Android & Flutter 05 Camera++

androidFlutter05.dart

import 'dart:typed_data';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main(){
  WidgetsFlutterBinding.ensureInitialized();
  GestureBinding.instance.resamplingEnabled = true;
  return runApp(MaterialApp(home: MyApp(),));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final MethodChannel channel = new MethodChannel("app.james.cam/cam");
  MethodChannel emitChannel;
  Uint8List data;
  String btnTxt = "촬영";
  @override
  void initState() {
    emitChannel = new MethodChannel("app.james.cam/cam2")..setMethodCallHandler((call){
      if(call.method == "sendImg"){
        final Uint8List _data = call.arguments;
        setState(() {
          this.data = _data;
          btnTxt = "지우기";
        });
      }
      return;
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(),
        body: Container(
          child: Stack(
            children: [
              Positioned(
                width: 200.0,
                height: 200.0,
                top: 0,
                left: 0,
                child: Container(
                  decoration: this.data == null
                    ? BoxDecoration(color: Colors.grey,)
                    : BoxDecoration(
                        image: DecorationImage(
                          image: MemoryImage(this.data,),
                          fit: BoxFit.cover
                        )
                      )
                ),
              ),
              Positioned(
                top: 0,
                left: 5,
                child: RaisedButton(
                  child: Text(btnTxt),
                  onPressed: _click,
                ),
              ),
            ],
          ),
        )
    );
  }

  Future<void> _click() async{
    if(this.data != null){
      setState(() {
        this.data = null;
        btnTxt = "촬영";
      });
      return;
    }
    await channel.invokeMethod('cam');
    return;
  }
}