Android Question another date picker. attempt to invoke method on null object

[le_toubib]

hi falks
i'm trying to implement another date picker in a project.
it works perfectly ok ,
however , on the FIRST run on any device , i get this error :

Installing file.
PackageAdded: package:dardiries.omnia.wisc
** Activity (main) Create, isFirst = true **
Object context is paused. Ignoring CallSubDelayed: AddToActivity
** Activity (main) Resume **
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.Canvas.drawColor(int, android.graphics.PorterDuff$Mode)' on a null object reference
at anywheresoftware.b4a.objects.drawable.CanvasWrapper.DrawColor(CanvasWrapper.java:131)
at dardiries.omnia.wisc.anotherdatepicker._drawdays(anotherdatepicker.java:510)
at dardiries.omnia.wisc.anotherdatepicker._show(anotherdatepicker.java:797)
at dardiries.omnia.wisc.main._dob_click(main.java:1570)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:187)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:77)
at android.view.View.performClick(View.java:4785)
at android.view.View$PerformClick.run(View.java:19858)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5696)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)

if i close it and rerun , it shows perfectly thereafter.. the error is replicated on Same device if i uninstall/reinstall


what am i doing wrong ?

 

[Erel]

Can you post the code in Activity_Create?

 

[le_toubib]

here it is

 

[Erel]

Have you tested it in Release mode? Did it happen as well?

 

[le_toubib]

Yes, and replicable on any device, only on first run

 

[Erel]

Not sure why it happens with this code. You can however remove ADP from the layout file and manually add it in Activity_Resume. It will fix this issue.

Make sure not to add it multiple times. Only add it if ADP.IsInitialized is false.

 

[le_toubib]

Aha, i thanks for this solution

 

[Mahares]

here it is

When you post code for users to help you with, you should leave it there even after you were provided a solution. It may help someone else in the future. You should not remove it, just because your problem is solved. if you expect help from others, you should also give help.

 

[le_toubib]

When you post code for users to help you with, you should leave it there even after you were provided a solution. It may help someone else in the future. You should not remove it, just because your problem is solved. if you expect help from others, you should also give help.

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    Activity.LoadLayout("1")
    SetTiledBackground(pnl_inputdata,LoadBitmap(File.DirAssets,"tile82x82.png"))
    SetTiledBackground(pnl_preview,LoadBitmap(File.DirAssets,"tile82x82.png"))
    SetTiledBackground(pnl_print,LoadBitmap(File.DirAssets,"tile82x82.png"))
    'SetTiledBackground(pnl_settings,LoadBitmap(File.DirAssets,"tile82x82.png"))

    If FirstTime Then
        SMTP.Initialize("smtp.gmail.com", 587, "", "", "SMTP")
        SMTP.StartTLSMode = True
    End If
    WebView1.Initialize("webview1")

    pnl_preview.AddView(WebView1,0,0,550dip,90%y)

    lst_prev_names.Initialize
    lst_places.Initialize
    lst_sources.Initialize

    readcomments
  

If File.Exists(File.DirRootExternal & dirname, "settings.ini") Then  
    readsettings
    readplaces
Else
    File.MakeDir(File.DirRootExternal,dirname)
    readsettings
    readplaces
End If

savesettings
    DateTime.DateFormat="dd-MM-yyyy"

    acet1.SetItems(lst_prev_names)
    acet2.SetItems(lst_places)
    createlabelsandspinners
  
    lbl_date.Text=lbl_date.Text & DateTime.Date(DateTime.Now)
    spn_test_type.Add("WISC")
    spn_test_type.Add("WAIS")
    spn_test_type.SelectedIndex=0

    'spn_test_type.Background=b_share.Background




End Sub

sure mate

 

[Erel]

I removed the SMTP account information from the code...

 

[le_toubib]

Thanks erel