
                 return true;
             }
         });
@@ -175,6 +175,15 @@ public class PreferencesFragment extends PreferenceFragment {
         }
     }
 
+    public Intent getResult() {
+        return _result;
+    }
+
+    public void setResult(Intent result) {
+        _result = result;
+        getActivity().setResult(Activity.RESULT_OK, _result);
+    }
+
     private void onImport() {
         if (PermissionHelper.request(getActivity(), CODE_PERM_IMPORT, Manifest.permission.READ_EXTERNAL_STORAGE)) {
             Intent intent = new Intent(Intent.ACTION_GET_CONTENT);