Files and folders

MIT App Inventor Help
18

ah yeah,
i copied the files with the desktop pc to the LogFiles folder
so if the files are copied with the App to this folder it will work?

But with Android 10 the files are also not listed?!

19

Yes, but you cannot overwrite / replace existing files, that were not created by the app. So you have to change the file names.

20

ok, i will try it

21

i got it working:

File (received via Bluetooth) is written to ASD -> work on Android10
If File is ok it's copied to Documents/Logfiles -> work on Android 10

So now i want to open this file in a CustomWebview (with file Access and Js)
for that i copy the file from Documents/Logfiles to ASD/files/Webview (where the index.html is saved)

but when opening the webview the App crash and close -> Android 10
this was working before all the file changes

edit: the file is not copied to webview folder (is ASD)

test's on Android 11 are coming later -> i'am have not access all the time

22

i think i got it running.

But i noticed a little Problem:

Creating folders with Android 10 requires Permission for Write external Storage (same for copy?)

But with Android 11 i get an Error message that this permission is not allowed.

is there a nice work around?

23

Creating folder, where?
Show your relevant blocks.

1 Like
24

/storage/emulated/0/Documents/LogFiles
i also cant copy to this location

image
image800×149 14.3 KB

i have to use the permission:

image
image785×227 22.1 KB

Everything for Android 10

edit:
for test i removed the App and Documents/LogFiles

with permission the folders are created
without permission the folders are not created

25

did you try a relative path /Documents/LogFiles together with the scope Shared?
Taifun

1 Like
26

that is working (when the app is opened second time)

any idea why i have to open it twice?

27

Try this:

grafik

grafik
grafik820×250 17 KB

28

That is working👍

29

i think i'am going crazy

now everything is fine on Android 10
but on Android 11 nothing works, i just get following error:

Screenshot_20211209-073201
Screenshot_20211209-0732011080×2220 69.2 KB

No folder is created!
Ankes examples are working with Android 11. And i cant find a difference.

@Anke what is the "call exist"?

Here is my aia, maybe someone find an issue
BlControl(1).aia (967.9 KB)

30

There are two options:

  1. With the → File component:

    grafik
    grafik1351×628 54.6 KB

  2. Without storage permissions (on Android 11+) using the → FileTools extension:

    grafik
    grafik1540×763 69.5 KB

I'd prefer the second one.

2 Likes
31

thank you @Anke. i will try it.

i found the difference between your filetest and my app

default File scope in Screen settings
you had "legacy"
i had "App"

i thought legacy mode wont work in the future?

32

:+1:

DefaultFileScope = Legacy is essentially STILL responsible for which storage permissions are declared in the Manifest. WRITE_EXTERNAL_STORAGE is ONLY declared in the Manifest if DefaultFileScope is set to Legacy in the Designer. And this even under Android 11+, which of course makes no sense, since this permission is no longer available under Android 11+.
I have pointed this out countless times.

1 Like
33

Here are all permissions declared in the Manifest of your app (after setting DefaultFileScope to Legacy):

Permissions 
    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_FILES"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <uses-permission android:name="android.launcher.permission.INSTALL_SHORTCUT"/>
    <uses-permission android:name="android.permission.VIBRATE"/>
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.webkit.resource.VIDEO_CAPTURE"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.webkit.resource.AUDIO_CAPTURE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER"/>
1 Like
34

Thank you @Anke for your Help.

It's now all working as expected.

Maybe one little thing:
Would all this file Stuff work under Android 12? Or will it be a never ending story?
i don't have access to an Android 12 Phone

35

Yes.

I checked it on a Pixel 4XL (Android 12).

36

Nice, thank you so much :+1:

37

@ewpatton what is your opinion on this?
as @Anke pointed out already several times, it does not make sense as it currently is..

Taifun

1 Like