How to search and connect to a specific wifi netwo

问题:

If this is the layout of the app, and when the wifi is turned on, I want the list of networks available and then to connect to it by selecting any of them

回答1:

Search for available wifi networks

    public class MainActivity extends Activity {


    WifiManager mainWifi;
    WifiReceiver receiverWifi;

    StringBuilder sb = new StringBuilder();


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


        mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        receiverWifi = new WifiReceiver();
        registerReceiver(receiverWifi, new IntentFilter(
                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
        if(mainWifi.isWifiEnabled()==false)
        {
            mainWifi.setWifiEnabled(true);
        }


        doInback();
    }

    public void doInback()
    {
        new Handler().postDelayed(new Runnable() {

            @Override
            public void run()
            {
                // TODO Auto-generated method stub
                mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

                receiverWifi = new WifiReceiver();
                registerReceiver(receiverWifi, new IntentFilter(
                        WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
                mainWifi.startScan();
                doInback();
            }
        }, 1000);

    }

    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add(0, 0, 0, "Refresh");
        return super.onCreateOptionsMenu(menu);}
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        mainWifi.startScan();

        return super.onMenuItemSelected(featureId, item);}


    @Override
    protected void onPause()
    {
        unregisterReceiver(receiverWifi);
        super.onPause();
    }

    @Override
    protected void onResume()
    {
        registerReceiver(receiverWifi, new IntentFilter(
                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
        super.onResume();
    }

    class WifiReceiver extends BroadcastReceiver
    {
        public void onReceive(Context c, Intent intent)
        {

            ArrayList<String> connections=new ArrayList<String>();
            ArrayList<Float> Signal_Strenth= new ArrayList<Float>();

            sb = new StringBuilder();
            List<ScanResult> wifiList;
            wifiList = mainWifi.getScanResults();
            for(int i = 0; i < wifiList.size(); i++)
            {

                connections.add(wifiList.get(i).SSID);
            }


        }
    }



}

create WifiConfiguration instance

 WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"" + networkSSID + "\"";

for WEP network

    conf.wepKeys[0] = "\"" + networkPass + "\""; 
conf.wepTxKeyIndex = 0;
conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
conf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40); 

For WPA network

conf.preSharedKey = "\""+ networkPass +"\"";

For Open network

conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);

add it to Android wifi manager

    WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE); 
wifiManager.addNetwork(conf);

enable it

    List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
for( WifiConfiguration i : list ) {
    if(i.SSID != null && i.SSID.equals("\"" + networkSSID + "\"")) {
         wifiManager.disconnect();
         wifiManager.enableNetwork(i.networkId, true);
         wifiManager.reconnect();               

         break;
    }           
 }

回答2:

From the first page get only third example for scanning available wifi it worked for me and I modify it to choose specific BSSID by using:

[bssid = wifiScanList.get(i).BSSID;
    if (desiredMacAddress.equals(bssid)){ APPEND TO SHOWING LIST...}
]

it tests it and it worked without problems+ gave what i wanted. from the second page get how to join desired access point it try it then it work with out any problems but I can't sure it gives me this functionality

Get WiFi's SSID without connecting to it?

one final thing if you tested second on a real device it will change its setting which will lead to problems