在项目中经常用到蓝牙的应用，在这里特意写了一个demo。并且封装了代码，可以主动连接和被动连接一起使用，也可以分开使用。方便后面以后查询使用，也重新踩了部分坑。

项目地址：android实现蓝牙聊天功能

1、程序简单的界面

2、客户端，主动连接

package com.bluetooth.tool; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.UUID; //蓝牙连接管理类 public class BluetoothManage { private static final Object mLock = new Object(); //蓝牙类的具体实现核心成员 private BluetoothAdapter mBtAdapter = BluetoothAdapter.getDefaultAdapter(); //蓝牙类的具体数据核心成员 private BluetoothSocket mTransferSocket = null; //当前连接的蓝牙地址 String mstrName = "";//当前连接用到的IP地址 String mstrAddress = "";//当前连接用到的IP地址 //读线程 ReadThread mReadThread = null; //从数据核心成员拿到的输入输出 InputStream mInputStream = null; OutputStream mOutputStream = null; private static BluetoothManage manage = null; public static BluetoothManage getInstance(){ synchronized (BluetoothManage.class){ if(manage == null) manage = new BluetoothManage(); } return manage; } public boolean sendData(int nLength, byte[] data) { if (mOutputStream == null) return false; try { mOutputStream.write(data, 0, nLength); return true; } catch (IOException e) { e.printStackTrace(); } return false; } ConnectListener mConnectListener = null; public void regConnectListener(ConnectListener arg0) { mConnectListener = arg0; } TopDataIOListener mIOListener = null; public void regIOListener(TopDataIOListener arg0) { mIOListener = arg0; } public void unRegIOListener() { mIOListener = null; } public boolean setSelectedDevice(String strDevice) { String[] strings = strDevice.split("\\|"); if (strings.length == 2) { mstrName = strings[0]; mstrAddress = strings[1]; return true; } return false; } public String getSelectedDeviceName() { if (mstrAddress.length() == 0) { return null; } return String.format("%s|%s", mstrName, mstrAddress); } public void connect() { if (mstrAddress.length() == 0) return; final BluetoothDevice device = mBtAdapter.getRemoteDevice(mstrAddress); new Thread(new Runnable() { @Override public void run() { synchronized (mLock) { String strLogString = ""; try { try { mTransferSocket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); } catch (IOException e1) { mTransferSocket = null; } if (mTransferSocket == null) { if (null != mConnectListener) mConnectListener.OnConnectStatusCallBack(false); return; } long nStartMillTime = System.currentTimeMillis(); //连接 try { mTransferSocket.connect(); } catch (IOException e1) { try { mTransferSocket.close(); } catch (IOException e2) { e2.printStackTrace(); } //等待一定时间 mTransferSocket = null; try { long havePassTime = System.currentTimeMillis() - nStartMillTime; if (havePassTime < 6000) { Thread.sleep(7000 - havePassTime); } } catch (InterruptedException e) { e.printStackTrace(); } } //连接失败 if (mTransferSocket == null) { if (null != mConnectListener) mConnectListener.OnConnectStatusCallBack(false); return; } try { mInputStream = mTransferSocket.getInputStream(); mOutputStream = mTransferSocket.getOutputStream(); mReadThread = new ReadThread(); mReadThread.start(); if (null != mConnectListener) mConnectListener.OnConnectStatusCallBack(true); } catch (IOException e1) { //断开连接 try { if (mTransferSocket != null) mTransferSocket.close(); } catch (IOException e2) { e2.printStackTrace(); } mTransferSocket = null; e1.printStackTrace(); if (null != mConnectListener) mConnectListener.OnConnectStatusCallBack(false); } } catch (Exception e) { //总体异常 if (null != mConnectListener) mConnectListener.OnConnectStatusCallBack(false); } } }//run() }).start(); } //读取数据 class ReadThread extends Thread { public void run() { int nMaxBufLength = 1024; byte[] buffer = new byte[nMaxBufLength]; int byteRead = -1; synchronized (mLock) { while (!isInterrupted()) { try { if (mInputStream != null) { byteRead = mInputStream.read(buffer); if (byteRead > 0 && byteRead <= buffer.length) { if (mIOListener != null) mIOListener.OnIOCallBack(byteRead, buffer); } else { //连接已断开 if (mConnectListener != null) { mConnectListener.OnDisConnectCallBack(); } break; } } else { break; } } catch (IOException e) { //连接已断开 if (mConnectListener != null) { mConnectListener.OnDisConnectCallBack(); } break; } }//while(!isInterrupted()) }//synchronized (mLock) } } //断开蓝牙 public void disConnect() { mConnectListener = null; //结束读线程 if (mReadThread != null) { mReadThread.interrupt(); mReadThread = null; } //取消所有连接 if (mTransferSocket != null) { try { mTransferSocket.close(); if (mInputStream != null) mInputStream.close(); if (mOutputStream != null) mOutputStream.close(); mInputStream = null; mOutputStream = null; mTransferSocket = null; } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { } } } }

主动连接应该是比较简单的，一个类就能实现，包括数据的收发。

3、蓝牙服务端，接收蓝牙连接

/** * 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://.bluetooth.tool; import android.content.Context; import android.os.Handler; import android.os.Message; import android.util.Log; /** * 蓝牙服务，接收蓝牙连接 */ public class BluetoothChat { // Debugging private static final String TAG = "BluetoothChat"; private static final boolean D = true; 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"; private String mConnectedDeviceName = null; private static StringBuffer mOutStringBuffer; private static BluetoothChatService mChatService = null; private static Context mContext; private volatile static BluetoothChat mBluetoothChat = null; TopDataIOListener mIOListener = null; public static BluetoothChat GetInstance(Context context) { if (mBluetoothChat == null && mContext == null) { synchronized (BluetoothChat.class){ mBluetoothChat = new BluetoothChat(); mContext = context; } } return mBluetoothChat; } public void onStart() { if (mChatService == null) setupChat(); if (mChatService != null) { if (mChatService.getState() == BluetoothChatService.STATE_NONE) { mChatService.start(); } } } private void setupChat() { mChatService = new BluetoothChatService(mContext,mHandler); mOutStringBuffer = new StringBuffer(""); } public void onDestroy() { if (mChatService != null) mChatService.stop(); } public void sendMessage(String message) { if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) { Log.i("Show", ""); return; } if (message.length() > 0) { byte[] send = message.getBytes(); mChatService.write(send); mOutStringBuffer.setLength(0); } } private final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MESSAGE_STATE_CHANGE: if (D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1); switch (msg.arg1) { case BluetoothChatService.STATE_CONNECTED: break; case BluetoothChatService.STATE_CONNECTING: break; case BluetoothChatService.STATE_LISTEN: break; case BluetoothChatService.STATE_NONE: break; } break; case MESSAGE_WRITE: byte[] writeBuf = (byte[]) msg.obj; String writeMessage = new String(writeBuf); break; case MESSAGE_READ: byte[] readBuf = (byte[]) msg.obj; //收到的蓝牙数据，回传给界面显示 if (mIOListener != null) mIOListener.OnIOCallBack(readBuf.length, readBuf); break; case MESSAGE_DEVICE_NAME: mConnectedDeviceName = msg.getData().getString(DEVICE_NAME); Log.i(TAG, "MESSAGE_DEVICE_NAME " + mConnectedDeviceName); break; case MESSAGE_TOAST: break; } } }; public void regIOListener(TopDataIOListener arg0) { mIOListener = arg0; } }

还有一个蓝牙的广播。这里就不贴代码了。

4、权限

<uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <!-- 部分手机6.0以上 蓝牙startDiscovery方法需要加上这个权限 --> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

蓝牙服务接收广播注册

<receiver android:name=".tool.BluetoothReceiver"> <intent-filter android:priority="1000"> <action android:name="android.bluetooth.adapter.action.STATE_CHANGED"/> <action android:name="android.bluetooth.device.action.ACL_CONNECTED"/> <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED"/> <action android:name="android.bluetooth.device.action.BOND_STATE_CHANGED"/> </intent-filter> </receiver>

5、在上面注释看到了有个bug注释

就是部分手机6.0以上 蓝牙蓝牙startDiscovery方法需要加上这个权限android.permission.ACCESS_COARSE_LOCATION。不然启动搜索蓝牙无效。