내 주변의 와이파이 목록 가져오기

The Way to Scan Wifi List 

내 주변의 와이파이의 목록을 가져오는 법

1. WifiManager를 선언

wifiManager = (WifiManager) getContext().getSystemService(Context.WIFI_SERVICE);

2. IntentFilter를 선언하여 Receiver를 등록

IntentFilter intentFilter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
getContext().registerReceiver(receiver, intentFilter);

3. Receiver의 구성

private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if(action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
            scanDatas = wifiManager.getScanResults();
            adapter.setResults(scanDatas);
        }else if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
            getContext().sendBroadcast(new Intent("wifi.ON_NETWORK_STATE_CHANGED"));
        }
    }
};

4. 스캔시작

wifiManager.startScan();

5. class의 종료시 receiver해제

getContext().unregisterReceiver(receiver);

추가적으로 자동으로 와이파이에 연결시키려면?

if(!wifiManager.isWifiEnabled()){
    wifiManager.setWifiEnabled(true);
}

전체적인 구성도 

public class WifiScanFragment extends Fragment {

    @Bind(R.id.widget_recyclerview) RecyclerView recyclerView;

    private WifiScanAdapter adapter;
    private WifiManager wifiManager;
    private List<ScanResult> scanDatas; // ScanResult List

    private BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if(action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
                scanDatas = wifiManager.getScanResults();
                adapter.setResults(scanDatas);
            }else if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
                getContext().sendBroadcast(new Intent("wifi.ON_NETWORK_STATE_CHANGED"));
            }
        }
    };

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        wifiManager = (WifiManager) getContext().getSystemService(Context.WIFI_SERVICE);
        if(!wifiManager.isWifiEnabled()){
            wifiManager.setWifiEnabled(true);
        }
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_wifi_scan, container, false);
        ButterKnife.bind(this, view);

        adapter = new WifiScanAdapter(getActivity());
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(adapter);
        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
        IntentFilter intentFilter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
        intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        getContext().registerReceiver(receiver, intentFilter);
        wifiManager.startScan();
    }

    @Override
    public void onPause() {
        super.onPause();
        getContext().unregisterReceiver(receiver);
    }
}

마지막으로 rxjava를 이용한 라이브러리도 있다.

https://github.com/pwittchen/ReactiveNetwork