Android Question Error getting map key value

imgsimonebiliato · Jun 23, 2016

Hello,
I created a map and I populated it like this:

B4X:

map.Put("2016062309343853.jpg", "c:\desktop")

When I want to retrieve the key value, i do this

B4X:

Dim i as int
i = 0
map.GetKeyAt(i)

but I get this error log:

B4X:

java.lang.NumberFormatException: Invalid double: "2016062309343853.jpg"
    at java.lang.StringToReal.invalidReal(StringToReal.java:63)
    at java.lang.StringToReal.parseDouble(StringToReal.java:269)
    at java.lang.Double.parseDouble(Double.java:295)
    at it.android.imgspa.and_FotoContainer.svcupload._smb1_listcompleted(svcupload.java:409)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
    at anywheresoftware.b4a.BA$3.run(BA.java:320)
    at android.os.Handler.handleCallback(Handler.java:725)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:153)
    at android.app.ActivityThread.main(ActivityThread.java:5297)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
    at dalvik.system.NativeStart.main(Native Method)

I read that:

The key should be a string or a number. The value can be any type of object.

So what's wrong?

eurojam · Jun 23, 2016

I suppose your code is like this

B4X:

Dim i as int
i = 0
myVariable = map.GetKeyAt(i)

deppending on what Type is myvaraible - if it is a double type - you will get an error...?!

imgsimonebiliato · Jun 23, 2016

eurojam said:
I suppose your code is like this

B4X:

Dim i as int i = 0 myVariable = map.GetKeyAt(i)

deppending on what Type is myvaraible - if it is a double type - you will get an error...?!

My code it's like this:

B4X:

Dim k As String
Dim i as int
i = 0
k = map.GetKeyAt(i)

I need a string, not a double

udg · Jun 23, 2016

Your file name used for the key is evaluated as being a number, a double due to the "decimal" point, so the conversion from string to doubke fails for what is the file extension but it is read as the decimal part of your double.

imgsimonebiliato · Jun 23, 2016

udg said:
Your file name used for the key is evaluated as being a number, a double due to the "decimal" point, so the conversion from string to doubke fails for what is the file extension but it is read as the decimal part of your double.

I don't understand. How could be a double, if there is the word ".jpg"?

udg · Jun 23, 2016

I guess the problem arises because the filename part is an all-digits one so something looks at it like a number and having a full stop between filename and extension that makes it for a decimal number so the conversion routine from string to double which obviously fails.
Try without the full stop and it will work..just for testing.

imgsimonebiliato · Jun 23, 2016

udg said:
I guess the problem arises because the filename part is an all-digits one so something looks at it like a number and having a full stop between filename and extension that makes it for a decimal number so the conversion routine from string to double which obviously fails.
Try without the full stop and it will work..just for testing.

Without the full stop? What do you mean?

eurojam · Jun 23, 2016

I have tried this snipplet without any error....

B4X:

    Dim i As Int
    Dim map As Map
    map.Initialize
    map.Put("2016062309343853.jpg", "c:\desktop")
    i = 0
    Dim k As String = map.GetKeyAt(i)
    Log(k)

imgsimonebiliato · Jun 23, 2016

eurojam said:
I have tried this snipplet without any error....

B4X:

Dim i As Int Dim map As Map map.Initialize map.Put("2016062309343853.jpg", "c:\desktop") i = 0 Dim k As String = map.GetKeyAt(i) Log(k)

Neither me. But in another part of code, yes

Erel · Jun 23, 2016

udg said:
Your file name used for the key is evaluated as being a number, a double due to the "decimal" point, so the conversion from string to doubke fails for what is the file extension but it is read as the decimal part of your double.

This is not the reason for this error.

Please run your code in debug mode and post the line that raises the error.

Note that it is a mistake to use Map.GetKeyAt, but it is not related to this error.

udg · Jun 23, 2016

Reading post #9 it seems that the problematic programs sportse two code blocks supposed to be identical, where only one causes the error. If this is the case I'll try to figure out the difference between the two since @eurojams code works properly and the OP confirms it.

Android Question Error getting map key value

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