It’s very easy you can fix it by editing your AndroidManifest.xml and set the Clear text Traffic to true ( change the False to true )
Like the example
I had the same problem, but keep in mind this is temporarily fix
Example
android:usesCleartextTraffic=”true”
<application
android:name=”io.flutter.app.Test”
android:label=”bell_ui”
android:icon=”@mapmap/ic_launcher”
android:usesCleartextTraffic=”true”>