Enable and disable WiFi

1. WiFi Nic status

There are five major statuses:

Wifi_state_disabled: WiFi Nic unavailable

Wifi_state_disabling: WiFi is being disabled

Wifi_state_enabled: WiFi Nic available

Wifi_state_enabled: the WiFi Nic is on.

Wifi_state_unknown: Unknown Nic status

2. WiFi is managed mainly through the wifimanager class. The procedure is as follows:

(1) first enable WiFi-related Permissions

 <  Uses-Permission  Android: Name  = "Android. Permission. access_network_state"  />  <  Uses-Permission Android: Name  = "Android. Permission. access_wifi_state"  />  <  Uses-Permission  Android: Name  = "Android. Permission. change_network_state"  />  <  Uses-Permission  Android: Name  = "Android. Permission. change_wifi_state"  /> 

(2) obtain the wifimanager object in the context object

Wifimanager = (wifimanager) getsystemservice (wifi_service );

(3) Enable, disable, and query the WiFi status through the change WiFi status method in the wifimanager class

Wifimanager. setwifienabled (true); // the WiFi status changes from wifi_state_enabled to wifi_state_enabled;

Wifimanager. setwifienabled (false); // The status of wifi disabling changes from wifi_state_disabling to wifi_state_disabled;

Wifimanager. getwifistate (); // query the WiFi status

3.Source codeAs follows:

(1) The androidmanifest. xml file is as follows:

 <?  XML version = "1.0" encoding = "UTF-8" ?>  <  Manifest  Xmlns: Android  = "Http://schemas.android.com/apk/res/android"  Package  = "Com. haitun. WiFi"  Android: versioncode  = "1"  Android: versionname  = "1.0"   >      <  Uses-SDK  Android: minsdkversion = "8"  Android: targetsdkversion  = "8"   />      <  Application  Android: allowbackup  = "True"  Android: icon  = "@ Drawable/ic_launcher"  Android: Label  = "@ String/app_name"  Android: Theme  = "@ Style/apptheme"   >         <  Activity  Android: Name  = "Com. haitun. Wifi. mainactivity"  Android: Label  = "@ String/app_name"   >              <  Intent-Filter  >                  <  Action  Android: Name  = "Android. Intent. Action. Main"   />                 <  Category  Android: Name  = "Android. Intent. Category. launcher"   />              </  Intent-Filter  >          </  Activity  >      </  Application  >      <  Uses-Permission Android: Name  = "Android. Permission. access_network_state"  />      <  Uses-Permission  Android: Name  = "Android. Permission. access_wifi_state"  />      <  Uses-Permission  Android: Name  = "Android. Permission. change_network_state"  />      <  Uses-Permission Android: Name  = "Android. Permission. change_wifi_state"  />  </  Manifest  > 

(2) JAVA SourceCode

 Package  Com. haitun. WiFi;  Import  Android.net. Wifi. wifimanager;  Import  Android. OS. Bundle;  Import  Android. App. activity; Import  Android. View. Menu;  Import  Android. View. menuitem;  Import  Android. widget. Toast;  Public   Class Mainactivity Extends  Activity {  Private   Final   Static   Int Start = 1 ; Private   Final   Static   Int Stop = 2 ;  Private   Final   Static   Int Check = 3 ;  Private Wifimanager = Null  ; @ Override  Protected   Void Oncreate (bundle savedinstancestate ){  Super  . Oncreate (savedinstancestate); setcontentview (R. layout. Main) ;}@ override  Public   Boolean  Oncreateoptionsmenu (menu ){  //  Inflate the menu; this adds items to the action bar if it is present.  //  Add menu button Menu. Add (0, start, 1, "enable WiFi" ); Menu. Add ( 0, stop, 2, "Disable WiFi"); Menu. Add ( 0, check, 3, "Check WiFi status" );  Return   True  ;} @ Override  Public   Boolean  Onoptionsitemselected (menuitem item ){  //  Todo auto-generated method stub  //  Enable WiFi          If (Item. getitemid () = Start) {wifimanager = (Wifimanager) getsystemservice (wifi_service); wifimanager. setwifienabled (  True  ); Toast. maketext (  This , "The current wireless network adapter status is:" + wifimanager. getwifistate () + "~ " , Toast. length_short). Show ();}  //  Disable WiFi          Else   If (Item. getitemid () = Stop) {wifimanager = (Wifimanager) getsystemservice (wifi_service); wifimanager. setwifienabled ( False  ); Toast. maketext (  This , "The current wireless network adapter status is:" + wifimanager. getwifistate () + "~ " , Toast. length_short). Show ();}  //  Query WiFi          Else   If (Item. getitemid () = Check ){  Int  State; State = Wifimanager. getwifistate (); toast. maketext (  This , "The current wireless Nic status is:" + state + "~ " , Toast. length_short). Show ();}  Return   Super  . Onoptionsitemselected (item );}}