Can't create folder in Android 10

[SteveJG]

This is much simpler than using the extension Anke recommended... thanks @ewpatton!

The image is the 2.2 emulator. Tested also on 8.1 Android.

-- Steve

[Anke]

@ewpatton

Note that the version number of the current platform can be retrieved by using the PlatformVersion property of the Screen component. This will return the user-facing version number as a string, such as "10.0" or "8.1".

Ohh, I didn't notice that. Thanks.

[Anke]

@Isaac_Perez

Could you clarify, which contains the block "replace all text call Taif ..."?

Does it work on your device?

[Isaac_Perez]

In Android 10 it works correctly.

But after doing several tests, I see that I can have problems with the previous versions of android 10 if I want to save the files in the root folder of the application.

I cannot save the files in the root directory with the extension "call AplicationSpecificDirectory" from Taifun on a device with Android 4.4.2

I was hoping that these blocks that I attach you save in the file at: /storage/sdcard0/Android/data/appinventor.ai.bulone6868.test/files/a.txt

But it saves it in:
/storage/sdcard0/storage/emulated/0/Android/data/appinventor.ai.bulone6868.test/files/a.txt

So I think the simplest thing in my case (for now) will be to save the files in the root folder for Devices smaller than Android 10 and in the application folder for those older than Android 10. (In both cases I have created another folder to have the files sorted)

This is how the blocks would be:

prueba_version_2.aia (34.2 KB)

Can you think of any other solution?

Thank you very much

[vknow360]

Android KitKat has an issue.It takes /storage/sdcard0 as root directory.
Your blocks are correct and will work fine.

[Anke]

@Isaac_Perez

In Android 10 it works correctly.

... and also on devices with Android < 10.

@Isaac_Perez

But after doing several tests, I see that I can have problems with the previous versions of android 10 if I want to save the files in the root folder of the application.

I cannot save the files in the root directory with the extension "call AplicationSpecificDirectory" from Taifun on a device with Android 4.4.2

I changed some blocks of your aia:

@Isaac_Perez

prueba_version_2.aia (34.2 KB)

This should work on all Android versions.

See also here:

Some basics on Android storage system

[Isaac_Perez]

@Anke

Cambié algunos bloques de tu aia:

@Anke

Esto debería funcionar en todas las versiones de Android

In my device with Android 4.4.2 with those blocks it does not work.

This is the error:

.

[Anke]

@Isaac_Perez

This is the error:

Check this APK (on your Android 4.4.2 device):

https://drive.google.com/file/d/1W6XmqAm7dZQGCOqnFw0ADPQFg1bSon8u/view?usp=sharing

and post a screenshot after clicking on "save file" button.

Blocks

Should look like this:

[Isaac_Perez]

Here is the screenshot:

The file saves it correctly, but the path is not:

/ storage / emulated / 0 / my folder / a.txt

if not that is saved in:

/ storage / sdcard0 / my folder / a.txt

that's why substituting:

/ storage / emulated / 0

by :

/sdcard

I get it to work fine on all Android versions regardless of how the path starts

[Anke]

@Isaac_Perez

Here is the screenshot:

Ok, I see. So try this one:

prueba_version_2b.apk

and post the screenshot after pressing on save file.

Blocks

[Anke]

@Isaac_Perez

that's why substituting:

/ storage / emulated / 0

This path

/storage/emulated/0

should work on all Android versions.

I checked my app (prueba_version_2b.apk) on a Galaxy S3 (Android 4.3):
It works.

[Anke]

@ewpatton

This will return the user-facing version number as a string, such as "10.0" or "8.1".

Yes, but this is the problem, see e.g. here:

@Isaac_Perez

Here is the screenshot:

So we have to list all Android versions beforehand in order to be able to query that.
https://source.android.com/setup/start/build-numbers

[Anke]

@SteveJG

This is much simpler than using the extension Anke recommended

No, it's much more compiled.

[Anke]

For some purposes it could be done this way:

But only Android 4

• Ice Cream Sandwich
• Jelly Bean
• KitKat and
• Wear

has 19 versions.

[Isaac_Perez]

@Anke

K veo. Así que prueba este:

drive.google.com

prueba_version_2b.apk

Archivo de Google Drive.

y publique la captura de pantalla después de presionar save file .

Here is the screenshot:

[ewpatton]

You can use this procedure to compare the version numbers even if the number has major, minor, and patch numbers:

For example, it should work correctly if you test against "4.4.2" as a version even though it isn't a mathematical number.

[Anke]

Yes, but is this really simpler than using this small extension:

Get the API Level of the device

This is an extension to get the API level of the device from the Android version that is currently running. de.bodymindpower.GetApiLevel.aix (4.8 KB) That's all: [grafik] Update (Dec. 30, 2021, ver 3): GetApiLevel_3.aix (5.0 KB) [grafik]

[Anke]

@Isaac_Perez

Here is the screenshot:

This would be the first device on that

/storage/emulated/0

does NOT work. So please let me know which device is it.

But as you can see (→ your screenshot) /my folder/a.txt is created:

So it seems that TaifunFile.Exists doesn't work correctly.
Check if the file a.txt exists on your device (manually).
If so, does share file work?

[ewpatton]

If you want it to work on iOS, you won't have a choice. Also, you can drag that picture into App Inventor to add it to your project, no extension required, keep it in the backpack, etc.

[Anke]

@ewpatton

If you want it to work on iOS, you won't have a choice.

So it already seems to be certain that extensions will not be possible under iOS.
I already thought so.

I build my iOS apps with Xcode & Swift.