Flutter can't read from Clipboard

Question

I come asking for quite a specific question regarding Flutter and the Future and await mechanism, which seems to be working, but my Clipboard does not really function while operating with my editable text fields, even following Google's advice on implementation...

This is my code for pasting:

onPressed: () async {
  await getMyData('text');
  _encodingController.text = clipData;
  Scaffold.of(context).showSnackBar(
    new SnackBar(
      content: new Text(
        "Pasted from Clipboard"),
      ),
    );
},

what doesnt work is my paste functionality... While debugging the result of this following function is null, wth?????????

static Future<ClipboardData> getMyData(String format) async {
    final Map<String, dynamic> result =
        await SystemChannels.platform.invokeMethod(
      'Clipboard.getData',
      format,
    );

    if (result == null) {
      return null;
    } else {
      clipData = ClipboardData(text: result['text']).text;
      return ClipboardData(text: result['text'].text);
    }
  }

I am probably using the Futures and async await wrong, would love some guidance!!! Copying is working using the Clipboard Manager plugin! Thanks very much!

Randyranee

Answer 1

You can simply re-use Flutter's existing library code to getData from Clipboard.

ClipboardData data = await Clipboard.getData('text/plain');

Tatiania

Answer 2

First create a method that returns the clipboard data:

    Future<String> getClipBoardData() async {
        ClipboardData data = await Clipboard.getData(Clipboard.kTextPlain);
        return data.text;
    }

Then in your build method

    FutureBuilder(
        future: getClipBoardData(),
        initialData: 'nothing',
        builder: (context, snapShot){
            return Text(snapShot.data.toString());
        },
    ),

Suppuration

Answer 3

Also can be useful if you want to listen for periodic updates from the system clipboard. Originally I replied here, just re-posting the solution:

// creating a listening Stream:
final clipboardContentStream = StreamController<String>.broadcast();

// creating a timer for updates:
Timer clipboardTriggerTime;

clipboardTriggerTime = Timer.periodic(
// you can specify any duration you want, roughly every 20 read from the system
      const Duration(seconds: 5),
      (timer) {
        Clipboard.getData('text/plain').then((clipboarContent) {
          print('Clipboard content ${clipboarContent.text}');
          
          // post to a Stream you're subscribed to
          clipboardContentStream.add(clipboarContent.text);
        });
      },
    );

// subscribe your view with
Stream get clipboardText => clipboardController.stream

// and don't forget to clean up on your widget
@override
void dispose() {
  clipboardContentStream.close();

  clipboardTriggerTime.cancel();
}

Festal

Answer 4

It's works for me:

  _getFromClipboard() async {
    Map<String, dynamic> result =
        await SystemChannels.platform.invokeMethod('Clipboard.getData');
    if (result != null) {
      return result['text'].toString();
    }
    return '';
  }

Kemme