Question

我目前正在用dart编写flutter项目，并使用flutter构建android应用。我目前有一张图像，可将整个屏幕作为启动屏幕。现在，我想提供其他图像，以便用户每次打开应用程序时该应用程序显示随机图像。

我已经搜索了“如何随机化Android的启动屏幕”，但是这都需要修改一些Java代码（但是我正在编写一个dart项目）。还有另一种方法，例如仅修改.dart和/或.xml代码吗？我已将第二张图片添加到其他位置，但是没有任何效果。见下文：

在launch_background.xml中，以下内容仅显示splash_screen_1图像，从不显示splash_screen_2。

<?xml version="1.0" encoding="utf-8"?>
<!-- Modify this file to customize your launch splash screen -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@android:color/white" />

    <!-- You can insert your own image assets here -->
    <item>
        <bitmap
            android:gravity="fill_horizontal|fill_vertical"
            android:src="@drawable/splash_screen_1" />
        <bitmap
            android:gravity="fill_horizontal|fill_vertical"
            android:src="@drawable/splash_screen_2" />
    </item>
</layer-list>

以下仅显示splash_screen_2图片，从不显示splash_screen_1。

<?xml version="1.0" encoding="utf-8"?>
<!-- Modify this file to customize your launch splash screen -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@android:color/white" />

    <!-- You can insert your own image assets here -->
    <item>
        <bitmap
            android:gravity="fill_horizontal|fill_vertical"
            android:src="@drawable/splash_screen_1" />
    </item>
    <item>
        <bitmap
            android:gravity="fill_horizontal|fill_vertical"
            android:src="@drawable/splash_screen_2" />
    </item>
</layer-list>

有没有办法解决抖动问题？例如仅修改.xml和/或.dart代码，而无需修改Java代码？谢谢！

Answer 1

尝试一下：

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

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

Widget randomScreen(int max) {
  var rnd = Random();
  var num = rnd.nextInt(max);
  print(num);
  switch (num) {
    case 1: return SecondSplashScreen();break;
    case 2: return ThirdSplashScreen();break;
    default: return FirstSplashScreen();break;
  }
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: randomScreen(4),
    );
  }
}

class FirstSplashScreen extends StatefulWidget {
  FirstSplashScreen({Key key}) : super(key: key);

  _FirstSplashScreenState createState() => _FirstSplashScreenState();
}

class _FirstSplashScreenState extends State<FirstSplashScreen> {
  @override
  Widget build(BuildContext context) {
    return Container(
       color: Colors.blue
    );
  }
}


class SecondSplashScreen extends StatefulWidget {
  SecondSplashScreen({Key key}) : super(key: key);

  _SecondSplashScreenState createState() => _SecondSplashScreenState();
}

class _SecondSplashScreenState extends State<SecondSplashScreen> {
  @override
  Widget build(BuildContext context) {
    return Container(
       color: Colors.red
    );
  }
}


class ThirdSplashScreen extends StatefulWidget {
  ThirdSplashScreen({Key key}) : super(key: key);

  _ThirdSplashScreenState createState() => _ThirdSplashScreenState();
}

class _ThirdSplashScreenState extends State<ThirdSplashScreen> {
  @override
  Widget build(BuildContext context) {
    return Container(
       color: Colors.green
    );
  }
}

扑如何在android中随机化启动屏幕

1 个答案: