diff --git a/packages/SystemUI/src/com/android/keyguard/BouncerKeyguardMessageArea.kt b/packages/SystemUI/src/com/android/keyguard/BouncerKeyguardMessageArea.kt
index 0075ddd73cd36..5277e40492e4d 100644
--- a/packages/SystemUI/src/com/android/keyguard/BouncerKeyguardMessageArea.kt
+++ b/packages/SystemUI/src/com/android/keyguard/BouncerKeyguardMessageArea.kt
@@ -16,19 +16,29 @@
 
 package com.android.keyguard
 
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.animation.AnimatorSet
+import android.animation.ObjectAnimator
 import android.content.Context
 import android.content.res.ColorStateList
 import android.content.res.TypedArray
 import android.graphics.Color
 import android.util.AttributeSet
+import android.view.View
 import com.android.settingslib.Utils
+import com.android.systemui.animation.Interpolators
 
 /** Displays security messages for the keyguard bouncer. */
-class BouncerKeyguardMessageArea(context: Context?, attrs: AttributeSet?) :
+open class BouncerKeyguardMessageArea(context: Context?, attrs: AttributeSet?) :
     KeyguardMessageArea(context, attrs) {
     private val DEFAULT_COLOR = -1
     private var mDefaultColorState: ColorStateList? = null
     private var mNextMessageColorState: ColorStateList? = ColorStateList.valueOf(DEFAULT_COLOR)
+    private val animatorSet = AnimatorSet()
+    private var textAboutToShow: CharSequence? = null
+    protected open val SHOW_DURATION_MILLIS = 150L
+    protected open val HIDE_DURATION_MILLIS = 200L
 
     override fun updateTextColor() {
         var colorState = mDefaultColorState
@@ -58,4 +68,46 @@ class BouncerKeyguardMessageArea(context: Context?, attrs: AttributeSet?) :
         mDefaultColorState = Utils.getColorAttr(context, android.R.attr.textColorPrimary)
         super.reloadColor()
     }
+
+    override fun setMessage(msg: CharSequence?) {
+        if (msg == textAboutToShow || msg == text) {
+            return
+        }
+        textAboutToShow = msg
+
+        if (animatorSet.isRunning) {
+            animatorSet.cancel()
+            textAboutToShow = null
+        }
+
+        val hideAnimator =
+            ObjectAnimator.ofFloat(this, View.ALPHA, 1f, 0f).apply {
+                duration = HIDE_DURATION_MILLIS
+                interpolator = Interpolators.STANDARD_ACCELERATE
+            }
+
+        hideAnimator.addListener(
+            object : AnimatorListenerAdapter() {
+                override fun onAnimationEnd(animation: Animator?) {
+                    super@BouncerKeyguardMessageArea.setMessage(msg)
+                }
+            }
+        )
+        val showAnimator =
+            ObjectAnimator.ofFloat(this, View.ALPHA, 0f, 1f).apply {
+                duration = SHOW_DURATION_MILLIS
+                interpolator = Interpolators.STANDARD_DECELERATE
+            }
+
+        showAnimator.addListener(
+            object : AnimatorListenerAdapter() {
+                override fun onAnimationEnd(animation: Animator?) {
+                    textAboutToShow = null
+                }
+            }
+        )
+
+        animatorSet.playSequentially(hideAnimator, showAnimator)
+        animatorSet.start()
+    }
 }
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java
index f26b9057dc7cf..73229c3210797 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java
@@ -152,6 +152,7 @@ public abstract class KeyguardInputViewController<T extends KeyguardInputView>
     }
 
     public void startAppearAnimation() {
+        mMessageAreaController.setMessage(getInitialMessageResId());
         mView.startAppearAnimation();
     }
 
@@ -169,6 +170,11 @@ public abstract class KeyguardInputViewController<T extends KeyguardInputView>
         return view.indexOfChild(mView);
     }
 
+    /** Determines the message to show in the bouncer when it first appears. */
+    protected int getInitialMessageResId() {
+        return 0;
+    }
+
     /** Factory for a {@link KeyguardInputViewController}. */
     public static class Factory {
         private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardMessageAreaController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardMessageAreaController.java
index c2802f7b68434..2bd3ca59b7408 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardMessageAreaController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardMessageAreaController.java
@@ -18,7 +18,6 @@ package com.android.keyguard;
 
 import android.content.res.ColorStateList;
 import android.content.res.Configuration;
-import android.text.TextUtils;
 
 import com.android.systemui.statusbar.policy.ConfigurationController;
 import com.android.systemui.statusbar.policy.ConfigurationController.ConfigurationListener;
@@ -100,15 +99,6 @@ public class KeyguardMessageAreaController<T extends KeyguardMessageArea>
         mView.setMessage(resId);
     }
 
-    /**
-     * Set Text if KeyguardMessageArea is empty.
-     */
-    public void setMessageIfEmpty(int resId) {
-        if (TextUtils.isEmpty(mView.getText())) {
-            setMessage(resId);
-        }
-    }
-
     public void setNextMessageColor(ColorStateList colorState) {
         mView.setNextMessageColor(colorState);
     }
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordViewController.java
index 29e912fdab32e..0025986c0e5c3 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordViewController.java
@@ -187,7 +187,7 @@ public class KeyguardPasswordViewController
     @Override
     void resetState() {
         mPasswordEntry.setTextOperationUser(UserHandle.of(KeyguardUpdateMonitor.getCurrentUser()));
-        mMessageAreaController.setMessage("");
+        mMessageAreaController.setMessage(getInitialMessageResId());
         final boolean wasDisabled = mPasswordEntry.isEnabled();
         mView.setPasswordEntryEnabled(true);
         mView.setPasswordEntryInputEnabled(true);
@@ -207,7 +207,6 @@ public class KeyguardPasswordViewController
         if (reason != KeyguardSecurityView.SCREEN_ON || mShowImeAtScreenOn) {
             showInput();
         }
-        mMessageAreaController.setMessageIfEmpty(R.string.keyguard_enter_your_password);
     }
 
     private void showInput() {
@@ -324,4 +323,9 @@ public class KeyguardPasswordViewController
                 //enabled input method subtype (The current IME should be LatinIME.)
                 || imm.getEnabledInputMethodSubtypeList(null, false).size() > 1;
     }
+
+    @Override
+    protected int getInitialMessageResId() {
+        return R.string.keyguard_enter_your_password;
+    }
 }
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPatternViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPatternViewController.java
index 987164557a7ad..1f0bd54f8e09e 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPatternViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPatternViewController.java
@@ -297,12 +297,6 @@ public class KeyguardPatternViewController
         displayDefaultSecurityMessage();
     }
 
-    @Override
-    public void onResume(int reason) {
-        super.onResume(reason);
-        mMessageAreaController.setMessageIfEmpty(R.string.keyguard_enter_your_pattern);
-    }
-
     @Override
     public boolean needsInput() {
         return false;
@@ -361,7 +355,7 @@ public class KeyguardPatternViewController
     }
 
     private void displayDefaultSecurityMessage() {
-        mMessageAreaController.setMessage("");
+        mMessageAreaController.setMessage(getInitialMessageResId());
     }
 
     private void handleAttemptLockout(long elapsedRealtimeDeadline) {
@@ -392,4 +386,9 @@ public class KeyguardPatternViewController
 
         }.start();
     }
+
+    @Override
+    protected int getInitialMessageResId() {
+        return R.string.keyguard_enter_your_pattern;
+    }
 }
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPinBasedInputViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPinBasedInputViewController.java
index 59a018ad51dfe..f7423ed12e684 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPinBasedInputViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPinBasedInputViewController.java
@@ -127,7 +127,6 @@ public abstract class KeyguardPinBasedInputViewController<T extends KeyguardPinB
     public void onResume(int reason) {
         super.onResume(reason);
         mPasswordEntry.requestFocus();
-        mMessageAreaController.setMessageIfEmpty(R.string.keyguard_enter_your_pin);
     }
 
     @Override
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java
index 89fcc47caf576..7876f071fdf51 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java
@@ -75,21 +75,14 @@ public class KeyguardPinViewController
         mView.reloadColors();
     }
 
-    @Override
-    void resetState() {
-        super.resetState();
-        mMessageAreaController.setMessage("");
-    }
-
-    @Override
-    public void startAppearAnimation() {
-        mMessageAreaController.setMessageIfEmpty(R.string.keyguard_enter_your_pin);
-        super.startAppearAnimation();
-    }
-
     @Override
     public boolean startDisappearAnimation(Runnable finishRunnable) {
         return mView.startDisappearAnimation(
                 mKeyguardUpdateMonitor.needsSlowUnlockTransition(), finishRunnable);
     }
+
+    @Override
+    protected int getInitialMessageResId() {
+        return R.string.keyguard_enter_your_pin;
+    }
 }
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/BouncerKeyguardMessageAreaTest.kt b/packages/SystemUI/tests/src/com/android/keyguard/BouncerKeyguardMessageAreaTest.kt
new file mode 100644
index 0000000000000..9d6aff219148b
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/keyguard/BouncerKeyguardMessageAreaTest.kt
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2020 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.keyguard
+
+import android.content.Context
+import android.testing.AndroidTestingRunner
+import android.testing.TestableLooper.RunWithLooper
+import android.util.AttributeSet
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mockito.spy
+import org.mockito.Mockito.times
+import org.mockito.Mockito.verify
+
+@SmallTest
+@RunWith(AndroidTestingRunner::class)
+@RunWithLooper
+class BouncerKeyguardMessageAreaTest : SysuiTestCase() {
+    class FakeBouncerKeyguardMessageArea(context: Context, attrs: AttributeSet?) :
+        BouncerKeyguardMessageArea(context, attrs) {
+        override val SHOW_DURATION_MILLIS = 0L
+        override val HIDE_DURATION_MILLIS = 0L
+    }
+    lateinit var underTest: BouncerKeyguardMessageArea
+
+    @Before
+    fun setup() {
+        underTest = FakeBouncerKeyguardMessageArea(context, null)
+    }
+
+    @Test
+    fun testSetSameMessage() {
+        val underTestSpy = spy(underTest)
+        underTestSpy.setMessage("abc")
+        underTestSpy.setMessage("abc")
+        verify(underTestSpy, times(1)).text = "abc"
+    }
+
+    @Test
+    fun testSetDifferentMessage() {
+        underTest.setMessage("abc")
+        underTest.setMessage("def")
+        assertThat(underTest.text).isEqualTo("def")
+    }
+
+    @Test
+    fun testSetNullMessage() {
+        underTest.setMessage(null)
+        assertThat(underTest.text).isEqualTo("")
+    }
+}
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardMessageAreaControllerTest.java b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardMessageAreaControllerTest.java
index 69524e5a4537d..5d2b0ca4e7eaf 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardMessageAreaControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardMessageAreaControllerTest.java
@@ -17,13 +17,11 @@
 package com.android.keyguard;
 
 import static org.mockito.ArgumentMatchers.eq;
-import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 
 import android.test.suitebuilder.annotation.SmallTest;
 import android.testing.AndroidTestingRunner;
 
-import com.android.systemui.R;
 import com.android.systemui.SysuiTestCase;
 import com.android.systemui.statusbar.policy.ConfigurationController;
 import com.android.systemui.statusbar.policy.ConfigurationController.ConfigurationListener;
@@ -92,19 +90,4 @@ public class KeyguardMessageAreaControllerTest extends SysuiTestCase {
         mMessageAreaController.setIsVisible(true);
         verify(mKeyguardMessageArea).setIsVisible(true);
     }
-
-    @Test
-    public void testSetMessageIfEmpty_empty() {
-        mMessageAreaController.setMessage("");
-        mMessageAreaController.setMessageIfEmpty(R.string.keyguard_enter_your_pin);
-        verify(mKeyguardMessageArea).setMessage(R.string.keyguard_enter_your_pin);
-    }
-
-    @Test
-    public void testSetMessageIfEmpty_notEmpty() {
-        mMessageAreaController.setMessage("abc");
-        mMessageAreaController.setMessageIfEmpty(R.string.keyguard_enter_your_pin);
-        verify(mKeyguardMessageArea, never()).setMessage(getContext()
-                .getResources().getText(R.string.keyguard_enter_your_pin));
-    }
 }
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPasswordViewControllerTest.kt b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPasswordViewControllerTest.kt
index b89dbd98968af..b369098cafc03 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPasswordViewControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPasswordViewControllerTest.kt
@@ -114,9 +114,8 @@ class KeyguardPasswordViewControllerTest : SysuiTestCase() {
     }
 
     @Test
-    fun onResume_testSetInitialText() {
-        keyguardPasswordViewController.onResume(KeyguardSecurityView.SCREEN_ON)
-        verify(mKeyguardMessageAreaController)
-            .setMessageIfEmpty(R.string.keyguard_enter_your_password)
+    fun startAppearAnimation() {
+        keyguardPasswordViewController.startAppearAnimation()
+        verify(mKeyguardMessageAreaController).setMessage(R.string.keyguard_enter_your_password)
     }
 }
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPatternViewControllerTest.kt b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPatternViewControllerTest.kt
index 3262a77b7711f..9eff70487c74e 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPatternViewControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPatternViewControllerTest.kt
@@ -100,16 +100,16 @@ class KeyguardPatternViewControllerTest : SysuiTestCase() {
     }
 
     @Test
-    fun onPause_clearsTextField() {
+    fun onPause_resetsText() {
         mKeyguardPatternViewController.init()
         mKeyguardPatternViewController.onPause()
-        verify(mKeyguardMessageAreaController).setMessage("")
+        verify(mKeyguardMessageAreaController).setMessage(R.string.keyguard_enter_your_pattern)
     }
 
+
     @Test
-    fun onResume_setInitialText() {
-        mKeyguardPatternViewController.onResume(KeyguardSecurityView.SCREEN_ON)
-        verify(mKeyguardMessageAreaController)
-            .setMessageIfEmpty(R.string.keyguard_enter_your_pattern)
+    fun startAppearAnimation() {
+        mKeyguardPatternViewController.startAppearAnimation()
+        verify(mKeyguardMessageAreaController).setMessage(R.string.keyguard_enter_your_pattern)
     }
 }
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinBasedInputViewControllerTest.java b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinBasedInputViewControllerTest.java
index 97d556b04aa4c..ce1101f389c01 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinBasedInputViewControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinBasedInputViewControllerTest.java
@@ -113,11 +113,4 @@ public class KeyguardPinBasedInputViewControllerTest extends SysuiTestCase {
         mKeyguardPinViewController.onResume(KeyguardSecurityView.SCREEN_ON);
         verify(mPasswordEntry).requestFocus();
     }
-
-    @Test
-    public void onResume_setInitialText() {
-        mKeyguardPinViewController.onResume(KeyguardSecurityView.SCREEN_ON);
-        verify(mKeyguardMessageAreaController).setMessageIfEmpty(R.string.keyguard_enter_your_pin);
-    }
 }
-
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinViewControllerTest.kt b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinViewControllerTest.kt
index 9e5bfe53ea053..d9efdeaea04c9 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinViewControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/keyguard/KeyguardPinViewControllerTest.kt
@@ -98,6 +98,6 @@ class KeyguardPinViewControllerTest : SysuiTestCase() {
     @Test
     fun startAppearAnimation() {
         pinViewController.startAppearAnimation()
-        verify(keyguardMessageAreaController).setMessageIfEmpty(R.string.keyguard_enter_your_pin)
+        verify(keyguardMessageAreaController).setMessage(R.string.keyguard_enter_your_pin)
     }
 }