Android Question "Attempt to get length of null array" on Camera Picture Sizes

[Rob Bliss]

I haven't managed to replicate the error myself, however a user of mine has experienced it.

He's tried to load the camera, and then it crashed with: "java.lang.NullPointerException: Attempt to get length of null array" which was caused by the bottom line.

Sub Camera1_Ready (Success As Boolean)
    If Success Then
        '           For TROUBLESHOOTING, check the resolution supported
        Dim pictureSizes() As CameraSize = camEx.GetSupportedPicturesSizes
        Dim previewSizes() As CameraSize = camEx.GetSupportedPreviewSizes

        Dim LowResolution As Int = pictureSizes.Length - 1

To me, it seems as though the picture sizes came back null, in which case how and why had Success not been set as false?

On theory of mine, which I can't prove, or understand why it would happen, is in the GetSupportedPictureSizes function (see below) it failed the initial fetch and got caught by the try clause.

Public Sub GetSupportedPicturesSizes As CameraSize()
   Try
       r.target = parameters
       Dim list1 As List = r.RunMethod("getSupportedPictureSizes")
       Dim cs(list1.Size) As CameraSize
       For i = 0 To list1.Size - 1
           r.target = list1.get(i)
           cs(i).Width = r.GetField("width")
           cs(i).Height = r.GetField("height")
       Next
       Return cs
   Catch
       Log(LastException)
   End Try
End Sub

Has anyone seen this before, and/or think they might know what caused it??

Any help would be appreciated

 

[Erel]

The Try / Catch you added just make it more difficult to understand the error.

 

[Rob Bliss]

I think the function was crashing before it had chance to return the camera sizes, hence it would return null to the _ready function (solved that bit by returning an empty CameraSize object; it seems to hold together despite having to use 0x0 for preview and picture dimensions).

So if I'm right about that bit, I would like to know what might (theoretically) cause it to trigger the try/catch. It must've found a camera to use, else it wouldn't have gotten this far into the code and would've returned Success as False.

 

[Erel]

Hard to say. The camera can fail from time to time. Maybe it was used by a different process.