Reading file data from a browsed local file

Blocks are not quite the same because you are adding an extra .txt to the end of the filename

True, I fixed it and it still doesn't work (Edited the post above)

you are using an Android 11 device
currently the file component only can read from the ASD (and not from a random directory) starting from Android 10
therefore follow this advice

this might change after App Inventor targets SDK30...
for details see this thread Testing the next release of MIT App Inventor (nb187) - #37 by ewpatton


You also didn't put a / in front of the filename.....

I have tried to copy the file to the ASD, but even then, the "ReadFrom" function doesn't work..
I started a fresh project with just these blocks and to test it, I still get the error that the file was not found.
I checked if the file was copied successfully, also, I'm displaying the new file path on another label
Here are the blocks:

The result:

I don't quite understand what the SDK30 is and what it will do.. is there anything I can do to get it to work in my current situation or do I have to wait for the new release?

Thank you @Taifun and @TIMAI2 for your help!

your blocks look fine...
which response do you get in the FileTools.FileCopied event?
is the file really there in the ASD where you expect it?

it will bring heavy restrictrions on how to access files in future...
see also @ewpatton's bog here, which has been published 1 year ago
which means in your case, probably without using an extension (which still has to be written) it then is not possible anymore to access a file in the /Download folder if your app did not create it, see also the discussion here Testing the next release of MIT App Inventor (nb187) - #187 by Taifun


It does show that the copying was done successfully. (I removed the "ReadFrom" function so that it won't override the notification from the FileTools.FileCopied event)

Regarding the SDK30, If I do end up fixing what i have now and getting it to work, it won't matter in the future, right?
Thank you

display the response in a label

and check using a file manager, if the file really is in the ASD

sorry, but SDK30 will bring changes to everyone... including you...


Here's the response:


ok, the response is not very helpful...
what about


My apologies I didn't notice that line.. sorry!
How do i check it using a file manager? can it be done with the TinyDB? and if so, can you show how to do it if possible?
Thank you for your time and help!

tested (my blocks) using companion on Android 11, doesn't work for me..error 2101 / not found - not reading file from Download folder

I tried to search for a way to do this but I can't seem to get it to work..
I tried to use your "Exists" function from your extension to check whether the file exists, it shows that it does exist in the ASD (unless i don't understand how it works..)
Here are all the blocks:

Here's the block from your extension that I added:

And here's there result:

What can I do at this point? does the file really exist in the ASD and the whole problem is the "ReadFrom" function? or is something else?
If the "ReadFrom" function is the problem, how can I edit it/fix it, or maybe use something else that will actually read the file?

Thank you..

is there a space after the /?
what happens, if you use a text block together with the text /TestRoute.txt to read the file?

There isn't a space after any of the /.
By using a text block, do you mean like this?

Nothing different happens.. though, if i do change the /TestRoute.txt to anything, say /TestRote.txt, your "Exists" function still returns true, as if the file exists. but a file named /TestRote.txt clearly doesn't exist.
Edit: I did a wrong test. the "Exists" function works, and it only returns true when checking for the TestRoute.txt file, which was copied to the ASD. so the file is in the ASD it seems, but the "ReadFrom" function still isn't working for some reason...

This will try to read file from /storage/emulated/0/TestRoute.txt which does not exist.

no, because starting from Android 10 the file component reads from the ASD (at least currently, this might change after SDK30)

this works for me (Samsung Galaxy A51 running Android 11)


floof.aia (34.4 KB)

1 Like

Good morning, I used your blocks on my Galaxy s20 ultra (android 11) and it worked, but it still displayed an error (but it did read the file, and it displayed the text on a label), this is on android 11.
I think this error comes from the "AfterActivity" event block:

And after clicking Read File:

And as you can see, it doesn't display the file's new path..

Here are the blocks:

Edit: If I try it on another file other than TestRoute.txt, it doesn't work for some reason.. it also doesn't work on a .csv file.

However, when trying it on my Galaxy S8 (I just found out it's running Android 9): it gives the following error:

I know it should be dealt with differently on android <10, though I don't know how to do that. Is it possible to make it work on all versions? like, to add an If statement block to check which version of android, and then do the corresponding method?

Thank you so much for your time and help, it is much appreciated!

ok, you have a working solution to read the file in the ASD then

the activity starter can't pick a file from the assets of the app... you already had a working solution to pick the file previously... why don't you just combine the 2 working solutions?

this is the same error, tha activity starter can't pick files from the assets


As I've stated up there, it's not working for other files, other than the TestRoute.txt.
What you built in your aia works because you manually uploaded the TestRoute.txt file into the media here: image

This isn't what i'm trying to do. what my app needs to do, is allow the user to upload a file (any random .txt/.csv file) from their phone, to the app, and then see the contents on the file. the file cannot be uploaded as a media beforehand... instead, the app should allow the user to access his phone's file, and pick a file from there, and then display the contents in a label.

I tried to use your blocks to do this, but as I said up there, it didn't work for files other than TestRoute.txt, and it still gave an error for some reason.. so as of now, no, I don't have a solution that works :frowning: ..

Pick_file_test.aia (70.3 KB)
Here's my aia if you'd like to have a look at it and test it (if you have time of course..) it's only to specifically test this issue, which is to choose a file from the phone's storage and then display the file's contents in a label.

Uploading the file via the media just beats the whole purpose.. the user has no access to the media nor can they upload the file to the app through there.. it has to be selected (browsed and uploaded) through the activity starter into the app.

I hope this makes it clear, I'm sorry if I misunderstood something..

Again, Thank you so much for help, it is much appreciated!!