An Activity and xml problem

            
When I first build a project, it will automatically generate an xml file, but when my second time to create a new class, how would not generate the corresponding xml file in the layout, and the corresponding xml and class files are generated automatically or manually build? ? ?
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Online ah

Seeking answers to a haste
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A class can correspond to a layout, but not required, many can also be used directly to generate xml code.
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The landlord can not rely too IDE ah! The IDE to help you create a build of a class can be for more than one layout, you can only correspond to a layout, see usage scenarios, in general, the best build-it-yourself layout, it helps to understand, not too rely on IDE tools to help you build, unless you are already familiar with the
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reference to the second floor tcmakebest reply:

a class can correspond to a layout, but not required, many can also be used to generate code directly xml .

Thank you, friends, or yourself Well
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reference to the third floor ncepu307 reply:

landlord, not too rely on IDE ah! The IDE to help you create a build of a class can be for more than one layout, you can only correspond to a layout, see usage scenarios, in general, the best build-it-yourself layout, it helps to understand, not too rely on IDE tools to help you build, unless you are already familiar with the

Grace decided to do it yourself!