Fixed issue with Android 9 and CLEARTEXT communication issue.

app/src/main/AndroidManifest.xml

@@ -12,6 +12,7 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
+        android:networkSecurityConfig="@xml/network_security_config"
         android:theme="@style/NoBar">
         <activity
             android:name=".MainActivity"

app/src/main/res/xml/network_security_config.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<network-security-config>
+    <base-config cleartextTrafficPermitted="true" >
+    </base-config>
+</network-security-config>