Integrate with dart-define

[edTheGuy00]

--dart-define variables are accesible in gradle with project.property('dart-defines') , and on iOS via ios/Flutter/Generated.xcconfig this could potentially be an alternative to using a .env file, as --dart-define variables are more easily accesible on the flutter engine with String.fromEnvironment("MY_VAR") and int.fromEnvironment("MY_VAR")

Simple script in gradle to make dart-define variables into a map

project.property('dart-defines')
            .split(',')
            .collectEntries { entry ->
                def pair = URLDecoder.decode(entry).split('=')
                [(pair.first()): pair.last()]
            }

Simple Build pre-action script for xcode

function urldecode() { : "${*//+/ }"; echo "${_//%/\\x}"; }

   IFS=',' read -r -a define_items <<< "$DART_DEFINES"

for index in "${!define_items[@]}"
do
    define_items[$index]=$(urldecode "${define_items[$index]}");
done

printf "%s\n" "${define_items[@]}" > ${SRCROOT}/Flutter/Dart-defines.xcconfig

Things to note:

• This will not be a replacement, but an alternative. Users can either chose to use a .env file or --dart-define
• If both .env and --dart-define are used, the map for .env variables will be created first and the --dart-define variables will be appended.

[edTheGuy00]

as of Flutter 2.2.0, dart defined variables are base64 encoded.

decode using

gradle:

byte[] decoded = entry.decodeBase64()

iOS:

function base64decode() { echo "$1" | base64 -d ; echo; }

decoded=$(base64decode "${define_items[$index]}");
define_items[$index]=$(urldecode "${decoded[$index]}");

[pepe19000]

as of Flutter 2.2.0, dart defined variables are base64 encoded.

decode using

gradle:

byte[] decoded = entry.decodeBase64()

iOS:

function base64decode() { echo "$1" | base64 -d ; echo; }

decoded=$(base64decode "${define_items[$index]}");
define_items[$index]=$(urldecode "${decoded[$index]}");

And how can i get key-value pair from decoded variables?

[IlyaOstashkov]

as of Flutter 2.2.0, dart defined variables are base64 encoded.
decode using
gradle:

byte[] decoded = entry.decodeBase64()

iOS:

function base64decode() { echo "$1" | base64 -d ; echo; }

decoded=$(base64decode "${define_items[$index]}");
define_items[$index]=$(urldecode "${decoded[$index]}");

And how can i get key-value pair from decoded variables?

You can use that https://medium.com/@tatsu.ukraine/flutter-2-2-dart-defines-and-breaking-changes-here-we-go-again-ce40cfea74fd