今天要做一个蓝牙4.0的通信，先做个小test,之后再看看具体的api:

 @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.scan:
               // bluetoothService.startBluetooth();
                //1,初始化蓝牙适配器
                final BluetoothManager bluetoothManager=(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
                BluetoothAdapter bluetoothAdapter= BluetoothAdapter.getDefaultAdapter();
                //2,开启蓝牙
                if(bluetoothAdapter==null || !bluetoothAdapter.isEnabled()){
                    Intent enableBtIntent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                    startActivityForResult(enableBtIntent,1);
                }
                //3,扫描附近的设备
                List<Map<String,String>> deviceList=new ArrayList<>();

                if(bluetoothAdapter.isDiscovering()){
                    bluetoothAdapter.cancelDiscovery();
                }else{
                    //每次扫描之前都先判断一下是否存在已久配对的设备
                    Set<BluetoothDevice> paireDevices=bluetoothAdapter.getBondedDevices();
                    if(paireDevices.size()>0){
                        for(BluetoothDevice device :paireDevices){
                            Map map=new HashMap();
                            map.put("deviceName",device.getName());
                            map.put("deviceAddress",device.getAddress());
                            deviceList.add(map);
                        }
                        Log.i("扫描到的已连接设备：",deviceList.toString());
                    }
                    bluetoothAdapter.startDiscovery();//开始搜索

                }
                bluetoothAdapter.cancelDiscovery();//停止扫描
                //4,通过Mac地址发送连接请求
                String myMac="";
                for(Map map : deviceList){
                    if(map.get("deviceName").toString().equals("iPhone-lhc")){
                        myMac=map.get("deviceAddress").toString();
                    }
                }
                BluetoothDevice device=bluetoothAdapter.getRemoteDevice(myMac);
                Log.i("我的Iphone手的地址为：",device.getAddress());
                //5,通过UUID使两个设备之间建立连接
                try{
                    BluetoothSocket socket=device.createInsecureRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));
                    socket.connect();//通过socket连接服务器，这是一个阻塞的过程，直到连接建立或者连接失败
                }catch(Exception exception){
                    Log.e("建立蓝牙连接失败：", exception.getMessage());
                }


                break;
        }
    }

未完待续。。