Code used to determine whether the network is connected in Android Development

In Android development, especially in development related to network access, you must determine whether the mobile phone is connected to the network. Is the following a clip that determines whether the mobile phone is connected to the network:

Package cn.com. Karl. util;

Import com. kubu. Main. R;

Import Android. App. activity;
Import Android. App. alertdialog;
Import Android. content. context;
Import Android. content. dialoginterface;
Import Android. content. intent;
Import android.net. connectivitymanager;
Import android.net. networkinfo;
Import Android. provider. settings;
Import Android. widget. textview;

Public class isinternet {

/**
* Determine network conditions
* @ Param context Context
* @ Return false indicates that no network exists. True indicates that a network exists.
*/
Public static Boolean isnetworkavalile (context ){
// Obtain the network status Manager
Connectivitymanager = (connectivitymanager) Context
. Getsystemservice (context. connectivity_service );

If (connectivitymanager = NULL ){
Return false;
} Else {
// Create a network Array
Networkinfo [] net_info = connectivitymanager. getallnetworkinfo ();

If (net_info! = NULL ){
For (INT I = 0; I <net_info.length; I ++ ){
// Determine whether the obtained network status is in the connection status
If (net_info [I]. getstate () = networkinfo. state. Connected ){
Return true;
}
}
}
}
Return false;
}

// If no network exists, the Network Settings dialog box is displayed.
Public static void checknetwork (final activity ){
If (! Isinternet. isnetworkavalible (activity )){
Textview MSG = new textview (activity );
MSG. settext ("No network is available currently. Set the network! ");
New alertdialog. Builder (activity)
. Seticon (R. drawable. Android)
. Settitle ("network status prompt ")
. Setview (MSG)
. Setpositivebutton ("OK ",
New dialoginterface. onclicklistener (){

Public void onclick (dialoginterface dialog,
Int whichbutton ){
// Jump to the settings page
Activity. startactivityforresult (new intent (
Settings. action_wireless_settings ),
0 );
}
}). Create (). Show ();
}
Return;
}
}