Refactoring

app/src/main/java/eu/faircode/email/ActivityBase.java

@@ -70,17 +70,18 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
 
         if (!this.getClass().equals(ActivityMain.class)) {
-            String theme = prefs.getString("theme", null);
-            if ("system".equals(theme)) {
+            String theme = prefs.getString("theme", "light");
+
+            if ("dark".equals(theme))
+                setTheme(R.style.AppThemeDark);
+            else if ("black".equals(theme))
+                setTheme(R.style.AppThemeBlack);
+            else if ("system".equals(theme)) {
                 int uiMode = getResources().getConfiguration().uiMode;
                 Log.i("UI mode=" + uiMode);
                 if ((uiMode & Configuration.UI_MODE_NIGHT_YES) != 0)
                     setTheme(R.style.AppThemeBlack);
             }
-            if ("dark".equals(theme))
-                setTheme(R.style.AppThemeDark);
-            else if ("black".equals(theme))
-                setTheme(R.style.AppThemeBlack);
         }
 
         prefs.registerOnSharedPreferenceChangeListener(this);