androidandroid-wifiwifimanager

How do I connect to a specific Wi-Fi network in Android programmatically?


I want to design an app which shows a list of Wi-Fi networks available and connect to whichever network is selected by the user.

I have implemented the part showing the scan results. Now I want to connect to a particular network selected by the user from the list of scan results.

How do I do this?


Solution

  • You need to create WifiConfiguration instance like this:

    String networkSSID = "test";
    String networkPass = "pass";
    
    WifiConfiguration conf = new WifiConfiguration();
    conf.SSID = "\"" + networkSSID + "\"";   // Please note the quotes. String should contain ssid in quotes
    

    Then, for WEP network you need to do this:

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

    For WPA network you need to add passphrase like this:

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

    For Open network you need to do this:

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

    Then, you need to add it to Android wifi manager settings:

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

    And finally, you might need to enable it, so Android connects to 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;
        }           
     }
    

    UPD: In case of WEP, if your password is in hex, you do not need to surround it with quotes.