안드로이드 , 와이파이스캔이 안됩니다.

갤럭시S3 에서는 되는데 갤럭시A8에서는 와이파이 검색이 안됩니다.

최신 폰에서 안되는 듯 합니다.

이유가 뭘까요?

//wifi Scan...
    private BroadcastReceiver ScanReceiver = new BroadcastReceiver() {
@Override
        public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
                getWIFIScanResult(); // get WIFISCanResult
                wifiManager.startScan(); // for refresh
            } else if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
                sendBroadcast(new Intent("wifi.ON_NETWORK_STATE_CHANGED"));
            }
        }
    };

public void getWIFIScanResult() {
        String[] spl;
        String str;

mScanResult = wifiManager.getScanResults(); // ScanResult
        showmsg(""+mScanResult+"개의 와이파이가 검색되었습니다.");
// Scan count
        for (int i = 0; i < mScanResult.size(); i++) {
            ScanResult result = mScanResult.get(i);
if(result.SSID.length()>4) {
list.add(result.SSID.toString() + ",\t\t 신호세기:" + result.level + " dBm");
                str = result.SSID.toString();
                spl = str.split("-");   //문자열 분리
                if (spl.length > 0) {

                }
            }
        }

adapter.notifyDataSetChanged(); //ListView 화면 갱신.
        SearchBtn.setText("검색완료");
        getApplicationContext().unregisterReceiver(ScanReceiver); // stop WIFISCan
        playSystemBeep();

    }

public void initWIFIScan() {
// init WIFISCAN
        final IntentFilter filter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
        filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        getApplicationContext().registerReceiver(ScanReceiver, filter);
wifiManager.startScan();
SearchBtn.setText("검색중..");
    }