查找附近的蓝牙设备

先申报 BluetoothAdapter。

BluetoothAdapter mBluetoothAdapter;

现在为 ACTION_FOUND 创建一个 BroadcastReceiver

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();

    //Device found                
    if (BluetoothDevice.ACTION_FOUND.equals(action)) 
    {
        // Get the BluetoothDevice object from the Intent
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        // Add the name and address to an array adapter to show in a list
        mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
    }
  }
};

注册 BroadcastReceiver

IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);

然后通过调用 startDiscovery 开始发现附近的蓝牙设备

mBluetoothAdapter.startDiscovery(); 

别忘了取消注册 onDestroy 里面的 BroadcastReceiver

unregisterReceiver(mReceiver);