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Unable to register CONNECTIVITY_ACTION in a service
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Subodh Nijsure  
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 More options Oct 3 2012, 8:38 am
From: Subodh Nijsure <subodh.nijs...@gmail.com>
Date: Wed, 3 Oct 2012 05:38:09 -0700 (PDT)
Local: Wed, Oct 3 2012 8:38 am
Subject: Unable to register CONNECTIVITY_ACTION in a service
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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

  AndroidManifest.xml
1K Download

  ScsService.java
5K Download

 
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Rahul Kaushik  
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 More options Oct 3 2012, 8:47 am
From: Rahul Kaushik <rahulkaushi...@gmail.com>
Date: Wed, 3 Oct 2012 18:16:01 +0530
Local: Wed, Oct 3 2012 8:46 am
Subject: Re: [android-developers] Unable to register CONNECTIVITY_ACTION in a service
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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:


 
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Robert Greenwalt  
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 More options Oct 3 2012, 10:43 am
From: Robert Greenwalt <rgreenw...@google.com>
Date: Wed, 3 Oct 2012 07:39:09 -0700
Local: Wed, Oct 3 2012 10:39 am
Subject: Re: [android-developers] Unable to register CONNECTIVITY_ACTION in a service
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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:


 
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Subodh Nijsure  
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 More options Oct 4 2012, 12:19 am
From: Subodh Nijsure <subodh.nijs...@gmail.com>
Date: Wed, 3 Oct 2012 21:17:24 -0700
Local: Thurs, Oct 4 2012 12:17 am
Subject: Re: [android-developers] Unable to register CONNECTIVITY_ACTION in a service
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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


 
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Robert Greenwalt  
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 More options Oct 4 2012, 8:29 pm
From: Robert Greenwalt <rgreenw...@google.com>
Date: Thu, 4 Oct 2012 17:26:48 -0700
Local: Thurs, Oct 4 2012 8:26 pm
Subject: Re: [android-developers] Unable to register CONNECTIVITY_ACTION in a service
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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:


 
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