ScreenUtil 打release包的问题 about flutter_screenutil HOT 8 CLOSED

希望大佬查看下原因，完善下。PS：ScreenUtil还是很好用的

from flutter_screenutil.

我也遇到类似的问题

运行官方这段代码

    print('Device width:${ScreenUtil.screenWidth}'); //Device width
    print('Device height:${ScreenUtil.screenHeight}'); //Device height
    print(
        'Device pixel density:${ScreenUtil.pixelRatio}'); //Device pixel density
    print(
        'Bottom safe zone distance:${ScreenUtil.bottomBarHeight}'); //Bottom safe zone distance，suitable for buttons with full screen
    print(
        'Status bar height:${ScreenUtil.statusBarHeight}px'); //Status bar height , Notch will be higher Unit px
    print(
        'Ratio of actual width dp to design draft px:${ScreenUtil.getInstance().scaleWidth}'); 
    print(
        'Ratio of actual height dp to design draft px:${ScreenUtil.getInstance().scaleHeight}'); 
    print(
        'The ratio of font and width to the size of the design:${ScreenUtil.getInstance().scaleWidth * ScreenUtil.pixelRatio}');
    print(
        'The ratio of  height width to the size of the design:${ScreenUtil.getInstance().scaleHeight * ScreenUtil.pixelRatio}');

如果 flutter run ，结果：

I/flutter (13647): Device width:1080.0                                  
I/flutter (13647): Device height:1919.9999999999998                     
I/flutter (13647): Device pixel density:2.75                            
I/flutter (13647): Bottom safe zone distance:0.0                        
I/flutter (13647): Status bar height:66.0px                             
I/flutter (13647): Ratio of actual width dp to design draft px:0.5236363636363637
I/flutter (13647): Ratio of actual height dp to design draft px:0.5233746762982144
I/flutter (13647): The ratio of font and width to the size of the design:1.4400000000000002
I/flutter (13647): The ratio of  height width to the size of the design:1.4392803598200896

但是 flutter fun --profile / --release 结果：

I/flutter (12960): Device width:0.0
I/flutter (12960): Device height:0.0
I/flutter (12960): Device pixel density:1.0
I/flutter (12960): Bottom safe zone distance:0.0
I/flutter (12960): Status bar height:0.0px
I/flutter (12960): Ratio of actual width dp to design draft px:0.0
I/flutter (12960): Ratio of actual height dp to design draft px:0.0
I/flutter (12960): The ratio of font and width to the size of the design:0.0
I/flutter (12960): The ratio of  height width to the size of the design:0.0

from flutter_screenutil.

已知
稍后看一下原因

from flutter_screenutil.

我试了一下打开了我的flutter_screenutil项目
在命令行切换到example目录下
然后运行了一下: flutter run --profile
time是打印的当前时间 , 可以看到是极短时间内执行了两次build方法

flutter run --release 

结果也是一样的,
ui上面显示也都是正常的
后面我再看看

之所以打印两次 应该是因为第一次的时候, 系统还没有获取到屏幕参数 ,
后来获取到屏幕参数之后是又运行了一次

from flutter_screenutil.

存在同样的问题.
调试模式一切正常, 打包之后, 发现有个页面文字不显示(用 SU设置了字体大小), 把字体大小改为直接设置就正常了.

from flutter_screenutil.

比较奇怪的是, 我几乎每个页面都用到了SU, 但只有一个页面出问题..

from flutter_screenutil.

为了测试获取屏幕尺寸为0的问题，就进行下面的测试:

我的启动页面，在启动的时候获取不到屏幕的尺寸，跳转到第二个页面才可以获取到屏幕尺寸。（有些机型不会出现这个问题）

原因是打开启动页面时，ScreenUtil 初始化时，获取的屏幕尺寸都是0；在第二个页面，ScreenUtil再次调用初始化函数，这时就可以获取到屏幕的尺寸。

官方的解析是，需要监听页面的屏幕尺寸变化，

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

@OverRide
_MetricsReactorState createState() => _MetricsReactorState();
}

class _MetricsReactorState extends State with WidgetsBindingObserver {
@OverRide
void initState() {
super.initState();
WidgetsBinding.instance.addObserver(this);
}

@OverRide
void dispose() {
WidgetsBinding.instance.removeObserver(this);
super.dispose();
}

Size _lastSize;

@OverRide
void didChangeMetrics() {
setState(() {
_lastSize = WidgetsBinding.instance.window.physicalSize;
// 在这里可以进行屏幕尺寸的初始化

});

}

@OverRide
Widget build(BuildContext context) {
return Text('Current size: $_lastSize');
}
}

from flutter_screenutil.

@hzysunrain 我试过在didChangeMetrics中初始化ScreenUtil , 但是它的触发时间晚于build (在我尝试的几次)
哪怕我在Myapp中的didChangeMetrics都要在home的build方法之后才调用

比较理想的就是在home(一般作为启动页面)中初始化 , 但是不使用ScreenUtil(避免特殊情况拿不到屏幕数据), 在启动页的下一个页面应该就可以直接使用了

from flutter_screenutil.