Android Open Source - Bluetooth Bluetooth Handler S P P

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License

The source code is released under:
GNU General Public License
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Java Source Code

package heck.pinball.ghostscanner;
/*  w ww .j av a2s .c  o m*/
/**
 * Created by Technician on 5/6/14.
 */

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.util.Log;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;

public class BluetoothHandlerSPP{

   private final String TAG = getClass().getSimpleName();

   private static final boolean D = true;

   public enum State {
      NONE, LISTEN, CONNECTING, CONNECTED;
   }

   // name for the sdp record when creating server socket
   private static final String NAME = "BluetoothTest";

   // unique UUID for this app
   private static final UUID SPP_UUID = UUID
       .fromString("00001101-0000-1000-8000-00805F9B34FB");

   // member fields
   private final BluetoothAdapter mAdapter;

   private final BluetoothHandler mHandler;

   private AcceptThread mAcceptThread;

   private ConnectThread mConnectThread;

   private ConnectedThread mConnectedThread;

   private State mState;

   private Context mContext;

   private String inMessage = "";

   // constructor prepares new bluetooth spp session
   public BluetoothHandlerSPP(Context context, BluetoothHandler handler) {

      mContext = context;
      mAdapter = BluetoothAdapter.getDefaultAdapter();
      mState = State.NONE;
      mHandler = handler;
   }

   // set the current state of the connection
   private synchronized void setState(State state) {
      if (D)
         Log.d(TAG, "setState() " + mState + " -> " + state);
      mState = state;

      // give new state to handler so ui can update
      mHandler.obtainMessage(BluetoothHandler.MessageType.STATE, -1, state)
          .sendToTarget();
   }

   // return conn state
   public synchronized State getState() {
      return mState;
   }

   public synchronized String getMessage() {
      String returnMessage = inMessage;
      inMessage = "";
      return returnMessage;
    /*
     * byte[] tempBytes = new byte[byteIndex]; for (int i = 0; i <
     * byteIndex; i++){ tempBytes[i] = inBytes[i]; inBytes[i] = 0; }
     * byteIndex = 0; return tempBytes;
     */
   }

   // start session. start acceptthread to begin a session in listening(server)
   // mode.

   public synchronized void start() {
      if (D)
         Log.d(TAG, "start");

      // cancel any thread attempting to make a connection
      if (mConnectThread != null) {
         mConnectThread.cancel();
         mConnectThread = null;
      }

      if (mConnectedThread != null) {
         mConnectedThread.cancel();
         mConnectedThread = null;
      }

      // start the thread to listen
      if (mAcceptThread == null) {
         mAcceptThread = new AcceptThread();
         mAcceptThread.start();
      }
      setState(State.LISTEN);
   }

   // start the connectthread to initiate a connection
   public synchronized void connect(BluetoothDevice device) {
      if (D)
         Log.d(TAG, "connect to: " + device);

      // cancel any thread attempting to make a connection
      if (mState == State.CONNECTING) {
         if (mConnectThread != null) {
            mConnectThread.cancel();
            mConnectThread = null;
         }
      }

      // cancel any thread currently running a connection
      if (mConnectedThread != null) {
         mConnectedThread.cancel();
         mConnectedThread = null;
      }

      // start the thread to conect with the given device
      mConnectThread = new ConnectThread(device);
      mConnectThread.start();
      setState(State.CONNECTING);
   }

   // start connectedThread to begin mananging a bluetooth connection

   private synchronized void connected(BluetoothSocket socket,
                                       BluetoothDevice device) {
      if (D)
         Log.d(TAG, "connected");

      // cancel the thread that completed this connection
      if (mConnectThread != null) {
         mConnectThread.cancel();
         mConnectThread = null;
      }

      // cancel any thread currently currning a connection
      if (mConnectedThread != null) {
         mConnectedThread.cancel();
         mConnectedThread = null;
      }

      // cancel the accept thread because we only want to connect to one
      // device
      if (mAcceptThread != null) {
         mAcceptThread.cancel();
         mAcceptThread = null;
      }

      // start the thread to manage the connection and perform transmissions
      mConnectedThread = new ConnectedThread(socket);
      mConnectedThread.start();

      // send the name of the device back to the UI
      mHandler.obtainMessage(BluetoothHandler.MessageType.DEVICE, -1,
          device.getName()).sendToTarget();
      setState(State.CONNECTED);

   }

   // stop all threads
   public synchronized void stop() {
      if (D)
         Log.d(TAG, "stop");

      if (mConnectThread != null) {
         mConnectThread.cancel();
         mConnectThread = null;
      }

      if (mConnectedThread != null) {
         mConnectedThread.cancel();
         mConnectedThread = null;
      }

      if (mAcceptThread != null) {
         mAcceptThread.cancel();
         mAcceptThread = null;
      }

      setState(State.NONE);
   }

   // write to the connected thread
   public void write(byte[] out) {
      ConnectedThread r;

      // synchronize a copy of connectedthread
      synchronized (this) {
         if (mState != State.CONNECTED)
            return;
         r = mConnectedThread;
      }

      // preform write unsynchronized
      Log.d(TAG, "WRITING " + out);
      r.write(out);
   }

   // write to the connected thread
   public void write(byte[] out, int length) {
      ConnectedThread r;
      byte[] tempBytes = new byte[length];

      for (int i = 0; i < length; i++) {
         tempBytes[i] = out[i];
      }
      // synchronize a copy of connectedthread
      synchronized (this) {
         if (mState != State.CONNECTED)
            return;
         r = mConnectedThread;
      }

      // preform write unsynchronized
      // Log.d(TAG, "WRITING " + out);
      r.write(tempBytes);
   }

   // write string
   public void write(String out) {
      ConnectedThread r;

      // synchronize a copy of connectedthread
      synchronized (this) {
         if (mState != State.CONNECTED)
            return;
         r = mConnectedThread;
      }

      Log.d(TAG, "WRITING " + out);
      r.write(out.getBytes());
   }

   private void sendErrorMessage(int messageId) {
      setState(State.LISTEN);
      mHandler.obtainMessage(BluetoothHandler.MessageType.NOTIFY, -1,
          mContext.getResources().getString(messageId)).sendToTarget();
   }

   // listen for incoming connections
   private class AcceptThread extends Thread {
      // local server socket
      private final BluetoothServerSocket mmServerSocket;

      public AcceptThread() {
         BluetoothServerSocket tmp = null;

         // create a new listening server socket
         try {
            tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME,
                SPP_UUID);
         } catch (IOException e) {
            Log.e(TAG, "listen() failed", e);
         }
         mmServerSocket = tmp;
      }

      public void run() {
         if (D)
            Log.d(TAG, "BEGIN mAcceptedThread" + this);
         setName("AcceptThread");
         BluetoothSocket socket = null;

         // listen to the server socket if we're not connected
         while (mState != BluetoothHandlerSPP.State.CONNECTED) {
            try {
               // this is a blocking call and will only return on a
               // successful
               // connection or exception
               socket = mmServerSocket.accept();
            } catch (IOException e) {
               Log.e(TAG, "accept() failed", e);
               break;
            }

            // if connection accepted
            if (socket != null) {
               synchronized (BluetoothHandlerSPP.this) {
                  switch (mState) {
                     case LISTEN:
                     case CONNECTING:
                        // situation normal. start the connected thread.
                        connected(socket, socket.getRemoteDevice());
                        break;
                     case NONE:
                     case CONNECTED:
                        // either not ready or alread connected
                        // terminate new socket
                        try {
                           socket.close();
                        } catch (IOException e) {
                           Log.e(TAG, "Could not close unwanted socket", e);
                        }
                        break;
                  }
               }
            }
         }
         if (D)
            Log.i(TAG, "END mAcceptThread");
      }

      public void cancel() {
         if (D)
            Log.d(TAG, "cancel " + this);

         try {
            mmServerSocket.close();
         } catch (IOException e) {
            Log.e(TAG, "close() of server failed", e);
         }
      }
   }

   // this thread runs while attempting to make an outgoing connection with
   // a device
   private class ConnectThread extends Thread {
      private final BluetoothSocket mmSocket;

      private final BluetoothDevice mmDevice;

      public ConnectThread(BluetoothDevice device) {
         mmDevice = device;
         BluetoothSocket tmp = null;

         // get a bluetoothsocket for a connection with device
         try {
            tmp = device.createRfcommSocketToServiceRecord(SPP_UUID);
         } catch (IOException e) {
            Log.e(TAG, "create() failed", e);
         }
         mmSocket = tmp;
      }

      public void run() {
         Log.i(TAG, "BEGIN mConnectThread");
         setName("ConnectThread");

         // always cancel discovery because it will slow down a
         // connection
         mAdapter.cancelDiscovery();

         // make a connection
         try {
            // this is a blocking call, will only return on success or
            // exception
            mmSocket.connect();
         } catch (IOException e) {
            sendErrorMessage(R.string.bt_unable);
            // close socket
            try {
               mmSocket.close();
            } catch (IOException e2) {
               Log.e(TAG,
                   "unable to close() socket durring connection failure",
                   e2);
            }
            // start service or restart listening
            BluetoothHandlerSPP.this.start();
            return;
         }

         // reset the connectthread
         synchronized (BluetoothHandlerSPP.this) {
            mConnectThread = null;
         }

         // start the connected thread
         connected(mmSocket, mmDevice);

      }

      public void cancel() {
         try {
            mmSocket.close();
         } catch (IOException e) {
            Log.e(TAG, "close() of connect socket failed", e);
         }
      }

   }

   // this thread runs during a connection with a remote device
   private class ConnectedThread extends Thread {
      private final BluetoothSocket mmSocket;

      private final InputStream mmInStream;

      private final OutputStream mmOutStream;

      public ConnectedThread(BluetoothSocket socket) {
         Log.d(TAG, "create ConnectedThread");
         mmSocket = socket;
         InputStream tmpIn = null;
         OutputStream tmpOut = null;

         // get the bluetoothsocket input and output streams
         try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
         } catch (IOException e) {
            Log.e(TAG, "temp sockets not created", e);
         }

         mmInStream = tmpIn;
         mmOutStream = tmpOut;
      }

      public void run() {
         Log.i(TAG, "BEGIN mConnectedThread");
         int bytes;
         byte[] buffer = new byte[1024];

         // keep listening while connected
         while (true) {
            try {
               // try read
               bytes = mmInStream.read(buffer);
          /*
           * for (int i = 0; i < bytes; i++){ inBytes[(byteIndex + i)]
           * = buffer[i]; } byteIndex = byteIndex + bytes;
           */
               inMessage = inMessage.concat(new String(buffer, 0, bytes));

               // send to UI Activity
               mHandler.obtainMessage(BluetoothHandler.MessageType.READ,
                   bytes, buffer).sendToTarget();
            } catch (IOException e) {
               Log.e(TAG, "disconnected", e);
               sendErrorMessage(R.string.bt_connection_lost);
               break;
            }
         }
      }

      // write to output stream
      public void write(byte[] buffer) {
         try {
            mmOutStream.write(buffer);

            // share message with UI Activity
            mHandler.obtainMessage(BluetoothHandler.MessageType.WRITE, -1,
                buffer).sendToTarget();
         } catch (IOException e) {
            Log.e(TAG, "Exception during write", e);
         }
      }

      public void cancel() {
         try {
            mmSocket.close();
         } catch (IOException e) {
            Log.e(TAG, "close() of connect socket failed", e);
         }
      }

   }

}
Java Source Code List
