优化

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

@@ -157,6 +157,11 @@ class OtherConfigFragment : BasePreferenceFragment(),
                 getString(R.string.pre_download_s, value)
             PreferKey.threadCount -> preference.summary = getString(R.string.threads_num, value)
             PreferKey.webPort -> preference.summary = getString(R.string.web_port_summary, value)
+            PreferKey.defaultCover -> preference.summary = if (value.isNullOrBlank()) {
+                getString(R.string.select_image)
+            } else {
+                value
+            }
             else -> if (preference is ListPreference) {
                 val index = preference.findIndexOfValue(value)
                 // Set the summary to reflect the new value.