Lack of android support

[Kranzes]

Does this support building an android-based flutter app? By looking at the platforms folder, there seems to be an android.nix file. When using buildFlutterApp with platforms = "android" I get an error which says that only linux and web are supported.

[ilkecan]

Hi, sorry for the lack of documentation.

Currently buildFlutterApp doesn't support android because I wasn't able to generate the list of gradle dependencies fully. The ones listed in the lock files generated with gradle was not enough. I tried using gradle2nix but it didn't work; either because of flutter or my lack of understanding of gradle. I have an idea to create a proxy server to track the requests to all gradle dependencies but I am not sure whether that would work.

So, currently it is only possible to create a development environment for android.

[Kranzes]

From the development environment I wasn't able to flutter build apk it, it complained about a read only SDK (/nix/store.).

[ilkecan]

Did you use the flutter-nix.mkShell function and defined enableAll or enableAndroid as true? I was using the "friendly_chat" project to try this on and flutter build apk works on that. Can you provide the full output of the error?

[Kranzes]

I did use enableAndroid in flutter-nix.mkshell.
I am trying to building https://github.com/UnicornsOnLSD/finamp

This is the output:

Running "flutter pub get" in finamp...                             809ms

💪 Building with sound null safety 💪

Running Gradle task 'assembleRelease'...
Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01
Warning: Mapping new ns http://schemas.android.com/repository/android/generic/02 to old ns http://schemas.android.com/repository/android/generic/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01
Warning: Mapping new ns http://schemas.android.com/repository/android/generic/02 to old ns http://schemas.android.com/repository/android/generic/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
Checking the license for package Android SDK Platform 31 in /nix/store/jak8fh19yya73fzlrhkdsn8fl156f4as-android-sdk-env/share/android-sdk/licenses
License for package Android SDK Platform 31 accepted.
Preparing "Install Android SDK Platform 31 (revision: 1)".
Warning: Failed to read or create install properties file.

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':flutter_downloader:compileReleaseAidl'.
> Failed to install the following SDK components:
      platforms;android-31 Android SDK Platform 31
  The SDK directory is not writable (/nix/store/jak8fh19yya73fzlrhkdsn8fl156f4as-android-sdk-env/share/android-sdk)


* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
Running Gradle task 'assembleRelease'...                         1,801ms
Gradle task assembleRelease failed with exit code 1

[ilkecan]

I confirmed that simply copying the flake.nix from the "friendly_chat" example produces the above error for finamp.

This is the file that creates the SDK derivation from the given arguments. Note that SDK platforms 30 is hardcoded in there. I don't have any android development experience, so the reason I hardcoded that value was I thought the SDK version must be related to the flutter version. But I can see how that is not the case now.

After adding platforms-android-31 to the list it complained about SDK version 29 this time. So I had to specify three SDK versions like this:

androidSdk (sdkPkgs: with sdkPkgs; [
  build-tools-29-0-2
  cmdline-tools-latest
  platform-tools
  platforms-android-29
  platforms-android-30
  platforms-android-31
])

I have no idea how to query which SDK versions are required so that we can remove the hardcoded value of platforms-android-30. We can probably parameterize the mkShell function to specify the required SDKs by the user but I would prefer to determine those if possible.