Develop Reference

Which android view should be used to display a jetbrains.letsPlot() + geomHistogram() -object?

I am having some trouble including a Plot-object (produced by jetbrains.letsPlot() + geomHistogram()) within the activity.xml for a Kotlin Android app. I am familiar with basic activity elements but I don't know which one to use in this case and I can not figure it out using https://github.com/JetBrains/lets-plot.
Any help is very appreciated!

You can use Android' WebView to display a plot.
jetbrains.letsPlot() + geomHistogram() produces a Figure object.
First you will have to convert it to a simple Map object using toSpec() method:
val spec = when (plot) {
is Plot -> plot.toSpec()
else -> (plot as GGBunch).toSpec()
}
Next, you will generate a string (plot HTML representation) using PlotHtmlHelper:
val html = PlotHtmlHelper.getStaticDisplayHtmlForRawSpec(spec)
This way you can generate a web page and load it to WebView. The page should also contain a script tag for loading the Lets-Plot JS library.
The code could look similar to this (but with a newer library version - 2.2.1 currently): https://github.com/JetBrains/lets-plot-kotlin/blob/master/demo/browser/src/main/kotlin/frontendContextDemo/BrowserDemoFrontendContext.kt
If you are using Kotlin/JS you may want to take a look at this example as well: https://github.com/alshan/lets-plot-mini-apps/blob/main/js-ir-frontend-app/src/main/kotlin/Main.kt

Insert icon in a tabbed page(Android) on xamarin form

I'm new to StackOverflow community!
I need help with one problem with android in Xamarin Forms. To be precise... I tried with some friends to build our first app. We choose(with the help of our University professor) Xamarin for the cross-platform development of Android and iOS for both systems using the Xamarin Forms. I created the interface part of the app and now I am stuck in a fort with big walls. When I try to add a Tabbed Page the icon for the functional bar, the app crashes(Android) but in iOS, the problem doesn't appear...
I'd try with some solution... like :
-Render in the NameApp.Droid adds different renderer only for the android part but no result...
-Try another way to insert the icon in the .xaml file directly but no result...
-Try to follow another way to modify the .axam file for the "Theme" part
but no result...
I want to integrate all the stuff on time only in the "Main Project". I don't want for now touch the "nameProject.Droid" or "nameProject.iOS" part, But try to make in one shoot both(Andriod & iOS). I've found a different bug in Android (è.é) but for this, I am going crazy...
But I need to modify the ".Droid" no problem I accept the challenge!
This is the result I aspire to create.
"https://storage.googleapis.com/material-design/publish/material_v_12/assets/0B6Okdz75tqQsbHJuWi04N0ZIc0E/components-tabs-usage-mobile7.png"
This is the way I add the Icon in the Tabbed Page. An assumption I add all the stuff in the "Resource" in ".Droid" and ".iOS :
var MainPageTabbed = new MPageTabbed();
var Profile = new Profile();
var ListChat = new ListChat();
if (Device.RuntimePlatform == Device.Android)
{
MainPageTabbed.Icon = "ldpi.png";
Profile.Icon = "ldpi2.png";
Chat.Icon = "ldpi1.png";
}
if (Device.RuntimePlatform == Device.iOS)
{
MainPageTabbed.Icon = "ldpi.png";
Profile.Icon = "ldpi2.png";
ListChat.Icon = "ldpi1.png";
}
NavigationPage.SetHasNavigationBar(this, false);
Children.Add(MainPageTabbed);
Children.Add(Profile);
Children.Add(ListChat);
Someone can help me please to find a solution?

Here you have an example of how to use the TabbedPage in xamarin forms:
https://developer.xamarin.com/guides/xamarin-forms/application-fundamentals/navigation/tabbed-page/
... Xamarin.forms renders Android tabbed-pages as something called a viewpager combined with a TabPagerStrib, and it looks like the example in the link above.
You might read about BottomNavigationBar for Android instead, or look at this link for a TabPagerStrip with an image:
https://forums.xamarin.com/discussion/39937/adding-icons-to-a-pagertabstrip-instead-of-text

If anyone is interested in a FontAwesome custom icon implementation I followed this tutorial to begin with: FontAwesome with Xamarin Forms
Unfortunately he doesn't give an example of integrating with tabbed pages but after some experimenting I finally figured out a simplified Xaml way to render it without a custom tabbed renderer:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:IBMobile.Views"
xmlns:local2="clr-namespace:FontAwesome"
x:Class="IBMobile.Views.HomePage"
Visual="Material">
<ContentPage.IconImageSource>
<FontImageSource FontFamily="{StaticResource FontAwesomeSolid}" Glyph="{x:Static local2:IconFont.Home}" />
</ContentPage.IconImageSource>

Iconize Xamarin with Fontawesome

I'm new to Xamarin and I'm trying to use the Iconize NuGet package for Xamarin, but I'm not having much luck. At the moment I'm working with a simple Android app. I've installed Iconize per the instructions and, save for an error on the line:
FormsPlugin.Iconize.Droid.IconControls.Init(Resource.Id.toolbar, Resource.Id.tabs);
(the compiler didn't like the Resource.Id.toolbar or Resource.Id.tabs so I removed it) everything compiles and runs. However, when I try to add an IconButton with a Fontawesome image, I get "System.NullReferenceException: Object reference not set to an instance of an object." error that points back to
the line LoadApplication( new App() ); in the MainActivity.cs.
I'm trying to add the IconButton to a grid in code (not XAML) using
grid.Children.Add( new IconButton
{
Image = "fa-info-circle"
}, 3, 2 );
Any ideas on how to make this work? The examples on the Iconize page haven't been very useful and I haven't found any examples on Google.

Okay I finally found something that was useful. I found a clue on this page and some other information on the project issues page on Github.
Ultimately, to get the icon to display I used
grid.Children.Add( new IconButton
{
Text = "fa-info-circle",
}, 3, 2 );
It was the Text property and not the Image property that I should have used.
Hope this helpful to someone else.

Show image in TImage dynamically (at run time) without opendialog in c++ builder xe8

I want to show image (png,jpg etc) in dynamically created (as per requirement and fully through coding) TImage component, at runtime in C++ builder xe8 (not delphi). But I dont want to use opendialogbox (suggested in many web sites). I want to run this app on my android device. I tried to use LoadFromFile(), it crashes the app on android, but when I run this on windows, its running smoothly. I am just a beginner to c++ builder. So guys pls help. Thanx in advance for any kind of help.Here is what I did.
void __fastcall TForm1::TForm1(TComponent* Owner)
{
TImage* img = new TImage(this);
img->Parent = this;
img->Bitmap->LoadFromFile("D:\\res\\profile.png");
}

Did you see what is the error?
If you run the program with the provided by you code I assume the error would be that the file is not found, because there is no such directory "D:\" in android.
One way to set the path is to write a static path which points to your image. For example : "/storage/sdcard0/DCIM/Camera/MyImage.jpg";
The second way is to include the <System.IOUtils.hpp> header and to use some built-in functions like:
System::Ioutils::TPath::GetPicturesPath();
System::Ioutils::TPath::GetAlarmsPath();
You can check them out, they might be useful.

Appcelerator Alloy Android -Cannot add window/tabGroup to another window/tabGroup

I have an app which works in IOS 6. I am trying to get it to work on basically any andriod version.
I have an index controller and view which load fine.
I can load the register page but when I bypass the register page. It works fine in IOS but not Android. I am not using tabgroups just windows.
Any ideas ? NOTE I can't get the full xml tags to load in code view which is why there are no brackets.
I get this error:
new Error("Cannot add window/tabGroup to another window/tabGroup.");
Index Controller
if (!isRegistered) {
var register = Alloy.createController( 'register' );
register.getView().open();
}
else {
var main = Alloy.createController( 'main' );
Alloy.Globals.mainController = main;
}
index view
Alloy
Window id="index"
Require type="view" src="slider" id="slider"
Window
Alloy
main js controller
// code above
$.main.open();
// code below
main view
Alloy
Window id="index"
View id="loadingOverlay" /
View id="main"
ImageView id="background" image="/images/background.jpg"/
Require type="view" src="slider" id="slider" /
/OptionDialog
/View
/Window
/Alloy
Thanks,

the error messag explains it
new Error("Cannot add window/tabGroup to another window/tabGroup.");
hard to tell what is going on here, you might need to add a gist or pastebin, but a window cannot contain another window