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<RelativeLayout 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"

    tools:context=".MainActivity" >

    <ToggleButton

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/a"

        android:id="@+id/toggleButton"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true" />

</RelativeLayout>

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package com.umiitkose.myapplication;

        import android.bluetooth.BluetoothAdapter;

        import android.content.Context;

        import android.content.Intent;

        import android.graphics.Bitmap;

        import android.media.MediaRecorder;

        import android.net.Uri;

        import android.net.wifi.WifiManager;

        import android.os.Bundle;

        import android.app.Activity;

        import android.provider.MediaStore;

        import android.view.View;

        import android.widget.Button;

        import android.widget.CheckBox;

        import android.widget.Toast;

        import android.widget.ToggleButton;

public class MainActivity extends Activity {

WifiManager modem=null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        final ToggleButton btn=(ToggleButton)findViewById(R.id.toggleButton);

        btn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                if(btn.isChecked()){

                   wifiAc();

                }

                else

                    wifiKapat();

            }

        });

}

    private void wifiAc(){

        modem=(WifiManager)getSystemService(Context.WIFI_SERVICE);

        if(modem.getWifiState()== WifiManager.WIFI_STATE_DISABLED){

            modem.setWifiEnabled(true);

            }else if(modem.getWifiState()==WifiManager.WIFI_STATE_ENABLING){

            Toast.makeText(MainActivity.this, "Açık", Toast.LENGTH_SHORT).show();

        }

    }

    private void wifiKapat(){

        modem=(WifiManager)getSystemService(Context.WIFI_SERVICE);

        if(modem.getWifiState()== WifiManager.WIFI_STATE_ENABLED){

            modem.setWifiEnabled(false);

        }else if(modem.getWifiState()==WifiManager.WIFI_STATE_DISABLING){

            Toast.makeText(MainActivity.this, "Zaten Kapalı", Toast.LENGTH_SHORT).show();

        }

    }

}

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

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