android - How to get more zoom from mupdf -

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I have implemented mupdf for my Android application. This is working fine, but I need to zoom more. I tried to override the double-tape method, but it did not work. How to implement more zoom feature?

I'am not sure, but I think the field "mScale = 1.0f" ReaderView. In java there is a key for quick testing, increase it slightly and see what happens, e.g. To 1.2f

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