Vpn app for 4.1

package com.example.vpnapp;

import android.app.Activity;
import android.content.Intent;
import android.net.VpnService;
import android.os.Bundle;
import android.util.Log;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class VpnActivity extends Activity {
private static final String TAG = “VpnActivity”;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    startVpnService();
}

private void startVpnService() {
    Intent intent = VpnService.prepare(this);
    if (intent != null) {
        startActivityForResult(intent, 0);
    } else {
        establishVpn();
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        establishVpn();
    } else {
        Log.e(TAG, "VPN permission denied");
    }
}

private void establishVpn() {
    try {
        VpnService.Builder builder = new VpnService.Builder();
        builder.addAddress("10.0.0.2", 24); // Example IP address
        builder.addDnsServer("dns2.emmanuel2507.nas64.de");
        builder.setSession("MyVPNService");
        builder.setBlocking(true);
        builder.establish();
        Log.i(TAG, "VPN established");
    } catch (Exception e) {
        Log.e(TAG, "Error establishing VPN", e);
    }
}

}