Android Question Null - problem

[gigi0ne]

I have a problem with a null,
when I check it is not detected.

Any ideas?

Below there is a capture screen.
Thank you

A

 

[drgottjr]

so NewsA looks like a map of some sort. and my guess would be that
NewsA.Link is a string, yes?

primitive data types can't be null. a string is one such data type,
although its value can be the null string (often seen as null - essentially "null" without
quotes, which is not the same thing as the null type).

null (the null type) isn't really a value. if you see null as a value, it is often a null (empty) string. you almost never
see "null" with the quotes, but rather simply null, which makes people think it's
null, which it isn't.

you might want to test NewsA. it could be null, and its properties affected
accordingly. or there simply could, in fact, be no NewsA.Link. if only
NewsA.Link is of interest, try testing for "" or "null".

if NewsA.Link is not a string, then i apologize for wasting your time.

 

[asales]

try with this:

Null not evaluating as Null

Upfront disclaimer: I've been working on my latest project pretty hard for the past few weeks, so I'm getting very tired... I have a sub that takes a String argument & returns a bitmap. I perform a test on the string to see if it's Null & if it isn't loads the file in the string, else it loads...

www.b4x.com

 

[agraham]

primitive data types can't be null. a string is one such data type,

To be pedantic strings are not actually primitive types but are reference types with value semantics and they can be null though B4X tries to avoid it. I know of two instances where this can happen. One is if a library returns a null value as a string parameter, I don't think B4X currently checks for this, and the other is a string item in an uninitialized custom type.

java.lang.NullPointerException

Hello, I have the same error several times in the analyze in Google Play. Unfortunately I can not reproduce and know where this error comes from. I have try on several and different devices, different version of Android, all works fine on my devices. to have an idea I have 106 times this same...

www.b4x.com

 

[gigi0ne]

so NewsA looks like a map of some sort. and my guess would be that
NewsA.Link is a string, yes?

primitive data types can't be null. a string is one such data type,
although its value can be the null string (often seen as null - essentially "null" without
quotes, which is not the same thing as the null type).

null (the null type) isn't really a value. if you see null as a value, it is often a null (empty) string. you almost never
see "null" with the quotes, but rather simply null, which makes people think it's
null, which it isn't.

you might want to test NewsA. it could be null, and its properties affected
accordingly. or there simply could, in fact, be no NewsA.Link. if only
NewsA.Link is of interest, try testing for "" or "null".

if NewsA.Link is not a string, then i apologize for wasting your time.

Thanks for the replies.

Fixed with drgottjr's solution