登录时Flutter中的全屏视频背景 [英] Full screen video background in Flutter on Login

问题描述

我想在我的登录页面中显示一个视频，例如Spotify，在其中您可以播放视频以及用于登录或注册的按钮:

I want to display a video in my Login Page like Spotify in which you can have a video playing and buttons to sign in or register:

这是我到目前为止发现的插件:

This is the plugin I found so far:

video_player 0.7.2 但我认为目的是不同的.

video_player 0.7.2 But I think the purpose is different.

我知道如何显示图像，但是我无法使用上面的插件代替图像.这就是我现在使用图像作为背景的方式

I know how to display an image but I couldn't manage to use the plugin above instead of the image. This is what I have now using a image as a background

body: new Container(
    height: MediaQuery.of(context).size.height,
    decoration: BoxDecoration(
      color: Colors.redAccent,
      image: DecorationImage(
        colorFilter: new ColorFilter.mode(
            Colors.black.withOpacity(0.1), BlendMode.dstATop),
        image: AssetImage('assets/my_image.jpg'),
        fit: BoxFit.cover,
      ),
    ),
    ...
  ..

感谢和良好的编码

推荐答案

使用FittedBox小部件处理溢出的解决方案:

A solution which handles overflow using a FittedBox widget:

Stack(
  children: <Widget>[
    SizedBox.expand(
      child: FittedBox(
        fit: BoxFit.cover,
        child: SizedBox(
          width: _controller.value.size?.width ?? 0,
          height: _controller.value.size?.height ?? 0,
          child: VideoPlayer(_controller),
        ),
      ),
    ),
    LoginWidget()
  ],
)

一个完整的例子是:

import 'package:video_player/video_player.dart';
import 'package:flutter/material.dart';

void main() => runApp(BackgroundVideo());

class BackgroundVideo extends StatefulWidget {
  @override
  _BackgroundVideoState createState() => _BackgroundVideoState();
}

class _BackgroundVideoState extends State<BackgroundVideo> {
  VideoPlayerController _controller;

  @override
  void initState() {
    super.initState();
    _controller = VideoPlayerController.network(
        'http://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_20mb.mp4')
      ..initialize().then((_) {
        _controller.play();
        _controller.setLooping(true);
        // Ensure the first frame is shown after the video is initialized
        setState(() {});
      });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Stack(
          children: <Widget>[
            SizedBox.expand(
              child: FittedBox(
                fit: BoxFit.cover,
                child: SizedBox(
                  width: _controller.value.size?.width ?? 0,
                  height: _controller.value.size?.height ?? 0,
                  child: VideoPlayer(_controller),
                ),
              ),
            ),
            LoginWidget()
          ],
        ),
      ),
    );
  }

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

class LoginWidget extends StatelessWidget {
  const LoginWidget({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: <Widget>[
        Container(),
        Container(
          padding: EdgeInsets.all(16),
          width: 300,
          height: 200,
          color: Colors.grey.withAlpha(200),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: <Widget>[
              TextField(
                decoration: InputDecoration(
                  hintText: 'Username',
                ),
              ),
              TextField(
                decoration: InputDecoration(
                  hintText: 'Password',
                ),
              ),
              RaisedButton(
                child: Text('Login'),
                onPressed: () {},
              ),
            ],
          ),
        ),
      ],
    );
  }
}

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