Get Devices Connected to Same Network Programmatically

Published December 08, 2020

In this post we will learn how to get list of devices connected to wifi network in Android.

For this example we are using the library Android NetworkTool

This library provides different features like

Port Scanning
Subnet Device Finder (discovers devices on local network)
Ping
Wake-On-Lan

Let's get started

Step 1: Create Android studio Project

Step 2: Add dependencies to your build.gradle files

Project Level Gradle file

 repositories {
        maven {
            url "https://jitpack.io"
        }
    }

App Level gradle file

 dependencies {
        compile 'com.github.stealthcopter:AndroidNetworkTools:0.4.5.3'
    }

When you add dependency please check for latest release here

Add permissions in Manifest file

<uses-permission android:name="android.permission.INTERNET" />

Step 3: Update main activity file

public class MainActivity extends AppCompatActivity {


    TextView tvWifiState;
    TextView tvScanning, tvResult;

    ArrayList<InetAddress> inetAddresses;

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

        tvWifiState = (TextView)findViewById(R.id.WifiState);
        tvScanning = (TextView)findViewById(R.id.Scanning);
        tvResult = (TextView)findViewById(R.id.Result);

        findSubnetDevices();
    }

    private void findSubnetDevices() {

        final long startTimeMillis = System.currentTimeMillis();
        tvScanning.setText("Scanning...");
        SubnetDevices subnetDevices = SubnetDevices.fromLocalAddress().findDevices(new SubnetDevices.OnSubnetDeviceFound() {

            @Override
            public void onDeviceFound(Device device) {

            }

            public void onFinished(ArrayList<Device> devicesFound) {
                float timeTaken =  (System.currentTimeMillis() - startTimeMillis)/1000.0f;

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        tvScanning.setText("Scan Finished");
                        for(Device device:devicesFound) {
                            tvResult.append("Device " + device.hostname);
                            tvResult.append("IP : " + device.ip + "\n");
                            tvResult.append("Mack : " + device.mac + "\n");
                            tvResult.append("\n");
                        }
                    }
                });

              /*  appendResultsText("Finished "+timeTaken+" s");
                setEnabled(subnetDevicesButton, true);*/
            }
        });

        // Below is example of how to cancel a running scan
        // subnetDevices.cancel();

    }

}

here is the xml file for the example

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:textSize="25sp"
        android:layout_margin="10dp"
        android:textColor="#A213BA"
        android:text="https://www.rrtutors.com/"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/WifiState"
        android:layout_width="match_parent"
        android:layout_margin="10dp"
        android:textSize="25sp"
        android:textColor="#088E81"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:layout_margin="10dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:text="Scanning: "/>
        <TextView
            android:id="@+id/Scanning"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:textColor="#0AEC13"
            android:textStyle="italic"/>
    </LinearLayout>

    <TextView
        android:id="@+id/Result"
        android:layout_width="match_parent"
        android:layout_margin="10dp"
        android:textSize="25sp"
        android:textColor="#000"
        android:layout_height="wrap_content"
        android:textStyle="bold"/>

</LinearLayout>

In this sample we can also get the Wifi State of connected network by

WifiManager wifiManager =
        (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
tvWifiState.setText(readtvWifiState(wifiManager));

private String readtvWifiState(WifiManager wm){
    String result = "";
    switch (wm.getWifiState()){
        case WifiManager.WIFI_STATE_DISABLED:
            result = "WIFI_STATE_DISABLED";
            break;
        case WifiManager.WIFI_STATE_DISABLING:
            result = "WIFI_STATE_DISABLING";
            break;
        case WifiManager.WIFI_STATE_ENABLED:
            result = "WIFI_STATE_ENABLED";
            break;
        case WifiManager.WIFI_STATE_ENABLING:
            result = "WIFI_STATE_ENABLING";
            break;
        case WifiManager.WIFI_STATE_UNKNOWN:
            result = "WIFI_STATE_UNKNOWN";
            break;
        default:
    }
    return result;
}

Step 5: Now run the application

Other Libraries to check Connected Devices in same Network in Android Programatically

Android Network Discovery

Wifi2Manager

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