java – 具有ArrayList和ListView的Android Array Adapter在更改阵列列表时不会更新

我试图使用ArrayAdapter在列表中的屏幕上显示数组中的内容.

当我第一次加载SetupActivity类时,它可以工作,但是在addDevice()方法中有一个新的设备添加,这意味着更新保存设备的阵列.

我正在使用notifyDataSetChanged(),它应该更新列表,但似乎不起作用.

public class SetupActivity extends Activity
{   
    private ArrayList<Device> deviceList;

    private ArrayAdapter<Device> arrayAdapter;

    private ListView listView;

    private DevicesAdapter devicesAdapter;

    private Context context;

    public void onCreate(Bundle savedInstanceState)  //Method run when the activity is created
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.setup);  //Set the layout

        context = getApplicationContext();  //Get the screen

        listView = (ListView)findViewById(R.id.listView);

        deviceList = new ArrayList<Device>();

        deviceList = populateDeviceList();  //Get all the devices into the list

        arrayAdapter = new ArrayAdapter<Device>(this,android.R.layout.simple_list_item_1,deviceList);

        listView.setAdapter(arrayAdapter);  
    }

    protected void addDevice()  //Add device Method (Simplified)
    {
        deviceList = createNewDeviceList();    //Add device to the list and returns an updated list

        arrayAdapter.notifyDataSetChanged();    //Update the list
}
}

任何人都可以看到我出错的地方吗？