Btukfyl

I'm looking for a way to change DNS on Android, so I found a tutorial showing how to create a VPN connection. Once implemented, I can initiate this VPN connection in my app at the click of a button, but I can not do the opposite: disable this connection by clicking another button. How can I do that?

Procedure calling the service:

public void vpn() {

    Intent intent = android.net.VpnService.prepare(getApplicationContext());



    if (intent != null) {

        startActivityForResult(intent, 0);

    } else {

        onActivityResult(0, RESULT_OK, null);

    }

}



protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (resultCode == RESULT_OK) {

        Intent intent = new Intent(this, DNSVpnService.class);

        startService(intent);

        Toast.makeText(getBaseContext(), "OpenDNS Ativado", Toast.LENGTH_SHORT).show();

    }

}

DNSVpnService class:

public class DNSVpnService extends android.net.VpnService {



    private Thread mThread;

    private ParcelFileDescriptor mInterface;

    //a. Configure a builder for the interface.

    Builder builder = new Builder();



    // Services interface

    @Override

    public int onStartCommand(Intent intent, int flags, int startId) {

        // Start a new session by creating a new thread.

        mThread = new Thread(new Runnable() {

            @Override

            public void run() {

                try {

                    //a. Configure the TUN and get the interface.

                    mInterface = builder.setSession("OpenDNS")

                            .addAddress("192.168.0.1", 24)

                            .addDnsServer("208.67.222.222")

                            //.addRoute("0.0.0.0", 0)

                            .establish();

                    //b. Packets to be sent are queued in this input stream.

                    FileInputStream in = new FileInputStream(

                            mInterface.getFileDescriptor());

                    //b. Packets received need to be written to this output stream.

                    FileOutputStream out = new FileOutputStream(

                            mInterface.getFileDescriptor());

                    //c. The UDP channel can be used to pass/get ip package to/from server

                    DatagramChannel tunnel = DatagramChannel.open();

                    // Connect to the server, localhost is used for demonstration only.

                    tunnel.connect(new InetSocketAddress("127.0.0.1", 8087));

                    //d. Protect this socket, so package send by it will not be feedback to the vpn service.

                    protect(tunnel.socket());

                    //e. Use a loop to pass packets.

                    while (true) {

                        //get packet with in

                        //put packet to tunnel

                        //get packet form tunnel

                        //return packet with out

                        //sleep is a must

                        Thread.sleep(100);

                    }



                } catch (Exception e) {

                    // Catch any exception

                    e.printStackTrace();

                } finally {

                    try {

                        if (mInterface != null) {

                            mInterface.close();

                            mInterface = null;

                        }

                    } catch (Exception e) {



                    }

                }

            }



        }, "OpenDNS");



        //start the service

        mThread.start();

        return START_STICKY;

    }



    @Override

    public void onDestroy() {

        // TODO Auto-generated method stub

        if (mThread != null) {

            mThread.interrupt();

        }

        super.onDestroy();

    }

}

Sorry, but I'm very newbie and would like examples ...