Develop Reference

MAUI WebView small resolution on Android

I'm developing a simple webapp with Xamarin/MAUI.
If I build it on iOS it works fine, but on Android (both emulator and two different devices) the page content is displayed as if the screen was 400px.
If I remove <meta name="viewport" content="width=device-width, maximum-scale=0.5, initial-scale=0.5, user-scalable=no"> from the header of my website it's technically correct, but not as I intended.
Is there a way to maintain the header and display the page correctly on Android?
Thanks!

resolution issue in cordova android app

I am using cordova with jquery mobile for one android app.
For Viewport meta tag i am using below code
<meta name="viewport" content="width=device-width,
initial-scale=1.0;maximum-scale=1.0;user-scalable=0; target-densitydpi=device-dpi">
With older jquery mobile version it was returning actual height and width of device but when i have upgraded jquery mobile to 1.4.5 and cordova to 5.0 then it is returning some different resolution with window.innerHeight and window.innerWidth
Based on this resolution i am taking css files with media query
Please help me with this
Regards,
Bindal

My current workaround:
In index.html: <meta name="viewport" content="user-scalable=no, initial-scale=0.5, minimum-scale=0.5, maximum-scale=0.5, width=device-width, viewport-fit=cover">
In index.css the "body" part, add: transform-origin: 0px 0px; transform: scale(0.5);
window.innerHeight and window.innerWidth has the native resolution.
But haven't run test if one pixel is one pixel. Also I don't have enough device to test if it works across different device and different version of android.

With this mets it works for me, try it
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">

Media queries are the wrong approach for several reasons:
you will not get an exact match for your screen, proportional layout is for some elements impossible
You will not be able to target Android 4.0+. Quad-HD and older devices use the same proportion with different -device-pixel-ratio factors. Factors are interpreted differently through Android versions, so some displays will be messed up
media queries are intended to supply DIFFERENT visuals for different resolutions, not the same visual scaled across resolutions
I recommend using https://github.com/biodiv/cordova-anyscreen (and drop jquery mobile). It will also give you the correct display and available resolution as app.deviceWidth, app.deviceHeight and app.containerWidth etc.

Mobile website does not zoom on Safari in landscape mode

I have browsed through many topics here and on the web, trying to solve my issue. I'm very close to finding a solution but there is one thing that is still not working correctly.
I have a mobile website that is 640px wide. It should:
Show zoomed in on all browsers correctly, also when changing the orientation of your device
User should not be able to zoom in (input fields neither).
I have used this viewport meta tag to accomplish this:
< meta name="viewport" content="width=640,maximum-scale=0.5,initial-scale=0.5, minimum-scale=0.5" />
This works great on Android, both portrait and landscape. It works great on iOs on portrait too, but it shows the site zoomed out on landscape, so it's not adapting to the width of the phone, but keeps the original portrait size. I have tested this on iPhone 5 and iPhone 4S.
I have found mostly issues with responsive websites and not so many with fixed mobile websites. Is there a solution for my problem by changing the viewport meta tag? Or should I be looking into javascript to solve this?
Thanks in advance.
Edit:If anyone is interested, I used this bit of code in Coldfusion which is working perfectly fine now (iOs & Android):
<cfif findNoCase('iPhone', cgi.http_user_agent,1)><meta name="viewport" content="width=640" /><cfelse><meta name="viewport" content="width=640,maximum-scale=0.5,initial-scale=0.5, minimum-scale=0.5" /></cfif>

I tend to use those lines in my head to optimize responsive sites:
<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="cleartype" content="on">
Maybe adding those will fix your problem?
I know from experience, that iOS Safari behaves strange in some cases. Here is a line that I use to fix some other issues I had with it before:
<!-- This script prevents links from opening in Mobile Safari. https://gist.github.com/1042026 -->
<!--
<script>(function(a,b,c){if(c in b&&b[c]){var d,e=a.location,f=/^(a|html)$/i;a.addEventListener("click",function(a){d=a.target;while(!f.test(d.nodeName))d=d.parentNode;"href"in d&&(d.href.indexOf("http")||~d.href.indexOf(e.host))&&(a.preventDefault(),e.href=d.href)},!1)}})(document,window.navigator,"standalone")</script>
-->
Alternatively you can try running your site as iOS Web-app:
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="">
Hope that some of that will fix your problem:)

How can I enable zoom on Android?

That's right, I want to enable zooming rather than disabling it.
I have created a responsive website and all is looking good. However for some reason you can't pinch-zoom in Chrome on a Nexus 7 (running Android 4.2.2).
This is my meta tag that makes sure it shows the site with the right CSS for the screen size:
<meta name="viewport" content="width=device-width, initial-scale=1" />
Nowhere here do I say the user can't zoom. As I say, the site is responsive so there is no reason for the user to need to zoom, however if a user wants to zoom I don't want to stop them. There is no problem on the iPhone, the user can zoom if they want to. But on Android they can't. I have tried adding user-scalable=yes and user-scalable=1 but this makes no difference.
The only thing that works is removing that meta tag but then the site renders itself as if it's being displayed on a large screen so it is no longer responsive.
Is there anything I can do?

#David Lee's comment on top is correct: It seems more of a Nexus 7 thing than a Chrome problem. Google has had a lot of complaints regarding pinch-to-zoom wrt Nexus 7 and there is speculation that they are trying to work around Apple's pinch to zoom patent.
From what I know just using
<meta name="viewport" content="width=device-width, initial-scale=1">
should work.
I've looked at http://m.skyscanner.com/ as an example and it works on other devices with chrome and other browsers like Dolphin HD. And all that site has is the viewport code from above.
Chrome for Android has a way for us to force zoom - Open up the browser's main settings and tap "Accessibility," then check the option called Force enable zoom and see if this works in Nexus 7(I dont have that device so cant test it)

What version of Android? Android 2.2 doesn't support the viewport meta-tag, if your version is between 2.3.x and 4.x try this:
<meta name="viewport" content="initial-scale=1.0, width=device-width, user-scalable=yes" />
Hope this helps.

Although it is not a complete solution to your problem, but it can zoom a particular region.
Thierry B wrote a plugin that will do this and posted it on github repo
You can demo it here:
Just click on the part you want to zoom
Or for Viewport Zoom please refer to this tutorial

use this hope it will help:
<meta name="viewport" content="initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,width=device-width,height=device-height,target-densitydpi=device-dpi,user-scalable=yes" />

The last parameter below: user-scalable = 1:
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, user-scalable=1" />

Disable pinch/zoom in Android 2.1 browser on HTC devices

I'm building a mobile site and have the following meta tag set in the header:
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
Unfortunately, this isn't working on HTC devices (HTC Hero, etc) with Android 2.1. Any ideas on how I can disable pinch-to-zoom in this browser? Works fine on the iPhone.

I have contacted HTC about this issue and they have informed me that they don't have support for the viewport meta tag at all and there is no other way to disable zoom.
Quite disappointing.

This works on the default android and iPhone browsers. Although sadly it doesn't work for HTC's custom browser (as asked).
<meta content='True' name='HandheldFriendly' />
<meta content='width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;' name='viewport' />
<meta name="viewport" content="width=device-width" />

Just an idea, maybe not useful (not tested) :
Did you look into javascript support in Android's WebView? I think you might be able to call WebSettings.setBuiltInZoomControls(false); which might do what you need.

I've also played with this a LOT, and found no combination that actually disables the zoom.
You can however set the initial scale of the page, so when the user access it, it is in the correct zoom level.
The default zoom level for android browsers is "medium", but as mentioned, if the user changes this in settings (or pinch zooms), it will not be prevented.