xml文件和java文件如何在android中相互交互？

Question

I'm learning android about a month. As I study onClickListner and xml's onClick attribute, I got a question.
After I write the code android:onClick="showMap" on xml and "public void showMap(View view)" on java file, the application make a button which can be perform the showMap method.
I could understand the onClickListner control the xml element by id( R.id.somthing ).

How can the showMap method notice the method act as the attribute of the very xml element? I found some other question and it said it can be because of the view parameter, but I'm not convinced perfectly. How do xml and java file interact each other? Please let me know their internal interaction or which the source code do I have to see to understand my question.

Thank you.

ps When I asked to my friend who is good at android, he answered me to find "xml parsing algorithm". But I couldn't find satisfying result.

Answer 1

The xml is parsed a compile time and the corresponding View's object is created, with the attributes you specified. The method you declare in the View's onClick property is managed through reflection. You can take a look to it here

Answer 2

与我们的应用程序捆绑在一起的xml文件（出于性能原因，通过aapt / 2转换为二进制xml），然后在运行时使用LayoutInflater对其进行膨胀。