Java.lang.NullPointerException when starting a service in android

Question

0.00/5 (No votes)

See more:

hi all, I want to start a service from an activity. So I gave this in my activity onCreate method

Java

try
        {
        Intent gforce=new Intent(GPS2Activity.this,GforceService.class);
        gforce.putExtra("NUMBER", number);
        ct.startService(gforce);
        }

        catch (Exception e) {
           Toast.makeText(this, e.toString(), 2000).show();
       }

in my service class onStart() method I put

Java

@Override
	public void onStart(Intent intent, int startId) {
		
		phn=intent.getStringExtra("NUMBER");
		
		super.onStart(intent, startId);
	}

Then it gives Java.lang.NullPointerEsception. What is the reason for that and what can I do to solve this problem.

Thanks,

Posted 11-Jun-12 12:51pm

roshani dias

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sandeep Mewara · Answer 1 · 2012-06-11T20:44:00

Thrown when an application attempts to use null in a case where an object is required. These include:

Calling the instance method of a null object.

Accessing or modifying the field of a null object.

Taking the length of null as if it were an array.

Accessing or modifying the slots of null as if it were an array.

Throwing null as if it were a Throwable value.

Details here:
Class NullPointerException[^]
Java error java.lang.nullpointerexception[^]

DEBUG and look for the potential place and fix/handle it.

Niklas L · Answer 2 · 2012-06-11T22:16:00

Solution 2

You should always check the intent parameter for null. In the docs:

The Intent supplied to startService(Intent), as given. This may be null if the service is being restarted after its process has gone away, and it had previously returned anything except START_STICKY_COMPATIBILITY.

Furthermore, onStart() is deprecated. You should use onStartCommand() in your service.

Posted 11-Jun-12 22:16pm

Niklas L

Comments

Espen Harlinn 12-Jun-12 8:17am

5'ed!

Niklas L 12-Jun-12 16:00pm

thank you