diff --git a/libs/WindowManager/Shell/multivalentTests/Android.bp b/libs/WindowManager/Shell/multivalentTests/Android.bp
index 1686d0d..1ad19c9 100644
--- a/libs/WindowManager/Shell/multivalentTests/Android.bp
+++ b/libs/WindowManager/Shell/multivalentTests/Android.bp
@@ -46,6 +46,7 @@
     exclude_srcs: ["src/com/android/wm/shell/bubbles/BubbleStackViewTest.kt"],
     static_libs: [
         "junit",
+        "androidx.core_core-animation-testing",
         "androidx.test.runner",
         "androidx.test.rules",
         "androidx.test.ext.junit",
@@ -64,6 +65,7 @@
     static_libs: [
         "WindowManager-Shell",
         "junit",
+        "androidx.core_core-animation-testing",
         "androidx.test.runner",
         "androidx.test.rules",
         "androidx.test.ext.junit",
diff --git a/libs/WindowManager/Shell/multivalentTests/src/com/android/wm/shell/bubbles/bar/BubbleBarDropTargetControllerTest.kt b/libs/WindowManager/Shell/multivalentTests/src/com/android/wm/shell/bubbles/bar/BubbleBarDropTargetControllerTest.kt
new file mode 100644
index 0000000..2ac7791
--- /dev/null
+++ b/libs/WindowManager/Shell/multivalentTests/src/com/android/wm/shell/bubbles/bar/BubbleBarDropTargetControllerTest.kt
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+package com.android.wm.shell.bubbles.bar
+
+import android.content.Context
+import android.graphics.Insets
+import android.graphics.Rect
+import android.view.View
+import android.view.WindowManager
+import android.widget.FrameLayout
+import androidx.core.animation.AnimatorTestRule
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.SmallTest
+import androidx.test.platform.app.InstrumentationRegistry
+import com.android.internal.protolog.common.ProtoLog
+import com.android.wm.shell.R
+import com.android.wm.shell.bubbles.BubblePositioner
+import com.android.wm.shell.bubbles.DeviceConfig
+import com.android.wm.shell.bubbles.bar.BubbleBarDropTargetController.Companion.DROP_TARGET_ALPHA_IN_DURATION
+import com.android.wm.shell.bubbles.bar.BubbleBarDropTargetController.Companion.DROP_TARGET_ALPHA_OUT_DURATION
+import com.android.wm.shell.bubbles.bar.BubbleBarDropTargetController.Companion.DROP_TARGET_SCALE
+import com.android.wm.shell.common.bubbles.BubbleBarLocation
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.ClassRule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/** Tests for [BubbleBarDropTargetController] */
+@SmallTest
+@RunWith(AndroidJUnit4::class)
+class BubbleBarDropTargetControllerTest {
+
+    companion object {
+        @JvmField @ClassRule val animatorTestRule: AnimatorTestRule = AnimatorTestRule()
+    }
+
+    private val context = ApplicationProvider.getApplicationContext<Context>()
+    private lateinit var controller: BubbleBarDropTargetController
+    private lateinit var positioner: BubblePositioner
+    private lateinit var container: FrameLayout
+
+    @Before
+    fun setUp() {
+        ProtoLog.REQUIRE_PROTOLOGTOOL = false
+        container = FrameLayout(context)
+        val windowManager = context.getSystemService(WindowManager::class.java)
+        positioner = BubblePositioner(context, windowManager)
+        positioner.setShowingInBubbleBar(true)
+        val deviceConfig =
+            DeviceConfig(
+                windowBounds = Rect(0, 0, 2000, 2600),
+                isLargeScreen = true,
+                isSmallTablet = false,
+                isLandscape = true,
+                isRtl = false,
+                insets = Insets.of(10, 20, 30, 40)
+            )
+        positioner.update(deviceConfig)
+        positioner.bubbleBarBounds = Rect(1800, 2400, 1970, 2560)
+
+        controller = BubbleBarDropTargetController(context, container, positioner)
+    }
+
+    @Test
+    fun show_moveLeftToRight_isVisibleWithExpectedBounds() {
+        val expectedBoundsOnLeft = getExpectedDropTargetBounds(onLeft = true)
+        val expectedBoundsOnRight = getExpectedDropTargetBounds(onLeft = false)
+
+        runOnMainSync { controller.show(BubbleBarLocation.LEFT) }
+        waitForAnimateIn()
+        val viewOnLeft = getDropTargetView()
+        assertThat(viewOnLeft).isNotNull()
+        assertThat(viewOnLeft!!.alpha).isEqualTo(1f)
+        assertThat(viewOnLeft.layoutParams.width).isEqualTo(expectedBoundsOnLeft.width())
+        assertThat(viewOnLeft.layoutParams.height).isEqualTo(expectedBoundsOnLeft.height())
+        assertThat(viewOnLeft.x).isEqualTo(expectedBoundsOnLeft.left)
+        assertThat(viewOnLeft.y).isEqualTo(expectedBoundsOnLeft.top)
+
+        runOnMainSync { controller.show(BubbleBarLocation.RIGHT) }
+        waitForAnimateOut()
+        waitForAnimateIn()
+        val viewOnRight = getDropTargetView()
+        assertThat(viewOnRight).isNotNull()
+        assertThat(viewOnRight!!.alpha).isEqualTo(1f)
+        assertThat(viewOnRight.layoutParams.width).isEqualTo(expectedBoundsOnRight.width())
+        assertThat(viewOnRight.layoutParams.height).isEqualTo(expectedBoundsOnRight.height())
+        assertThat(viewOnRight.x).isEqualTo(expectedBoundsOnRight.left)
+        assertThat(viewOnRight.y).isEqualTo(expectedBoundsOnRight.top)
+    }
+
+    @Test
+    fun toggleSetHidden_dropTargetShown_updatesAlpha() {
+        runOnMainSync { controller.show(BubbleBarLocation.RIGHT) }
+        waitForAnimateIn()
+        val view = getDropTargetView()
+        assertThat(view).isNotNull()
+        assertThat(view!!.alpha).isEqualTo(1f)
+
+        runOnMainSync { controller.setHidden(true) }
+        waitForAnimateOut()
+        val hiddenView = getDropTargetView()
+        assertThat(hiddenView).isNotNull()
+        assertThat(hiddenView!!.alpha).isEqualTo(0f)
+
+        runOnMainSync { controller.setHidden(false) }
+        waitForAnimateIn()
+        val shownView = getDropTargetView()
+        assertThat(shownView).isNotNull()
+        assertThat(shownView!!.alpha).isEqualTo(1f)
+    }
+
+    @Test
+    fun toggleSetHidden_dropTargetNotShown_viewNotCreated() {
+        runOnMainSync { controller.setHidden(true) }
+        waitForAnimateOut()
+        assertThat(getDropTargetView()).isNull()
+        runOnMainSync { controller.setHidden(false) }
+        waitForAnimateIn()
+        assertThat(getDropTargetView()).isNull()
+    }
+
+    @Test
+    fun dismiss_dropTargetShown_viewRemoved() {
+        runOnMainSync { controller.show(BubbleBarLocation.LEFT) }
+        waitForAnimateIn()
+        assertThat(getDropTargetView()).isNotNull()
+        runOnMainSync { controller.dismiss() }
+        waitForAnimateOut()
+        assertThat(getDropTargetView()).isNull()
+    }
+
+    @Test
+    fun dismiss_dropTargetNotShown_doesNothing() {
+        runOnMainSync { controller.dismiss() }
+        waitForAnimateOut()
+        assertThat(getDropTargetView()).isNull()
+    }
+
+    private fun getDropTargetView(): View? = container.findViewById(R.id.bubble_bar_drop_target)
+
+    private fun getExpectedDropTargetBounds(onLeft: Boolean): Rect {
+        val rect = Rect()
+        positioner.getBubbleBarExpandedViewBounds(onLeft, false /* isOveflowExpanded */, rect)
+        // Scale the rect to expected size, but keep the center point the same
+        val centerX = rect.centerX()
+        val centerY = rect.centerY()
+        rect.scale(DROP_TARGET_SCALE)
+        rect.offset(centerX - rect.centerX(), centerY - rect.centerY())
+        return rect
+    }
+
+    private fun runOnMainSync(runnable: Runnable) {
+        InstrumentationRegistry.getInstrumentation().runOnMainSync(runnable)
+    }
+
+    private fun waitForAnimateIn() {
+        // Advance animator for on-device test
+        runOnMainSync { animatorTestRule.advanceTimeBy(DROP_TARGET_ALPHA_IN_DURATION) }
+    }
+
+    private fun waitForAnimateOut() {
+        // Advance animator for on-device test
+        runOnMainSync { animatorTestRule.advanceTimeBy(DROP_TARGET_ALPHA_OUT_DURATION) }
+    }
+}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/bar/BubbleBarDropTargetController.kt b/libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/bar/BubbleBarDropTargetController.kt
index 55ec6cd..f6b4653 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/bar/BubbleBarDropTargetController.kt
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/bar/BubbleBarDropTargetController.kt
@@ -21,6 +21,10 @@
 import android.view.View
 import android.widget.FrameLayout
 import android.widget.FrameLayout.LayoutParams
+import androidx.annotation.VisibleForTesting
+import androidx.core.animation.Animator
+import androidx.core.animation.AnimatorListenerAdapter
+import androidx.core.animation.ObjectAnimator
 import com.android.wm.shell.R
 import com.android.wm.shell.bubbles.BubblePositioner
 import com.android.wm.shell.common.bubbles.BubbleBarLocation
@@ -33,6 +37,7 @@
 ) {
 
     private var dropTargetView: View? = null
+    private var animator: ObjectAnimator? = null
     private val tempRect: Rect by lazy(LazyThreadSafetyMode.NONE) { Rect() }
 
     /**
@@ -57,7 +62,8 @@
     /**
      * Set the view hidden or not
      *
-     * Requires the drop target to be first shown by calling [show]. Otherwise does not do anything.
+     * Requires the drop target to be first shown by calling [animateIn]. Otherwise does not do
+     * anything.
      */
     fun setHidden(hidden: Boolean) {
         val targetView = dropTargetView ?: return
@@ -106,20 +112,40 @@
     }
 
     private fun View.animateIn() {
-        animate().alpha(1f).setDuration(DROP_TARGET_ALPHA_IN_DURATION).start()
+        animator?.cancel()
+        animator =
+            ObjectAnimator.ofFloat(this, View.ALPHA, 1f)
+                .setDuration(DROP_TARGET_ALPHA_IN_DURATION)
+                .addEndAction { animator = null }
+        animator?.start()
     }
 
     private fun View.animateOut(endAction: Runnable? = null) {
-        animate()
-            .alpha(0f)
-            .setDuration(DROP_TARGET_ALPHA_OUT_DURATION)
-            .withEndAction(endAction)
-            .start()
+        animator?.cancel()
+        animator =
+            ObjectAnimator.ofFloat(this, View.ALPHA, 0f)
+                .setDuration(DROP_TARGET_ALPHA_OUT_DURATION)
+                .addEndAction {
+                    endAction?.run()
+                    animator = null
+                }
+        animator?.start()
+    }
+
+    private fun <T : Animator> T.addEndAction(runnable: Runnable): T {
+        addListener(
+            object : AnimatorListenerAdapter() {
+                override fun onAnimationEnd(animation: Animator) {
+                    runnable.run()
+                }
+            }
+        )
+        return this
     }
 
     companion object {
-        private const val DROP_TARGET_ALPHA_IN_DURATION = 150L
-        private const val DROP_TARGET_ALPHA_OUT_DURATION = 100L
-        private const val DROP_TARGET_SCALE = 0.9f
+        @VisibleForTesting const val DROP_TARGET_ALPHA_IN_DURATION = 150L
+        @VisibleForTesting const val DROP_TARGET_ALPHA_OUT_DURATION = 100L
+        @VisibleForTesting const val DROP_TARGET_SCALE = 0.9f
     }
 }