rootView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
最后我们将更新我们的主题，以便我们有一个半透明的导航栏，带有黑色图标：
<style name="AppTheme" parent="Theme.MaterialComponents.Light">
<!-- Set the navigation bar to 50% translucent white -->
<item name="android:navigationBarColor">#80FFFFFF</item>
<!-- Since the nav bar is white, we will use dark icons -->
<item name="android:windowLightNavigationBar">true</item>
</style>
// Keep a record of the intended bottom padding of the view
val bottomNavBottomPadding = bottomNav.paddingBottom
bottomNav.setOnApplyWindowInsetsListener { view, insets ->
// We've got some insets, set the bottom padding to be the// original value + the inset value
view.updatePadding(
bottom = bottomNavBottomPadding + insets.systemWindowInsetBottom
insets
fun View.doOnApplyWindowInsets(f: (View, WindowInsets, InitialPadding) -> Unit) {
// Create a snapshot of the view's padding state
val initialPadding = recordInitialPaddingForView(this)
// Set an actual OnApplyWindowInsetsListener which proxies to the given// lambda, also passing in the original padding state
setOnApplyWindowInsetsListener { v, insets ->
f(v, insets, initialPadding)
// Always return the insets, so that children can also use them
insets
// request some insets
requestApplyInsetsWhenAttached()
data classInitialPadding(valleft: Int, valtop: Int,
valright: Int, valbottom: Int)
privatefunrecordInitialPaddingForView(view: View) = InitialPadding(
view.paddingLeft, view.paddingTop, view.paddingRight, view.paddingBottom)
当我们需要一个视图来处理insets时，我们现在可以执行以下操作：
bottomNav.doOnApplyWindowInsets { view, insets, padding ->
// padding contains the original padding values after inflation
view.updatePadding(
bottom = padding.bottom + insets.systemWindowInsetBottom
fun View.requestApplyInsetsWhenAttached() {
if (isAttachedToWindow) {
// We're already attached, just request as normal
requestApplyInsets()
} else {
// We're not attached to the hierarchy, add a listener to// request when we are
addOnAttachStateChangeListener(object : OnAttachStateChangeListener {
override fun onViewAttachedToWindow(v: View) {
v.removeOnAttachStateChangeListener(this)
v.requestApplyInsets()
override fun onViewDetachedFromWindow(v: View) = Unit
