Some Android phones now have navigation bars at the bottom of the virtual buttons. This design removes physical buttons and further increases the screen share of smartphones.But this sometimes brings some compatibility issues. To prevent the navigation bar from covering the layout, add the "fitSystemWindows=true" attribute to the layout. If you want to listen to the navigation bar hidden and displayed, we can add an empty layout with "match_parent" width and height under the root node of the layout file, add the "fitSystemWindows=true" attribute to the layout, and then listen to the layout. onLayoutChange event, you can listen to the navigation bar.
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