Android Question java.lang.NullPointerException

[Robert Valentino]

I keep seeing this message in a debug session and cannot figure out what is causing it.

Is there a easy way to determine where this happening?

Sometimes the debugger points me to this line:

	If FirstTime Then
	   mFirstTime = True
	   
	   mUsePinPosition = 0                       '<---------------- Points to this line
	   
       mGPS.Initialize("GPS")	

       mGPSCourseEntry = -1
	   mGPSCourseHole  = -1
	   
	   mGPSCourseList.Initialize
	   mGPSCourse.Initialize
	   
	   mGPSParser.Initialize
	End If

But that line is defined in my process_globals as

	Private mUsePinPosition                      As Int

Any Help

BobVal

 

[eps]

Is it definitely that line in the code? As you've got an 'If FirstTime' check which precedes it and this could be what is causing you an issue, if you use the variable later on but haven't assigned a value.. as it isn't the 'FirstTime'..

 

[Robert Valentino]

Yes, but there is always a FirstTime, I should have included the code above it.

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
	
    Activity.LoadLayout("sPlayerScoring")
	Activity.Title = "Player Scoring"

	If FirstTime Then

Also this is a Int so even if I do not assign it a value, it should not give me a Null Pointer.

But in any case just to be sure I did a

Private mUsePinPosition   as   Int  =  0

and am still have that Null Pointer. I believe it is somewhere else and just happens to be sometimes pointing there.

BobVal

 

[eps]

If you don't assign it a value it will be null. If you want it to always have a value you will need to assign it a value when it gets defined.

You always have a Firsttime, but if it isn't the first time it will be false.. and won't execute that code.

 

[nikolaus]

Yes, but there is always a FirstTime, I should have included the code above it.

But in any case just to be sure I did a

Private mUsePinPosition   as   Int  =  0

Doesn't this have to be

Private mUsePinPosition = 0 as Int

 

[Reviewnow]

Private mUsePinPosition as int : mUsePinPosition = 0

 

[nikolaus]

thats legal, as is mine, but I think the OP's version is not and the assignement is simply ignored

 

[Reviewnow]

Move your assignment to
Sub Process_Globals()

Then it can be accessed anywhere

 

[Robert Valentino]

Interesting questions about the assignments. If I cannot do my assignments that way then I have a lot of code to change because I do that all the time all over the place and to my knowledge have never had a problem.
Hopefull Erel will answer if

Private mSomeVariable as Int = 0

is proper.
I do a lot of

private mSomeVariable as Boolean = True

or

private mSomeVarialbe as Boolean = False

and always have had them set right

 

[Erel]

The code above is valid.

Can you post the full error message from the logs?

 

[Robert Valentino]

Well I figured out where this was happening:

 DBCursor.GetString(DEFINE_DB_FieldTags_ImportantDates)

In the database I am using someone allowed this field to be Null and I assign it to a string variable that did not test for Null (sure wish allowing a Null field in a DB meant an Empty string "" for string types) but this line was inside a Try / Catch
and the catch part

        Catch
                'Log(LastException.Message)
      End Try

was just eating up the Exception. Oh well that's what happens when you use OPC (Other peoples code). I guess I will have to look at all this code instead of just using it.

Thanks for the help guys.