Set column width in jitter - set column width in jitter

problem ：

I need to set a Column width in flutter, I have to do a layout with 3 sections, one should be 20% of the screen, the other one 60% and the last one 20%. I need to flutter Set a column width in , I have to make a containing 3 The layout of the three parts , One should be a screen 20%, The other is 60%, The last one is 20%.I know that those 3 columns should be into a row, but I don't know a way to set the size, when I do that, the 3 columns take the same size. I know that 3 The columns should line up , But I don't know how to set the size , When I do this ,3 Same size of columns .

I will appreciate any feedback. I would appreciate any feedback .

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Solution ：

Reference resources ： https://stackoom.com/en/question/3ZTXs