Support EventChannel(s)

[larssn]

Recommend supporting Streams through EventChannel, as it makes some operations easier (like having a listener running in the background).

Then it would be possible to having a simple API like:

var streamSub = FlutterNfcKit.tags.listen((tag) {
   print(tag);
});

Just a suggestion. Sadly I have no time to do a PR.

[Harry-Chen]

This is possible, but will become a total different set of APIs. Maybe the foreground dispatch mode mentioned in #17 can work together with this Stream-like API.

[luckycreationsindia]

How about this,

Stream<NFCTag> tags = Stream.fromFuture(FlutterNfcKit.poll(options));

var streamSub = tags.listen((tag) {
   print(tag);
});

[luckycreationsindia]

I'll create pull request (If required) which will implement this feature and will not affect existing functionality.

Here's what will be changed:

New Class TagPollOptions will be Introduced:

`
class TagPollOptions {
TagPollOptions({
this.timeout,
this.androidPlatformSound = true,
this.androidCheckNDEF = true,
this.iosAlertMessage = "Hold your iPhone near the card",
this.iosMultipleTagMessage = "More than one tags are detected, please leave only one tag and try again.",
this.readIso14443A = true,
this.readIso14443B = true,
this.readIso18092 = false,
this.readIso15693 = true,
this.probeWebUSBMagic = false,
});

final Duration? timeout;
final bool androidPlatformSound;
final bool androidCheckNDEF;
final String iosAlertMessage;
final String iosMultipleTagMessage;
final bool readIso14443A;
final bool readIso14443B;
final bool readIso18092;
final bool readIso15693;
final bool probeWebUSBMagic;
}
`

New method to set options for stream:

FlutterNFCKit.setTagStreamOptions = TagPollOptions(...)

New stream:

var streamSub = FlutterNFCKit.tags.listen((tag) { print(tag); });

[Harry-Chen]

@luckycreationsindia It is great if you could submit a PR on EventChannel support. Looking forward to it!

[luckycreationsindia]

@luckycreationsindia It is great if you could submit a PR on EventChannel support. Looking forward to it!

It won't be EventChannel but layer in flutter itself. Let me paste the line of code before committing. If it's good to go will commit changes. Also TagPollOptions class is as mentioned above.

`
static TagPollOptions? _options;

static set setTagStreamOptions(TagPollOptions? options) {
_options = options;
}

static Stream tags = Stream.fromFuture(poll(
timeout: _options?.timeout,
androidPlatformSound: _options?.androidPlatformSound ?? true,
androidCheckNDEF: _options?.androidCheckNDEF ?? true,
iosAlertMessage: _options?.iosAlertMessage ?? "Hold your iPhone near the card",
iosMultipleTagMessage:
_options?.iosMultipleTagMessage ?? "More than one tags are detected, please leave only one tag and try again.",
readIso14443A: _options?.readIso14443A ?? true,
readIso14443B: _options?.readIso14443B ?? true,
readIso18092: _options?.readIso18092 ?? false,
readIso15693: _options?.readIso15693 ?? true,
probeWebUSBMagic: _options?.probeWebUSBMagic ?? false,
));
`

[luckycreationsindia]

I've created EventChannel Support for streaming and pull request is added for the same with other information.

Note:

• I've to change sourceCompatibility to JavaVersion.VERSION_1_8 and targetCompatibility to JavaVersion.VERSION_1_8 with kotlin jvmTarget to '1.8' due to incompatibility and will ensure latest flutter version support
• Example is also added for streaming tag
• Streaming will only support Android as of now. I don't know how to handle this in iOS and Web

Pull request