1：权限

<uses-feature
            android:name="android.hardware.bluetooth_le"
            android:required="true" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

2：打开蓝牙

bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

 if (bluetoothAdapter == null) {
      finish();
     } else if (!bluetoothAdapter.isEnabled()) {
            bluetoothAdapter.enable();
 }

　3：注册广播以及扫描

 // 开始扫描
bluetoothAdapter.startDiscovery();

      /*** 注册广播**/
     IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_FOUND);
     registerReceiver(broadcastReceiver,filter);
     IntentFilter filter2=new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(broadcastReceiver,filter2);



    private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                if (action == BluetoothDevice.ACTION_FOUND) {
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
                        String s = device.getName() + "*" + device.getAddress();
                        if(device.getAddress().equals(blueId)){
                            bluetoothDevice=device;
                            Log.d(TAG, "onReceive: --空2");
                        }
                            datas.add(device.getName() + "*" + device.getAddress());
                            Log.d(TAG, "onReceive: ---"+device.getName()+"---"+device.getAddress());

                    }else if(device.getBondState()!=BluetoothDevice.BOND_BONDED){
                        String s=device.getName()+"*"+device.getAddress();
                        Log.d(TAG, "onReceive: ---"+device.getName()+"---"+device.getAddress());
                        if(device.getAddress().equals(blueId)){
                            bluetoothDevice=device;
                            Log.d(TAG, "onReceive: --空1");
                        }
                        if(datas.indexOf(s)==-1){
                            datas.add(device.getName()+"*"+device.getAddress());
                        }
                    }
                }else if(action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){
                    Log.d(TAG, "onReceive: ---搜索完成");
                    Toast.makeText(MainActivity.this,"搜索完成!",Toast.LENGTH_SHORT).show();
                }
            }
        };

　　

4：配对

 /***传入的参数是 需要配对的bluetoothdevice */
   public void blePairing(BluetoothDevice bluetoothDevice){

           this.bluetoothDevice=bluetoothDevice;
           Method m = null;
           try {
               m = bluetoothDevice.getClass().getDeclaredMethod("createBond",new Class[]{});
               m.setAccessible(true);
               Boolean originalResult = null;
               try {
                   originalResult = (Boolean) m.invoke(bluetoothDevice);
                   boolean result = originalResult.booleanValue();
               } catch (IllegalAccessException e) {
                   e.printStackTrace();
               } catch (InvocationTargetException e) {
                   e.printStackTrace();
               }

           } catch (NoSuchMethodException e) {
               e.printStackTrace();
           }


       }

5：连接

连接  connectA2dp(bluetoothDevice);

 /**
     * 连接 音箱device
     * @param bluetoothDevice
     */
    private void connectA2dp(BluetoothDevice bluetoothDevice) {
        if (bluetoothA2dp == null || bluetoothDevice == null) {
            return;
        }

        setPriority(bluetoothDevice, 100);
        try {
            Method connectMethod = BluetoothA2dp.class.getMethod("connect", BluetoothDevice.class);
            connectMethod.invoke(bluetoothA2dp, bluetoothDevice);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

6： 连接需要的BluetoothA2dp对象需要通过监听得到

   /***
         * blueA2dp 监听
         */
        private BluetoothProfile.ServiceListener mListener = new BluetoothProfile.ServiceListener() {
            @Override
            public void onServiceDisconnected(int profile) {
                if(profile == BluetoothProfile.A2DP){
                    bluetoothA2dp = null;
                }
            }
            @Override
            public void onServiceConnected(int profile, BluetoothProfile proxy) {
                if(profile == BluetoothProfile.A2DP){
                    bluetoothA2dp = (BluetoothA2dp) proxy;
                }
            }
        };

7：code　

http://pan.baidu.com/s/1bBuYPS

　　

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本文链接：https://www.cnblogs.com/galibujianbusana/p/7840615.html