处理视图可见性更改而不会覆盖视图 [英] Handle a view visibility change without overriding the view

问题描述

是否可以在不覆盖视图的情况下处理视图可见性更改(例如，从GONE更改为VISIBLE)?

Is there a way to handle a view visibility change (say, from GONE to VISIBLE) without overriding the view?

像View.setOnVisibilityChangeListener();一样?

推荐答案

您可以使用GlobalLayoutListener确定视图可见性是否发生任何变化.

You can use a GlobalLayoutListener to determine if there are any changes in the views visibility.

myView.setTag(myView.getVisibility());
myView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        int newVis = myView.getVisibility();
        if((int)myView.getTag() != newVis)
        {
            myView.setTag(myView.getVisibility());
            //visibility has changed
        }
    }
});

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