refactor: improve React Native developer support setup and host resolution

Author: YogendraShelke

android/src/main/java/com/mendix/mendixnative/MendixInitializer.kt

@@ -33,12 +33,23 @@ class MendixInitializer(
     MxConfiguration.runtimeUrl = runtimeUrl
     MxConfiguration.warningsFilter = mendixApp.warningsFilter
 
+    // Must run before the first access to `reactHost` below (and before any reload).
+    // `PackagerConnectionSettings.debugServerHost` caches its value in memory for the
+    // lifetime of the process the first time it's read (e.g. by an eager dev-support
+    // settings reload triggered as soon as ReactHost/DevSupportManager is constructed).
+    // If that first read happens before we persist the real Metro host, RN falls back
+    // to its hardcoded emulator default (10.0.2.2:8081) and keeps using it for the rest
+    // of the process — even though the correct host is written to SharedPreferences —
+    // which is why a fresh app process (restart) "fixes" it but reload within the same
+    // process does not. Resolving/pushing the host here, before `reactHost` is touched,
+    // avoids that stale cache entirely.
+    if (hasRNDeveloperSupport) setupDeveloperApp(runtimeUrl, mendixApp)
+
     // Reload only if there's already a running instance.
     if (reactHost.currentReactContext != null) {
       reactHost.reload("Clean start for new Mendix app")
     }
     if (clearData) clearData(context.application)
-    if (hasRNDeveloperSupport) setupDeveloperApp(runtimeUrl, mendixApp)
   }
 
   fun onDestroy() {
@@ -64,6 +75,14 @@ class MendixInitializer(
     preferences.setDeltas(false)
     preferences.setDevMode((mendixApp.showExtendedDevMenu))
 
+    // Explicitly push the freshly resolved host into the live ReactHost's
+    // PackagerConnectionSettings. Writing to SharedPreferences alone (above) isn't
+    // enough if RN already cached a stale/default debug server host in memory for
+    // this process — this overwrite takes effect immediately, regardless of when
+    // that first (possibly premature) read happened.
+    reactHost.devSupportManager?.devSettings?.packagerConnectionSettings?.debugServerHost =
+      preferences.getMetroBundlerHost()
+
     clearCachedReactNativeDevBundle(context.application)
   }
 }