Android Open Source - bluetooth Server_ Fragment

• Back to Hardware/bluetooth  ↑

From Project

Back to project page bluetooth.

License

The source code is released under:

Apache License

Java Source Code

package edu.cs4730.btDemo;
//  ww  w  .  j  a  v  a  2 s  .co m
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

/**
 * A simple {@link Fragment} subclass.
 * 
 */
public class Server_Fragment extends Fragment {

  BluetoothAdapter mBluetoothAdapter =null;

  TextView output;
  Button btn_start;

  public Server_Fragment() {
    // Required empty public constructor
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View myView = inflater.inflate(R.layout.fragment_server, container, false);
    //text field for output info.
    output = (TextView) myView.findViewById(R.id.sv_output);

    btn_start = (Button) myView.findViewById(R.id.start_server);

    btn_start.setOnClickListener( new View.OnClickListener(){
      @Override
      public void onClick(View v) {
        output.append("Starting server\n");
         startServer();
      }
    });


    //setup the bluetooth adapter.
    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (mBluetoothAdapter == null) {
      // Device does not support Bluetooth
      output.append("No bluetooth device.\n");
      btn_start.setEnabled(false);
    }

    return myView;
  }

  private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      output.append(msg.getData().getString("msg"));
    }

  };
  public void mkmsg(String str) {
    //handler junk, because thread can't update screen!
    Message msg = new Message();
    Bundle b = new Bundle();
    b.putString("msg", str);
    msg.setData(b);
    handler.sendMessage(msg);
  }

  public void startServer() {
    new Thread(new AcceptThread()).start();

  }

  /**
   * This thread runs while listening for incoming connections. It behaves
   * like a server-side client. It runs until a connection is accepted
   * (or until cancelled).
   */
  private class AcceptThread extends Thread {
    // The local server socket
    private final BluetoothServerSocket mmServerSocket;

    public AcceptThread() {
      BluetoothServerSocket tmp = null;
      // Create a new listening server socket
      try {
        tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(MainActivity.NAME, MainActivity.MY_UUID);
      } catch (IOException e) {
        mkmsg("Failed to start server\n");
      }
      mmServerSocket = tmp;
    }
    public void run() {
      mkmsg("waiting on accept");
      BluetoothSocket socket = null;
      try {
        // This is a blocking call and will only return on a
        // successful connection or an exception
        socket = mmServerSocket.accept();
      } catch (IOException e) {
        mkmsg("Failed to accept\n");
      }

      // If a connection was accepted
      if (socket != null) {
        mkmsg("Connection made\n");
        mkmsg("Remote device address: "+socket.getRemoteDevice().getAddress().toString()+"\n");
        //Note this is copied from the TCPdemo code.
        try {
          mkmsg("Attempting to receive a message ...\n"); 
          BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); 
          String str = in.readLine();
          mkmsg("received a message:\n" + str+"\n");

          PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
          mkmsg("Attempting to send message ...\n");                 
          out.println("Reponse from Bluetooth Demo Server");
          out.flush();
          mkmsg("Message sent...\n");

          mkmsg("We are done, closing connection\n");
        } catch(Exception e) {
          mkmsg("Error happened sending/receiving\n");

        } finally {
          try {
            socket.close();
          } catch (IOException e) {
            mkmsg("Unable to close socket"+e.getMessage()+"\n");
          }
        }
      } else {
        mkmsg("Made connection, but socket is null\n");
      }
      mkmsg("Server ending \n");
    }

    public void cancel() {
      try {
        mmServerSocket.close();
      } catch (IOException e) {

      }
    }
  }

}

Java Source Code List

• Back to Hardware/bluetooth  ↑