WindowInsets Handling & Keyboard Animations

Jul 20 2021 · Kotlin 1.5.10, Android 11, Android Studio 4.1.3 and Android Studio Arctic Fox Canary 12

Part 1: Keyboard Handling in Android

06. Animate Surrounding Views

Episode complete

Play next episode

Next
About this episode
Leave a rating/review
See forum comments
Cinema mode Mark complete Download course materials
Previous episode: 05. Animate the Keyboard Next episode: 07. Read the Keyboard Visibility

Get immediate access to this and 4,000+ other videos and books.

Take your career further with a Kodeco Personal Plan. With unlimited access to over 40+ books and 4,000+ professional videos in a single subscription, it's simply the best investment you can make in your development career.

Learn more Already a subscriber? Sign in.

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

Now that the keyboard is beautifully synchronized with the views, let’s see how interacting with the surrounding views can also modify the keyboard visibility.

@RequiresApi(Build.VERSION_CODES.R)
fun createLinearLayoutManager(context: Context, view: View): LinearLayoutManager {
  var scrolledY = 0
  var scrollToOpenKeyboard = false
 
  return object : LinearLayoutManager(context) {
    var visible = false
  }
}

override fun onScrollStateChanged(state: Int) {
  if (state == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {

    visible = view.rootWindowInsets?.isVisible(WindowInsetsCompat.Type.ime()) == true

    if (visible) {
      scrolledY = view.rootWindowInsets?.getInsets(WindowInsetsCompat.Type.ime())!!.bottom
    }

    createWindowInsetsAnimation()

  } else if (state == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
    scrolledY = 0
    animationController?.finish(scrollToOpenKeyboard)
  }

  super.onScrollStateChanged(state)
}

override fun scrollVerticallyBy(dy: Int, recycler: Recycler, state: State): Int {

  scrollToOpenKeyboard = scrolledY < scrolledY + dy

  scrolledY += dy

  val navBar = view.rootWindowInsets?.getInsets(WindowInsetsCompat.Type.navigationBars())!!

  if (scrolledY < navBar.bottom) {
    scrolledY = navBar.bottom
  }

  animationController?.setInsetsAndAlpha(
    Insets.of(0, 0, 0, scrolledY),
    1f,
    0f
  )

  return super.scrollVerticallyBy(dy, recycler, state)
}

@RequiresApi(Build.VERSION_CODES.R)
private fun createWindowInsetsAnimation() {
  view.windowInsetsController?.controlWindowInsetsAnimation(
    WindowInsetsCompat.Type.ime(), //types
    -1,                            //durationMillis
    LinearInterpolator(),          //interpolator
    CancellationSignal(),          //cancellationSignal
    animationControlListener       //listener
 )
}

private val animationControlListener: WindowInsetsAnimationControlListener by lazy {
  @RequiresApi(Build.VERSION_CODES.R)
  object : WindowInsetsAnimationControlListener {
 
    override fun onReady(
      controller: WindowInsetsAnimationController,
      types: Int
    ) {
      animationController = controller
    }
 
    override fun onFinished(controller: WindowInsetsAnimationController) {
      animationController = null
    }
 
    override fun onCancelled(controller: WindowInsetsAnimationController?) {
      animationController = null
    }
  }
}