Asked  7 Months ago    Answers:  5   Viewed   24 times

Sometimes it seems that the Name and x:Name attributes are interchangeable.

So, what are the definitive differences between them, and when is it preferable to use one over the other?

Are there any performance or memory implications to using them the wrong way?

 Answers

41

There really is only one name in XAML, the x:Name. A framework, such as WPF, can optionally map one of its properties to XAML's x:Name by using the RuntimeNamePropertyAttribute on the class that designates one of the classes properties as mapping to the x:Name attribute of XAML.

The reason this was done was to allow for frameworks that already have a concept of "Name" at runtime, such as WPF. In WPF, for example, FrameworkElement introduces a Name property.

In general, a class does not need to store the name for x:Name to be useable. All x:Name means to XAML is generate a field to store the value in the code behind class. What the runtime does with that mapping is framework dependent.

So, why are there two ways to do the same thing? The simple answer is because there are two concepts mapped onto one property. WPF wants the name of an element preserved at runtime (which is usable through Bind, among other things) and XAML needs to know what elements you want to be accessible by fields in the code behind class. WPF ties these two together by marking the Name property as an alias of x:Name.

In the future, XAML will have more uses for x:Name, such as allowing you to set properties by referring to other objects by name, but in 3.5 and prior, it is only used to create fields.

Whether you should use one or the other is really a style question, not a technical one. I will leave that to others for a recommendation.

See also AutomationProperties.Name VS x:Name, AutomationProperties.Name is used by accessibility tools and some testing tools.

Tuesday, June 1, 2021
 
Muazam
answered 7 Months ago
31

LinearLayout means you can align views one by one (vertically/ horizontally).

RelativeLayout means based on relation of views from its parents and other views.

ConstraintLayout is similar to a RelativeLayout in that it uses relations to position and size widgets, but has additional flexibility and is easier to use in the Layout Editor.

WebView to load html, static or dynamic pages.

FrameLayout to load child one above another, like cards inside a frame, we can place one above another or anywhere inside the frame.

deprecated - AbsoluteLayout means you have to give exact position where the view should be.

For more information, please check this address https://developer.android.com/guide/topics/ui/declaring-layout#CommonLayouts

Wednesday, June 2, 2021
 
talkhabi
answered 6 Months ago
21

Every time it happend to me i just restarted visual studio, re-built the solution and it worked just fine.. can't say why

Thursday, June 10, 2021
 
xrock
answered 6 Months ago
92

You can use a MultiBinding for it:

   <Window.Resources>
        <local:DictValueConverter x:Key="dictValCnv"/>        
    </Window.Resources>
<TextBlock.Text>
    <MultiBinding Converter="{StaticResource dictValCnv}">
        <Binding Path="MyDictionary"/>
        <Binding RelativeSource="{RelativeSource Self}" Path="Name"/>
    </MultiBinding>
</TextBlock.Text>


using System;
using System.Globalization;
using System.Linq;
using System.Windows.Data;
public class DictValueConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        if (values==null || values.Length<2 )
        {
            return false;
        }

        var dict = values[0] as IDictionary;
        if(dict.Contains(values[1]))
    {
        return dict[values[1]];
    }
        return "KeyNotFound";
    }
    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}
Thursday, August 26, 2021
 
Chris Herrera
answered 3 Months ago
74

The first contains a bundled ADT version of Eclipse.

This is simply a packaging convenience. You are welcome to obtain Eclipse separately and add Android tooling to it.

Android Studio, the second IDE, is based on IntelliJ.

At the present time, this is an early-access preview. IMHO, it is not suited for someone who does not have experience in Android application development.

Apart from these differences I can't get if there is anything that I can do with only one of them

At the present time, Android Studio is an early-access preview, meaning that there are lots of things that it does not have integrated in. Now, by this time next year, and hopefully far sooner, Android Studio will have equivalent or superior integration than does Eclipse with the ADT plugin.

and what's the point of having two distinct official IDEs.

There are an infinite number of "official" tools. You are welcome to use a plain text editor and tools outside of any IDE, for example.

You are welcome to watch the Google I|O 2013 video on developer tools, where they describe a bit of the rationale behind the development of Android Studio.

Thursday, October 7, 2021
 
Zulakis
answered 2 Months ago
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