MainActivity.java

package edu.cs4730.btDemo;

import java.util.UUID;

import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;

/*
 * most of the work is done in the fragments.  You will need to install this example onto 2 devices
 * with bluetooth in order to make this example work.
 *
 * The help fragment starts up first, to check and see if this example will work.
 * Server fragment is the for the "server" code version with bluetooth.
 * Client fragment is will connect to the server code.
 */

public class MainActivity extends AppCompatActivity implements Help_Fragment.OnFragmentInteractionListener {

    public static final UUID MY_UUID = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
    public static final String NAME = "BluetoothDemo";

    FragmentManager fragmentManager;

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

        fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.frag_container, new Help_Fragment()).commit();

    }

    @Override
    public void onButtonSelected(int id) {

        FragmentTransaction transaction = fragmentManager.beginTransaction();
        // Replace whatever is in the fragment_container view with this fragment,
        if (id == 2) { //client
            transaction.replace(R.id.frag_container, new Client_Fragment());
        } else { //server
            transaction.replace(R.id.frag_container, new Server_Fragment());
        }
        // and add the transaction to the back stack so the user can navigate back
        transaction.addToBackStack(null);
        // Commit the transaction
        transaction.commit();
    }

}