feat: 优化代码

app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt

@@ -18,6 +18,7 @@ import io.legado.app.lib.dialogs.yesButton
 import io.legado.app.lib.theme.ATH
 import io.legado.app.lib.theme.ColorUtils
 import io.legado.app.ui.widget.number.NumberPickerDialog
+import io.legado.app.ui.widget.prefs.IconListPreference
 import io.legado.app.utils.*
 
 
@@ -28,7 +29,9 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         addPreferencesFromResource(R.xml.pref_config_theme)
         if (Build.VERSION.SDK_INT < 26) {
-            preferenceScreen.removePreference(findPreference(PreferKey.launcherIcon))
+            findPreference<IconListPreference>(PreferKey.launcherIcon)?.let {
+                preferenceScreen.removePreference(it)
+            }
         }
         upPreferenceSummary("barElevation", AppConfig.elevation.toString())
     }