Enter the IPAddress of your Computer in the place of JarsUbuntuComputer and also make sure Port number is same or not

also add this in Manifest in Application tag

android:usesCleartextTraffic="true"
android_allowClearUserData="true"

Full Code

<application
    android_allowBackup="true"
    android_icon="@mipmap/ic_launcher"
    android_label="@string/app_name"
    android_roundIcon="@mipmap/ic_launcher_round"
    android_supportsRtl="true"
    android_theme="@style/AppTheme"
    android_usesCleartextTraffic="true"
    android_allowClearUserData="true">
    <activity android_name=".MainActivity"></activity>

I’m trying to connect my mobile app with my desktop app, but it’s impossible for me.
Both devices are connected to the same wifi and i have the internet permisions on my manifest.

MANIFEST AFTER application tag

<uses-permission android_name="android.permission.INTERNET" />
<uses-permission android_name="android.permission.ACCESS_NETWORK_STATE" />

ERROR

I/System.out: Unable to resolve host "JarsUbuntuComputer": No address associated with hostname