使AppBar透明并显示设置为全屏的背景图像 [英] Make AppBar transparent and show background image which is set to whole screen

问题描述

我在Flutter应用程序中添加了 AppBar .我的屏幕已经有一个背景图像，我不想设置appBar颜色或不想为appBar设置单独的背景图像.

I have added AppBar in my flutter application. My screen already have a background image, where i don't want to set appBar color or don't want set separate background image to appBar.

我也想向appBar显示相同的屏幕背景图像.

I want show same screen background image to appBar also.

我已经尝试过将appBar颜色设置为透明，但是它显示的颜色像灰色.

I already tried by setting appBar color as transparent but it shows color like gray.

示例代码:

appBar: new AppBar(
        centerTitle: true,
//        backgroundColor: Color(0xFF0077ED),
        elevation: 0.0,
        title: new Text(
            "DASHBOARD",
            style: const TextStyle(
                color:  const Color(0xffffffff),
                fontWeight: FontWeight.w500,
                fontFamily: "Roboto",
                fontStyle:  FontStyle.normal,
                fontSize: 19.0
            )),
      )

推荐答案

，您可以使用Stack小部件来做到这一点.请按照下面的示例.

you can use Stack widget to do so. Follow below example.

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Home(),
    );
  }
}

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: <Widget>[
          Scaffold(
            backgroundColor: Colors.transparent,
            appBar: new AppBar(
              title: new Text(
                "Hello World",
                style: TextStyle(color: Colors.amber),
              ),
              backgroundColor: Colors.transparent,
              elevation: 0.0,
            ),
            body: new Container(
              color: Colors.red,
            ),
          ),
        ],
      ),
    );
  }
}

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