问题描述： 在Android应用中使用Wifi扫描器，并将扫描到的结果显示在ListView中，但是ListView中没有显示任何结果。

解决方法：

1. 权限设置： 确保在AndroidManifest.xml文件中添加了以下权限：

2. ListView布局设置： 在布局文件中添加ListView组件：

3. Wifi扫描代码： 在Activity或Fragment中添加以下代码：

private WifiManager wifiManager;
private ListView wifiListView;
private ArrayAdapter adapter;
private List wifiList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
    wifiListView = findViewById(R.id.wifi_list);
    
    adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);
    wifiListView.setAdapter(adapter);
    
    wifiList = new ArrayList<>();
    scanWifi();
}

private void scanWifi() {
    if (!wifiManager.isWifiEnabled()) {
        wifiManager.setWifiEnabled(true);
    }
    
    registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
    wifiManager.startScan();
}

private BroadcastReceiver wifiReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        wifiList = wifiManager.getScanResults();
        
        for (ScanResult result : wifiList) {
            adapter.add(result.SSID);
        }
        
        unregisterReceiver(this);
    }
};

4. 动态权限请求： 在Activity或Fragment中添加以下代码，用于请求相关权限：

private static final int REQUEST_CODE_PERMISSION = 1;
private String[] permissions = {Manifest.permission.ACCESS_WIFI_STATE, Manifest.permission.ACCESS_FINE_LOCATION};

@Override
protected void onResume() {
    super.onResume();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        for (String permission : permissions) {
            if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(permissions, REQUEST_CODE_PERMISSION);
                return;
            }
        }
    }
    scanWifi();
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_CODE_PERMISSION) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            scanWifi();
        } else {
            Toast.makeText(this, "需要权限才能扫描Wifi", Toast.LENGTH_SHORT).show();
        }
    }
}

以上就是解决Android Wifi扫描器在ListView中不显示结果的方法，通过添加权限、设置ListView布局、编写Wifi扫描代码以及动态请求权限，可以实现在ListView中显示Wifi扫描结果。