Android Question Type string array fails in MQTT subscribe

D

DickD

Active Member
Licensed User
I'm using MQTT. I created the type shown below that contains a string array. I load this array and publish it to MQTT successfully but when I subscribe to the message and try to use the serializator I get the error message shown below. Do I need convert the string to an object or vice versa?

error: java.lang.RuntimeException: java.lang.IllegalArgumentException: field dickddomain.com.Proximate.main$_profilestuff.Ques has type java.lang.String[][], got java.lang.Object[]

B4X: 
 Type ProfileStuff(Desc As String, Picture() As Byte, Ques(31,36) As String)
 Dim ProfileIn as ProfileStuff
.....
ProfileIn.initialize
....
Private Sub mqtt_MessageArrived (Topic As String, Payload() As Byte)
Dim obj as object
 obj = serializator.ConvertBytesToObject(Payload)
' error occurs here
 
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rboeck

Well-Known Member
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Longtime User
Hi, i use exactly the same last line, which produces the error, for more than two years - so i believe, the problem is, how you send the object.
We cant see, how you do this; maybe you should transfer your string array to an object (if possible) and send this object. Than the receive of an object should work too.
 
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DickD

Active Member
Licensed User
I've tried converting to an object. I get this error: java.lang.RuntimeException: java.lang.IllegalArgumentException: field dickddomain.com.Proximate.main$_profilestuff.Ques has type java.lang.Object[][], got java.lang.Object[].

Notice the difference in the number of brackets (dimensions) sent [][] vs. got []. After a lot of experimenting I think I understand now that Types are limited to a 1 dimensional array.

I'd like to know if anyone has gotten Types to work with multidimensional arrays.
 
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rboeck

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I think you want to transfer always one element of an two dimensional array; why you dont declare one variable only for this transfer as helper?
 
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DickD

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rboeck said:
I think you want to transfer always one element of an two dimensional array; why you dont declare one variable only for this transfer as helper?
Click to expand...
Yes. I made the 2D array into 1 simply be reducing one dimension to a string with separators. It works as a 1D array.
 
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DickD

Active Member
Licensed User
rboeck said:
I think you want to transfer always one element of an two dimensional array; why you dont declare one variable only for this transfer as helper?
Click to expand...
I spoke too soon. This still is not working. After a lot of research I finally discovered that arrays are not allowed in type variables. You can have arrays OF type variables not arrays IN type variables. It's as simple as that. I just wish that had been stated clearly in the documentation on this subject.
 
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