android 获取蓝牙已连接设备

蓝牙如果手动配对并已连接，获取连接的设备：

1.检测连接状态：

int a2dp = bluetoothAdapter.getProfileConnectionState(BluetoothProfile.A2DP);
				int headset = bluetoothAdapter.getProfileConnectionState(BluetoothProfile.HEADSET);
				int health = bluetoothAdapter.getProfileConnectionState(BluetoothProfile.HEALTH);

 2,根据是否有连接获取已连接的设备：

int flag = -1;
				if (a2dp == BluetoothProfile.STATE_CONNECTED) {
					flag = a2dp;
				} else if (headset == BluetoothProfile.STATE_CONNECTED) {
					flag = headset;
				} else if (health == BluetoothProfile.STATE_CONNECTED) {
					flag = health;
				}

				if (flag != -1) {
					bluetoothAdapter.getProfileProxy(MainActivity.this, new ServiceListener() {

						@Override
						public void onServiceDisconnected(int profile) {
							// TODO Auto-generated method stub

						}

						@Override
						public void onServiceConnected(int profile, BluetoothProfile proxy) {
							// TODO Auto-generated method stub
							List<BluetoothDevice> mDevices = proxy.getConnectedDevices();
							if (mDevices != null && mDevices.size() > 0) {
								for (BluetoothDevice device : mDevices) {
									Log.i("W", "device name: " + device.getName());
								}
							} else {
								Log.i("W", "mDevices is null");
							}
						}
					}, flag);
				}