Android Question Help need with ANR report

Roger Daley

Well-Known Member
Licensed User
Hi All

Play store has logged a couple of ANR's for one of my Apps. The reports ae about 2 weeks apart and from the same type of device [MOTOG].
I have no idea how to read/interpret these reports.

Reading the forum it appears the most common cause of ANRs is large loops.
The only thing I can pick from from the reports is both refer to a sub "send_to_display".
This sub does have loops but should be small unless I have messed up.

Can someone with real knowledge please have a quick look and point me in the right direction.

ANR report attached.

Regards Roger

B4X:
Sub send_to_display(R)     ' according to the requested or required format
    Dim limitdispR As String
    Dim Explen As Int
    Dim NumLength As Double
    Dim digmax As Int
    Dim digmin As Int
    Dim ExplenStr As String
    Dim chars As  String = "0123456789ABCDEF"
    Dim Strnum As String
    Dim Strlength As Int
    Dim Strstart As Int
    Dim Res As String
    Dim j As Int = 0
   
    If Radix_Flag = 10 Then
        If R <> "" Then
            If R = "" Then R = 0
            limitdispR = R
            Explen = 0
            Strlength = 0
            If FSE_Flag < 2 Then                'Display mode is either normal or fixed decimal places
                If FSE_Flag = 1 Then
                    digmax = FSEF
                    digmin = FSEF
                Else
                    digmax = digits
                    digmin = 0
                End If
'If number to big to display convert to exponetial display
                NumLength = Power(10,(13 - digmax))
                If Abs(R) > NumLength Then  '99999
                    Do While Abs(limitdispR) > NumLength '999
                        limitdispR = limitdispR/10
                        Explen = Explen + 1
                        ExplenStr = Explen
                        Strlength = ExplenStr.Length
                    Loop
                    R = limitdispR
                    If Explen < 10 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E0" & Explen
                    End If
                    If Explen > 9 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E" & Explen
                    End If
                   
'If number to small to display convert to exponential display   
                Else If Abs(R) < .0001 AND R <> 0 Then
                    Do While Abs(R) < 1
                        R = R * 10
                        Explen = Explen - 1
                    Loop
                    If Abs(Explen)< 10 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E-0" & Abs(Explen)
                    End If
                    If Abs(Explen) > 9 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E" & Explen
                    End If
                Else   
                    Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                    lblEXP.Text = ""
                End If   
                   
'Display mode is in Scientific Format  n.nnnn Enn
            Else If FSE_Flag = 2 Then           
                digmax = FSES
                digmin = 1
                If Abs(limitdispR) > 10 Then
                    Do While Abs(limitdispR) > 10
                        limitdispR = limitdispR/10
                        Explen = Explen + 1
                        ExplenStr = Explen
                    Loop
                    R = limitdispR
                    If Explen < 10 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E0" & Explen
                    End If
                    If Explen > 9 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E" & Explen
                    End If
                Else If Abs(limitdispR) < 1 AND (limitdispR) <> 0 Then
                    Do While Abs(limitdispR) < 1
                        limitdispR = limitdispR * 10
                        Explen = Explen - 1
                    Loop
                    R = limitdispR
                    If Abs(Explen)< 10 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E-0" & Abs(Explen)
                    End If
                    If Abs(Explen) > 9 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E" & Explen
                    End If
                Else   
                    Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                    lblEXP.Text = " E" & Explen
                End If   
                   
'Display mode is in Engineering Format
            Else If FSE_Flag = 3 Then            
                digmax = FSEE
                digmin = 1
                If Abs(limitdispR) > 1000 Then
                    Do While Abs(limitdispR) > 1000
                        limitdispR = limitdispR/1000
                        Explen = Explen + 3
                        ExplenStr = Explen
                    Loop
                    R = limitdispR
                    If Explen < 10 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E0" & Explen
                    End If
                    If Explen > 9 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E" & Explen
                    End If
                Else If Abs(limitdispR) < 1 AND (limitdispR) <> 0 Then
                    Do While Abs(limitdispR) < 1
                        limitdispR = limitdispR * 1000
                        Explen = Explen - 3
                    Loop
                    R = limitdispR
                    If Abs(Explen)< 10 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E-0" & Abs(Explen)
                    End If
                    If Abs(Explen) > 9 Then
                        Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                        lblEXP.Text = " E" & Explen
                    End If
                Else   
                    Rdisplay.Text = NumberFormat2(R, 1,digmax,digmin,True)
                    lblEXP.Text = " E" & Explen
                End If   
            End If
            Idisplay.Text = ""
        End If
    Else                                    ' Radix_flag = 2 or 8 or 16    
        Res = ""
        Strnum = ""
       
        If R = 0 Then Strnum = 0
        If R <0 Then                        'If number is negative convert to 12 digit signed number
            R = (Power(Radix_Flag,12)+R)
        End If
       
        Do While R > 0                        'Converts number in to character string
            Strnum = chars.charAt(R Mod Radix_Flag) & Strnum
            R = Floor(R / Radix_Flag)
        Loop
       
        Strlength = Strnum.Length
        Strstart = Strlength - Min(Strlength, 12)
        Strnum = Strnum.SubString2(Strstart, Strlength)
        Strnum = Strnum.ToUpperCase
        Strlength = Strnum.Length
       
        For M = Strlength-1 To 0 Step -1        'Adds comma every 4 digits
            Res = Strnum.SubString2(M,M+1) & Res
            j = j + 1
            If (j = 4 OR j = 8) AND Strlength > j Then
                Res = "," & Res
            End If
        Next
        Rdisplay.Text = Res
        lblEXP.Text = ""
    End If
End Sub
 

Attachments

Erel

Administrator
Staff member
Licensed User
My guess is that in some edge case the loop doesn't end.

Go to the Objects\src folder and find main.java. You need to locate line number 10773. This is the line that the main thread was executing when the ANR happened. It can point you to the problematic section in this sub.

Note that it is only relevant if you haven't modified the code since you released it.
 

Roger Daley

Well-Known Member
Licensed User
Thank Erel,

Spot on the mark.
Both ANR's show up as in loops, although different loops within the same sub. Now that I know where to look I have a chance of finding the problem.
Another brick in the wall of knowledge.

Regards Roger
 
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