Files and folders

MIT App Inventor Help
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