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Error Getting Time From TimePicker Dialog - "Attempt to invoke virtual method...on a null object..."  RSS feed

 
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Howdy, y'all!

Please forgive my incompetence but I seem to be having an issue properly getting hour and minutes from a TimePicker dialog. I am receiving the following error (which I know has a simple fix staring me in the face):

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.widget.TimePicker.getHour()' on a null object reference
                      at j5tech.co.offthehook.AddNewActivity$3.onClick(AddNewActivity.java:125)
                      at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:163)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:148)
                      at android.app.ActivityThread.main(ActivityThread.java:5417)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)



Error provided, let me also show you the code I am working with:



I have been staring at and tinkering with this issue for a few hours now to no avail, so I figured it is probably time to ask for help. Thanks!
 
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There's this line at the top of the stack trace:



It says the exception occurred in a method named "onClick", at line 125 of the source code.

So far you posted only 65 lines, not including an "onClick" method. It looks like you posted the whole method, but on the other hand what you posted isn't what's throwing the exception. You might want to look into what's up with that.
 
Adam Wentz
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Paul Clapham wrote:There's this line at the top of the stack trace:



It says the exception occurred in a method named "onClick", at line 125 of the source code.

So far you posted only 65 lines, not including an "onClick" method. It looks like you posted the whole method, but on the other hand what you posted isn't what's throwing the exception. You might want to look into what's up with that.




Paul, thanks for replying!

I only shared relevant code (that related to the error). The "onClick" method the error is referring to is found starting at line 51 here. To be more precise, line 125 in the error message correlates with line 52 in the code I posted. If I can't figure this out in the next hour or so, I am going to scrap much of this code anyhow and tackle time picking another way- using Calendar.
 
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Check that "timePicker" is not null after line 14.
 
Adam Wentz
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Tim Moores wrote:Check that "timePicker" is not null after line 14.



Tim, using a simple if/else statement and a Toast, I was able to deduce that the timePicker IS, in fact, null.
I am a bit perplexed by that fact, though, because when it appears, it displays the current device time.

Why is it null?
 
Adam Wentz
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Alright, I got this issue squared away...

I was trying to work with an object (TimePicker) that's actually in a separate view.

I inflate the view here...



However, I was neglecting to appropriately refer to it while grabbing the TimePicker...



Hence, the null object reference...since it couldn't be found in the parent view. So, to fix it, I simply needed to tweak the line as such...



And voila!
 
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Thanks for posting the solution.
 
It is sorta covered in the JavaRanch Style Guide.
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