Check and remind the user to set up the network (2)

// 1 do not forget to add permissions // 2 main. XML is very simple. There is only one button. The // 3 mainactivity is omitted here: Package COM. test; import android. app. activity; import android. app. alertdialog; import android. content. componentname; import android. content. context; import android. content. dialoginterface; import android. content. intent; import android.net. connectivitymanager; import android. OS. bundle; import android. view. view; import android. widget. button; // <! -- Network permission --> // <uses-Permission Android: Name = "android. permission. access_network_state "/> // <uses-Permission Android: Name =" android. permission. internet "/> public class checenetactivity extends activity {private button; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); button = (button) findviewbyid (R. id. button); button. set Onclicklistener (new view. onclicklistener () {@ overridepublic void onclick (view v) {checknetwork (); // start checking the network});} public Boolean checknetwork () {Boolean flag = false; connectivitymanager = (connectivitymanager) This. getsystemservice (context. connectivity_service); If (Manager. getactivenetworkinfo ()! = NULL) {flag = manager. getactivenetworkinfo (). isavailable ();} If (! Flag) {alertdialog. builder = new alertdialog. builder (this); builder. seticon (Android. r. drawable. ic_dialog_alert); builder. settitle ("network status"); builder. setmessage ("the current network is unavailable. Are you sure you want to set it? "); Builder. setpositivebutton ("OK", new dialoginterface. onclicklistener () {@ overridepublic void onclick (dialoginterface dialog, int which) {componentname comp = new componentname ("com. android. settings "," com. android. settings. wirelesssettings "); intent mintent = new intent (); mintent. setcomponent (COMP); mintent. setaction ("android. intent. action. view "); startactivity (mintent) ;}}); builder. setnegativebutton ("cancel", new dialoginterface. onclicklistener () {@ override public void onclick (dialoginterface dialog, int which) {dialog. cancel () ;}}); builder. create (); builder. show () ;}return flag ;}}

 

Note: This judgment applies only to codes before 3.0. For the corrected code, see:

Http://blog.csdn.net/lfdfhl/article/details/8365396