How to determine if network type (2G, 3G or 4G) in Android Kotlin?

This example demonstrates how to determine if network type (2G, 3G or 4G) in Android Kotlin.
Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
   android:id="@+id/relativeLayout"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:padding="4dp"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/textViewTitle"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="50dp"
      android:padding="8dp"
      android:text="Tutorials Point"
      android:textColor="@color/colorPrimaryDark"
      android:textSize="48sp"
      android:textStyle="bold" />
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:text="Detecting the network type 2G/3G/4G"
      android:textAlignment="center"
      android:textColor="@android:color/background_dark"
      android:textSize="24sp"
      android:textStyle="bold" />
</RelativeLayout>
Step 4 − Add the following code to src/MainActivity.kt
import android.content.Context
import android.os.Bundle
import android.telephony.TelephonyManager
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import java.util.*
class MainActivity : AppCompatActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      getNetworkClass(applicationContext)
   }
   private fun getNetworkClass(context: Context) {
      val mTelephonyManager = context.getSystemService(Context.TELEPHONY_SERVICE) as
      TelephonyManager
      when (Objects.requireNonNull(mTelephonyManager).networkType) {
         TelephonyManager.NETWORK_TYPE_GPRS,
         TelephonyManager.NETWORK_TYPE_EDGE, TelephonyManager.NETWORK_TYPE_CDMA,
         TelephonyManager.NETWORK_TYPE_1xRTT, TelephonyManager.NETWORK_TYPE_IDEN -> {
            run { Toast.makeText(applicationContext, "Connection Available is 2G",
            Toast.LENGTH_SHORT).show() }
            run {
               Toast.makeText(applicationContext, "Connection Available is 3G",
               Toast.LENGTH_SHORT).show()
            }
            run {
               Toast.makeText(applicationContext, "Connection Available is 4G",
               Toast.LENGTH_SHORT).show()
            }
            return
         }
         TelephonyManager.NETWORK_TYPE_UMTS,
         TelephonyManager.NETWORK_TYPE_EVDO_0, TelephonyManager.NETWORK_TYPE_EVDO_A,
         TelephonyManager.NETWORK_TYPE_HSDPA, TelephonyManager.NETWORK_TYPE_HSUPA,
         TelephonyManager.NETWORK_TYPE_HSPA, TelephonyManager.NETWORK_TYPE_EVDO_B,
         TelephonyManager.NETWORK_TYPE_EHRPD, TelephonyManager.NETWORK_TYPE_HSPAP ->{
            run {
               Toast.makeText(applicationContext, "Connection Available is 3G",
               Toast.LENGTH_SHORT).show()
            }
            run {
               Toast.makeText(applicationContext, "Connection Available is 4G",
               Toast.LENGTH_SHORT).show()
            }
            return
         }
         TelephonyManager.NETWORK_TYPE_LTE -> {
            run {
               Toast.makeText(applicationContext, "Connection Available is 4G",
               Toast.LENGTH_SHORT).show()
            }
            return
         }
         else -> {
         }
      }
   }
}
Step 5 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.kotlipapp">
   <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">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen