video_launcher 0.3.0

video_launcher: ^0.3.0 copied to clipboard

example/lib/main.dart

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

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:http/http.dart';
import 'package:path_provider/path_provider.dart';
import 'package:video_launcher/video_launcher.dart';

void main() {
  runApp(new MyApp());
}

typedef void OnError(Exception exception);

const videoUrl = "http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4";

/// a video launcher, based on url_launcher
/// can read remote and local files
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Video Launcher',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'Video Launcher'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Future<Null> _launched;
  String localVideoPath;
  String localAssetPath;

  _buildButton(String label, VoidCallback onPressed) => new Padding(
      padding: new EdgeInsets.all(12.0),
      child: new RaisedButton(
        onPressed: onPressed,
        child: new Text(label),
      ));

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

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                new Padding(
                  padding: new EdgeInsets.all(16.0),
                  child: new Text(videoUrl),
                ),
                _buildButton('Play online', _launch),
                _buildButton(
                    'Download', localVideoPath != null ? null : _loadVideo),
                _buildButton(
                    'Play local', localVideoPath != null ? _launchLocal : null),
                _buildButton('Play video asset', _loadOrLaunchLocalAsset),
              ],
            ),
            new FutureBuilder<Null>(future: _launched, builder: _launchStatus),
          ],
        ),
      ),
    );
  }

  void _launch() => setState(() => _launched = _launchVideo(videoUrl));

  void _launchLocal() =>
      setState(() => _launched = _launchVideo(localVideoPath, isLocal: true));

  void _loadOrLaunchLocalAsset() =>
      localAssetPath != null ? _launchLocalAsset() : copyLocalAsset();

  Future copyLocalAsset() async {
    final dir = await getApplicationDocumentsDirectory();
    final file = new File("${dir.path}/video_asset.mp4");
    final videoData = await rootBundle.load("assets/video.mp4");
    final bytes = videoData.buffer.asUint8List();
    await file.writeAsBytes(bytes, flush: true);
    setState(() {
      localAssetPath = file.path;
      _launchLocalAsset();
    });
  }

  void _launchLocalAsset() =>
      _launched = _launchVideo(localAssetPath, isLocal: true);

  Widget _launchStatus(BuildContext context, AsyncSnapshot<Null> snapshot) {
    String info;
    if (snapshot.hasError) {
      return new Text('Error: ${snapshot.error}');
    } else {
      info = localVideoPath != null ? localVideoPath : '';
    }
    return new Padding(
        padding: new EdgeInsets.only(top: 20.0), child: new Text(info));
  }

  Future<Null> _launchVideo(String url, {bool isLocal: false}) async {
    if (await canLaunchVideo(url, isLocal: isLocal)) {
      await launchVideo(url, isLocal: isLocal);
    } else {
      throw 'Could not launch $url';
    }
  }

  Future _loadVideo() async {
    final bytes = await _loadFileBytes(videoUrl,
        onError: (Exception exception) =>
            print('_MyHomePageState._loadVideo => exception ${exception}'));

    final dir = await getApplicationDocumentsDirectory();
    final file = new File('${dir.path}/video.mp4');

    await file.writeAsBytes(bytes);
    if (await file.exists())
      setState(() {
        localVideoPath = file.path;
      });
  }

  Future<Uint8List> _loadFileBytes(String url, {OnError onError}) async {
    Uint8List bytes;
    try {
      bytes = await readBytes(url);
    } on ClientException {
      rethrow;
    }
    return bytes;
  }
}