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

Question

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

User · Answer

The earlier answer works  but the solution can actually be simpler  Looping through the configured networks list is not required as you get the network id when you add the network through the WifiManager   So the complete  simplified solution would look something like this   WifiConfiguration wifiConfig   new WifiConfiguration    wifiConfig SSID   String format     s     ssid   wifiConfig preSharedKey   String format     s     key    WifiManager wifiManager    WifiManager getSystemService WIFI SERVICE     remember id int netId   wifiManager addNetwork wifiConfig   wifiManager disconnect    wifiManager enableNetwork netId  true   wifiManager reconnect

User · Answer

In API level 29  WifiManager enableNetwork   method is deprecated  As per Android API documentation check here          See WifiNetworkSpecifier Builder build   for new mechanism to trigger connection to a Wi-Fi network    See addNetworkSuggestions java util List   removeNetworkSuggestions java util List  for new API to add Wi-Fi   networks for consideration when auto-connecting to wifi  Compatibility   Note  For applications targeting Build VERSION CODES Q or above  this   API will always return false       From API level 29  to connect to WiFi network  you will need to use WifiNetworkSpecifier  You can find example code at https   developer android com reference android net wifi WifiNetworkSpecifier Builder html build

User · Answer

If your device knows the Wifi configs  already stored   we can bypass rocket science  Just loop through the configs an check if the SSID is matching  If so  connect and return   Set permissions    lt uses-permission android name  android permission ACCESS WIFI STATE    gt   lt uses-permission android name  android permission CHANGE WIFI STATE    gt    Connect       try       String ssid   null      if  wifi    Wifi PCAN WIRELESS GATEWAY            ssid   AesPrefs get AesConst PCAN WIRELESS SSID                  context getString R string pcan wireless ssid default          else if  wifi    Wifi KJ WIFI            ssid   context getString R string remote wifi ssid default              WifiManager wifiManager    WifiManager  context getApplicationContext                getSystemService Context WIFI SERVICE        List lt WifiConfiguration gt  wifiConfigurations   wifiManager getConfiguredNetworks         for  WifiConfiguration wifiConfiguration   wifiConfigurations            if  wifiConfiguration SSID equals        ssid                        wifiManager enableNetwork wifiConfiguration networkId  true               Log i TAG   connectToWifi  will enable     wifiConfiguration SSID               wifiManager reconnect                return null     return   sometimes logcat showed me network-entries twice                 which may will end in bugs                    catch  NullPointerException   IllegalStateException e        Log e TAG   connectToWifi  Missing network configuration       return null

User · Answer

Before connecting WIFI network you need to check security type of the WIFI network ScanResult class has a capabilities  This field gives you type of network   Refer  https   developer android com reference android net wifi ScanResult html capabilities  There are three types of WIFI networks   First  instantiate a WifiConfiguration object and fill in the network   s SSID  note that it has to be enclosed in double quotes   set the initial state to disabled  and specify the network   s priority  numbers around 40 seem to work well    WifiConfiguration wfc   new WifiConfiguration     wfc SSID        concat ssid  concat        wfc status   WifiConfiguration Status DISABLED  wfc priority   40    Now for the more complicated part  we need to fill several members of WifiConfiguration to specify the network   s security mode  For open networks   wfc allowedKeyManagement set WifiConfiguration KeyMgmt NONE   wfc allowedProtocols set WifiConfiguration Protocol RSN   wfc allowedProtocols set WifiConfiguration Protocol WPA   wfc allowedAuthAlgorithms clear    wfc allowedPairwiseCiphers set WifiConfiguration PairwiseCipher CCMP   wfc allowedPairwiseCiphers set WifiConfiguration PairwiseCipher TKIP   wfc allowedGroupCiphers set WifiConfiguration GroupCipher WEP40   wfc allowedGroupCiphers set WifiConfiguration GroupCipher WEP104   wfc allowedGroupCiphers set WifiConfiguration GroupCipher CCMP   wfc allowedGroupCiphers set WifiConfiguration GroupCipher TKIP     For networks using WEP  note that the WEP key is also enclosed in double quotes   wfc allowedKeyManagement set WifiConfiguration KeyMgmt NONE   wfc allowedProtocols set WifiConfiguration Protocol RSN   wfc allowedProtocols set WifiConfiguration Protocol WPA   wfc allowedAuthAlgorithms set WifiConfiguration AuthAlgorithm OPEN   wfc allowedAuthAlgorithms set WifiConfiguration AuthAlgorithm SHARED   wfc allowedPairwiseCiphers set WifiConfiguration PairwiseCipher CCMP   wfc allowedPairwiseCiphers set WifiConfiguration PairwiseCipher TKIP   wfc allowedGroupCiphers set WifiConfiguration GroupCipher WEP40   wfc allowedGroupCiphers set WifiConfiguration GroupCipher WEP104    if  isHexString password   wfc wepKeys 0    password  else wfc wepKeys 0         concat password  concat        wfc wepTxKeyIndex   0    For networks using WPA and WPA2  we can set the same values for either   wfc allowedProtocols set WifiConfiguration Protocol RSN   wfc allowedProtocols set WifiConfiguration Protocol WPA   wfc allowedKeyManagement set WifiConfiguration KeyMgmt WPA PSK   wfc allowedPairwiseCiphers set WifiConfiguration PairwiseCipher CCMP   wfc allowedPairwiseCiphers set WifiConfiguration PairwiseCipher TKIP   wfc allowedGroupCiphers set WifiConfiguration GroupCipher WEP40   wfc allowedGroupCiphers set WifiConfiguration GroupCipher WEP104   wfc allowedGroupCiphers set WifiConfiguration GroupCipher CCMP   wfc allowedGroupCiphers set WifiConfiguration GroupCipher TKIP    wfc preSharedKey        concat password  concat          Finally  we can add the network to the WifiManager   s known list  WifiManager wfMgr    WifiManager  context getSystemService Context WIFI SERVICE   int networkId   wfMgr addNetwork wfc   if  networkId    -1        success  can call wfMgr enableNetwork networkId  true  to connect

User · Answer

I also tried to connect to the network  None of the solutions proposed above works for hugerock t70   Function wifiManager disconnect    doesn t disconnect from current network   nd therefore cannot reconnect to the specified network  I have modified the above code  For me the code bolow works perfectly   String networkSSID    test   String networkPass    pass    WifiConfiguration conf   new WifiConfiguration    conf SSID          networkSSID            conf wepKeys 0           networkPass          conf wepTxKeyIndex   0  conf allowedKeyManagement set WifiConfiguration KeyMgmt NONE   conf allowedGroupCiphers set WifiConfiguration GroupCipher WEP40    conf preSharedKey         networkPass         WifiManager wifiManager             WifiManager context getSystemService Context WIFI SERVICE        int networkId   wifiManager addNetwork conf   wifi inf   wifiManager getConnectionInfo          important    wifiManager disableNetwork wifi inf getNetworkId                        wifiManager enableNetwork networkId  true

User · Answer

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 lt WifiConfiguration gt  list   wifiManager getConfiguredNetworks    for  WifiConfiguration i   list         if i SSID    null  amp  amp  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

User · Answer

Credit to  raji-ramamoorthi  amp   kenota  The solution which worked for me is combination of above contributors in this thread    To get ScanResult here is the process   WifiManager wifi    WifiManager  getSystemService Context WIFI SERVICE   if  wifi isWifiEnabled      false                Toast makeText getApplicationContext     wifi is disabled  making it enabled   Toast LENGTH LONG  show                wifi setWifiEnabled true              BroadcastReceiver broadcastReceiver   new BroadcastReceiver                  Override             public void onReceive Context c  Intent intent                     wifi getScanResults                               Notice to unregister it on onPause  amp  onStop live this unregisterReceiver broadcastReceiver    public void connectWiFi ScanResult scanResult            try                Log v  rht    Item clicked  SSID     scanResult SSID     Security       scanResult capabilities                String networkSSID   scanResult SSID              String networkPass    12345678                WifiConfiguration conf   new WifiConfiguration                conf SSID          networkSSID              Please note the quotes  String should contain ssid in quotes             conf status   WifiConfiguration Status ENABLED              conf priority   40               if  scanResult capabilities toUpperCase   contains  WEP                      Log v  rht    Configuring WEP                        conf allowedKeyManagement set WifiConfiguration KeyMgmt NONE                   conf allowedProtocols set WifiConfiguration Protocol RSN                   conf allowedProtocols set WifiConfiguration Protocol WPA                   conf allowedAuthAlgorithms set WifiConfiguration AuthAlgorithm OPEN                   conf allowedAuthAlgorithms set WifiConfiguration AuthAlgorithm SHARED                   conf allowedPairwiseCiphers set WifiConfiguration PairwiseCipher CCMP                   conf allowedPairwiseCiphers set WifiConfiguration PairwiseCipher TKIP                   conf allowedGroupCiphers set WifiConfiguration GroupCipher WEP40                   conf allowedGroupCiphers set WifiConfiguration GroupCipher WEP104                    if  networkPass matches    0-9a-fA-F                             conf wepKeys 0    networkPass                    else                       conf wepKeys 0         concat networkPass  concat                                           conf wepTxKeyIndex   0                 else if  scanResult capabilities toUpperCase   contains  WPA                      Log v  rht    Configuring WPA                     conf allowedProtocols set WifiConfiguration Protocol RSN                   conf allowedProtocols set WifiConfiguration Protocol WPA                   conf allowedKeyManagement set WifiConfiguration KeyMgmt WPA PSK                   conf allowedPairwiseCiphers set WifiConfiguration PairwiseCipher CCMP                   conf allowedPairwiseCiphers set WifiConfiguration PairwiseCipher TKIP                   conf allowedGroupCiphers set WifiConfiguration GroupCipher WEP40                   conf allowedGroupCiphers set WifiConfiguration GroupCipher WEP104                   conf allowedGroupCiphers set WifiConfiguration GroupCipher CCMP                   conf allowedGroupCiphers set WifiConfiguration GroupCipher TKIP                    conf preSharedKey          networkPass                        else                   Log v  rht    Configuring OPEN network                    conf allowedKeyManagement set WifiConfiguration KeyMgmt NONE                   conf allowedProtocols set WifiConfiguration Protocol RSN                   conf allowedProtocols set WifiConfiguration Protocol WPA                   conf allowedAuthAlgorithms clear                    conf allowedPairwiseCiphers set WifiConfiguration PairwiseCipher CCMP                   conf allowedPairwiseCiphers set WifiConfiguration PairwiseCipher TKIP                   conf allowedGroupCiphers set WifiConfiguration GroupCipher WEP40                   conf allowedGroupCiphers set WifiConfiguration GroupCipher WEP104                   conf allowedGroupCiphers set WifiConfiguration GroupCipher CCMP                   conf allowedGroupCiphers set WifiConfiguration GroupCipher TKIP                              WifiManager wifiManager    WifiManager  WiFiApplicationCore getAppContext   getSystemService Context WIFI SERVICE               int networkId   wifiManager addNetwork conf                Log v  rht    Add result     networkId                List lt WifiConfiguration gt  list   wifiManager getConfiguredNetworks                for  WifiConfiguration i   list                    if  i SSID    null  amp  amp  i SSID equals        networkSSID                                Log v  rht    WifiConfiguration SSID     i SSID                        boolean isDisconnected   wifiManager disconnect                        Log v  rht    isDisconnected       isDisconnected                        boolean isEnabled   wifiManager enableNetwork i networkId  true                       Log v  rht    isEnabled       isEnabled                        boolean isReconnected   wifiManager reconnect                        Log v  rht    isReconnected       isReconnected                        break                                             catch  Exception e                e printStackTrace

User · Answer

I broke my head to understand why your answers for WPA WPA2 don t work   after hours of tries I found what you are missing   conf allowedAuthAlgorithms set WifiConfiguration AuthAlgorithm OPEN     is REQUIRED for WPA networks      Now  it works

User · Answer

This is an activity you can subclass to force the connecting to a specific wifi  https   github com zoltanersek android-wifi-activity blob master app src main java com zoltanersek androidwifiactivity WifiActivity java  You will need to subclass this activity and implement its methods   public class SampleActivity extends WifiBaseActivity      Override   protected void onCreate Bundle savedInstanceState          super onCreate savedInstanceState           Override   protected int getSecondsTimeout           return 10          Override   protected String getWifiSSID           return  WifiNetwork           Override   protected String getWifiPass           return  123456

User · Answer

Try this method  It s very easy   public static boolean setSsidAndPassword Context context  String ssid  String ssidPassword        try           WifiManager wifiManager    WifiManager  context getSystemService context WIFI SERVICE           Method getConfigMethod   wifiManager getClass   getMethod  getWifiApConfiguration            WifiConfiguration wifiConfig    WifiConfiguration  getConfigMethod invoke wifiManager            wifiConfig SSID   ssid          wifiConfig preSharedKey   ssidPassword           Method setConfigMethod   wifiManager getClass   getMethod  setWifiApConfiguration   WifiConfiguration class           setConfigMethod invoke wifiManager  wifiConfig            return true        catch  Exception e            e printStackTrace            return false

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

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