net::ERR_CLEARTEXT_NOT_PERMITTED
// Agrega esta linea en el android/app/src/main/AndroidManifest.xml
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:usesCleartextTraffic="true" <------------- esta linea
android:theme="@style/AppTheme">