[react-native]could not connect to development server on android

gistfile1.txt

Starting with Android 9.0 (API level 28), cleartext support is disabled by default. we can use android:usesCleartextTraffic="true" this will work but this is not recommended solution. For Permanent and recommended Solution is

Step 1 : create a file in android folder app/src/debug/res/xml/network_security_config.xml

Step 2 : add this <?xml version="1.0" encoding="utf-8"?>

<network-security-config>
  <!-- deny cleartext traffic for React Native packager ips in release -->
  <domain-config cleartextTrafficPermitted="true">
    <domain includeSubdomains="true">localhost</domain>
    <domain includeSubdomains="true">10.0.2.2</domain>
    <domain includeSubdomains="true">10.0.3.2</domain>
  </domain-config>
</network-security-config>

Step 3 : Apply the config to your AndroidManifest.xml 

 <application  
      android:networkSecurityConfig="@xml/network_security_config">
 </application>