<!-- AndroidManifest.xml -->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

<!-- activity_main.xml -->
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:padding="16dp"
    android:layout_gravity="center"
    android:gravity="center">

    <TextView
        android:id="@+id/wifi_state"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Change WiFi State"
        android:textStyle="bold"
        android:textSize="28sp"
        android:textColor="#000000"
        android:gravity="center"
        android:layout_marginBottom="40dp"/>

    <Button
        android:id="@+id/wifi_on"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/wifi_state"
        android:text="WiFi ON"
        android:textAllCaps="false"
        android:textColor="@color/colorWhite"
        android:background="@color/colorPrimaryDark"
        android:layout_marginBottom="10dp"/>

    <Button
        android:id="@+id/wifi_off"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/wifi_on"
        android:text="WiFi OFF"
        android:textAllCaps="false"
        android:textColor="@color/colorWhite"
        android:background="@color/colorPrimaryDark"
        android:layout_marginBottom="10dp"/>
</RelativeLayout>
                                    
                                  

                                    
                                        import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    TextView wifiState;
    Button bWiFiOn, bWiFiOff;

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

        wifiState = findViewById(R.id.wifi_state);
        bWiFiOn = findViewById(R.id.wifi_on);
        bWiFiOff = findViewById(R.id.wifi_off);

        bWiFiOn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
                wifiManager.setWifiEnabled(true);
                Toast.makeText(getApplicationContext(), "WiFi is ON", Toast.LENGTH_SHORT).show();
                wifiState.setText("WiFi is ON.");
            }
        });

        bWiFiOff.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
                wifiManager.setWifiEnabled(false);
                Toast.makeText(getApplicationContext(), "WiFi is OFF", Toast.LENGTH_SHORT).show();
                wifiState.setText("WiFi is OFF.");
            }
        });
    }
}
                                    
                                  

                                      
                                        import android.content.Context
import android.net.wifi.WifiManager
import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {

    private lateinit var wifiState: TextView
    private lateinit var bWiFiOn: Button
    private lateinit var bWiFiOff: Button

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

        wifiState = findViewById(R.id.wifi_state)
        bWiFiOn = findViewById(R.id.wifi_on)
        bWiFiOff = findViewById(R.id.wifi_off)

        bWiFiOn.setOnClickListener {
            val wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
            wifiManager.isWifiEnabled = true
            Toast.makeText(applicationContext, "WiFi is ON", Toast.LENGTH_SHORT).show()
            wifiState.text = "WiFi is ON."
        }

        bWiFiOff.setOnClickListener {
            val wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
            wifiManager.isWifiEnabled = false
            Toast.makeText(applicationContext, "WiFi is OFF", Toast.LENGTH_SHORT).show()
            wifiState.text = "WiFi is OFF."
        }
    }
}