Android Question LoadBitmapSample and java.lang.ArithmeticException - divide by zero

Filippo · Sep 26, 2023

Hi,

I have this error in Crashlytics dashboard:

Fatal Exception: java.lang.ArithmeticException: divide by zero
at anywheresoftware.b4a.objects.drawable.CanvasWrapper$BitmapWrapper.initializeSampleImpl(CanvasWrapper.java:606)
at anywheresoftware.b4a.objects.drawable.CanvasWrapper$BitmapWrapper.InitializeSample(CanvasWrapper.java:598)
at anywheresoftware.b4a.keywords.Common.LoadBitmapSample(Common.java:1389)
at fg.speedpilot_lite.main._vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv5(main.java:2340)
at fg.speedpilot_lite.main._vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv2(main.java:2310)
at fg.speedpilot_lite.main._activity_resume(main.java:860)
at java.lang.reflect.Method.invoke(Method.java)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:221)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:201)
at fg.speedpilot_lite.main.afterFirstLayout(main.java:111)
at fg.speedpilot_lite.main.access$000(main.java:17)
at fg.speedpilot_lite.main$WaitForLayout.run(main.java:83)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:226)
at android.os.Looper.loop(Looper.java:313)
at android.app.ActivityThread.main(ActivityThread.java:8751)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)

This line : vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv2(main.java:2310)
points to this procedure:

B4X:

Private Sub ChangeResetButton(IsReset As Boolean)
    Dim Enabled, Disabled As BitmapDrawable
    Dim sld As StateListDrawable

    'bitmap state
    If IsReset Then
        Enabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_reset_enabled.png", btnReset.Width, btnReset.Height))
        Disabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_reset_disabled.png", btnReset.Width, btnReset.Height))
    Else
        Enabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_next-speed_enabled.png", btnReset.Width, btnReset.Height))
        Disabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_next-speed_disabled.png", btnReset.Width, btnReset.Height))
    End If

    'initialize statelistdrawable
    sld.Initialize
    'add states
    sld.AddState(sld.State_Pressed, Disabled)
    sld.AddState(sld.State_Enabled, Enabled)
    sld.AddState(sld.State_Disabled, Disabled)
    
    'set background as state
    btnReset.Background = sld
End Sub

The error is triggered by these 3 devices: Galaxy S10( android 12), Redmi 7( android 10), Honor 8S(android 9)
The control "btnReset" is initialized with certainty, it is in the main layout.
How can I catch the error?
Should I check before each "LoadBitmapSample" if btnReset.Width and btnReset.Height is greater than zero?

Thanks for the help
Filippo

Erel · Sep 26, 2023

You need to find out why the width or height are zero.

Another option is to set a limit for the size before you load the bitmap:

B4X:

btnReset.Width = Max(btnReset.Width, 20dip)
btnReset.Height = Max(btnReset.Height, 20dip)

Filippo · Sep 26, 2023

Erel said:
You need to find out why the width or height are zero.

Another option is to set a limit for the size before you load the bitmap:

B4X:

btnReset.Width = Max(btnReset.Width, 20dip) btnReset.Height = Max(btnReset.Height, 20dip)

I have now changed my procedure so I hope that the error messages will be less or disappear completely.

B4X:

Private Sub ChangeResetButton(IsReset As Boolean)
    Dim Enabled, Disabled As BitmapDrawable
    Dim sld As StateListDrawable
    Dim Width, Height As Int
   
    Width = Max(btnReset.Width, 20dip)
    Height =  Max(btnReset.Height, 20dip)

    'bitmap state
    If IsReset Then
        Enabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_reset_enabled.png", Width, Height)
        Disabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_reset_disabled.png", Width, Height)
    Else
        Enabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_next-speed_enabled.png", Width, Height)
        Disabled.Initialize(LoadBitmapSample(File.DirAssets, "btn_next-speed_disabled.png", Width, Height)
    End If

    'initialize statelistdrawable
    sld.Initialize
    'add states
    sld.AddState(sld.State_Pressed, Disabled)
    sld.AddState(sld.State_Enabled, Enabled)
    sld.AddState(sld.State_Disabled, Disabled)
   
    'set background as state
    btnReset.Background = sld
End Sub

Android Question LoadBitmapSample and java.lang.ArithmeticException - divide by zero

Filippo

Expert

Erel

B4X founder

Filippo

Expert

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Android Question LoadBitmapSample and java.lang.ArithmeticException - divide by zero

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