Develop Reference

Flutter: How to prevent an container overflowing inside a padding

The Problem
I have a card that contains a row of two elements, the second one being a column of two texts. One of the texts can be long, so the column-element itself can overflow.
Coming from CSS, a "width: 100%" would usually be enough here.
What I already tried
I learned you could wrap the column with something like Expanded or Flexible, but it leads the text to become invisible (and the overflow still existing).
I am not sure where exactly I have to put the Flexible/Expanded.
I looked into similar questions and there was always an "Expanded", but I could not apply any of said solutions to my layout so far.
Question
What is the cleanest way to get the outlined box to be only as wide as the padding should allow?
Code
#override
Widget build(BuildContext context) {
return (Card(
child: InkWell(
onTap: () {
print("tab" + name);
},
child: Padding(
padding: const EdgeInsets.all(16),
child: Row(
children: <Widget>[
ClipRRect(
borderRadius: BorderRadius.circular(25),
child: SizedBox(
width: 50,
height: 50,
child: Image(
image: NetworkImage(imageUrl),
),
),
),
Padding(
padding: const EdgeInsets.all(16),
child: Container(
decoration: BoxDecoration(
border: Border.all(width: 1, color: Colors.purpleAccent),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
name,
overflow: TextOverflow.ellipsis,
style: const TextStyle(fontWeight: FontWeight.bold),
textAlign: TextAlign.left,
),
Text(
description,
overflow: TextOverflow.ellipsis,
textAlign: TextAlign.left,
),
],
),
),
),
],
),
),
),
));
}

You can surround the Padding widget inside your Row with an Expanded widget - The child of Expanded will then size itself to the space available.
For some additional context, Rows and Columns are both Flex widgets. Flex widgets layout their children along an axis, and the size of this axis is unbounded by default. Even though the widget "knows" how much space it has available on the display, it doesn't pass that information along to its children, so the children are free to take whatever size they want, which means they can potentially overflow the container.
An Expanded widget can only be placed as a direct child of a Flex widget, and it automatically takes up a given proportion (given by the flex property) of the space available to it (by default that will simply be all of the space which is not taken up by other widgets in the children list).
So essentially, Expanded will take up as much space as the parent widget has available, and then will constrain it's child to be no larger than that (along whichever axis pertains).
The link above to the Flex documentation has more info.

Flutter Safe Area issue

I am developing an app where I need to use the safe area to avoid unnecessary swiping. Though I have implemented the safe area in a custom container to render the screens, it leaves a white margin on top.
When I add these parameters to the SafeArea() widget,
top: false,
maintainBottomViewPadding: true,
the white space goes away. However, the size of the app bar is too big. This is the minimal code
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
class DashboardActivity extends StatefulWidget {
#override
_DashboardActivityState createState() => _DashboardActivityState();
}
class _DashboardActivityState extends State<DashboardActivity> {
#override
Widget build(BuildContext context) {
return SafeArea(
//top: false,
//maintainBottomViewPadding: true,
child: Scaffold(
backgroundColor: Colors.white,
resizeToAvoidBottomInset: true,
appBar: CupertinoNavigationBar(
backgroundColor: Colors.grey,
leading: InkWell(
child: Icon(
Icons.arrow_back_ios,
color: Colors.white,
),
onTap: () => Navigator.pop(context),
),
middle: Text(
"Dashboard",
),
),
body: Text(
'This is an example use of SafeArea',
),
),
);
}
}
This only happens on tall displays, i.e. something more than an 18:9 aspect ratio.
Can someone tell me what's wrong and how can I fix this?

SafeArea is basically the same Padding widget. The difference is it adds padding to its child widget when it is necessary (For example, it will indent the child by enough to avoid the status bar at the top of the screen).
The reason why it is working on smaller screens is that SafeArea doesn't add any padding there (it is like to have something like this padding: EdgeInsets.symmetric(vertical: 0))
When you are wrapping your Scaffold inside SafeArea on taller screens it is calculating necessary padding value and adding it to Scaffold.
This is why you are getting this:
The correct use case of SafeArea is to use it inside body:.
Flutter AppBar and CupertinoAppBar widgets is handling device screen types by themselves.

Flutter, Android and IOS bottom navigation bar size is different

An overflow error occurred due to the bottom navigation bar height in ios, the layout that worked well on all Android devices.
It seemed to be because of the extra space because of the format of turning off the app by pulling it up from the bottom, which is governed by the IOS operating system.
it is super annoying I forcibly increased the bottom navigation bar height because of IOS, but the design is now bad in Android. Anyone know how to solve it?
--UPDATE
Scaffold(
bottomNavigationBar: Container(
height: 50,
child: BottomNavigationBar(
...
),
),
)

Try add SafeArea on top of Container :
Scaffold(
bottomNavigationBar: SafeArea(
child: Container(
height: 50,
child: BottomNavigationBar(
...
),
),
),
)

You can easily make height different for both platforms:
height: Platform.isIOS ? 50:40
So here if the Platform is IOS the height will be 50 or it will be 40.

Hey i tried custom painter and i realized that for iphone 13 the height is 90 pixel for bottom navigation bar and for android the height is different which is the value of kBottomNavigationBarHeight. So i declared this value in my constant file such as double btmNavigationBarHeight = Platform.isAndroid ? kBottomNavigationBarHeight : 90;. Hope it helps anyone with the same problem

Using Align inside of ListView to align Widgets left/right

My application shows profile of users. A feature I wish to add is to allow "like"ing of profiles by users. For this, I am using a Listview to show all profile content.
The problem is when adding a LikeButton, it gets centered, which is expected. I want to move it to the (top) right.
Align appears like a more viable and elegant solution that doing something like this (see below) but I cannot get Align it to work (it remains centered).
ListView(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [LikeButton()],
),
// rest of profile information
Using a Container with width: double.infinity doesn't work with Align either - it remains centered.
Container(
width: double.infinity,
child: Align(
alignment: Alignment.topRight,
child: LikeButton(),
),
)
Is using a Row my only option or is there a better way?

Since LikeButton is a Row or Column it self, You can't Align it like that,
You can use its properties to align it
ListView(
children: [
LikeButton(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.start,
)
],
)
or just wrap it inside a SizedBox and align that box
Container(
width: double.infinity,
height: 500,
alignment: Alignment.topRight,
child: SizedBox(
width: 100,
height: 100,
child: LikeButton()),
)
Row takes the size of its children so your first code won't align it vertically
You didn't give height in you're Container code so Aligning it by topRight would be meaningless

You can Stack the LikeButton() onto Container(child:Row()) and position it to top right by giving values to topRight parameters.

Flutter Overflow Pixel issue

This is from London App Brewery completed Flutter project "BMI Calculator": https://github.com/londonappbrewery/BMI-Calculator-Flutter-Completed.git
I'm not sure if caused by my outdated android phone or the android screen is too small, but I'm getting Bottom Overflow Pixels For example, the top two cards have an error message of Bottom Overflow by 19 Pixels, the center card has an error of Bottom Overflowed by 60 pixels, and bottom two cards have an error of Bottom Overflowed by 56 pixels.
Additionally, if I rotate my phone to 90 degrees, the card image size decreases dramatically, as you can see from the second image.
Please help me fix this.
Thank you
class _InputPageState extends State<InputPage {
#override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomPadding: false,
appBar: AppBar(
title: Text('BMI CALCULATOR'),
),
body: Column(
children: <Widget[
Expanded(
child: Row(
children: <Widget[
Expanded(
child: ReusableCard(
colour: colorCode,
cardChild: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget[
Icon(
FontAwesomeIcons.mars,
size: 20.0,
),
SizedBox(
height: 5.0,
),
Text(
'MALE',
style: TextStyle(
fontSize: 10.0,
color: Color(0xFF8D8E98),
),
)
],
),
),
)]),),
]));
}
}

This is happening because your UI takes up too much space for your phone! You have two options to solve this.
Either you wrap your overflowing widgets in a scrolling widget, like SingleChildScrollView, this will let you scroll the Widget if it is too large.
Or you calculate the size of the widget based on device size. You can do that by using the MediaQuery class:
MediaQuery.of(context).size.height Can be used to get device height for instance.
Have a look at this article if you want to go down that path. https://medium.com/tagmalogic/widgets-sizes-relative-to-screen-size-in-flutter-using-mediaquery-3f283afc64d6
Of course you could also just reduce the size of your Widgets so it fits on your device. Thats fine for Tutorial purposes, but if you actually want to publish an App, go with the MediaQueryapproach.
Good luck!