Android Question Code problem (FAILED_VERSION_DOWNGRADE) (Solved)

[Shelby]

The following error doesn't give me a clue as to what I need to do. Any suggestions?

Installing file to device.    Error adb: failed to install Date_tomorrow_RAPID_DEBUG.apk: Failure [INSTALL_FAILED_VERSION_DOWNGRADE]

 

[Shelby]

I'm just practicing trying to get the date tomorrow to display......

Sub Globals
    Dim Tomorrow As Long   
    Private lblDate As Label
End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    Activity.LoadLayout("Tomorrow")   
    Tomorrow = DateTime.Add(DateTime.Now, 0, 0, 1)
    Log("Tomorrow’s date is: " & DateTime.Date(Tomorrow))
End Sub
Sub Date_Tomorrow
    '?????

End Sub


Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

 

[Shelby]

My phone says app not installed. The bridge says connected. Also even my log won't show tomorrow's date.

Activity.LoadLayout("Tomorrow")
    Tomorrow = DateTime.Add(DateTime.Now, 0, 0, 1)
    Log("Tomorrow’s date is: " & DateTime.Date(Tomorrow))
    Activity.Initialize("")

 

[Geezer]

From the error message, it sounds like you're trying to install an earlier version, but I could be wrong.

Try uninstalling the app and then rebuild and let it install again

 

[karld]

Failure [INSTALL_FAILED_VERSION_DOWNGRADE]
This tells you what is wrong.

Looks like you are trying to install an apk that has an older version than one currently installed.

 

[Dey]

checks the manifest editor
<uses-sdk android

 

[Shelby]

O.K.,
Thanks Geez, Karl, Dey

 

[Dey]

I changed the manifest from version 26 to 28...still no change. I notice that I don't have anything initiated. That's obviously a sign that something is lacking.

try uninstalling apps

 

[Shelby]

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
   
    Activity.LoadLayout("Tomorrow")
    Tomorrow = DateTime.Add(DateTime.Now, 0, 0, 1)
    Log("Tomorrow’s date is: " & DateTime.Date(Tomorrow))
    lblDate.Initialize("")
   
End Sub
Sub Date_Tomorrow
    '?????
End Sub

Thanks Dey; that worked. Now I'm not sure what to initialize. I tried Activity.Initialize. Even my log won't show tomorrow's date. I'll try adding library: DateUtils and I'll check an Erel tutorial or two.

 

[Computersmith64]

It's not the target sdk version that's the issue, it's the build version of the app. In your Main activity, right at the top is #Region Project Attributes. In there you have:

#VersionCode: 
#VersionName:

Make sure your #VersionCode is equal to or larger than the previous build, otherwise it will not install.

- Colin.

 

[Erel]

Make sure your #VersionCode is equal to or larger than the previous build

This is the correct answer.

You can also uninstall the existing app and then install it again.

 

[Shelby]

Thanks Guys,
I hope that's the general rule I was searching for. Now on my own (working for months) app I see 1 as the version code which works fine. The new experimental b4a projects have that field blank. I'll use 1 and not understand what that 1 means and see if it works....it did not work. After using 8.5 in that field I had the same error message. Finilly when I used 8 as the version code all went well with the compiling. If I click the field on the emulator the date and time disappear. I don't understand what it all means.

 

[Erel]

VersionCode must be an integer.

 

[Shelby]

I tried 1,2,3,4,5,6 and 7 with no success but 8 worked. 8.5 and 8.50 did not work. My phone (S9) now works as well with the bridge. Playing around with the version I tried 9 and it worked. Then when trying 8 again it failed. Nine worked again and I see that apparently I must not go too high with the version number or can't reduce any future version code number below the highest ever used.
Thanks again Erel, Dr. Smith, Dey, and Geezer.

 

[Erel]

8.5 and 8.50 did not work.

It must be an integer.

I tried 1,2,3,4,5,6 and 7

This means that you previously installed an app with the same package name and VersionCode set to 8.

The solution is very simple. Set it to a higher value or uninstall the existing app.

 

[Shelby]

O.K., Now I see how to get the version code number back to a smaller number if desired; just rebuild it and, or I guess rename it since you said this numbering is pertaining to the same package name.
Ah.....all is well now.