我的Android應用程序多次檢測到相同的藍牙設備

Question

我使用Android開發人員網站的代碼來檢測範圍內的藍牙設備，並將它們添加到ArrayAdapter。問題是，每個設備被添加到ArrayAdapter 5-6次。現在，我只是使用的代碼從這裏：http://developer.android.com/guide/topics/connectivity/bluetooth.html#DiscoveringDevices

這是我有：

mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();  
mBluetoothAdapter.startDiscovery(); 

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

     // 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); 

      // Add the name and address to an array adapter to show in a ListView 
      mArrayAdapter.add(device.getName() + "\n" + device.getAddress()); 
     } 
    } 
}; 

任何想法是什麼引起的？我能做些什麼才能讓設備只添加一次到ArrayAdapter，而不是5次？

Answer 1

我不確定它是一個錯誤還是什麼，但我也在我的一些設備上體驗過這個。要解決這個問題，只需使用一次檢查在List中添加找到的設備。見下：

private List<BluetoothDevice> tmpBtChecker = new ArrayList<BluetoothDevice>(); 

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

      // When discovery starts  
      if(BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){ 
       //clearing any existing list data 
       tmpBtChecker.clear(); 
      } 

      // 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); 

       // Add the name and address to an array adapter 
       if(!tmpBtChecker.contains(device)){ 
        tmpBtChecker.add(device); 
        mArrayAdapter.add(device.getName()+"\n"+device.getAddress()); 
       } 
      } 
     } 
    };