来源 http://hukai.me/android-training-course-in-chinese/ui/system-ui/visibility.html
本节课将教你如果注册监听器来监听系统UI可见性的变化。这个方法在将系统栏与你自己的UI控件进行同步操作时很有用。
注册监听器
为了获取系统UI可见性变化的通知，我们需要对View注册View.OnSystemUiVisibilityChangeListener监听器。通常上来说，这个View是用来控制导航的可见性的。
例如你可以添加如下代码在onCreate中
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View decorView = getWindow().getDecorView();
decorView.setOnSystemUiVisibilityChangeListener
(
new
View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
// Note that system bars will only be "visible" if none of the
// LOW_PROFILE, HIDE_NAVIGATION, or FULLSCREEN flags are set.
if
((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
// TODO: The system bars are visible. Make any desired
// adjustments to your UI, such as showing the action bar or
// other navigational controls.
}
else
{
// TODO: The system bars are NOT visible. Make any desired
// adjustments to your UI, such as hiding the action bar or
// other navigational controls.
}
}
});
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