Android Learning Note-wifi Network operation

WiFi NIC Status

1. Wifi_state_disabled WiFi NIC is not available

2. Wifi_state_diabling WiFi NIC is shutting down

3. Wifi_state_enabled WiFi NIC Available

4. Wifi_state_enabling WiFi Card is open

5. Wifi_state_unknown Unknown NIC Status

Permissions required to operate the WiFi network card

1. Change_network_state Changing network connection Status

2. Change_wifi_state changing the WiFi connection status

3. Access_network_state allow the app to get network status information

4. Access_wifi_state allow app to get WIFI status information

Interface Activity_main.xml

 <textview        android:id= "@+id/hello"          android:layout_width= "Wrap_content"          android:layout_height= "Wrap_content"         android:text= "@ String/hello_world " />        <button android:id=" @+id /startwifi "    android:layout_width=" Fill_parent "     android: layout_height= "Wrap_content"      android:layout_below= "@id/hello"      android:text= "Start your phone's WiFi card"     /><button android:id= "@+id/stopWifi"      android:layout_width= "Fill_parent"      android:layout_height= "Wrap_ Content "     android:layout_below=" @id/startwifi "    android:text = "Turn off your phone's WiFi card"   &Nbsp; /><button android:id= "@+id/checkwifi"     android:layout_width= "Fill_ Parent "     android:layout_height=" Wrap_content "     android : layout_below= "@id/stopwifi"     android:text= "Check current WiFi card status"     />

The permissions Required

<!--The following are the permissions required to access the network using WiFi--><uses-permission android:name= "Android.permission.CHANGE_NETWORK_STATE" > </uses-permission><uses-permission android:name= "Android.permission.CHANGE_WIFI_STATE" ></ Uses-permission><uses-permission android:name= "Android.permission.ACCESS_NETWORK_STATE" ></ Uses-permission><uses-permission android:name= "Android.permission.ACCESS_WIFI_STATE" ></ Uses-permission>

Mainactivity.java

Public class mainactivity extends activity {private button startbutton  = null;private button stopbutton = null;private button checkbutton  = null;private WifiManager wifiManager = null;     @Override     public void oncreate (bundle savedinstancestate)  {         super.oncreate (savedinstancestate);         setcontentview (r.layout.activity_main);         startbutton  =  (Button) Findviewbyid (R.id.startwifi);         stopbutton  =  (Button) Findviewbyid (R.id.stopwifi);         checkbutton  =  (Button) Findviewbyid (R.id.checkwifi);         Startbutton.setonclicklistener (new stArtwifilistener ());         stopbutton.setonclicklistener (new  Stopwifilistener ());         checkbutton.setonclicklistener (new  Checkwifilistener ());    }    class startwifilistener  implements onclicklistener{@Overridepublic  void onclick (view v)  {wifimanager =   (Wifimanager) MainActivity.this.getSystemService (Context.wifi_service); wifimanager.setwifienabled (true); System.out.println ("wifi state --->"  + wifimanager.getwifistate ()); Toast.maketext (mainactivity.this,  "Current WiFi card status is"  + wifimanager.getwifistate (),  Toast.LENGTH _short). Show ();}     }    class StopWifiListener implements  onclicklistener{@Overridepublic  void onclick (view arg0)  {// todo auto-generated  method stubwifimanager =&nBSP; (Wifimanager) MainActivity.this.getSystemService (Context.wifi_service); wifimanager.setwifienabled (false); System.out.println ("wifi state --->"  + wifimanager.getwifistate ());/* Getwifistate returns one of the following five constants the following five constants are predefined in the Wifimanager class Public static final int wifi_state_ Disabling = 0;    public static final int wifi_state_ Disabled = 1;    public static final int wifi_state_enabling  = 2;    public static final int wifi_state_enabled =  3;    public static final int WIFI_STATE_UNKNOWN = 4;  */toast.maketext (mainactivity.this,  "Current WiFi card status is"  + wifimanager.getwifistate (),  Toast.length_short). Show ();}     }        class CheckWifiListener  Implements onclicklistener{@Overridepublic  void onclick (view v)  {wifiManager =  (Wifimanager) MainActivity.this.getSystemService (Context.wifi_service); System.out.println ("wifi state --->"  + wifimanager.getwifistate ()); Toast.maketext (mainactivity.this,  "Current WiFi card status is"  + wifimanager.getwifistate (),  Toast.LENGTH _short). Show ();}         }}

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Android Learning Note-wifi Network operation