XML tags identify the data and are used to store and organize the data, rather than specifying how to display it like HTML tags, which are used to display the data. More than just a markup language, XML is a metalanguage — a language used to define new markup languages. Android Studio is a must have for both the beginner and experienced Android developer.
Well well it should be noted that whether any technology is used in certain IDE it would be good to have some background knowledge or at least know what is it for.. Overall is not hard to learn XML at a functional level. Just about every browser can open an XML file. In Chrome, just open a new tab and drag the XML file over. When you do, the file will open in a new tab.
Same as why is silverlight with xml the answer is simple xml give power by integration and scalability. Sorry my english. One possible reason is that you need not have any working java underneath in order to be able to see the visual layout of the interface you are working on.
If this were a source file you would have to either carefully parse it or compile and run it all of which are more complex than parsing xml. Xml as itself is well readable both by human and machine. Also, it is scalable and simple to develop. Also, you have already mentioned the decoupling. As for R. The solution is rather good, as it is using ints instead of string to use less memory and in the same time provides well readable names for the simplicity of development.
Android Layouts are tree like structures with some enforced rules. XMLs are perfect fit for this purpose. Meaning XML is based on the idea that documents have structural and other semantic elements that can be described without reference to how such elements should be displayed.
The actual display of such a document may vary, depending on the output medium and style preferences. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. See this thread. Another example of a markup language is HTML, which defines the appearance of a website. HTML places the images and text on a website and sets the font and color.
Though just to complicate matters, JavaScript is technically a scripting language! Consider the following example given by IBM Developer :. Here, you and I know the information is an address, but all the browser or computer knows is where to start new lines.
XML is used anywhere that can benefit from adding context to data. It is used across the web to make search smarter and simplify data exchange. XML performs the same function in Android app development: describing data and introducing elements. Specifically, XML sets the layout of things like buttons and images, and defines the font, color, and any text that shows by default. To make those buttons actually do anything, you will need to use a programming language like Java or Kotlin, though.
When you create a new project in Android Studio, you will be greeted by a hierarchy of different files and folders, which can be a little daunting for complete beginners.
You just need to concentrate on two files for now: MainActivity. To make life just a little simpler, Android Studio normally opens both these files as soon as it boots up. Read more: Understanding Java syntax. You can assign any XML file to any Java file with this, and you can create as many of both as you like. However, by default MainActivity.
To recap, XML describes the views in your activities, and Java tells them how to behave. To make changes to the layout of your app then, you have two main options. Build apps that encompass pre-installed features on the device. More than just a markup language, XML is a metalanguage — a language used to define new markup languages.
Well well it should be noted that whether any technology is used in certain IDE it would be good to have some background knowledge or at least know what is it for.. Overall is not hard to learn XML at a functional level. XML still lives today, mainly because it is platform agnostic.
It supports Unicode and is often used as part of a data presentation workflow. Those layouts will adapt to different screen sizes, whereas AbsoluteLayout will not. I always go for LinearLayout over all other layout.
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