android define id in xml

How do I reference an Android resource id?
There are a number of other ID resources that are offered by the Android framework. When referencing an Android resource ID, you do not need the plus-symbol, but must add the android package namespace, like so: @+id is used to create an id for a view in R.java file. @id is used to refer the id created for the view in R.java file.
How XML layout ID is used in Android?
In Android, when dealing with XML layouts, we come across the ID attribute in the View or Layout tags. From the beginning, we learn that it will assign or refer the id of this View/Layout. However, you might have noticed that they are different variations: So in what cases are they used?
What is an ID in XML?
Note: An ID is a simple resource that is referenced using the value provided in the name attribute, not the name of the XML file. As such, you can combine ID resources with other simple resources in one XML file, under one element.
What is a plus sign in Android xml?
TL;DR: The plus sign in “@+id/” tells Android build tools that you are declaring a new resource. And if it does not exist, add to R.java file. But basically, you don’t have to think, just use “@+id/” anywhere you want! In Android, when dealing with XML layouts, we come across the ID attribute in the View or Layout tags.

ID Resources

ID resource is a simple resource defined in XML that provides a unique identifier for other project resources. An ID resource does not always reference an actual resource item, it is simply a unique ID that you can attach to other project resources or use as a unique integer in your app. proandroiddev.com

Are There Any Exceptions?

Yes, if you write a function anywhere in Java file, you can call it, regardless of the order. The difference is that in XML the layout will parse from top-down, so the code below will fail to compile because it can’t find an existing R.id.check. In this case, we have two solutions. Firstly, bring the Button tag with id/start under Button with id/ch

Conclusion

If simplicity is what you like, just use @+id/anywhere you want. But it is always good to learn something new, right? The choice is yours Happy coding~ proandroiddev.com

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