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();
}
}
}