SimpleAdapter arraylist在每一行中显示相同的数据

Question

我有四个用于测试的蓝牙设备，用于获取蓝牙设备的名称和地址，分别称为deviceA，deviceB，deviceC和deviceD
我的程序可以通过mReceiver一对一地获得设备，但是SimpleAdapter数组列表行有问题。 当我扫描新设备时，所有行将更改为相同的名称和地址。 我在哪里找不到问题。 请帮忙，谢谢。

我的问题例如：

首先扫描deviceA时，结果为

设备A地址A

secound扫描deviceB时，结果为

设备B地址B

设备B地址B

第三次扫描deviceC时，结果为deviceC AddressC

deviceC地址C

deviceC地址C

第四次再次扫描deviceB时，结果为

设备B地址B

设备B地址B

设备B地址B

设备B地址B

扫描deviceD时，结果为

deviceD地址D

deviceD地址D

deviceD地址D

deviceD地址D

deviceD地址D

这是我的代码：

private static BluetoothAdapter mBluetoothAdapter = null;
private static BluetoothSocket mBluetoothSocket = null;
private ListView listView;
private ArrayList<Map<String,Object>> list = null;
private SimpleAdapter adapter = null; 
private Map<String,Object> hashmap = new HashMap<String,Object>(); 

protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
            setContentView(R.layout.getbluetooth);
            listView = (ListView) findViewById(R.id.listView1); 
            list = new ArrayList<Map<String,Object>>(); 
            find_bluetooth();     
}

public void find_bluetooth()
{ 
        Set<BluetoothDevice> setPairedDevices = mBluetoothAdapter.getBondedDevices();

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

       adapter = new impleAdapter(Diver_getEvents.this,list,R.layout.bluetooth_list,new String[]{"devicename","deviceaddress"},new int[]{R.id.devicename,R.id.deviceaddress});

       listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
        @Override
     public void onItemClick(AdapterView<?> arg0, View v, int position,long  id) 
        {
                      mBluetoothAdapter.cancelDiscovery();
                    }
        }

   private final BroadcastReceiver mReceiver = new BroadcastReceiver()
         {
            public void onReceive(Context context, Intent intent) 
          {
               String action = intent.getAction();
                if (BluetoothDevice.ACTION_FOUND.equals(action)) 
              {
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
               String deviceBTName = device.getName();
    String deviceBaddress = device.getAddress();
    hashmap.put("devicename",deviceBTName);  
    hashmap.put("deviceaddress",deviceBaddress);  
    list.add(hashmap); 
               listView.setAdapter(adapter);
              }
         }
       }

}

Answer 1

您每次将其添加到列表时都必须创建一个新的HashMap

hashmap = new HashMap<String,Object>()
// put some values to hashmap
...
...
list.add(hashmap)