Gradle crashing when adding WRITE_EXTERNAL_STORAGE to android.permissions in buildozer.spec

[Hugo Cezar]

When adding additional permissions in buildozer.spec the compilation fails and I get the following error:

By removing WRITE_EXTERNAL_STORAGE from buildozer.spec the build completes but I need the storage permissions. Can someone help me?

[Hugo Cezar]

I resolved the issue by deleting a supposedly duplicate line from AndroidManifest.tmpl.xml:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="29"/>

But even though the build is working with the storage permission, I'm getting another error when saving a file in the Downloads folder:

PermissionError: [Errno 13] Permission denied: '/storage/emulated/0/Download/teste.txt'

Even accepting the processing I'm getting this error. Someone help me please

[Robert]

I was writing as you posted the second part, both issues addressed (sort of):

WRITE_EXTERNAL_STORAGE has no meaning for api >=29  , so there may be more than one issue here:

1) p4a adds WRITE_EXTERNAL_STORAGE for api<29  so that is the cause of the duplicate WRITE_EXTERNAL_STORAGE
Just remove yours

2) > but I need the storage permissions

Back to WRITE_EXTERNAL_STORAGE meaning, Android storage changed with api 29 , 

https://github.com/Android-for-Python/Android-for-Python-Users#android-storage

and p4a now defaults to 31, and 33 is current.  

https://github.com/Android-for-Python/Android-for-Python-Users#androidapi

I assume you are using api 27, there may be an issue running on Android 10+ and the PlayStore certainly won't accept anything less than 31.
But if it works for you you are probably OK for a while.

3) Unrelated, building on the Windows partition can cause strange issues with some packages

See https://github.com/kivy/buildozer/blob/master/docs/source/installation.rst#android-on-windows-10-or-11
Or https://github.com/Android-for-Python/Android-for-Python-Users#install

[Robert]

I see there is an extra potential issue (and this may depend on device Android version, but its not portable design)
See para 3    https://github.com/Android-for-Python/Android-for-Python-Users#storage-permissions

[Hugo Cezar]

Hello Roberto, thank you for your attention and for your time. I'm using the android's api 31 but from what I understand, I won't be able to write files in the shared storage of the android, only in the private storage that is the directory of my application, with this information I did a test by creating a file in the installation directory of my application and I get something strange in logcat:

I researched about this error and it's something about the logcat buffer, I didn't quite understand.

I confess that using private storage will not solve my problem, I need other applications to see the file, I need to use shared storage. I will continue reading the documents you sent me. Thank you very much.

Yes, I'm using Windows WSL to build my application, I saw that this could mess up the compilation, so I decided to put my project files in the WSL root folder /home/user/myproject, but that didn't solve my problem also it kept denying permission from file write, but it must be because of API and android version 10.

[Hugo Cezar]

Thank you.

[Robert]

You will find it is possible to copy files to and from shared storage.

Sorry I don't know what those messages are.

[Hugo Cezar]

Yep, one of the solutions is to use androidstorage4kivy library, this is really working. Thank you very much :D

[Robert]

:)