flutter_ali_camera/example/lib/main.dart

import 'dart:io';
import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_ali_camera/ali_camera.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as path;

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await FlutterAliCameraController.initializeSdk();
  runApp(FirstPage());
}

class FirstPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return FirstPageState();
  }
}

class FirstPageState extends State<FirstPage> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: FirstState(),
    );
  }
}

class FirstState extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RawMaterialButton(
          child: Text("push",),
          onPressed: () {
            Navigator.of(context).push(MaterialPageRoute(builder: (ctx){
              return MyApp();
            }));
          },
        ),
      ),
    );
  }

}

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

class _MyAppState extends State<MyApp> {
  FlutterAliCameraController _controller = FlutterAliCameraController();
  StreamSubscription _durationSubscription; // 播放进度订阅
  final int duration = 5000;
  double value = 0;
  bool recording = false;
  List<String> recordPath = List();

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    _durationSubscription.cancel();
    _controller.dispose();
    super.dispose();
  }

  void _onPlatformViewCreated() {
    initPlatform();
  }

  Future<void> initPlatform() async {
    await _controller.create(
        recordOption: CameraRecordOption(
            videoWidth: 720, videoHeight: 1280, quality: VideoQuality.SD));
    _durationSubscription = _controller.recordUpdate.listen((result) {
      print("record update" + result.toString());
      if (result.containsKey("path")) {
        print("录制完成");
        setState(() {
          recording = false;
          recordPath.add(result['path']);
        });
      }
    });
    setState(() {});
  }

  static Future<String> _findLocalPath() async {
    final directory = Platform.isAndroid
        ? await getExternalStorageDirectory()
        : await getApplicationDocumentsDirectory();
    return directory.path;
  }

  Future<void> _record() async {
    setState(() {
      recording = true;
    });
    String mp4Path = path.join(await _findLocalPath(), "1.mp4");
    _controller.startRecord(duration, mp4Path);
  }

  void _compose() async {
    if (recordPath.length == 0) return;
    String resultPath = path.join(await _findLocalPath(), "result.mp4");
    bool success = await _controller.startCompose(
      resultPath,
      null,
      recordPath,
      recordPath.map((f) => duration).toList(),
      CameraComposeOption(
          outputWidth: 480,
          outputHeight: 480 * 16 ~/ 9,
          videoCodecs: VideoCodecs.H264_HARDWARE,
          quality: VideoQuality.SD,
          frameRate: 20,
          bitrate: 500000),
    );
    print("compose result: ${success ? "successful" : "failed"}");
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        title: const Text('Plugin example app'),
      ),
      body: ListView(
        padding: EdgeInsets.symmetric(horizontal: 10),
        children: <Widget>[
          SizedBox(
            width: double.maxFinite,
            height: 200,
            child: _controller.buildView(_onPlatformViewCreated),
          ),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: <Widget>[
              IconButton(
                  icon: Icon(
                    Icons.play_arrow,
                    size: 26,
                  ),
                  onPressed: () {
                    if (!recording) _controller.startPreview();
                  }),
              IconButton(
                  icon: Icon(
                    Icons.pause,
                    size: 26,
                  ),
                  onPressed: () {
                    if (!recording) _controller.stopPreview();
                  }),
              IconButton(
                  icon: Icon(
                    Icons.switch_camera,
                    size: 26,
                  ),
                  onPressed: () {
                    if (!recording) _controller.switchCamera();
                  }),
              IconButton(
                  icon: Icon(
                    recording ? Icons.stop : Icons.fiber_manual_record,
                    size: 26,
                  ),
                  onPressed: () {
                    if (!recording) _record();
                  }),
              IconButton(
                  icon: Icon(
                    Icons.settings,
                    size: 26,
                  ),
                  onPressed: () {
                    if (!recording) _compose();
                  }),
            ],
          ),
          SizedBox(
            height: 5,
          ),
          Row(
            children: <Widget>[
              Text("美颜0-100"),
              Expanded(
                child: Slider(
                    value: value,
                    max: 100,
                    onChanged: (value) {
                      _controller.setBeauty(value.toInt());
                      setState(() {
                        this.value = value;
                      });
                    }),
              ),
            ],
          ),
        ],
      ),
    );
  }
}