1.打开蓝牙：

      mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();/**如果本地蓝牙没有开启，则开启*/if (!mBluetoothAdapter.isEnabled()) {// 我们通过startActivityForResult()方法发起的Intent将会在onActivityResult()回调方法中获取用户的选择，比如用户单击了Yes开启，// 那么将会收到RESULT_OK的结果，// 如果RESULT_CANCELED则代表用户不愿意开启蓝牙Intent mIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);startActivityForResult(mIntent, ENABLE_BLUE);} else {Toast.makeText(this, "蓝牙已开启", Toast.LENGTH_SHORT).show();}

监听打开的结果：

    @Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == ENABLE_BLUE) {if (resultCode == RESULT_OK) {Toast.makeText(this, "蓝牙开启成功", Toast.LENGTH_SHORT).show();getBondedDevices();} else if (resultCode == RESULT_CANCELED) {Toast.makeText(this, "蓝牙开始失败", Toast.LENGTH_SHORT).show();}} else {}}

2.关闭蓝牙:

     /**关闭蓝牙*/if (mBluetoothAdapter.isEnabled()) {mBluetoothAdapter.disable();}

3.设计蓝牙为可见:

     Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 180);//180可见时间startActivity(intent);

4.收索蓝牙:

注册广播监听搜索的结果：

     /**注册搜索蓝牙receiver*/mFilter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);mFilter.addAction(BluetoothDevice.ACTION_FOUND);mFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);registerReceiver(mReceiver, mFilter);

开始的搜索：

     // 如果正在搜索，就先取消搜索if (mBluetoothAdapter.isDiscovering()) {mBluetoothAdapter.cancelDiscovery();}// 开始搜索蓝牙设备,搜索到的蓝牙设备通过广播返回mBluetoothAdapter.startDiscovery();

监听搜索的结果：

    private BroadcastReceiver mReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();/** 搜索到的蓝牙设备*/if (action.equals(BluetoothDevice.ACTION_FOUND)) {BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);// 搜索到的不是已经配对的蓝牙设备if (device.getBondState() != BluetoothDevice.BOND_BONDED) {BlueDevice blueDevice = new BlueDevice();blueDevice.setName(device.getName());blueDevice.setAddress(device.getAddress());blueDevice.setDevice(device);setDevices.add(blueDevice);blueAdapter.setSetDevices(setDevices);blueAdapter.notifyDataSetChanged();Log.d(MAINACTIVITY, "搜索结果......"+device.getName());}/**当绑定的状态改变时*/} else if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)) {/**搜索完成*/} else if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {setProgressBarIndeterminateVisibility(false);Log.d(MAINACTIVITY, "搜索完成......");hideProgressDailog();}}};

5.配对蓝牙:

配对工具类

    public class BlueUtils {public BlueUtils(BlueDevice blueDevice) {this.blueDevice = blueDevice;}/*** 配对*/public void doPair() {if(null == mOthHandler){HandlerThread handlerThread = new HandlerThread("other_thread");handlerThread.start();mOthHandler = new Handler(handlerThread.getLooper());}mOthHandler.post(new Runnable() {@Overridepublic void run() {initSocket();   //取得sockettry {socket.connect();   //请求配对//                      mAdapterManager.updateDeviceAdapter();} catch (IOException e) {e.printStackTrace();}}});}/*** 取消蓝牙配对* @param device*/public static void unpairDevice(BluetoothDevice device) {try {Method m = device.getClass().getMethod("removeBond", (Class[]) null);m.invoke(device, (Object[]) null);} catch (Exception e) {Log.d("BlueUtils", e.getMessage());}}/*** 取得BluetoothSocket*/private void initSocket() {BluetoothSocket temp = null;try {Method m = blueDevice.getDevice().getClass().getMethod("createRfcommSocket", new Class[] {int.class});temp = (BluetoothSocket) m.invoke(blueDevice.getDevice(), );//怪异错误： 直接赋值给socket,对socket操作可能出现异常，  要通过中间变量temp赋值给socket} catch (SecurityException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}socket = temp;}}

注册监听配对结果的广播（使用同上面的注册代码）

     /**注册搜索蓝牙receiver*/mFilter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);mFilter.addAction(BluetoothDevice.ACTION_FOUND);mFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);registerReceiver(mReceiver, mFilter);

开始配对

    /*** 开始配对蓝牙设备** @param blueDevice*/private void startPariBlue(BlueDevice blueDevice) {BlueUtils blueUtils = new BlueUtils(blueDevice);blueUtils.doPair();}

监听配对结果：（使用同上面的广播接收者）

    private BroadcastReceiver mReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();/** 搜索到的蓝牙设备*/if (action.equals(BluetoothDevice.ACTION_FOUND)) {...../**当绑定的状态改变时*/} else if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)) {BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);switch (device.getBondState()) {case BluetoothDevice.BOND_BONDING:Log.d(MAINACTIVITY, "正在配对......");break;case BluetoothDevice.BOND_BONDED:Log.d(MAINACTIVITY, "完成配对");hideProgressDailog();/**开始连接*/contectBuleDevices();break;case BluetoothDevice.BOND_NONE:Log.d(MAINACTIVITY, "取消配对");Toast.makeText(MainActivity.this,"成功取消配对",Toast.LENGTH_SHORT).show();getBondedDevices();break;default:break;}/**搜索完成*/} else if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {....}}};

6.使用A2DP协议连接蓝牙设备:

连接设备

    /*** 开始连接蓝牙设备*/private void contectBuleDevices() {/**使用A2DP协议连接设备*/mBluetoothAdapter.getProfileProxy(this, mProfileServiceListener, BluetoothProfile.A2DP);}

监听连接的回调

    /*** 连接蓝牙设备（通过监听蓝牙协议的服务，在连接服务的时候使用BluetoothA2dp协议）*/private BluetoothProfile.ServiceListener mProfileServiceListener = new BluetoothProfile.ServiceListener() {@Overridepublic void onServiceDisconnected(int profile) {}@Overridepublic void onServiceConnected(int profile, BluetoothProfile proxy) {try {if (profile == BluetoothProfile.HEADSET) {....} else if (profile == BluetoothProfile.A2DP) {/**使用A2DP的协议连接蓝牙设备（使用了反射技术调用连接的方法）*/a2dp = (BluetoothA2dp) proxy;if (a2dp.getConnectionState(currentBluetoothDevice) != BluetoothProfile.STATE_CONNECTED) {a2dp.getClass().getMethod("connect", BluetoothDevice.class).invoke(a2dp, currentBluetoothDevice);Toast.makeText(MainActivity.this,"请播放音乐",Toast.LENGTH_SHORT).show();getBondedDevices();}}} catch (Exception e) {e.printStackTrace();}}};

7.添加权限

    <uses-permission android:name="android.permission.BLUETOOTH" /><uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

8.打开乐库播放音乐

9.Android 6.0的系统需要动态添加权限才能搜索出蓝牙设备

Android 6.0的系统需要动态添加权限

    /**判断手机系统的版本*/if (Build.VERSION.SDK_INT >= 6.0) {//Build.VERSION.SDK_INT >= Build.VERSION_CODES.Mif(ActivityCompat.checkSelfPermission(this,Manifest.permission.ACCESS_COARSE_LOCATION)!=PackageManager.PERMISSION_GRANTED){/**动态添加权限：ACCESS_FINE_LOCATION*/ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},MY_PERMISSION_REQUEST_CONSTANT);}}

请求权限的回调

    /**请求权限的回调：这里判断权限是否添加成功*//**请求权限的回调：这里判断权限是否添加成功*/public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {switch (requestCode) {case MY_PERMISSION_REQUEST_CONSTANT: {if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {Log.i("main","添加权限成功");}return;}}}