After Android updates the ADT, the old project cannot display graphical layout.

I started working on Android these days. Because I haven't used eclipse for a long time, I updated the latest ADT when I started it. After the update, I found that the previous project could not display graphical layout, and I was overwhelmed, after querying a lot of information, the problem was not solved. It was confusing all morning and finally solved the problem by changing the XML opening method: Right-click the XML file to be opened, in the dialog box that appears, select Android layout editor and you will be able to see your graphical layout.

Hope to solve your problems and save valuable development time.