如何使用蓝牙查找范围内的设备？

Question

我是 android 新手。我想开发一个应用程序，通过编程方式使用蓝牙来查找范围内的设备。如果有人有想法，请给我一些示例代码。

Answer 1

以编程方式使用蓝牙查找范围内的设备。

是的，您可以使用来执行此操作BroadcastReceiver，查看下面的代码，它会对您有所帮助。

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

查找设备

    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 ListView
       mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
    }
  }
};

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

Answer 2

创建类似于以下内容的广播接收器并添加设备信息

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
ArrayList<HashMap<String, String> arl = new ArrayList<HashMap<String, String>();    
            // When discovery finds a device
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                // Get the BluetoothDevice object from the Intent
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                // If it's already paired, skip it, because it's been listed already
                HashMap<String, String> deviceMap = new HashMap<String, String>();
                deviceMap.put(device.getName(), device.getAddress());
                arl.add(deviceMap);

            // When discovery is finished, change the Activity title
            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                setProgressBarIndeterminateVisibility(false);
                setTitle(R.string.select_device);
                if (mNewDevicesArrayAdapter.getCount() == 0) {
                    String noDevices = getResources().getText(R.string.none_found).toString();
                    mNewDevicesArrayAdapter.add(noDevices);
                }
            }
        }


    };

Answer 3

您可能想使用方法 startDiscovery() 。

我现在没有示例代码，但您可能想看看： http://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#startDiscovery%28%29

希望有帮助！