Fix the activity enter / exit animation.

Bug: 274139430
Test: manual (see bug for recording)
Change-Id: I9c17a7c7456f6e031607e9b50682097537a65115

packages/CredentialManager/res/values/colors.xml

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-  <color name="purple_200">#FFBB86FC</color>
-  <color name="purple_500">#FF6200EE</color>
-  <color name="purple_700">#FF3700B3</color>
-  <color name="teal_200">#FF03DAC5</color>
-  <color name="teal_700">#FF018786</color>
-  <color name="black">#FF000000</color>
-  <color name="white">#FFFFFFFF</color>
-</resources>

packages/CredentialManager/res/values/strings.xml

@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2023 The Android Open Source Project
+  ~
+  ~ 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 KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
   <!-- The name of this application. Credential Manager is a service that centralizes and provides
   access to a user's credentials used to sign in to various apps. [CHAR LIMIT=80] -->

packages/CredentialManager/res/values/themes.xml

@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2023 The Android Open Source Project
+  ~
+  ~ 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 KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
 <resources>
   <style name="Theme.CredentialSelector" parent="@*android:style/ThemeOverlay.DeviceDefault.Accent.DayNight">
     <item name="android:windowContentOverlay">@null</item>

packages/CredentialManager/src/com/android/credentialmanager/CredentialSelectorActivity.kt

@@ -16,6 +16,7 @@
 
 package com.android.credentialmanager
 
+import android.app.Activity
 import android.content.Intent
 import android.credentials.ui.BaseDialogResult
 import android.credentials.ui.RequestInfo
@@ -47,6 +48,8 @@ import com.android.credentialmanager.ui.theme.PlatformTheme
 class CredentialSelectorActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        overrideActivityTransition(Activity.OVERRIDE_TRANSITION_OPEN,
+            0, 0)
         Log.d(Constants.LOG_TAG, "Creating new CredentialSelectorActivity")
         try {
             val (isCancellationRequest, shouldShowCancellationUi, _) =

packages/CredentialManager/src/com/android/credentialmanager/common/material/ModalBottomSheet.kt

@@ -454,7 +454,7 @@ internal fun Scrim(
     if (color.isSpecified) {
         val alpha by animateFloatAsState(
             targetValue = if (visible) 1f else 0f,
-            animationSpec = TweenSpec()
+            animationSpec = TweenSpec(durationMillis = SwipeableDefaults.DefaultDurationMillis)
         )
         LocalConfiguration.current
         val resources = LocalContext.current.resources

packages/CredentialManager/src/com/android/credentialmanager/common/material/Swipeable.kt

@@ -19,6 +19,7 @@ package com.android.credentialmanager.common.material
 import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.AnimationSpec
 import androidx.compose.animation.core.SpringSpec
+import androidx.compose.animation.core.Spring
 import androidx.compose.foundation.gestures.DraggableState
 import androidx.compose.foundation.gestures.Orientation
 import androidx.compose.foundation.gestures.draggable
@@ -791,7 +792,12 @@ object SwipeableDefaults {
     /**
      * The default animation used by [SwipeableState].
      */
-    val AnimationSpec = SpringSpec<Float>()
+    val AnimationSpec = SpringSpec<Float>(stiffness = Spring.StiffnessMediumLow)
+
+    /**
+     * The default animation duration used by Scrim in enter/exit transitions.
+     */
+    val DefaultDurationMillis: Int = 400
 
     /**
      * The default velocity threshold (1.8 dp per millisecond) used by [swipeable].

packages/CredentialManager/src/com/android/credentialmanager/common/ui/BottomSheet.kt

@@ -20,6 +20,11 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.ColumnScope
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import com.android.compose.rememberSystemUiController
@@ -28,6 +33,8 @@ import com.android.credentialmanager.common.material.ModalBottomSheetValue
 import com.android.credentialmanager.common.material.rememberModalBottomSheetState
 import com.android.credentialmanager.ui.theme.EntryShape
 import com.android.credentialmanager.ui.theme.LocalAndroidColorScheme
+import kotlinx.coroutines.launch
+
 
 /** Draws a modal bottom sheet with the same styles and effects shared by various flows. */
 @Composable
@@ -35,8 +42,10 @@ fun ModalBottomSheet(
     sheetContent: @Composable ColumnScope.() -> Unit,
     onDismiss: () -> Unit
 ) {
+    var isInitialRender by remember { mutableStateOf(true) }
+    val scope = rememberCoroutineScope()
     val state = rememberModalBottomSheetState(
-        initialValue = ModalBottomSheetValue.Expanded,
+        initialValue = ModalBottomSheetValue.Hidden,
         skipHalfExpanded = true
     )
     val sysUiController = rememberSystemUiController()
@@ -54,7 +63,12 @@ fun ModalBottomSheet(
     ) {}
     LaunchedEffect(state.currentValue) {
         if (state.currentValue == ModalBottomSheetValue.Hidden) {
-            onDismiss()
+            if (isInitialRender) {
+                isInitialRender = false
+                scope.launch { state.show() }
+            } else {
+                onDismiss()
+            }
         }
     }
 }