public class MainActivity extends Activity {	private ListView lv;	private BluetoothAdapter adapter;	private MyReciver myReciver;	private ArrayList<String> list;	private ArrayAdapter<String> adapters;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		lv = (ListView) findViewById(R.id.lv);				//2、得到适配器				adapter = BluetoothAdapter.getDefaultAdapter();		list = new ArrayList<String>();		adapters = new ArrayAdapter<String>(				this,				android.R.layout.simple_list_item_1,				android.R.id.text1,				list);		lv.setAdapter(adapters);			}		public void da(View view){		//3、打开蓝牙-----两种方式：调用系统方式2、强行打开		if(!adapter.isEnabled()){//判断是否打开			Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);//请求被发现			startActivityForResult(intent, 100);//打开会返回资源		}//		if(!adapter.isEnabled()){//			adapter.enable();//强行打开//		}		//4、设置可见		Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);//设置可见		intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);//秒		startActivity(intent);			}	@Override	protected void onActivityResult(int requestCode, int resultCode, Intent data) {		// TODO Auto-generated method stub		super.onActivityResult(requestCode, resultCode, data);		if(resultCode==Activity.RESULT_OK){			Toast.makeText(this, "已经打开", 0).show();		}else{			Toast.makeText(this, "失败", 0).show();		}	}		public void sao(View view){		list.clear();		//5、扫描蓝牙		IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);		myReciver = new MyReciver();		registerReceiver(myReciver, intentFilter);		//开始扫描		adapter.startDiscovery();	}		public void guan(View view){		if(adapter.isEnabled()){			adapter.disable();//关闭蓝牙		}	}	public void cha(View view){		//得到已经配对的		Set<BluetoothDevice> devices = adapter.getBondedDevices();		list.clear();		for (BluetoothDevice bluetoothDevice : devices) {			list.add(bluetoothDevice.getName()+"\n"+bluetoothDevice.getAddress());			adapters.notifyDataSetChanged();			}	}		class MyReciver extends BroadcastReceiver{		@Override		public void onReceive(Context context, Intent intent) {			// 当系统发现设备就发送一次广播，接收广播，得到该蓝牙设备			BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);			if(!list.contains(device.getName()+"\n"+device.getAddress())){				list.add(device.getName()+"\n"+device.getAddress());				adapters.notifyDataSetChanged();							}		}			}}

    <uses-permission android:name="android.permission.BLUETOOTH"/>    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>