Get Wifi Details : Android Programming

Below is an Example of getting Wifi Details like: SSID, IP address, Mac address and Link Speed in Android Programming

   <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:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="@string/wifiDetails"
            android:id="@+id/wifiDetails" />
    </LinearLayout>

package com.code2care.tools.wifidetails;

import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.TextView;

import com.code2care.tools.detectphoneshakes.R;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class MainActivity extends ActionBarActivity  {

   private TextView wifiDetails;
   private String data;
   private String ipAddressValue;

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

        wifiDetails = (TextView)findViewById(R.id.wifiDetails);

        data ="";

        WifiManager mWifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
        WifiInfo connInfo = mWifiManager.getConnectionInfo();

        //Get IP Address
        int ipAddress = connInfo.getIpAddress();

        //Converting IP address from hex to decimal
        ipAddressValue = String.format("%d.%d.%d.%d",
                (ipAddress & 0xff),
                (ipAddress >> 8 & 0xff),
                (ipAddress >> 16 & 0xff),
                (ipAddress >> 24 & 0xff));

        final int NumOfRSSILevels = 5;

        HashMap<String,String> wifiInfo = new HashMap<String,String>();

        /* Returns the service set identifier (SSID) of the current 802.11 networks.
          If the SSID can be decoded as UTF-8, it will be returned surrounded by double quotation marks.
          Otherwise, it is returned as a string of hex digits.
          The SSID may be null if there is no network currently connected. */

        wifiInfo.put("SSID", connInfo.getSSID());
        wifiInfo.put("IP Address", ipAddressValue + "");
        wifiInfo.put("MAC Address", connInfo.getMacAddress());
        wifiInfo.put("LinkSpeed", connInfo.getLinkSpeed() + WifiInfo.LINK_SPEED_UNITS);

        Iterator it = wifiInfo.entrySet().iterator();

        while (it.hasNext()) {
            Map.Entry pair = (Map.Entry)it.next();
            data = data + pair.getKey() + " : " + pair.getValue() + "\n";
            it.remove();
        }
        wifiDetails.setText(data);
    }

}

Kotlin Example

 package com.code2care.tools.wifidetails

    import android.content.Context
    import android.net.wifi.WifiInfo
    import android.net.wifi.WifiManager
    import android.os.Bundle
    import androidx.appcompat.app.AppCompatActivity
    import kotlinx.android.synthetic.main.activity_main.*

    class MainActivity : AppCompatActivity() {

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)

            val wifiManager = getSystemService(Context.WIFI_SERVICE) as WifiManager
            val connInfo: WifiInfo = wifiManager.connectionInfo

            val ipAddress = connInfo.ipAddress
            val ipAddressValue = String.format("%d.%d.%d.%d",
                (ipAddress and 0xff),
                (ipAddress shr 8 and 0xff),
                (ipAddress shr 16 and 0xff),
                (ipAddress shr 24 and 0xff))

            val wifiInfo = HashMap()
            wifiInfo["SSID"] = connInfo.ssid ?: "N/A"
            wifiInfo["IP Address"] = ipAddressValue
            wifiInfo["MAC Address"] = connInfo.macAddress ?: "N/A"
            wifiInfo["LinkSpeed"] = "${connInfo.linkSpeed} ${WifiInfo.LINK_SPEED_UNITS}"

            val data = wifiInfo.entries.joinToString("\n") { "${it.key} : ${it.value}" }
            wifiDetails.text = data
        }
    }
    */

}

Note : Do not forget to add user permission for <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> or else you make get the below error in console,

04-03 17:46:56.209
603-603/com.code2care.tools.detectphoneshakes E/AndroidRuntime? 
FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity 
ComponentInfo{com.code2care.tools.wifidetection/com.code2care.tools.wifidetection.MainActivity}:
    java.lang.SecurityException: WifiService: Neither user 10101 nor current process 
    has android.permission.ACCESS_WIFI_STATE.
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1667)
            at android.app.ActivityThread.access$1500(ActivityThread.java:117)
            at android.app.ActivityThread$handleMessage(ActivityThread.java:935)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.SecurityException: WifiService: Neither user 10101 nor 
     current process has android.permission.ACCESS_WIFI_STATE.
            at android.os.Parcel.readException(Parcel.java:1322)
            at android.os.Parcel.readException(Parcel.java:1276)
            at android.net.wifi.IWifiManager$Stub$Proxy.getConnectionInfo(IWifiManager.java:1035)
            at android.net.wifi.WifiManager.getConnectionInfo(WifiManager.java:740)
            at com.code2care.tools.detectphoneshakes.MainActivity.onCreate(MainActivity.java:32)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
            at java.lang.reflect.Method.invokeNative(Method.java:507)
            at android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
            at android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
            at dalvik.system.NativeStart.main(Native Method)