Connecting WiFi programmatically

MainActivity.kt

package example.siva.com.hellokotlin

import android.content.BroadcastReceiver
import android.content.Context
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import kotlinx.android.synthetic.main.activity_main.*
import org.jetbrains.anko.toast
import android.net.wifi.WifiConfiguration
import android.net.wifi.WifiManager
import android.widget.Toast
import android.content.Intent
import android.net.NetworkInfo
import android.net.wifi.WifiInfo


class MainActivity : AppCompatActivity()  {
     val TAG:String="MainActivity";
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        helloMe.setOnClickListener{
            toast("Changing wifi to "+Config.SSID)
            connectToWPAWiFi(Config.SSID,Config.PASS)
        }

    }
    //connects to the given ssid
    fun connectToWPAWiFi(ssid:String,pass:String){
        if(isConnectedTo(ssid)){ //see if we are already connected to the given ssid
            toast("Connected to"+ssid)
            return
        }
        val wm:WifiManager= applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
            var wifiConfig=getWiFiConfig(ssid)
            if(wifiConfig==null){//if the given ssid is not present in the WiFiConfig, create a config for it
               createWPAProfile(ssid,pass)
                wifiConfig=getWiFiConfig(ssid)
            }
        wm.disconnect()
        wm.enableNetwork(wifiConfig!!.networkId,true)
        wm.reconnect()
        Log.d(TAG,"intiated connection to SSID"+ssid);
    }
    fun isConnectedTo(ssid: String):Boolean{
        val wm:WifiManager= applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
        if(wm.connectionInfo.ssid == ssid){
            return true
        }
        return false
    }
    fun getWiFiConfig(ssid: String): WifiConfiguration? {
        val wm:WifiManager= applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
        val wifiList=wm.configuredNetworks
        for (item in wifiList){
            if(item.SSID != null && item.SSID.equals(ssid)){
                return item
            }
        }
        return null
    }
    fun createWPAProfile(ssid: String,pass: String){
        Log.d(TAG,"Saving SSID :"+ssid)
        val conf = WifiConfiguration()
        conf.SSID = ssid
        conf.preSharedKey = pass
        val wm:WifiManager= applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
        wm.addNetwork(conf)
        Log.d(TAG,"saved SSID to WiFiManger")
    }

    class WiFiChngBrdRcr : BroadcastReceiver(){ // shows a toast message to the user when device is connected to a AP
        private val TAG = "WiFiChngBrdRcr"
        override fun onReceive(context: Context, intent: Intent) {
            val networkInfo=intent.getParcelableExtra<NetworkInfo>(WifiManager.EXTRA_NETWORK_INFO)
            if(networkInfo.state == NetworkInfo.State.CONNECTED){
                val bssid=intent.getStringExtra(WifiManager.EXTRA_BSSID)
                Log.d(TAG, "Connected to BSSID:"+bssid)
                val ssid=intent.getParcelableExtra<WifiInfo>(WifiManager.EXTRA_WIFI_INFO).ssid
                val log="Connected to SSID:"+ssid
                Log.d(TAG,"Connected to SSID:"+ssid)
                Toast.makeText(context, log, Toast.LENGTH_SHORT).show()
            }
        }
    }
}