Android Question playstore : error pre-launch report - java.lang.NullPointerException: Attempt to read from field 'anywheresoftware.b4a.BA fr.lyzo.main.activityBA'

voxel

Member
Licensed User
Hello,
I just put my app (with android 14) on the store in closed test and I have this pre-launch report. My app works well on different phones, it's strange. Could this be a "false" error from the store?

B4X: 
Exception java.lang.NullPointerException: Attempt to read from field 'anywheresoftware.b4a.BA fr.lyzo.main.activityBA' on a null object reference
  at fr.lyzo.main$ResumableSub_Activity_Create.resume (main.java:1066)
  at anywheresoftware.b4a.BA.checkAndRunWaitForEvent (BA.java:275)
  at anywheresoftware.b4a.BA.raiseEvent2 (BA.java:215)
  at anywheresoftware.b4a.keywords.Common$12.run (Common.java:1212)
  at android.os.Handler.handleCallback (Handler.java:938)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at android.os.Looper.loopOnce (Looper.java:201)
  at android.os.Looper.loop (Looper.java:288)
  at android.app.ActivityThread.main (ActivityThread.java:7870)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:548)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1003)

Thank for you help
 
Sort by date Sort by votes

walterf25

Expert
Licensed User
Longtime User
Looks like something was not Initialized maybe?

Does that report tell you if it's only a specific device this is happening? we need more context.
 
Upvote 0

voxel

Member
Licensed User
Hello,
The application crashes on 1 device only on the pre-launch report:
Model name: Small Desktop (x86) (virtual)
Android version: Android 12L (SDK 32)

Looking at the screenshots, I think the crash occurs during a file download (in progress) and maybe then the file save/unzip operations.
Hard to identify the cause of the problem with the trace.

A snippet of my code :

B4X: 
                telecharge.Initialize("",Me)
                telecharge.Download(urlbdd)
                MessageInit.Text="Veuillez patienter..."&CRLF&"Téléchargement des données"
                Wait For (telecharge) JobDone(telecharge As HttpJob)
                
                If telecharge.Success Then
                    MessageInit.Text="Installation des données"
                    Dim out As OutputStream = File.OpenOutput(File.DirInternal, "bdd.zip", False)
                    File.Copy2(telecharge.GetInputStream, out)
                    out.Close
                    MessageInit.Text="Vérification des données"
                    
                    Dim Var() As Byte = "pass".GetBytes("ISO-8859-1")
                    Arc.DecryptZipWithArray(Var, False)
                    Arc.UnZip(File.DirInternal & "/bdd.zip", File.DirInternal,"Archiver")
                    File.Delete(File.DirInternal,"bdd.zip")
                    
                    telecharge.Release
 
Upvote 0

voxel

Member
Licensed User
I just did a test by installing the same emulator (Small Desktop - Android12) in android studio and my app works fine. Strange.
 
Last edited:
Upvote 0

asales

Expert
Licensed User
Longtime User
This is an emulator using by Google in test.
I saw that the emulators and device using in this tests causes errors that not happens in another devices.
 
Upvote 0

agraham

Expert
Licensed User
Longtime User
Are you running that snippet in Activity_Create? If so then I would put it in Activity_Resume at the very least. Having that WaitFor in Activitity_Create will cause Activity_Resume to run immediately before returning to complete the rest of Activity_Create. This is not normally a 'good thing'.
 
Upvote 0

voxel

Member
Licensed User
Hello,
All my code is in Activity_Create. When launching my app, I download a file (splash screen waiting) and then the app can be used when the download is finished. I thought that the onResume executes when the onCreate code is finished?
Should I put most of my code in the onResume? The "NullPointerException" corresponds to this problem? Currently I don't have any code in the onResume
 
Last edited:
Upvote 0

agraham

Expert
Licensed User
Longtime User
voxel said:
I thought that the onResume executes when the onCreate code is finished?
Click to expand...
Not if you have a WaitFor in Activity_Create. B4A calls Activity_Create then Activity_Resume, one after the other. If you wait in Activity_Create then, as it always does, immediately exits that Sub and in this case then runs Activity_Resume. You need to analyse the actual sequence of code execution when you use WaitFor in a Sub.

voxel said:
Should I put most of my code in the onResume
Click to expand...
Not necessarily, but as I said you need to look at the actual code execution sequence in your particular app. I don't know if that is the problem here but it might contribute to it.
 
Upvote 0

voxel

Member
Licensed User
Hello, Thank you for your advice. By putting almost all the code in the onResume, the app works well (but I have not republished it on the store). The download when launching the app takes around 10 seconds (display of a splashscreen) then I display a layout. I will test several hypotheses.
 
Upvote 0
You must log in or register to reply here.

Similar Threads

G
  • Locked
  • Question
Android Question (SocketException) java.net.SocketException: Too many open files, error message
Replies
1
Views
1K
Erel
  • Question
Android Question sqlite do not save .. and error ....why?
Replies
15
Views
2K
LucaMs
  • Question
Android Question File not found error. [Solved]
Replies
6
Views
1K
Roger Daley
A
  • Question
Android Question NB6 Notification to take the user to the AppPage in PlayStore
Replies
4
Views
1K
Anser
A
  • Article
B4A Library AsyncTask
Replies
7
Views
8K
Informatix
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…