Android 블 루 투 스 통신 채 팅 발송 및 수용 기능 구현

좋 은 블 루 투 스 통신 demo 는 발송 과 수용 기능 을 실현 하고 두 가지 유형 으로 이 루어 졌 습 니 다.구체 적 인 내용 은 다음 과 같 습 니 다.
생각 을 말 해 보 세 요.주로 두 가지 메 인 인터페이스 류 와 블 루 투 스 채 팅 서비스 류 가 있 습 니 다. 。 먼저 스 레 드 를 만 드 는 것 은 실제 적 으로 BluetoothChatService()(블 루 투 스 채 팅 서비스 클래스)를 만 드 는 것 입 니 다.이때 handler 를 보 내 면 UI 인터페이스 를 조작 할 수 있 습 니 다.스 레 드 에서 블 루 투 스 메 시 지 를 계속 문의 하고 읽 습 니 다.메 인 인터페이스 에서 보 내기 단 추 를 누 를 때 BluetoothChatService 의 보 내 는 방법 write 방법 을 사용 합 니 다.여기 서 write 방법 은 handler 로 메 시 지 를 보 냅 니 다.메 인 인터페이스 에 따 르 면 다른 클 라 이언 트 가 블 루 투 스 메 시 지 를 계속 읽 는 것 과 유사 한 read 방법 이 인터페이스 에 똑 같이 나타 나 통신 을 완성 했다.

import java.util.ArrayList;
import java.util.Set;

import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class BluetoothChat extends Activity {

  // Message types sent from the BluetoothChatService Handler
  public static final int MESSAGE_STATE_CHANGE = 1;
  public static final int MESSAGE_READ = 2;
  public static final int MESSAGE_WRITE = 3;
  public static final int MESSAGE_DEVICE_NAME = 4;
  public static final int MESSAGE_TOAST = 5;

  // Key names received from the BluetoothChatService Handler
  public static final String DEVICE_NAME = "device_name";
  public static final String TOAST = "toast";

  // Intent request codes
  private static final int REQUEST_CONNECT_DEVICE = 1;
  private static final int REQUEST_ENABLE_BT = 2;

  private TextView mTitle;
  private EditText text_chat;
  private EditText text_input;
  private Button but_On_Off;
  private Button but_search; // ------>         
  private Button but_create; // ------>       "    "
  private Button mSendButton;
  //            
  private String mConnectedDeviceName;
  // String buffer for outgoing messages
  private StringBuffer mOutStringBuffer;
  // Local Bluetooth adapter
  private BluetoothAdapter mBluetoothAdapter = null;
  // Member object for the chat services
  private BluetoothChatService mChatService = null;

  private ArrayList<String> mPairedDevicesList = new ArrayList<String>();
  private ArrayList<String> mNewDevicesList = new ArrayList<String>();
  private String[] strName;
  private String address;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
    setContentView(R.layout.main);

    mTitle = (TextView) this.findViewById(R.id.text_title);
    text_chat = (EditText) this.findViewById(R.id.text_chat);
    text_input = (EditText) this.findViewById(R.id.text_input);
    but_On_Off = (Button) this.findViewById(R.id.but_off_on);
    but_search = (Button) this.findViewById(R.id.but_search_div);
    but_create = (Button) this.findViewById(R.id.but_cjlj);
    mSendButton = (Button) this.findViewById(R.id.but_fsxx);

    //           
    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    //    null,        
    if (mBluetoothAdapter == null) {
      Toast.makeText(this, "      ", Toast.LENGTH_LONG).show();
      finish();
      return;
    }

    if (mBluetoothAdapter.isEnabled()) {
      but_On_Off.setText("    ");
    } else {
      but_On_Off.setText("    ");
    }

    but_On_Off.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        if (!mBluetoothAdapter.isEnabled()) {
          mBluetoothAdapter.enable();
          Toast.makeText(BluetoothChat.this, "     ",
              Toast.LENGTH_SHORT).show();
          but_On_Off.setText("    ");
        } else {
          mBluetoothAdapter.disable();
          Toast.makeText(BluetoothChat.this, "     ",
              Toast.LENGTH_SHORT).show();
          but_On_Off.setText("    ");
        }
      }
    });

    but_search.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        searchDevice();
      }
    });

    but_create.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {

        final EditText et = new EditText(BluetoothChat.this);
        et.setSingleLine();
        et.setText(mBluetoothAdapter.getName());

        new AlertDialog.Builder(BluetoothChat.this)
            .setTitle("      :")
            .setView(et)
            .setPositiveButton("  ",
                new DialogInterface.OnClickListener() {

                  @Override
                  public void onClick(DialogInterface dialog,
                      int which) {
                    String name = et.getText().toString()
                        .trim();
                    if (name.equals("")) {
                      Toast.makeText(BluetoothChat.this,
                          "      ",
                          Toast.LENGTH_SHORT).show();
                      return;
                    }
                    //      
                    mBluetoothAdapter.setName(name);
                  }

                })
            .setNegativeButton("  ",
                new DialogInterface.OnClickListener() {

                  @Override
                  public void onClick(DialogInterface dialog,
                      int which) {

                  }
                }).create().show();

        //     ,                      
        ensureDiscoverable();
      }
    });

    //               set  
    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
        .getBondedDevices();
    if (pairedDevices.size() > 0) {
      for (BluetoothDevice device : pairedDevices) {
        mPairedDevicesList.add("   :" + device.getName() + "
" + device.getAddress()); } } else { Toast.makeText(this, " ", Toast.LENGTH_SHORT).show(); } // IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); this.registerReceiver(mReceiver, filter); // filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); this.registerReceiver(mReceiver, filter); } @Override public void onStart() { super.onStart(); // If BT is not on, request that it be enabled. // setupChat() will then be called during onActivityResult if (!mBluetoothAdapter.isEnabled()) { Intent enableIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableIntent, REQUEST_ENABLE_BT); // Otherwise, setup the chat session } else { if (mChatService == null) setupChat(); } } @Override public synchronized void onResume() { super.onResume(); // Performing this check in onResume() covers the case in which BT was // not enabled during onStart(), so we were paused to enable it... // onResume() will be called when ACTION_REQUEST_ENABLE activity // returns. if (mChatService != null) { // Only if the state is STATE_NONE, do we know that we haven't // started already if (mChatService.getState() == BluetoothChatService.STATE_NONE) { // Start the Bluetooth chat services mChatService.start(); } } } private void setupChat() { mSendButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { // Send a message using content of the edit text widget String message = text_input.getText().toString(); sendMessage(message); } }); // Initialize the BluetoothChatService to perform bluetooth connections mChatService = new BluetoothChatService(this, mHandler); // Initialize the buffer for outgoing messages mOutStringBuffer = new StringBuffer(""); } @Override public void onDestroy() { super.onDestroy(); // Stop the Bluetooth chat services if (mChatService != null) mChatService.stop(); // Make sure we're not doing discovery anymore if (mBluetoothAdapter != null) { mBluetoothAdapter.cancelDiscovery(); } // Unregister broadcast listeners this.unregisterReceiver(mReceiver); } /** */ private void ensureDiscoverable() { if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) { Intent discoverableIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent.putExtra( BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); startActivity(discoverableIntent); } } /** * Sends a message. * * @param message * A string of text to send. */ private void sendMessage(String message) { // Check that we're actually connected before trying anything if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) { Toast.makeText(this, " ", Toast.LENGTH_SHORT).show(); return; } // Check that there's actually something to send if (message.length() > 0) { // Get the message bytes and tell the BluetoothChatService to write byte[] send = message.getBytes(); mChatService.write(send); // Reset out string buffer to zero and clear the edit text field mOutStringBuffer.setLength(0); text_input.setText(mOutStringBuffer); } } // The Handler that gets information back from the BluetoothChatService private final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MESSAGE_STATE_CHANGE: switch (msg.arg1) { case BluetoothChatService.STATE_CONNECTED: mTitle.setText(" "); mTitle.append(mConnectedDeviceName); // mConversationArrayAdapter.clear(); break; case BluetoothChatService.STATE_CONNECTING: mTitle.setText(" ..."); break; case BluetoothChatService.STATE_LISTEN: case BluetoothChatService.STATE_NONE: mTitle.setText(" "); break; } break; case MESSAGE_WRITE: byte[] writeBuf = (byte[]) msg.obj; // construct a string from the buffer String writeMessage = new String(writeBuf); // mConversationArrayAdapter.add("Me: " + writeMessage); text_chat.append(" :" + writeMessage + "
"); break; case MESSAGE_READ: byte[] readBuf = (byte[]) msg.obj; // construct a string from the valid bytes in the buffer String readMessage = new String(readBuf, 0, msg.arg1); // mConversationArrayAdapter.add(mConnectedDeviceName+": " + // readMessage); text_chat.append(mConnectedDeviceName + ":" + readMessage + "
"); break; case MESSAGE_DEVICE_NAME: // save the connected device's name mConnectedDeviceName = msg.getData().getString(DEVICE_NAME); Toast.makeText(getApplicationContext(), " " + mConnectedDeviceName, Toast.LENGTH_SHORT) .show(); break; case MESSAGE_TOAST: Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST), Toast.LENGTH_SHORT) .show(); break; } } }; // private void linkDevice() { if (mBluetoothAdapter.isDiscovering()) { mBluetoothAdapter.cancelDiscovery(); } int cou = mPairedDevicesList.size() + mNewDevicesList.size(); if (cou == 0) { Toast.makeText(BluetoothChat.this, " ", Toast.LENGTH_SHORT).show(); return; } // , strName = new String[cou]; for (int i = 0; i < mPairedDevicesList.size(); i++) { strName[i] = mPairedDevicesList.get(i); } for (int i = mPairedDevicesList.size(); i < strName.length; i++) { strName[i] = mNewDevicesList.get(i - mPairedDevicesList.size()); } address = strName[0].substring(strName[0].length() - 17); new AlertDialog.Builder(BluetoothChat.this) .setTitle(" :") .setSingleChoiceItems(strName, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // , MAC address = strName[which].split("\
")[1].trim(); } }) .setPositiveButton(" ", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (address == null) { Toast.makeText(BluetoothChat.this, " ", Toast.LENGTH_SHORT).show(); return; } Log.i("sxd", "address:" + address); // Get the BLuetoothDevice object BluetoothDevice device = mBluetoothAdapter .getRemoteDevice(address); // Attempt to connect to the device mChatService.connect(device); } }) .setNegativeButton(" ", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).create().show(); } // private void searchDevice() { mTitle.setText(" ..."); setProgressBarIndeterminateVisibility(true); if (mBluetoothAdapter.isDiscovering()) { mBluetoothAdapter.cancelDiscovery(); } mNewDevicesList.clear(); mBluetoothAdapter.startDiscovery(); } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(0, 1, 0, " "); menu.add(0, 2, 0, " "); return true; } private final BroadcastReceiver mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); // if (BluetoothDevice.ACTION_FOUND.equals(action)) { BluetoothDevice device = intent .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); // If it's already paired, skip it, because it's been listed // already if (device.getBondState() != BluetoothDevice.BOND_BONDED) { String s = " : " + device.getName() + "
" + device.getAddress(); if (!mNewDevicesList.contains(s)) mNewDevicesList.add(s); } // When discovery is finished, change the Activity title } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED .equals(action)) { setProgressBarIndeterminateVisibility(false); if (mNewDevicesList.size() == 0) { Toast.makeText(BluetoothChat.this, " ", Toast.LENGTH_SHORT).show(); } mTitle.setText(" "); linkDevice(); } } }; @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case 1: searchDevice(); return true; case 2: // Ensure this device is discoverable by others ensureDiscoverable(); return true; } return false; } }

package com.it2388.bluetooth;

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

/**
 * This class does all the work for setting up and managing Bluetooth
 * connections with other devices. It has a thread that listens for incoming
 * connections, a thread for connecting with a device, and a thread for
 * performing data transmissions when connected.
 * 
 * *         ,                。              ,             ,                 。
 */
public class BluetoothChatService {
  // Debugging
  private static final String TAG = "BluetoothChatService";
  private static final boolean D = true;

  // Name for the SDP record when creating server socket   SDP             
  private static final String NAME = "BluetoothChat";

  // Unique UUID for this application
  private static final UUID MY_UUID = UUID
      .fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");

  // Member fields
  private final BluetoothAdapter mAdapter;
  private final Handler mHandler;
  private AcceptThread mAcceptThread;
  private ConnectThread mConnectThread;
  private ConnectedThread mConnectedThread;
  private int mState;

  // Constants that indicate the current connection state
  public static final int STATE_NONE = 0; // we're doing nothing        
  public static final int STATE_LISTEN = 1; // now listening for incoming     
                        // connections
  public static final int STATE_CONNECTING = 2; // now initiating an outgoing
                          //       
                          // connection
  public static final int STATE_CONNECTED = 3; // now connected to a remote
                          //        
                          // device

  /**
   * Constructor. Prepares a new BluetoothChat session.
   * 
   * @param context
   *      The UI Activity Context
   * @param handler
   *      A Handler to send messages back to the UI Activity
   */
  public BluetoothChatService(Context context, Handler handler) {
    mAdapter = BluetoothAdapter.getDefaultAdapter();
    mState = STATE_NONE;
    mHandler = handler;
  }

  /**
   * Set the current state of the chat connection
   * 
   * @param state
   *      An integer defining the current connection state
   */
  private synchronized void setState(int state) {
    if (D)
      Log.d(TAG, "setState() " + mState + " -> " + state);
    mState = state;

    // Give the new state to the Handler so the UI Activity can update
    mHandler.obtainMessage(BluetoothChat.MESSAGE_STATE_CHANGE, state, -1)
        .sendToTarget();
  }

  /**
   * Return the current connection state.
   */
  public synchronized int getState() {
    return mState;
  }

  /**
   * Start the chat service. Specifically start AcceptThread to begin a
   * session in listening (server) mode. Called by the Activity onResume()
   */
  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;
    }

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

    // Start the thread to listen on a BluetoothServerSocket
    if (mAcceptThread == null) {
      mAcceptThread = new AcceptThread();
      mAcceptThread.start();
    }
    setState(STATE_LISTEN);
  }

  /**
   * Start the ConnectThread to initiate a connection to a remote device.
   * 
   * @param device
   *      The BluetoothDevice to connect
   */
  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 connect with the given device
    mConnectThread = new ConnectThread(device);
    mConnectThread.start();
    setState(STATE_CONNECTING);
  }

  /**
   * Start the ConnectedThread to begin managing a Bluetooth connection
   * 
   * @param socket
   *      The BluetoothSocket on which the connection was made
   * @param device
   *      The BluetoothDevice that has been connected
   */
  public synchronized void connected(BluetoothSocket socket,
      BluetoothDevice device) {
    if (D)
      Log.d(TAG, "connected");

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

    // Cancel any thread currently running 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 connected device back to the UI Activity
    Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_DEVICE_NAME);
    Bundle bundle = new Bundle();
    bundle.putString(BluetoothChat.DEVICE_NAME, device.getName());
    msg.setData(bundle);
    mHandler.sendMessage(msg);

    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 ConnectedThread in an unsynchronized manner
   * 
   * @param out
   *      The bytes to write
   * @see ConnectedThread#write(byte[])
   */
  public void write(byte[] out) {
    // Create temporary object
    ConnectedThread r;
    // Synchronize a copy of the ConnectedThread
    synchronized (this) {
      if (mState != STATE_CONNECTED)
        return;
      r = mConnectedThread;
    }
    // Perform the write unsynchronized
    r.write(out);
  }

  /**
   * Indicate that the connection attempt failed and notify the UI Activity.
   */
  private void connectionFailed() {
    setState(STATE_LISTEN);

    // Send a failure message back to the Activity
    Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
    Bundle bundle = new Bundle();
    bundle.putString(BluetoothChat.TOAST, "       ");
    msg.setData(bundle);
    mHandler.sendMessage(msg);
  }

  /**
   * Indicate that the connection was lost and notify the UI Activity.
   */
  private void connectionLost() {
    setState(STATE_LISTEN);

    // Send a failure message back to the Activity
    Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
    Bundle bundle = new Bundle();
    bundle.putString(BluetoothChat.TOAST, "      ");
    msg.setData(bundle);
    mHandler.sendMessage(msg);
  }

  /**
   * 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 = mAdapter
            .listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
      } catch (IOException e) {
        Log.e("sxd", " ======== ufcomm exception =======", e);
      }
      mmServerSocket = tmp;
    }

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

      // Listen to the server socket if we're not connected
      while (mState != STATE_CONNECTED) {
        try {
          // This is a blocking call and will only return on a
          // successful connection or an exception
          socket = mmServerSocket.accept();
        } catch (IOException e) {
          Log.e("sxd", "---> accept socket failed <---", e);
          break;
        }

        // If a connection was accepted
        if (socket != null) {
          synchronized (BluetoothChatService.this) {
            switch (mState) {
            case STATE_LISTEN:
            case STATE_CONNECTING:
              // Situation normal. Start the connected thread.
              connected(socket, socket.getRemoteDevice());
              break;
            case STATE_NONE:
            case STATE_CONNECTED:
              // Either not ready or already 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. It runs straight through; the connection either succeeds or
   * fails.
   */
  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 the
      // given BluetoothDevice
      try {
        tmp = device.createRfcommSocketToServiceRecord(MY_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 to the BluetoothSocket
      try {
        // This is a blocking call and will only return on a
        // successful connection or an exception
        mmSocket.connect();
      } catch (IOException e) {
        Log.e("sxd", "       ", e);
        connectionFailed();
        // Close the socket
        try {
          mmSocket.close();
        } catch (IOException e2) {
          Log.e(TAG,
              "unable to close() socket during connection failure",
              e2);
        }
        // Start the service over to restart listening mode
        BluetoothChatService.this.start();
        return;
      }

      // Reset the ConnectThread because we're done
      synchronized (BluetoothChatService.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. It handles all
   * incoming and outgoing transmissions.
   * 
   *                  
   */
  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");
      byte[] buffer = new byte[1024];
      int bytes;

      // Keep listening to the InputStream while connected
      while (true) {
        try {
          // Read from the InputStream
          bytes = mmInStream.read(buffer);

          // Send the obtained bytes to the UI Activity
          mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes,
              -1, buffer).sendToTarget();
        } catch (IOException e) {
          Log.e(TAG, "disconnected", e);
          connectionLost();
          break;
        }
      }
    }

    /**
     * Write to the connected OutStream.
     * 
     * @param buffer
     *      The bytes to write
     */
    public void write(byte[] buffer) {
      try {
        mmOutStream.write(buffer);

        // Share the sent message back to the UI Activity
        mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -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);
      }
    }
  }
}

이상 이 바로 본 고의 모든 내용 입 니 다.여러분 의 학습 에 도움 이 되 고 저 희 를 많이 응원 해 주 셨 으 면 좋 겠 습 니 다.

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