java - Android: Activity establish network connection -

i have activity looks data web in oncreate method. activity activated user hitting notification. common problem user turn on phone, unlock it, slide open notifications, tap notification, , activity activate before phone done connecting internet.

i have friendly alertdialog pops informing user data couldn't received , try again when network connected; is there way activity actively tell phone connect , detect connection being made , wait connection establish, , load data successfully?

usually, this:

@override public void onresume(){     super.onresume();     // first, check connectivity     if ( isonline ){         // things if there's network connection     }else{         // seems there's no internet connection         // ask user activate         new alertdialog.builder(youractivity.this)             .settitle("connection failed")             .setmessage("this application requires network access. please, enable " +                     "mobile network or wi-fi.")             .setpositivebutton("accept", new dialoginterface.onclicklistener() {                 @override                 public void onclick(dialoginterface dialog, int which) {                     // doing, jul                     youractivity.this.startactivity(new intent(settings.action_wireless_settings));                 }             })             .setnegativebutton("cancel", new dialoginterface.onclicklistener() {                 @override                 public void onclick(dialoginterface dialog, int which) {                     youractivity.this.finish();                 }             })             .show();     } } 

the idea ask user go , configure network connection. then, if user want configure it, call settings.action_wireless_settings intent.

also, notice isonline variable, boolean tells whether there's network connection or not. in order set variable can use external simple class this:

public class checkconnectivity {     public static boolean isonline(context context) {         connectivitymanager cm = (connectivitymanager) context.getsystemservice(context.connectivity_service);         if( cm == null )             return false;         networkinfo info = cm.getactivenetworkinfo();         if( info == null )             return false;         return info.isconnectedorconnecting();     } } 

also, have add permission androidmanifest.xml file:

<uses-permission android:name="android.permission.access_network_state" />