nickbutcher

<!-- Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 -->
<ViewGroup …
  android:background="?attr/colorSurface">

nickbutcher

<!-- Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 -->

<!-- AndroidManifest.xml -->
<application …
  android:theme="@style/Theme.Plaid">
<activity …
  android:theme="@style/Theme.Plaid.About"/>

<!-- layout/foo.xml -->

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
val lightPalette = object : ColorPalette { … }
val darkPalette = object : ColorPalette { … }
val view = MyView(if (isDarkTheme) darkPalette else lightPalette)

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
interface ColorPalette {
  @ColorInt val colorPrimary
  @ColorInt val colorSecondary
}

class MyView(colors: ColorPalette) {
  fab.backgroundTint = colors.colorPrimary
}

nickbutcher

<!-- Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 -->
<style name="Theme.Plaid" parent="…">
  <item name="colorPrimary">@color/teal_500</item>
  <item name="colorSecondary">@color/pink_200</item>
  <item name="android:windowBackground">@color/white</item>
</style>

nickbutcher

<!-- Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 -->
<Button …
  style="@style/Widget.Plaid.Button.InlineAction"/>

nickbutcher

<!-- Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 -->
<Button …
  android:gravity="center_horizontal"
  android:textAppearance="@style/TextAppearance.CommentAuthor"
  android:drawablePadding="@dimen/spacing_micro"/>

nickbutcher

<!-- Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 -->
<style name="Widget.Plaid.Button.InlineAction" parent="…">
  <item name="android:gravity">center_horizontal</item>
  <item name="android:textAppearance">@style/TextAppearance.CommentAuthor</item>
  <item name="android:drawablePadding">@dimen/spacing_micro</item>
</style>

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
  view.visibility = View.VISIBLE
  val spring = view.spring(SpringAnimation.ALPHA)

  (view.getTag(R.id.tag_pending_end_listener) as?
        DynamicAnimation.OnAnimationEndListener)?.let {

nickbutcher

/* Copyright 2019 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
- val anim = view.animate().alpha(targetAlpha)
+ val spring = view.spring(SpringAnimation.ALPHA)
+ spring.animateToFinalPosition(targetAlpha)