蓝牙扫描 权限 BLUETOOTH，BLUETOOTH_ADMIN

Main里
//声明一个list集合,,,泛型是蓝牙设备
private List< BluetoothDevice> list = new ArrayList< >();
private MyReceiver myReceiver;
private ListViewAdapter adapter;

 //获取蓝牙适配器对象    bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();    //首先,如果要操作蓝牙,先判断当前的手机手否存在蓝牙    if (bluetoothAdapter != null){        //判断蓝牙是否可用        if (! bluetoothAdapter.isEnabled()){            //让蓝牙处于可用状态            bluetoothAdapter.enable();        }    }    myReceiver = new MyReceiver();    //动态注册一个广播接收者    IntentFilter filter = new IntentFilter();    //指定广播接收的那个动作...BluetoothDevice.ACTION_FOUND发现了一个蓝牙设备    filter.addAction(BluetoothDevice.ACTION_FOUND);    //再添加一个动作,,,配对状态改变的时候的动作    filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);    registerReceiver(myReceiver,filter);    //点击条目的时候跟当前未配对的设配进行配对    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {        @Override        public void onItemClick(AdapterView< ?> adapterView, View view, int i, long l) {            BluetoothDevice bluetoothDevice = list.get(i);            //没有配对的时候,去配对....使用反射去实现            if (BluetoothDevice.BOND_NONE == bluetoothDevice.getBondState()){                //首先通过MAC地址去获取要配对的设备                BluetoothDevice remoteDevice = bluetoothAdapter.getRemoteDevice(bluetoothDevice.getAddress());                //使用反射去配对                try {                    Method method = BluetoothDevice.class.getMethod("createBond", null);                    method.invoke(remoteDevice,null);                } catch (Exception e) {                    e.printStackTrace();                }            }        }    });}//搜索设备的点击事件public void searchDevice(View view){    //1.搜索配对过的设备    searchBoundDevice();    //2.扫描周边的蓝牙设备    searchUnboundDevice();    //3.设置适配器    setAdapter();}/** * 给listView设置适配器 */private void setAdapter() {    if (adapter == null){        adapter = new ListViewAdapter(MainActivity.this, list);        listView.setAdapter(adapter);    }else {        adapter.notifyDataSetChanged();    }}/** * 扫描没有配对的设备 */private void searchUnboundDevice() {    //如果现在蓝牙正在扫描    if (bluetoothAdapter.isDiscovering()){//directory目录,文件夹        bluetoothAdapter.cancelDiscovery();//结束当前正在执行的扫描    }    //开始本次的扫描    bluetoothAdapter.startDiscovery();//返回值是boolean类型,代表本次扫描是否已经开始    //开始扫描之后,,,,一旦扫描到设备之后,,,手机会发送广播,,,所以我们要获取发送过来有关蓝牙设备的信息,需要写一个广播接收者}/** * 该方法是:搜索已经配对的设备 */private void searchBoundDevice() {    //获取已经配对的设备,,,返回值是set集合,,泛型就是蓝牙设备    Set<BluetoothDevice> devices = bluetoothAdapter.getBondedDevices();    for (BluetoothDevice device: devices) {        //添加到list集合        if (! list.contains(device)){            list.add(device);        }    }}private class MyReceiver extends BroadcastReceiver{    @Override    public void onReceive(Context context, Intent intent) {        //获取传递过来的数据....实际上就是扫描到的蓝牙设备        BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);        //先获取一下当前广播接收的动作        String action = intent.getAction();        if (action.equals(bluetoothDevice.ACTION_FOUND)){//当前接收者接收的是扫描的广播发出来的信息            if (! list.contains(bluetoothDevice)){                list.add(bluetoothDevice);            }            //设置适配器            setAdapter();        }else if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)){            //首先获取到状态....对比状态            int bondState = bluetoothDevice.getBondState();            switch (bondState){                case BluetoothDevice.BOND_NONE:                    Toast.makeText(MainActivity.this,"配对失败",Toast.LENGTH_SHORT).show();                    break;                case BluetoothDevice.BOND_BONDING:                    Toast.makeText(MainActivity.this,"正在配对",Toast.LENGTH_SHORT).show();                    break;                case BluetoothDevice.BOND_BONDED:                    Toast.makeText(MainActivity.this,"配对成功",Toast.LENGTH_SHORT).show();                    list.remove(bluetoothDevice);                    list.add(0,bluetoothDevice);                    setAdapter();                    break;            }        }    }}@Overrideprotected void onDestroy() {    //在activity销毁的时候注销广播    if (myReceiver != null){        unregisterReceiver(myReceiver);        myReceiver = null;    }    super.onDestroy();    **//适配器类里** Context context;List< BluetoothDevice > list;public ListViewAdapter(Context context, List< BluetoothDevice > list) {    this.context = context;    this.list = list;}@Overridepublic int getCount() {    return list.size();}@Overridepublic Object getItem(int i) {    return list.get(i);}@Overridepublic long getItemId(int i) {    return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {    ViewHolder holder;    if (view == null){        view = View.inflate(context,R.layout.item_layout,null);        holder = new ViewHolder();        holder.text_name = view.findViewById(R.id.text_name);        holder.text_address = view.findViewById(R.id.text_address);        holder.text_state = view.findViewById(R.id.text_state);        view.setTag(holder);    }else {        holder = (ViewHolder) view.getTag();    }    BluetoothDevice bluetoothDevice = list.get(i);    holder.text_name.setText(bluetoothDevice.getName());    holder.text_address.setText(bluetoothDevice.getAddress());    //设置显示是否配对的状态    int bondState = bluetoothDevice.getBondState();    switch (bondState){        case BluetoothDevice.BOND_NONE:            holder.text_state.setText("未配对");            break;        case BluetoothDevice.BOND_BONDING:            holder.text_state.setText("正在配对");            break;        case BluetoothDevice.BOND_BONDED:            holder.text_state.setText("已经配对");            break;    }    return view;}//一个蓝牙设备主要的信息:设备的名称,,,设备的地址,,,是否配对一个状态private class ViewHolder{    TextView text_name;    TextView text_address;    TextView text_state;}