Move-android-wi-fi tutorial[]

Http://www.tutorialspoint.com/android/android_wi_fi.htm

Android allows applications to access-view the the state of the wireless connections at very low level. Application can access almost all the information of a WiFi connection.

The information that an application can access includes connected network's link speed,ip address, n Egotiation State (negotiation status), other networks information. Applications can also scan, add, save, terminate and initiate Wi-Fi connections.

Android provides Wifimanager API to manage all aspects (aspect) of the WIFI connectivity. We can instantiate this class by calling Getsystemservice method. Its syntax is given below−

In order to scan a list of wireless networks, the also need to register your broadcastreceiver. It can be registered using Registerreceiver method with argument of your receiver class object. Its syntax is given below−

extends Broadcastreceiver {   publicvoid  onreceive (Context C, Intent Intent) {    New  New intentfilter (wifimanager.scan_results_available_action));  

The WiFi scan can be-start by calling the Startscan method of the Wifimanager class. This method returns a list of Scanresult objects. You can access any object by calling the Get method of list. Its syntax is given below−

list<scanresult> wifiscanlist == wifiscanlist.get (0). toString ();

In general, the network environment is not how to change, try to reduce the number of WiFi scanning, I wrote the program when I found that each scan of about 10 seconds to complete ...

In addition, some WiFi scan will be triggered when the mobile WiFi is disconnected.

Below is a modified WiFi riceiver that uses handler to propagate messages

 PackageCom.example.longer3d.wifi;ImportAndroid.content.BroadcastReceiver;ImportAndroid.content.Context;Importandroid.content.Intent;ImportAndroid.net.NetworkInfo;Importandroid.net.wifi.SupplicantState;ImportAndroid.net.wifi.WifiInfo;ImportAndroid.net.wifi.WifiManager;ImportAndroid.os.Handler;ImportAndroid.util.Log; Public classWifistatusreceiverextendsBroadcastreceiver {/*** WiFi connection is successful*/     Public Static Final intWifi_handler_connect_success = 0x101; /*** WiFi Connection failed*/     Public Static Final intWifi_handler_connect_faild = 0x102; /*** WiFi connection failed, password is wrong, but only occasionally catch =_=. */     Public Static Final intWifi_handler_connect_faild_auth = 0x103; PrivateHandler Handler;  Publicwifistatusreceiver (Handler Handler) { This. Handler =handler; } @Override Public voidOnReceive (Context context, Intent Intent) {String action=intent.getaction (); Switch(action) { Casewifimanager.supplicant_state_changed_action://            //View Source Supplicantstatetracker.java//Supplicantstate supl_state =( (supplicantstate) Intent.getparcelableextra (wifimanager.extra_new_state)); if(Supl_state = =supplicantstate.completed) {//Add callbackhandler.sendemptymessage (wifi_handler_connect_success); LOG.E ("Supplicantstate", "WiFi completed"); } Else if(Supl_state = =supplicantstate.disconnected) {handler.sendemptymessage (wifi_handler_connect_faild); LOG.E ("Supplicantstate", "WiFi Disconnected"); } Else{LOG.E ("Supplicantstate", String.valueof (supl_state)); LOG.E ("Supplicantstate", "WiFi Unknown"); }            if(Intent.hasextra (wifimanager.extra_supplicant_error)) {Handler.sendemptymessage (wifi_handler_connect_                Faild_auth); LOG.E ("Supplicantstate", "WiFi Authentication failed!" "); }             Break; //WiFi connection on or off//will be called faster, and many times, do not know why, first do not use         Casewifimanager.network_state_changed_action://LOG.E ("receiver", "Network status Change");Networkinfo info =Intent.getparcelableextra (Wifimanager.extra_network_info); if(Info.getstate (). Equals (NetworkInfo.State.DISCONNECTED)) {//handler.sendemptymessage (wifi_handler_connect_faild);LOG.E ("receiver", "WiFi network connection Disconnected"); } Else if(Info.getstate (). Equals (NetworkInfo.State.CONNECTED)) {//get the current WiFi nameWifimanager Wifimanager =(Wifimanager) Context.getsystemservice (Context.wifi_service); Wifiinfo Wifiinfo=Wifimanager.getconnectioninfo (); LOG.E ("Receiver", "Connect to Network" +Wifiinfo.getssid ()); //Add callback//handler.sendemptymessage (wifi_handler_connect_success);            }             Break; //WiFi Open or not         Casewifimanager.wifi_state_changed_action:intWifistate =Intent.getintextra (Wifimanager.extra_wifi_state, wifimanager.wifi_state_disabled); if(Wifistate = =wifimanager.wifi_state_disabled) {LOG.E ("Receiver", "system off WiFi"); } Else if(Wifistate = =wifimanager.wifi_state_enabled) {LOG.E ("Receiver", "System on WiFi"); }             Break; }    }}

Move-android-wi-fi tutorial[]