How to change Xamarin Android/IOS Application Name ?

Right click on your project-Android -> Options -> Android Application ->  Change application name.  Then rebuild

If it didn't change then go to MainActivity.cs

[Activity(Label = "ProjectName", Icon = "@mipmap/iconname", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]


IOS:
Go open info.plist then change Application name


Rebuild- then Run again 

How to change app icon from Xamarin's pre-made app icon to your app icon?

I've read a lot of tutorials on how to change the image to my app icon. Others said put the images in all drawables folders.  So I did that and the image is blurry.  I read that drawables are for images used in application and mipmaps are for launcher icon(it is the app's icon image). I copied the image to all mipmaps and still blurry.  So then I read to delete and mipmap folder with v26 on it. I deleted it and now the app icon is not blurry.

Trying to ouput in pdf what i have in listview

This is what i have in listview from post.cs

It is making me a new list

What i want in PDF

Setting time format

https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings

https://stackoverflow.com/questions/57166239/xamarin-how-to-display-current-date-and-time-on-a-label-how-to-access-the-cloc

https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings

if you want a constantly updating time, use a Timer

System.Timers.Timer timer = new System.Timers.Timer(1000);
timer.Elapsed += TimerElapsed;
timer.AutoReset = true;
timer.Start();

private void TimerElapsed(Object source, ElapsedEventArgs e)
{
    myLabel.Text = e.SignalTime.ToString();
}

if you want to use databinding, have your elapsed event update the ViewModel property that your label is bound to instead of directly updating the Label

• 
  If you type string currentDate = DateTime.Now.ToString()
• 


Picker on IOS kept updating list when DONE is not pressed.

on the .cs file where the pickers are you must include this.
using Xamarin.Forms.PlatformConfiguration;
using Xamarin.Forms.PlatformConfiguration.iOSSpecific;
then use this on the picker you want to use. nameofpickerinxamlfile.On<iOS>().SetUpdateMode(UpdateMode.WhenFinished);

so now...the list will only get updated when the done button is pressed.
therefore the list are safe.


https://docs.microsoft.com/en-us/xamarin/xamarin-forms/platform/ios/picker-selection

https://forums.xamarin.com/discussion/57793/picker-firing-event-selectedindexchanged-on-ios-too-early

https://stackoverflow.com/questions/56388534/xamarin-is-there-a-way-to-update-list-on-picker-when-user-changes-its-mind/56398643?noredirect=1#comment99454685_56398643

https://forums.xamarin.com/discussion/57793/picker-firing-event-selectedindexchanged-on-ios-too-early

https://blog.pieeatingninjas.be/2017/07/06/bind-to-xamarin-picker-but-only-update-value-after-hitting-done-on-ios/

If Previewer not showing

Right click on .Android solution- Options-Androidapplication-then make sure minimum target coincides with SDK manager installed under Tools.

Grid Layout

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/layouts/