feat: add approximate android Q transition

packages/stack/src/TransitionConfigs/CardStyleInterpolators.tsx

@@ -198,3 +198,34 @@ export function forRevealFromBottomAndroid({
     overlayStyle: { opacity: overlayOpacity },
   };
 }
+
+/**
+ * Standard Android-style reveal from the bottom for Android Q.
+ * TODO: Update this with correct values when AOSP is updated.
+ */
+export function forScaleFromCenterAndroid({
+  current,
+  next,
+}: CardInterpolationProps): CardInterpolatedStyle {
+  const cardOpacityFocused = interpolate(current.progress, {
+    inputRange: [0, 0.5, 1],
+    outputRange: [0, 1, 1],
+  });
+  const cardScaleFocused = interpolate(current.progress, {
+    inputRange: [0, 1],
+    outputRange: [0.9, 1],
+  });
+  const cardScaleUnFocused = next
+    ? interpolate(next.progress, {
+        inputRange: [0, 1],
+        outputRange: [1, 1.1],
+      })
+    : 1;
+
+  return {
+    containerStyle: {
+      opacity: cardOpacityFocused,
+      transform: [{ scale: cardScaleFocused }, { scale: cardScaleUnFocused }],
+    },
+  };
+}

packages/stack/src/TransitionConfigs/TransitionPresets.tsx

@@ -1,6 +1,7 @@
 import {
   forHorizontalIOS,
   forVerticalIOS,
+  forScaleFromCenterAndroid,
   forRevealFromBottomAndroid,
   forFadeFromBottomAndroid,
   forModalPresentationIOS,
@@ -8,6 +9,7 @@ import {
 import { forNoAnimation, forFade } from './HeaderStyleInterpolators';
 import {
   TransitionIOSSpec,
+  ScaleFromCenterAndroidSpec,
   RevealFromBottomAndroidSpec,
   FadeOutToBottomAndroidSpec,
   FadeInFromBottomAndroidSpec,
@@ -70,7 +72,7 @@ export const FadeFromBottomAndroid: TransitionPreset = {
 };
 
 /**
- * Standard Android navigation transition when opening or closing an Activity on Android >= 9 (Pie).
+ * Standard Android navigation transition when opening or closing an Activity on Android 9 (Pie).
  */
 export const RevealFromBottomAndroid: TransitionPreset = {
   gestureDirection: 'vertical',
@@ -82,6 +84,19 @@ export const RevealFromBottomAndroid: TransitionPreset = {
   headerStyleInterpolator: forNoAnimation,
 };
 
+/**
+ * Standard Android navigation transition when opening or closing an Activity on Android 10 (Q).
+ */
+export const ScaleFromCenterAndroid: TransitionPreset = {
+  gestureDirection: 'horizontal',
+  transitionSpec: {
+    open: ScaleFromCenterAndroidSpec,
+    close: ScaleFromCenterAndroidSpec,
+  },
+  cardStyleInterpolator: forScaleFromCenterAndroid,
+  headerStyleInterpolator: forNoAnimation,
+};
+
 /**
  * Default navigation transition for the current platform.
  */

packages/stack/src/TransitionConfigs/TransitionSpecs.tsx

@@ -53,3 +53,15 @@ export const RevealFromBottomAndroidSpec: TransitionSpec = {
     easing: Easing.bezier(0.35, 0.45, 0, 1),
   },
 };
+
+/**
+ * Approximate configuration for activity open animation from Android Q.
+ * TODO: Update this with correct values when AOSP is updated.
+ */
+export const ScaleFromCenterAndroidSpec: TransitionSpec = {
+  animation: 'timing',
+  config: {
+    duration: 425,
+    easing: Easing.bezier(0.35, 0.45, 0, 1),
+  },
+};