nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
fun View.spring(
  property: ViewProperty
): SpringAnimation {
  val key = getKey(property)
  var springAnim = getTag(key) as? SpringAnimation?
  if (springAnim == null) {
    springAnim = SpringAnimation(this, property)
    setTag(key, springAnim)

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
- val anim = ObjectAnimator.ofFloat(view, View.ALPHA, targetAlpha)
- if (!visible) {
-   anim.doOnEnd { view.visibility = View.GONE }
- }
+ val anim = view.animate().alpha(targetAlpha)
+ if (!visible) {
+   anim.withEndAction { view.visibility = View.GONE }
+ }

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
- ObjectAnimator.ofFloat(view, View.ALPHA, 0f, 1f).start()
+ ObjectAnimator.ofFloat(view, View.ALPHA, 1f).start()

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
fun animateVisibility(view: View, visible: Boolean) {
  view.visibility = View.VISIBLE
  if (visible) {
    ObjectAnimator.ofFloat(view, View.ALPHA, 0f, 1f).start()
  } else {
    ObjectAnimator.ofFloat(view, View.ALPHA, 1f, 0f).apply {
      doOnEnd { view.visibility = View.GONE }
    }.start()

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
data class LoginUiModel(
  val submitEnabled: Boolean,
  val loginInProgress: Boolean
)
…
setVisibility(login, !uiModel.loginInProgress)
setVisibility(progress, uiModel.loginInProgress)
…

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
fun animateVisibility(view: View, visible: Boolean) {
+ val targetAlpha = if (visible) 1f else 0f
+ if (view.alpha == targetAlpha) return

nickbutcher

/*
 *  Copyright 2018 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

nickbutcher

/* Copyright 2018 Google LLC.
   SPDX-License-Identifier: Apache-2.0 */
val progressBar = findViewById<ProgressBar>(R.id.loading)
val drawable = AppCompatResources.getDrawable(context, R.drawable.loading_indeterminate)
progressBar.indeterminateDrawable = drawable

nickbutcher

<!-- Copyright 2018 Google LLC.
     SPDX-License-Identifier: Apache-2.0 -->
<animated-selector ...>
  <item android:state_foo="true" android:drawable="@drawable/some_vector" />
  <item android:drawable="@drawable/some_other_vector" />
  <!-- no transitions specified -->
</animated-selector>

nickbutcher

<!-- Copyright 2018 Google LLC.
     SPDX-License-Identifier: Apache-2.0 -->
<layout ...>
  <data>
    <import type="your.package.R" alias="R" />
    ...
  </data>

  <ProgressBar ...
    app:indeterminateDrawableCompat="@{R.drawable.foo}" />