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：

Java代码  

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

 2,根据是否有连接获取已连接的设备：

Java代码  

1. int flag = -1;  
2.                 if (a2dp == BluetoothProfile.STATE_CONNECTED) {  
3.                     flag = a2dp;  
4.                 } else if (headset == BluetoothProfile.STATE_CONNECTED) {  
5.                     flag = headset;  
6.                 } else if (health == BluetoothProfile.STATE_CONNECTED) {  
7.                     flag = health;  
8.                 }  
9.   
10.                 if (flag != -1) {  
11.                     bluetoothAdapter.getProfileProxy(MainActivity.this, new ServiceListener() {  
12.   
13.                         @Override  
14.                         public void onServiceDisconnected(int profile) {  
15.                             // TODO Auto-generated method stub  
16.   
17.                         }  
18.   
19.                         @Override  
20.                         public void onServiceConnected(int profile, BluetoothProfile proxy) {  
21.                             // TODO Auto-generated method stub  
22.                             List<BluetoothDevice> mDevices = proxy.getConnectedDevices();  
23.                             if (mDevices != null && mDevices.size() > 0) {  
24.                                 for (BluetoothDevice device : mDevices) {  
25.                                     Log.i("W", "device name: " + device.getName());  
26.                                 }  
27.                             } else {  
28.                                 Log.i("W", "mDevices is null");  
29.                             }  
30.                         }  
31.                     }, flag);  
32.                 }