Android example to list NetworkInterface

MainActivity.java

package com.blogspot.android_er.androidscannetworkinterface;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;

public class MainActivity extends AppCompatActivity {

 private Button btnScan;
 private ListView listViewNI;

 ArrayList<String> niList;
 ArrayAdapter<String> adapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 btnScan = (Button)findViewById(R.id.scan);
 listViewNI = (ListView)findViewById(R.id.listviewni);


 niList = new ArrayList();
 adapter = new ArrayAdapter<String>(this,
 android.R.layout.simple_list_item_1, android.R.id.text1, niList);
 listViewNI.setAdapter(adapter);

 btnScan.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 new ScanNITask().execute();
 }
 });
 }


 private class ScanNITask extends AsyncTask<Void, String, Void> {

 @Override
 protected void onPreExecute() {
 niList.clear();
 adapter.notifyDataSetInvalidated();
 }

 @Override
 protected Void doInBackground(Void... params) {

 try {
 Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
 while (networkInterfaces.hasMoreElements()) {

 NetworkInterface thisInterface = networkInterfaces.nextElement();
 Enumeration<InetAddress> inetAddresses = thisInterface.getInetAddresses();
 if (inetAddresses.hasMoreElements()) {
 String niInfo = thisInterface.getDisplayName() + " ";

 while (inetAddresses.hasMoreElements()) {
 InetAddress thisAddress = inetAddresses.nextElement();
 niInfo += "--- ";
 niInfo += "Address: " + thisAddress.getAddress() + " ";
 niInfo += "CanonicalHostName: " + thisAddress.getCanonicalHostName() + " ";
 niInfo += "HostAddress: " + thisAddress.getHostAddress() + " ";
 niInfo += "HostName: " + thisAddress.getHostName() + " ";
 }

 publishProgress(niInfo);
 }


 }
 } catch (SocketException e) {
 e.printStackTrace();
 }

 return null;
 }

 @Override
 protected void onProgressUpdate(String... values) {
 niList.add(values[0]);
 adapter.notifyDataSetInvalidated();

 }

 @Override
 protected void onPostExecute(Void aVoid) {
 Toast.makeText(MainActivity.this, "Done", Toast.LENGTH_LONG).show();
 }
 }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 
 
 android_layout_width="match_parent"
 android_layout_height="match_parent"
 android_padding="16dp"
 android_orientation="vertical"
 tools_context=".MainActivity">

 <TextView
 android_layout_width="wrap_content"
 android_layout_height="wrap_content"
 android_layout_gravity="center_horizontal"
 android_autoLink="web"
 android_text="http://android-er.blogspot.com/"
 android_textStyle="bold" />

 <Button
 android_id="@+id/scan"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_text="Scan"/>
 <ListView
 android_id="@+id/listviewni"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"/>
</LinearLayout>

Permission of "android.permission.INTERNET" is needed in AndroidManifest.xml

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