Fix ClearText Traffic Error in Android 9 Pie

In AndroidManifest.xml file add android:usesCleartextTraffic="true" this.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.mechat">
  <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
  <uses-permission android:name="android.permission.INTERNET" />
   <application android:label="Mechat.Android" android:usesCleartextTraffic="true">
    </application>
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
</manifest>