You are registering in your constructor. I think you need to register in
onCreate. You appear to not have a context when your constructor is called.
On Wed, Oct 3, 2012 at 9:17 PM, Subodh Nijsure <subodh.nijs...@gmail.com>wrote:
> Hello Robert,
>
> Below is the stack trace that I see when system catches the exception:
>
> Not sure if you had any chance glancing at my sample code on original
> email, and see if anything obviously wrong there?
>
> I/System.out(12738): java.lang.NullPointerException
> I/System.out(12738): at
> android.content.ContextWrapper.registerReceiver(ContextWrapper.java:341)
> I/System.out(12738): at
> com.mycompany.ScsService.ScsService.<init>(ScsService.java:50)
> I/System.out(12738): at java.lang.Class.newInstanceImpl(Native Method)
> I/System.out(12738): at java.lang.Class.newInstance(Class.java:1319)
> I/System.out(12738): at
> android.app.ActivityThread.handleCreateService(ActivityThread.java:2234)
> I/System.out(12738): at
> android.app.ActivityThread.access$1600(ActivityThread.java:123)
> I/System.out(12738): at
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201)
> I/System.out(12738): at
> android.os.Handler.dispatchMessage(Handler.java:99)
> I/System.out(12738): at android.os.Looper.loop(Looper.java:137)
> I/System.out(12738): at
> android.app.ActivityThread.main(ActivityThread.java:4424)
> I/System.out(12738): at java.lang.reflect.Method.invokeNative(Native
> Method)
> I/System.out(12738): at java.lang.reflect.Method.invoke(Method.java:511)
> I/System.out(12738): at
>
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
> I/System.out(12738): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
> I/System.out(12738): at dalvik.system.NativeStart.main(Native Method)
>
> -Subodh
>
> On Wed, Oct 3, 2012 at 7:39 AM, Robert Greenwalt <rgreenw...@google.com>
> wrote:
> > Checking network types explicitly like this is bad - what happens if the
> > device is connected through a bluetooth tether or via ethernet adapter?
> >
> > You could use getActiveNetworkInfo() and check it's connection, but this
> is
> > still polling. If you need to get notified when a connection comes or
> goes
> > (have something to do on next connect, for example) The
> CONNECTIVITY_ACTION
> > broadcast intent is the way to go. Note that this can be chatty - there
> are
> > several secondary networks that currently cause this broadcast that you
> may
> > have to weed out. You should use getActiveNetworkInfo in your handler to
> > find the state that applies to you.
> >
> > Can you post the stack trace of the NPE?
> >
> > R
> >
> >
> > On Wed, Oct 3, 2012 at 5:46 AM, Rahul Kaushik <rahulkaushi...@gmail.com>
> > wrote:
> >>
> >> hi subodh
> >>
> >> try this
> >>
> >> package com.FranConnectMobile;
> >>
> >> import java.io.BufferedReader;
> >> import java.io.InputStreamReader;
> >> import java.net.URL;
> >> import android.app.Activity;
> >> import android.content.Context;
> >> import android.net.ConnectivityManager;
> >>
> >>
> >>
> >>
> >> public class chkInternet extends Activity
> >> {
> >> public boolean isInternetAvailable(Context context){
> >> ConnectivityManager connec = (ConnectivityManager)
> >> context.getSystemService(Context.CONNECTIVITY_SERVICE);
> >> android.net.NetworkInfo wifi =
> >> connec.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
> >> android.net.NetworkInfo mobile =
> >> connec.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
> >>
> >> if(wifi.isConnected() || mobile.isConnected()){
> >> // Check for web site
> >> try{
> >> // Create a URL for the desired page
> >> URL url = new URL("http://www.google.com";);
> >> // Read all the text returned by the server
> >> BufferedReader in = new BufferedReader(new
> >> InputStreamReader(url.openStream()));
> >> in.close();
> >> return true;
> >> } catch (Exception e) {
> >> return false;
> >> }
> >> }
> >>
> >> return false;
> >> }
> >>
> >> }
> >>
> >> TX
> >> RK
> >>
> >> On Wed, Oct 3, 2012 at 6:08 PM, Subodh Nijsure <
> subodh.nijs...@gmail.com>
> >> wrote:
> >>>
> >>> Hello,
> >>>
> >>> I am trying to implement a service that is supposed to download stuff
> >>> from a cloud service. So I want this service to be notified whenever
> >>> phone/tablet looses network connectivity.
> >>>
> >>>
> >>> So I implemented code that looks like this:
> >>>
> >>> receiver = new ConnectivityReceiver();
> >>> filter = new IntentFilter();
> >>>
> >>> filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
> >>> try {
> >>> Intent i = registerReceiver(receiver,
> >>> filter);
> >>> }
> >>> catch (Exception e) {
> >>> ....
> >>> }
> >>> However when I have this code in a class that extends a Service
> >>> registerReciver always throws a NullPointerException.
> >>>
> >>> However the same code in a class that extends an activity does not
> throw
> >>> such an exception. I have attached my manifest file and the full code
> for
> >>> the service template. Would appreciate any pointers as to why this
> works in
> >>> activity and not in a service.
> >>>
> >>> Or is there any better way for a service that run in the background to
> >>> know when device looses/gains (IP) network connectivity?
> >>>
> >>> Regards,
> >>> -Subodh
> >>>
> >>> --
> >>> You received this message because you are subscribed to the Google
> >>> Groups "Android Developers" group.
> >>> To post to this group, send email to
> android-developers@googlegroups.com
> >>> To unsubscribe from this group, send email to
> >>> android-developers+unsubscr...@googlegroups.com
> >>> For more options, visit this group at
> >>> http://groups.google.com/group/android-developers?hl=en
> >>
> >>
> >> --
> >> You received this message because you are subscribed to the Google
> >> Groups "Android Developers" group.
> >> To post to this group, send email to
> android-developers@googlegroups.com
> >> To unsubscribe from this group, send email to
> >> android-developers+unsubscr...@googlegroups.com
> >> For more options, visit this group at
> >> http://groups.google.com/group/android-developers?hl=en
> >
> >
> > --
> > You received this message because you are subscribed to the Google
> > Groups "Android Developers" group.
> > To post to this group, send email to android-developers@googlegroups.com
> > To unsubscribe from this group, send email to
> > android-developers+unsubscr...@googlegroups.com
> > For more options, visit this group at
> > http://groups.google.com/group/android-developers?hl=en
>
> --
> You received this message because you are subscribed to the Google
> Groups "Android Developers" group.
> To post to this group, send email to android-developers@googlegroups.com
> To unsubscribe from this group, send email to
> android-developers+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/android-developers?hl=en
>
--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
