android 获取蓝牙已连接装置

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);				}

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