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並前往https://newbedev.com/android-why-setvisibility-view-gone-or-setvisibility-view-invisible-do-not-work

or setVisibility(View.INVISIBLE); do not work | Newbedev

For starters, you don't have your magic button defined and there is no event handler for it. Also you shouldn't use: dp2.setVisibility(View.GONE); dp2.

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