写了一个可以扫描附近蓝牙设备的小Demo，可以查看蓝牙设备的设备名和Mac地址

代码量不多，很容易看懂

/** * 作者：叶应是叶 * 时间：2017/9/8 20:13 * 描述： */public class ScanDeviceActivity extends AppCompatActivity { private LoadingDialog loadingDialog; private DeviceAdapter deviceAdapter; private BluetoothAdapter bluetoothAdapter; private Handler handler = new Handler(); private BroadcastReceiver discoveryReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { switch (intent.getAction()) { case BluetoothAdapter.ACTION_DISCOVERY_STARTED: showLoadingDialog("正在搜索附近的蓝牙设备"); break; case BluetoothAdapter.ACTION_DISCOVERY_FINISHED: Toast.makeText(ScanDeviceActivity.this, "搜索结束", Toast.LENGTH_SHORT).show(); hideLoadingDialog(); break; case BluetoothDevice.ACTION_FOUND: BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); deviceAdapter.addDevice(bluetoothDevice); deviceAdapter.notifyDataSetChanged(); break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_scan_device); BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); bluetoothAdapter = bluetoothManager.getAdapter(); if (bluetoothAdapter == null) { Toast.makeText(this, "当前设备不支持蓝牙", Toast.LENGTH_SHORT).show(); finish(); } initView(); registerDiscoveryReceiver(); startScan(); } @Override protected void onDestroy() { super.onDestroy(); handler.removeCallbacksAndMessages(null); unregisterReceiver(discoveryReceiver); if (bluetoothAdapter.isDiscovering()) { bluetoothAdapter.cancelDiscovery(); } } private void initView() { ListView lv_deviceList = (ListView) findViewById(R.id.lv_deviceList); deviceAdapter = new DeviceAdapter(this); lv_deviceList.setAdapter(deviceAdapter); } private void registerDiscoveryReceiver() { IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); intentFilter.addAction(BluetoothDevice.ACTION_FOUND); intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED); registerReceiver(discoveryReceiver, intentFilter); } private void startScan() { if (!bluetoothAdapter.isEnabled()) { if (bluetoothAdapter.enable()) { handler.postDelayed(new Runnable() { @Override public void run() { scanDevice(); } }, 1500); } else { Toast.makeText(this, "请求蓝牙权限被拒绝，请授权", Toast.LENGTH_SHORT).show(); } } else { scanDevice(); } } private void scanDevice() { if (bluetoothAdapter.isDiscovering()) { bluetoothAdapter.cancelDiscovery(); } bluetoothAdapter.startDiscovery(); } private void showLoadingDialog(String message) { if (loadingDialog == null) { loadingDialog = new LoadingDialog(this); } loadingDialog.show(message, true, false); } private void hideLoadingDialog() { if (loadingDialog != null) { loadingDialog.dismiss(); } }}

此外，还可以通过利用反射来调用系统API，从而与支持蓝牙A2DP协议的蓝牙音响连接上，不过因为我只有一部不算严格意义上的蓝牙音响来做测试，所以这个功能并不确定是否适用于大多数蓝牙设备

/** * 作者：叶应是叶 * 时间：2017/9/8 20:02 * 描述： */public class ConnectA2dpActivity extends AppCompatActivity { private DeviceAdapter deviceAdapter; private BluetoothAdapter bluetoothAdapter; private Handler handler = new Handler(); private BluetoothA2dp bluetoothA2dp; private LoadingDialog loadingDialog; private final String TAG = "ConnectA2dpActivity"; private BroadcastReceiver a2dpReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { switch (intent.getAction()) { case BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED: int connectState = intent.getIntExtra(BluetoothA2dp.EXTRA_STATE, BluetoothA2dp.STATE_DISCONNECTED); if (connectState == BluetoothA2dp.STATE_DISCONNECTED) { Toast.makeText(ConnectA2dpActivity.this, "已断开连接", Toast.LENGTH_SHORT).show(); } else if (connectState == BluetoothA2dp.STATE_CONNECTED) { Toast.makeText(ConnectA2dpActivity.this, "已连接", Toast.LENGTH_SHORT).show(); } break; case BluetoothA2dp.ACTION_PLAYING_STATE_CHANGED: int playState = intent.getIntExtra(BluetoothA2dp.EXTRA_STATE, BluetoothA2dp.STATE_NOT_PLAYING); if (playState == BluetoothA2dp.STATE_PLAYING) { Toast.makeText(ConnectA2dpActivity.this, "处于播放状态", Toast.LENGTH_SHORT).show(); } else if (playState == BluetoothA2dp.STATE_NOT_PLAYING) { Toast.makeText(ConnectA2dpActivity.this, "未在播放", Toast.LENGTH_SHORT).show(); } break; } } }; private BroadcastReceiver discoveryReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { switch (intent.getAction()) { case BluetoothAdapter.ACTION_DISCOVERY_STARTED: showLoadingDialog("正在搜索蓝牙设备，搜索时间大约一分钟"); break; case BluetoothAdapter.ACTION_DISCOVERY_FINISHED: Toast.makeText(ConnectA2dpActivity.this, "搜索蓝牙设备结束", Toast.LENGTH_SHORT).show(); hideLoadingDialog(); break; case BluetoothDevice.ACTION_FOUND: BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); deviceAdapter.addDevice(bluetoothDevice); deviceAdapter.notifyDataSetChanged(); break; case BluetoothDevice.ACTION_BOND_STATE_CHANGED: int status = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.BOND_NONE); if (status == BluetoothDevice.BOND_BONDED) { Toast.makeText(ConnectA2dpActivity.this, "已连接", Toast.LENGTH_SHORT).show(); } else if (status == BluetoothDevice.BOND_NONE) { Toast.makeText(ConnectA2dpActivity.this, "未连接", Toast.LENGTH_SHORT).show(); } hideLoadingDialog(); break; } } }; private BluetoothProfile.ServiceListener profileServiceListener = new BluetoothProfile.ServiceListener() { @Override public void onServiceDisconnected(int profile) { if (profile == BluetoothProfile.A2DP) { Toast.makeText(ConnectA2dpActivity.this, "onServiceDisconnected", Toast.LENGTH_SHORT).show(); bluetoothA2dp = null; } } @Override public void onServiceConnected(int profile, final BluetoothProfile proxy) { if (profile == BluetoothProfile.A2DP) { Toast.makeText(ConnectA2dpActivity.this, "onServiceConnected", Toast.LENGTH_SHORT).show(); bluetoothA2dp = (BluetoothA2dp) proxy; } } }; private AdapterView.OnItemClickListener itemClickListener = new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { BluetoothDevice device = deviceAdapter.getDevice(position); if (device.getBondState() == BluetoothDevice.BOND_BONDED) { Toast.makeText(ConnectA2dpActivity.this, "已连接该设备", Toast.LENGTH_SHORT).show(); return; } showLoadingDialog("正在连接"); connectA2dp(device); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_connect_a2dp); BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); bluetoothAdapter = bluetoothManager.getAdapter(); if (bluetoothAdapter == null || !getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) { Toast.makeText(ConnectA2dpActivity.this, "当前设备不支持蓝牙", Toast.LENGTH_SHORT).show(); finish(); } bluetoothAdapter.getProfileProxy(this, profileServiceListener, BluetoothProfile.A2DP); initView(); registerDiscoveryReceiver(); registerA2dpReceiver(); startScan(); } @Override protected void onDestroy() { super.onDestroy(); handler.removeCallbacksAndMessages(null); unregisterReceiver(a2dpReceiver); unregisterReceiver(discoveryReceiver); if (bluetoothAdapter.isDiscovering()) { bluetoothAdapter.cancelDiscovery(); } } private void initView() { ListView lv_deviceList = (ListView) findViewById(R.id.lv_deviceList); deviceAdapter = new DeviceAdapter(this); lv_deviceList.setAdapter(deviceAdapter); lv_deviceList.setOnItemClickListener(itemClickListener); } private void registerDiscoveryReceiver() { IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); intentFilter.addAction(BluetoothDevice.ACTION_FOUND); intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED); registerReceiver(discoveryReceiver, intentFilter); } private void registerA2dpReceiver() { IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED); intentFilter.addAction(BluetoothA2dp.ACTION_PLAYING_STATE_CHANGED); registerReceiver(a2dpReceiver, intentFilter); } private void startScan() { if (!bluetoothAdapter.isEnabled()) { if (bluetoothAdapter.enable()) { handler.postDelayed(new Runnable() { @Override public void run() { scanDevice(); } }, 1500); } else { Toast.makeText(ConnectA2dpActivity.this, "请求蓝牙权限被拒绝", Toast.LENGTH_SHORT).show(); } } else { scanDevice(); } } private void scanDevice() { if (bluetoothAdapter.isDiscovering()) { bluetoothAdapter.cancelDiscovery(); } bluetoothAdapter.startDiscovery(); } public void setPriority(BluetoothDevice device, int priority) { try { Method connectMethod = BluetoothA2dp.class.getMethod("setPriority", BluetoothDevice.class, int.class); connectMethod.invoke(bluetoothA2dp, device, priority); } catch (Exception e) { e.printStackTrace(); } } 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(); } } private void showLoadingDialog(String message) { if (loadingDialog == null) { loadingDialog = new LoadingDialog(this); } loadingDialog.show(message, true, false); } private void hideLoadingDialog() { if (loadingDialog != null) { loadingDialog.dismiss(); } }}

这里给出源代码供大家参考：BluetoothDemo

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。