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在Flutter中设置背景图片 / background image

 3 years ago
source link: https://www.bugcatt.com/archives/1711
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有时我们需要给APP的某个页面或某个widget添加背景图. 本篇文章就来记录下如何在Flutter中设置背景图片.

有图有真相, 先来看下我们本篇博客将实现的最终效果:

Flutter-%E8%AE%BE%E7%BD%AE%E8%83%8C%E6%99%AF%E5%9B%BE%E7%89%87-background-image-04.png

速度快的同学直接看下面的核心代码!

创建Flutter项目

创建一个新的Flutter项目, 运行查看一下:

Flutter 设置背景图片 background image-02

空白的, 啥也木有.

添加图片资源

这里为大家提供一个好看的背景图:

下载此图片, 重命名为background.jpg. 我们来将其添加至Flutter项目中.

创建资源目录

创建目录./assets/images, 将上面的图片放到该目录下:

引入pubspec.yaml

进入pubspec.yaml, 将背景图片资源文件路径assets/images/background.jpg进行导入:

flutter:
  uses-material-design: true
  assets:
   - assets/images/background.jpg
这里一定要注意缩进, 若格式有误将会出错!

进行package get或在终端中输入:

flutter packages get

展示背景图

回到./lib/main.dart, 进行代码替换:

Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      )
Container(
        decoration: BoxDecoration(
          image: DecorationImage(
            image: AssetImage("assets/images/background.jpg"),
            fit: BoxFit.cover,
          ),
        ),
        /*child替换为你自己的子widget*/
        child: null,
      )
再次运行项目, 看看是不是成功了!
Flutter-%E8%AE%BE%E7%BD%AE%E8%83%8C%E6%99%AF%E5%9B%BE%E7%89%87-background-image-04.png
Container(
        decoration: BoxDecoration(
          image: DecorationImage(
            image: AssetImage("assets/images/background.jpg"),
            fit: BoxFit.cover,
          ),
        ),
        /*child替换为你自己的子widget*/
        child: null,
      ),

设置背景图其实并不复杂, 我们通过Container的decoration属性来控制了修饰的元素为图片. 相信各位可以举一反三.


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