From 3c729321dc64bbeb5b60d51c25491baf06ea8a80 Mon Sep 17 00:00:00 2001
From: Lais Andrade <lsandrade@google.com>
Date: Wed, 30 Jun 2021 12:18:00 +0100
Subject: [PATCH] Add support to slowly bring the vibrator down in
 VibrationThread

Add support to slowly bring down the vibrator amplitude when a vibration
ends at a positive amplitude or when it is cancelled while playing at a
positive amplitude.

This uses the same duration configured to ramp down PWLE and step
waveforms, and the duration is not considered part of the user defined
vibration.

Bug: 188431691
Test: VibrationThreadTest
Change-Id: I642e898c3b13b2c841543e870275e40df4d00b81
---
 core/res/res/values/config.xml                |   3 +-
 .../server/vibrator/VibrationSettings.java    |  16 +-
 .../server/vibrator/VibrationThread.java      | 443 +++++++++++++++---
 .../server/vibrator/VibratorController.java   |  44 +-
 .../vibrator/VibratorManagerService.java      |  33 +-
 .../server/vibrator/VibrationThreadTest.java  | 250 ++++++++--
 .../vibrator/VibratorManagerServiceTest.java  |  40 +-
 7 files changed, 686 insertions(+), 143 deletions(-)

diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 8dfbdccf5706e..2770cbef6dfc7 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -3370,8 +3370,7 @@
     <integer name="config_vibrationWaveformRampStepDuration">5</integer>
 
     <!-- The duration (in milliseconds) that should be applied to waveform vibrations that ends in
-         non-zero amplitudes, . The waveform will
-         be played as a PWLE instead of on/off calls if this value is set. -->
+         non-zero amplitudes, to bring the vibrator amplitude down to zero using this timing. -->
     <integer name="config_vibrationWaveformRampDownDuration">0</integer>
 
     <!-- Number of retries Cell Data should attempt for a given error code before
diff --git a/services/core/java/com/android/server/vibrator/VibrationSettings.java b/services/core/java/com/android/server/vibrator/VibrationSettings.java
index c0a1d92104c57..4f484426009e9 100644
--- a/services/core/java/com/android/server/vibrator/VibrationSettings.java
+++ b/services/core/java/com/android/server/vibrator/VibrationSettings.java
@@ -99,16 +99,24 @@ final class VibrationSettings {
     private boolean mLowPowerMode;
 
     VibrationSettings(Context context, Handler handler) {
+        this(context, handler,
+                context.getResources().getInteger(
+                        com.android.internal.R.integer.config_vibrationWaveformRampDownDuration),
+                context.getResources().getInteger(
+                        com.android.internal.R.integer.config_vibrationWaveformRampStepDuration));
+    }
+
+    @VisibleForTesting
+    VibrationSettings(Context context, Handler handler, int rampDownDuration,
+            int rampStepDuration) {
         mContext = context;
         mSettingObserver = new SettingsObserver(handler);
         mUidObserver = new UidObserver();
         mUserReceiver = new UserObserver();
 
         // TODO(b/191150049): move these to vibrator static config file
-        mRampStepDuration = context.getResources().getInteger(
-                com.android.internal.R.integer.config_vibrationWaveformRampStepDuration);
-        mRampDownDuration = context.getResources().getInteger(
-                com.android.internal.R.integer.config_vibrationWaveformRampDownDuration);
+        mRampDownDuration = rampDownDuration;
+        mRampStepDuration = rampStepDuration;
 
         VibrationEffect clickEffect = createEffectFromResource(
                 com.android.internal.R.array.config_virtualKeyVibePattern);
diff --git a/services/core/java/com/android/server/vibrator/VibrationThread.java b/services/core/java/com/android/server/vibrator/VibrationThread.java
index 45d511159e11d..03863723a5e95 100644
--- a/services/core/java/com/android/server/vibrator/VibrationThread.java
+++ b/services/core/java/com/android/server/vibrator/VibrationThread.java
@@ -61,6 +61,9 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
      */
     private static final long CALLBACKS_EXTRA_TIMEOUT = 100;
 
+    /** Threshold to prevent the ramp off steps from trying to set extremely low amplitudes. */
+    private static final float RAMP_OFF_AMPLITUDE_MIN = 1e-3f;
+
     /** Fixed large duration used to note repeating vibrations to {@link IBatteryStats}. */
     private static final long BATTERY_STATS_REPEATING_VIBRATION_DURATION = 5_000;
 
@@ -87,26 +90,33 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         /** Callback triggered to cancel a prepared synced vibration. */
         void cancelSyncedVibration();
 
-        /** Callback triggered when vibration thread is complete. */
-        void onVibrationEnded(long vibrationId, Vibration.Status status);
+        /** Callback triggered when the vibration is complete. */
+        void onVibrationCompleted(long vibrationId, Vibration.Status status);
+
+        /** Callback triggered when the vibrators are released after the thread is complete. */
+        void onVibratorsReleased();
     }
 
     private final Object mLock = new Object();
     private final WorkSource mWorkSource = new WorkSource();
     private final PowerManager.WakeLock mWakeLock;
     private final IBatteryStats mBatteryStatsService;
+    private final VibrationSettings mVibrationSettings;
     private final DeviceVibrationEffectAdapter mDeviceEffectAdapter;
     private final Vibration mVibration;
     private final VibrationCallbacks mCallbacks;
     private final SparseArray<VibratorController> mVibrators = new SparseArray<>();
     private final StepQueue mStepQueue = new StepQueue();
 
+    private volatile boolean mStop;
     private volatile boolean mForceStop;
 
-    VibrationThread(Vibration vib, DeviceVibrationEffectAdapter effectAdapter,
+    VibrationThread(Vibration vib, VibrationSettings vibrationSettings,
+            DeviceVibrationEffectAdapter effectAdapter,
             SparseArray<VibratorController> availableVibrators, PowerManager.WakeLock wakeLock,
             IBatteryStats batteryStatsService, VibrationCallbacks callbacks) {
         mVibration = vib;
+        mVibrationSettings = vibrationSettings;
         mDeviceEffectAdapter = effectAdapter;
         mCallbacks = callbacks;
         mWakeLock = wakeLock;
@@ -145,8 +155,8 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         mWakeLock.acquire();
         try {
             mVibration.token.linkToDeath(this, 0);
-            Vibration.Status status = playVibration();
-            mCallbacks.onVibrationEnded(mVibration.id, status);
+            playVibration();
+            mCallbacks.onVibratorsReleased();
         } catch (RemoteException e) {
             Slog.e(TAG, "Error linking vibration to token death", e);
         } finally {
@@ -155,9 +165,13 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         }
     }
 
-    /** Cancel current vibration and shuts down the thread gracefully. */
+    /** Cancel current vibration and ramp down the vibrators gracefully. */
     public void cancel() {
-        mForceStop = true;
+        if (mStop) {
+            // Already cancelled, running clean-up steps.
+            return;
+        }
+        mStop = true;
         synchronized (mLock) {
             if (DEBUG) {
                 Slog.d(TAG, "Vibration cancelled");
@@ -166,6 +180,21 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         }
     }
 
+    /** Cancel current vibration and shuts off the vibrators immediately. */
+    public void cancelImmediately() {
+        if (mForceStop) {
+            // Already forced the thread to stop, wait for it to finish.
+            return;
+        }
+        mStop = mForceStop = true;
+        synchronized (mLock) {
+            if (DEBUG) {
+                Slog.d(TAG, "Vibration cancelled immediately");
+            }
+            mLock.notify();
+        }
+    }
+
     /** Notify current vibration that a synced step has completed. */
     public void syncedVibrationComplete() {
         synchronized (mLock) {
@@ -190,17 +219,18 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         }
     }
 
-    private Vibration.Status playVibration() {
+    private void playVibration() {
         Trace.traceBegin(Trace.TRACE_TAG_VIBRATOR, "playVibration");
         try {
-            CombinedVibration.Sequential effect = toSequential(mVibration.getEffect());
-            mStepQueue.offer(new StartVibrateStep(effect));
+            CombinedVibration.Sequential sequentialEffect = toSequential(mVibration.getEffect());
+            final int sequentialEffectSize = sequentialEffect.getEffects().size();
+            mStepQueue.offer(new StartVibrateStep(sequentialEffect));
 
-            int stepsPlayed = 0;
+            Vibration.Status status = null;
             while (!mStepQueue.isEmpty()) {
                 long waitTime = mStepQueue.calculateWaitTime();
                 if (waitTime <= 0) {
-                    stepsPlayed += mStepQueue.consumeNext();
+                    mStepQueue.consumeNext();
                 } else {
                     synchronized (mLock) {
                         try {
@@ -209,17 +239,33 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
                         }
                     }
                 }
+                Vibration.Status currentStatus = mStop ? Vibration.Status.CANCELLED
+                        : mStepQueue.calculateVibrationStatus(sequentialEffectSize);
+                if (status == null && currentStatus != Vibration.Status.RUNNING) {
+                    // First time vibration stopped running, start clean-up tasks and notify
+                    // callback immediately.
+                    status = currentStatus;
+                    mCallbacks.onVibrationCompleted(mVibration.id, status);
+                    if (status == Vibration.Status.CANCELLED) {
+                        mStepQueue.cancel();
+                    }
+                }
                 if (mForceStop) {
-                    mStepQueue.cancel();
-                    return Vibration.Status.CANCELLED;
+                    // Cancel every step and stop playing them right away, even clean-up steps.
+                    mStepQueue.cancelImmediately();
+                    break;
                 }
             }
 
-            // Some effects might be ignored because the specified vibrator don't exist or doesn't
-            // support the effect. We only report ignored here if nothing was played besides the
-            // StartVibrateStep (which means every attempt to turn on the vibrator was ignored).
-            return stepsPlayed > effect.getEffects().size()
-                    ? Vibration.Status.FINISHED : Vibration.Status.IGNORED_UNSUPPORTED;
+            if (status == null) {
+                status = mStepQueue.calculateVibrationStatus(sequentialEffectSize);
+                if (status == Vibration.Status.RUNNING) {
+                    Slog.w(TAG, "Something went wrong, step queue completed but vibration status"
+                            + " is still RUNNING for vibration " + mVibration.id);
+                    status = Vibration.Status.FINISHED;
+                }
+                mCallbacks.onVibrationCompleted(mVibration.id, status);
+            }
         } finally {
             Trace.traceEnd(Trace.TRACE_TAG_VIBRATOR);
         }
@@ -260,12 +306,9 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             segmentIndex = effect.getRepeatIndex();
         }
         if (segmentIndex < 0) {
-            if (vibratorOffTimeout > SystemClock.uptimeMillis()) {
-                // No more segments to play, last step is to wait for the vibrator to complete
-                return new OffStep(vibratorOffTimeout, controller);
-            } else {
-                return null;
-            }
+            // No more segments to play, last step is to complete the vibration on this vibrator.
+            return new CompleteStep(startTime, /* cancelled= */ false, controller,
+                    vibratorOffTimeout);
         }
 
         VibrationEffectSegment segment = effect.getSegments().get(segmentIndex);
@@ -299,8 +342,18 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         @GuardedBy("mLock")
         private final Queue<Step> mPendingOnVibratorCompleteSteps = new LinkedList<>();
 
+        @GuardedBy("mLock")
+        private int mPendingVibrateSteps;
+        @GuardedBy("mLock")
+        private int mConsumedStartVibrateSteps;
+        @GuardedBy("mLock")
+        private int mSuccessfulVibratorOnSteps;
+
         public void offer(@NonNull Step step) {
             synchronized (mLock) {
+                if (!step.isCleanUp()) {
+                    mPendingVibrateSteps++;
+                }
                 mNextSteps.offer(step);
             }
         }
@@ -311,6 +364,24 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             }
         }
 
+        /**
+         * Calculate the {@link Vibration.Status} based on the current queue state and the expected
+         * number of {@link StartVibrateStep} to be played.
+         */
+        public Vibration.Status calculateVibrationStatus(int expectedStartVibrateSteps) {
+            synchronized (mLock) {
+                if (mPendingVibrateSteps > 0
+                        || mConsumedStartVibrateSteps < expectedStartVibrateSteps) {
+                    return Vibration.Status.RUNNING;
+                }
+                if (mSuccessfulVibratorOnSteps > 0) {
+                    return Vibration.Status.FINISHED;
+                }
+                // If no step was able to turn the vibrator ON successfully.
+                return Vibration.Status.IGNORED_UNSUPPORTED;
+            }
+        }
+
         /** Returns the time in millis to wait before calling {@link #consumeNext()}. */
         public long calculateWaitTime() {
             Step nextStep;
@@ -330,18 +401,28 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
          *
          * @return the number of steps played
          */
-        public int consumeNext() {
+        public void consumeNext() {
             Step nextStep = pollNext();
             if (nextStep != null) {
                 // This might turn on the vibrator and have a HAL latency. Execute this outside any
                 // lock to avoid blocking other interactions with the thread.
                 List<Step> nextSteps = nextStep.play();
                 synchronized (mLock) {
+                    if (nextStep.getVibratorOnDuration() > 0) {
+                        mSuccessfulVibratorOnSteps++;
+                    }
+                    if (nextStep instanceof StartVibrateStep) {
+                        mConsumedStartVibrateSteps++;
+                    }
+                    if (!nextStep.isCleanUp()) {
+                        mPendingVibrateSteps--;
+                    }
+                    for (int i = 0; i < nextSteps.size(); i++) {
+                        mPendingVibrateSteps += nextSteps.get(i).isCleanUp() ? 0 : 1;
+                    }
                     mNextSteps.addAll(nextSteps);
                 }
-                return 1;
             }
-            return 0;
         }
 
         /**
@@ -368,16 +449,38 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         }
 
         /**
-         * Cancel the current queue, clearing all remaining steps.
+         * Cancel the current queue, replacing all remaining steps with respective clean-up steps.
          *
-         * <p>This will remove and trigger {@link Step#cancel()} in all steps, in order.
+         * <p>This will remove all steps and replace them with respective
+         * {@link Step#cancel()}.
          */
         public void cancel() {
+            List<Step> cleanUpSteps = new ArrayList<>();
+            Step step;
+            while ((step = pollNext()) != null) {
+                cleanUpSteps.addAll(step.cancel());
+            }
+            synchronized (mLock) {
+                // All steps generated by Step.cancel() should be clean-up steps.
+                mPendingVibrateSteps = 0;
+                mNextSteps.addAll(cleanUpSteps);
+            }
+        }
+
+        /**
+         * Cancel the current queue immediately, clearing all remaining steps and skipping clean-up.
+         *
+         * <p>This will remove and trigger {@link Step#cancelImmediately()} in all steps, in order.
+         */
+        public void cancelImmediately() {
             Step step;
             while ((step = pollNext()) != null) {
                 // This might turn off the vibrator and have a HAL latency. Execute this outside
                 // any lock to avoid blocking other interactions with the thread.
-                step.cancel();
+                step.cancelImmediately();
+            }
+            synchronized (mLock) {
+                mPendingVibrateSteps = 0;
             }
         }
 
@@ -406,12 +509,37 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             this.startTime = startTime;
         }
 
+        /**
+         * Returns true if this step is a clean up step and not part of a {@link VibrationEffect} or
+         * {@link CombinedVibration}.
+         */
+        public boolean isCleanUp() {
+            return false;
+        }
+
         /** Play this step, returning a (possibly empty) list of next steps. */
         @NonNull
         public abstract List<Step> play();
 
-        /** Cancel this pending step. */
-        public void cancel() {
+        /**
+         * Cancel this pending step and return a (possibly empty) list of clean-up steps that should
+         * be played to gracefully cancel this step.
+         */
+        @NonNull
+        public abstract List<Step> cancel();
+
+        /** Cancel this pending step immediately, skipping any clean-up. */
+        public abstract void cancelImmediately();
+
+        /**
+         * Return the duration the vibrator was turned on when this step was played.
+         *
+         * @return A positive duration that the vibrator was turned on for by this step;
+         * Zero if the segment is not supported, the step was not played yet or vibrator was never
+         * turned on by this step; A negative value if the vibrator call has failed.
+         */
+        public long getVibratorOnDuration() {
+            return 0;
         }
 
         /**
@@ -452,6 +580,8 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         public final CombinedVibration.Sequential sequentialEffect;
         public final int currentIndex;
 
+        private long mVibratorsOnMaxDuration;
+
         StartVibrateStep(CombinedVibration.Sequential effect) {
             this(SystemClock.uptimeMillis() + effect.getDelays().get(0), effect, /* index= */ 0);
         }
@@ -462,11 +592,16 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             currentIndex = index;
         }
 
+        @Override
+        public long getVibratorOnDuration() {
+            return mVibratorsOnMaxDuration;
+        }
+
         @Override
         public List<Step> play() {
             Trace.traceBegin(Trace.TRACE_TAG_VIBRATOR, "StartVibrateStep");
             List<Step> nextSteps = new ArrayList<>();
-            long duration = -1;
+            mVibratorsOnMaxDuration = -1;
             try {
                 if (DEBUG) {
                     Slog.d(TAG, "StartVibrateStep for effect #" + currentIndex);
@@ -478,25 +613,33 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
                     return nextSteps;
                 }
 
-                duration = startVibrating(effectMapping, nextSteps);
-                noteVibratorOn(duration);
+                mVibratorsOnMaxDuration = startVibrating(effectMapping, nextSteps);
+                noteVibratorOn(mVibratorsOnMaxDuration);
             } finally {
-                if (duration < 0) {
-                    // Something failed while playing this step so stop playing this sequence.
-                    return EMPTY_STEP_LIST;
-                }
-                // It least one vibrator was started then add a finish step to wait for all
-                // active vibrators to finish their individual steps before going to the next.
-                // Otherwise this step was ignored so just go to the next one.
-                Step nextStep = duration > 0 ? new FinishVibrateStep(this) : nextStep();
-                if (nextStep != null) {
-                    nextSteps.add(nextStep);
+                if (mVibratorsOnMaxDuration >= 0) {
+                    // It least one vibrator was started then add a finish step to wait for all
+                    // active vibrators to finish their individual steps before going to the next.
+                    // Otherwise this step was ignored so just go to the next one.
+                    Step nextStep =
+                            mVibratorsOnMaxDuration > 0 ? new FinishVibrateStep(this) : nextStep();
+                    if (nextStep != null) {
+                        nextSteps.add(nextStep);
+                    }
                 }
                 Trace.traceEnd(Trace.TRACE_TAG_VIBRATOR);
             }
             return nextSteps;
         }
 
+        @Override
+        public List<Step> cancel() {
+            return EMPTY_STEP_LIST;
+        }
+
+        @Override
+        public void cancelImmediately() {
+        }
+
         /**
          * Create the next {@link StartVibrateStep} to play this sequential effect, starting at the
          * time this method is called, or null if sequence is complete.
@@ -593,7 +736,7 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
                         // Some vibrator failed without being prepared so other vibrators might be
                         // active. Cancel and remove every pending step from output list.
                         for (int i = nextSteps.size() - 1; i >= 0; i--) {
-                            nextSteps.remove(i).cancel();
+                            nextSteps.remove(i).cancelImmediately();
                         }
                     }
                 }
@@ -626,6 +769,12 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             this.startedStep = startedStep;
         }
 
+        @Override
+        public boolean isCleanUp() {
+            // This step only notes that all the vibrators has been turned off.
+            return true;
+        }
+
         @Override
         public List<Step> play() {
             Trace.traceBegin(Trace.TRACE_TAG_VIBRATOR, "FinishVibrateStep");
@@ -642,7 +791,13 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         }
 
         @Override
-        public void cancel() {
+        public List<Step> cancel() {
+            cancelImmediately();
+            return EMPTY_STEP_LIST;
+        }
+
+        @Override
+        public void cancelImmediately() {
             noteVibratorOff();
         }
     }
@@ -658,6 +813,7 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         public final long vibratorOffTimeout;
 
         long mVibratorOnResult;
+        boolean mVibratorCallbackReceived;
 
         /**
          * @param startTime          The time to schedule this step in the {@link StepQueue}.
@@ -678,27 +834,28 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             this.vibratorOffTimeout = vibratorOffTimeout;
         }
 
-        /**
-         * Return the duration the vibrator was turned on when this step was played.
-         *
-         * @return A positive duration that the vibrator was turned on for by this step;
-         * Zero if the segment is not supported, the step was not played yet or vibrator was never
-         * turned on by this step; A negative value if the vibrator call has failed.
-         */
+        @Override
         public long getVibratorOnDuration() {
             return mVibratorOnResult;
         }
 
         @Override
         public boolean shouldPlayWhenVibratorComplete(int vibratorId) {
+            boolean isSameVibrator = controller.getVibratorInfo().getId() == vibratorId;
+            mVibratorCallbackReceived |= isSameVibrator;
             // Only anticipate this step if a timeout was set to wait for the vibration to complete,
             // otherwise we are waiting for the correct time to play the next step.
-            return (controller.getVibratorInfo().getId() == vibratorId)
-                    && (vibratorOffTimeout > SystemClock.uptimeMillis());
+            return isSameVibrator && (vibratorOffTimeout > SystemClock.uptimeMillis());
         }
 
         @Override
-        public void cancel() {
+        public List<Step> cancel() {
+            return Arrays.asList(new CompleteStep(SystemClock.uptimeMillis(),
+                    /* cancelled= */ true, controller, vibratorOffTimeout));
+        }
+
+        @Override
+        public void cancelImmediately() {
             if (vibratorOffTimeout > SystemClock.uptimeMillis()) {
                 // Vibrator might be running from previous steps, so turn it off while canceling.
                 stopVibrating();
@@ -712,6 +869,14 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             controller.off();
         }
 
+        void changeAmplitude(float amplitude) {
+            if (DEBUG) {
+                Slog.d(TAG, "Amplitude changed on vibrator " + controller.getVibratorInfo().getId()
+                        + " to " + amplitude);
+            }
+            controller.setAmplitude(amplitude);
+        }
+
         /** Return the {@link #nextVibrateStep} with same timings, only jumping the segments. */
         public List<Step> skipToNextSteps(int segmentsSkipped) {
             return nextSteps(startTime, vibratorOffTimeout, segmentsSkipped);
@@ -937,6 +1102,140 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
         }
     }
 
+    /**
+     * Represents a step to complete a {@link VibrationEffect}.
+     *
+     * <p>This runs right at the time the vibration is considered to end and will update the pending
+     * vibrators count. This can turn off the vibrator or slowly ramp it down to zero amplitude.
+     */
+    private final class CompleteStep extends SingleVibratorStep {
+        private final boolean mCancelled;
+
+        CompleteStep(long startTime, boolean cancelled, VibratorController controller,
+                long vibratorOffTimeout) {
+            super(startTime, controller, /* effect= */ null, /* index= */ -1, vibratorOffTimeout);
+            mCancelled = cancelled;
+        }
+
+        @Override
+        public boolean isCleanUp() {
+            // If the vibration was cancelled then this is just a clean up to ramp off the vibrator.
+            // Otherwise this step is part of the vibration.
+            return mCancelled;
+        }
+
+        @Override
+        public List<Step> cancel() {
+            if (mCancelled) {
+                // Double cancelling will just turn off the vibrator right away.
+                return Arrays.asList(new OffStep(SystemClock.uptimeMillis(), controller));
+            }
+            return super.cancel();
+        }
+
+        @Override
+        public List<Step> play() {
+            Trace.traceBegin(Trace.TRACE_TAG_VIBRATOR, "CompleteStep");
+            try {
+                if (DEBUG) {
+                    Slog.d(TAG, "Running " + (mCancelled ? "cancel" : "complete") + " vibration"
+                            + " step on vibrator " + controller.getVibratorInfo().getId());
+                }
+                if (mVibratorCallbackReceived) {
+                    // Vibration completion callback was received by this step, just turn if off
+                    // and skip any clean-up.
+                    stopVibrating();
+                    return EMPTY_STEP_LIST;
+                }
+
+                float currentAmplitude = controller.getCurrentAmplitude();
+                long remainingOnDuration =
+                        vibratorOffTimeout - CALLBACKS_EXTRA_TIMEOUT - SystemClock.uptimeMillis();
+                long rampDownDuration =
+                        Math.min(remainingOnDuration, mVibrationSettings.getRampDownDuration());
+                long stepDownDuration = mVibrationSettings.getRampStepDuration();
+                if (currentAmplitude < RAMP_OFF_AMPLITUDE_MIN
+                        || rampDownDuration <= stepDownDuration) {
+                    // No need to ramp down the amplitude, just wait to turn it off.
+                    if (mCancelled) {
+                        // Vibration is completing because it was cancelled, turn off right away.
+                        stopVibrating();
+                        return EMPTY_STEP_LIST;
+                    } else {
+                        return Arrays.asList(new OffStep(vibratorOffTimeout, controller));
+                    }
+                }
+
+                if (DEBUG) {
+                    Slog.d(TAG, "Ramping down vibrator " + controller.getVibratorInfo().getId()
+                            + " from amplitude " + currentAmplitude
+                            + " for " + rampDownDuration + "ms");
+                }
+                float amplitudeDelta = currentAmplitude / (rampDownDuration / stepDownDuration);
+                float amplitudeTarget = currentAmplitude - amplitudeDelta;
+                long newVibratorOffTimeout = mCancelled ? rampDownDuration : vibratorOffTimeout;
+                return Arrays.asList(new RampOffStep(startTime, amplitudeTarget, amplitudeDelta,
+                        controller, newVibratorOffTimeout));
+            } finally {
+                Trace.traceEnd(Trace.TRACE_TAG_VIBRATOR);
+            }
+        }
+    }
+
+    /** Represents a step to ramp down the vibrator amplitude before turning it off. */
+    private final class RampOffStep extends SingleVibratorStep {
+        private final float mAmplitudeTarget;
+        private final float mAmplitudeDelta;
+
+        RampOffStep(long startTime, float amplitudeTarget, float amplitudeDelta,
+                VibratorController controller, long vibratorOffTimeout) {
+            super(startTime, controller, /* effect= */ null, /* index= */ -1, vibratorOffTimeout);
+            mAmplitudeTarget = amplitudeTarget;
+            mAmplitudeDelta = amplitudeDelta;
+        }
+
+        @Override
+        public boolean isCleanUp() {
+            return true;
+        }
+
+        @Override
+        public List<Step> cancel() {
+            return Arrays.asList(new OffStep(SystemClock.uptimeMillis(), controller));
+        }
+
+        @Override
+        public List<Step> play() {
+            Trace.traceBegin(Trace.TRACE_TAG_VIBRATOR, "RampOffStep");
+            try {
+                if (DEBUG) {
+                    long latency = SystemClock.uptimeMillis() - startTime;
+                    Slog.d(TAG, "Ramp down the vibrator amplitude, step with "
+                            + latency + "ms latency.");
+                }
+                if (mVibratorCallbackReceived) {
+                    // Vibration completion callback was received by this step, just turn if off
+                    // and skip the rest of the steps to ramp down the vibrator amplitude.
+                    stopVibrating();
+                    return EMPTY_STEP_LIST;
+                }
+
+                changeAmplitude(mAmplitudeTarget);
+
+                float newAmplitudeTarget = mAmplitudeTarget - mAmplitudeDelta;
+                if (newAmplitudeTarget < RAMP_OFF_AMPLITUDE_MIN) {
+                    // Vibrator amplitude cannot go further down, just turn it off.
+                    return Arrays.asList(new OffStep(vibratorOffTimeout, controller));
+                }
+                return Arrays.asList(new RampOffStep(
+                        startTime + mVibrationSettings.getRampStepDuration(), newAmplitudeTarget,
+                        mAmplitudeDelta, controller, vibratorOffTimeout));
+            } finally {
+                Trace.traceEnd(Trace.TRACE_TAG_VIBRATOR);
+            }
+        }
+    }
+
     /**
      * Represents a step to turn the vibrator off.
      *
@@ -949,6 +1248,21 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             super(startTime, controller, /* effect= */ null, /* index= */ -1, startTime);
         }
 
+        @Override
+        public boolean isCleanUp() {
+            return true;
+        }
+
+        @Override
+        public List<Step> cancel() {
+            return Arrays.asList(new OffStep(SystemClock.uptimeMillis(), controller));
+        }
+
+        @Override
+        public void cancelImmediately() {
+            stopVibrating();
+        }
+
         @Override
         public List<Step> play() {
             Trace.traceBegin(Trace.TRACE_TAG_VIBRATOR, "OffStep");
@@ -1044,14 +1358,6 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
             return controller.on(duration, mVibration.id);
         }
 
-        private void changeAmplitude(float amplitude) {
-            if (DEBUG) {
-                Slog.d(TAG, "Amplitude changed on vibrator " + controller.getVibratorInfo().getId()
-                        + " to " + amplitude);
-            }
-            controller.setAmplitude(amplitude);
-        }
-
         /**
          * Get the duration the vibrator will be on for a waveform, starting at {@code startIndex}
          * until the next time it's vibrating amplitude is zero or a different type of segment is
@@ -1080,6 +1386,11 @@ final class VibrationThread extends Thread implements IBinder.DeathRecipient {
                     return 1000;
                 }
             }
+            if (i == segmentCount && effect.getRepeatIndex() < 0) {
+                // Vibration ending at non-zero amplitude, add extra timings to ramp down after
+                // vibration is complete.
+                timing += mVibrationSettings.getRampDownDuration();
+            }
             return timing;
         }
     }
diff --git a/services/core/java/com/android/server/vibrator/VibratorController.java b/services/core/java/com/android/server/vibrator/VibratorController.java
index 001d5c440d587..69cc90bf381ec 100644
--- a/services/core/java/com/android/server/vibrator/VibratorController.java
+++ b/services/core/java/com/android/server/vibrator/VibratorController.java
@@ -54,6 +54,8 @@ final class VibratorController {
     private boolean mIsVibrating;
     @GuardedBy("mLock")
     private boolean mIsUnderExternalControl;
+    @GuardedBy("mLock")
+    private float mCurrentAmplitude;
 
     /** Listener for vibration completion callbacks from native. */
     public interface OnVibrationCompleteListener {
@@ -131,6 +133,23 @@ final class VibratorController {
         }
     }
 
+    /**
+     * Returns the current amplitude the device is vibrating.
+     *
+     * <p>This value is set to 1 by the method {@link #on(long, long)}, and can be updated via
+     * {@link #setAmplitude(float)} if called while the device is vibrating.
+     *
+     * <p>If the device is vibrating via any other {@link #on} method then the current amplitude is
+     * unknown and this will return -1.
+     *
+     * <p>If {@link #isVibrating()} is false then this will be zero.
+     */
+    public float getCurrentAmplitude() {
+        synchronized (mLock) {
+            return mCurrentAmplitude;
+        }
+    }
+
     /** Return {@code true} if this vibrator is under external control, false otherwise. */
     public boolean isUnderExternalControl() {
         synchronized (mLock) {
@@ -192,6 +211,9 @@ final class VibratorController {
             if (mVibratorInfo.hasCapability(IVibrator.CAP_AMPLITUDE_CONTROL)) {
                 mNativeWrapper.setAmplitude(amplitude);
             }
+            if (mIsVibrating) {
+                mCurrentAmplitude = amplitude;
+            }
         }
     }
 
@@ -208,6 +230,7 @@ final class VibratorController {
         synchronized (mLock) {
             long duration = mNativeWrapper.on(milliseconds, vibrationId);
             if (duration > 0) {
+                mCurrentAmplitude = -1;
                 notifyVibratorOnLocked();
             }
             return duration;
@@ -228,6 +251,7 @@ final class VibratorController {
             long duration = mNativeWrapper.perform(prebaked.getEffectId(),
                     prebaked.getEffectStrength(), vibrationId);
             if (duration > 0) {
+                mCurrentAmplitude = -1;
                 notifyVibratorOnLocked();
             }
             return duration;
@@ -250,6 +274,7 @@ final class VibratorController {
         synchronized (mLock) {
             long duration = mNativeWrapper.compose(primitives, vibrationId);
             if (duration > 0) {
+                mCurrentAmplitude = -1;
                 notifyVibratorOnLocked();
             }
             return duration;
@@ -272,6 +297,7 @@ final class VibratorController {
             int braking = mVibratorInfo.getDefaultBraking();
             long duration = mNativeWrapper.composePwle(primitives, braking, vibrationId);
             if (duration > 0) {
+                mCurrentAmplitude = -1;
                 notifyVibratorOnLocked();
             }
             return duration;
@@ -282,19 +308,23 @@ final class VibratorController {
     public void off() {
         synchronized (mLock) {
             mNativeWrapper.off();
+            mCurrentAmplitude = 0;
             notifyVibratorOffLocked();
         }
     }
 
     @Override
     public String toString() {
-        return "VibratorController{"
-                + "mVibratorInfo=" + mVibratorInfo
-                + ", mIsVibrating=" + mIsVibrating
-                + ", mIsUnderExternalControl=" + mIsUnderExternalControl
-                + ", mVibratorStateListeners count="
-                + mVibratorStateListeners.getRegisteredCallbackCount()
-                + '}';
+        synchronized (mLock) {
+            return "VibratorController{"
+                    + "mVibratorInfo=" + mVibratorInfo
+                    + ", mIsVibrating=" + mIsVibrating
+                    + ", mCurrentAmplitude=" + mCurrentAmplitude
+                    + ", mIsUnderExternalControl=" + mIsUnderExternalControl
+                    + ", mVibratorStateListeners count="
+                    + mVibratorStateListeners.getRegisteredCallbackCount()
+                    + '}';
+        }
     }
 
     @GuardedBy("mLock")
diff --git a/services/core/java/com/android/server/vibrator/VibratorManagerService.java b/services/core/java/com/android/server/vibrator/VibratorManagerService.java
index 644e451ce0e8a..fb8498ec73c1e 100644
--- a/services/core/java/com/android/server/vibrator/VibratorManagerService.java
+++ b/services/core/java/com/android/server/vibrator/VibratorManagerService.java
@@ -514,8 +514,9 @@ public class VibratorManagerService extends IVibratorManagerService.Stub {
                 return Vibration.Status.FORWARDED_TO_INPUT_DEVICES;
             }
 
-            VibrationThread vibThread = new VibrationThread(vib, mDeviceVibrationEffectAdapter,
-                    mVibrators, mWakeLock, mBatteryStatsService, mVibrationCallbacks);
+            VibrationThread vibThread = new VibrationThread(vib, mVibrationSettings,
+                    mDeviceVibrationEffectAdapter, mVibrators, mWakeLock, mBatteryStatsService,
+                    mVibrationCallbacks);
 
             if (mCurrentVibration == null) {
                 return startVibrationThreadLocked(vibThread);
@@ -569,7 +570,6 @@ public class VibratorManagerService extends IVibratorManagerService.Stub {
         Trace.asyncTraceEnd(Trace.TRACE_TAG_VIBRATOR, "vibration", 0);
         try {
             Vibration vib = mCurrentVibration.getVibration();
-            mCurrentVibration = null;
             endVibrationLocked(vib, status);
             finishAppOpModeLocked(vib.uid, vib.opPkg);
         } finally {
@@ -613,7 +613,7 @@ public class VibratorManagerService extends IVibratorManagerService.Stub {
             // Repeating vibrations always take precedence.
             return null;
         }
-        if (mCurrentVibration != null) {
+        if (mCurrentVibration != null && !mCurrentVibration.getVibration().hasEnded()) {
             if (mCurrentVibration.getVibration().attrs.getUsage()
                     == VibrationAttributes.USAGE_ALARM) {
                 if (DEBUG) {
@@ -1003,20 +1003,29 @@ public class VibratorManagerService extends IVibratorManagerService.Stub {
         }
 
         @Override
-        public void onVibrationEnded(long vibrationId, Vibration.Status status) {
+        public void onVibrationCompleted(long vibrationId, Vibration.Status status) {
             if (DEBUG) {
-                Slog.d(TAG, "Vibration " + vibrationId + " thread finished with status " + status);
+                Slog.d(TAG, "Vibration " + vibrationId + " finished with status " + status);
             }
             synchronized (mLock) {
                 if (mCurrentVibration != null
                         && mCurrentVibration.getVibration().id == vibrationId) {
                     reportFinishedVibrationLocked(status);
+                }
+            }
+        }
 
-                    if (mNextVibration != null) {
-                        VibrationThread vibThread = mNextVibration;
-                        mNextVibration = null;
-                        startVibrationThreadLocked(vibThread);
-                    }
+        @Override
+        public void onVibratorsReleased() {
+            if (DEBUG) {
+                Slog.d(TAG, "Vibrators released after finished vibration");
+            }
+            synchronized (mLock) {
+                mCurrentVibration = null;
+                if (mNextVibration != null) {
+                    VibrationThread vibThread = mNextVibration;
+                    mNextVibration = null;
+                    startVibrationThreadLocked(vibThread);
                 }
             }
         }
@@ -1337,7 +1346,7 @@ public class VibratorManagerService extends IVibratorManagerService.Stub {
                     // vibration that may be playing and ready the vibrator for external control.
                     if (mCurrentVibration != null) {
                         mNextVibration = null;
-                        mCurrentVibration.cancel();
+                        mCurrentVibration.cancelImmediately();
                         cancelingVibration = mCurrentVibration;
                     }
                 } else {
diff --git a/services/tests/servicestests/src/com/android/server/vibrator/VibrationThreadTest.java b/services/tests/servicestests/src/com/android/server/vibrator/VibrationThreadTest.java
index 6d25e8c55a517..1596483cdbe15 100644
--- a/services/tests/servicestests/src/com/android/server/vibrator/VibrationThreadTest.java
+++ b/services/tests/servicestests/src/com/android/server/vibrator/VibrationThreadTest.java
@@ -27,6 +27,7 @@ import static org.mockito.ArgumentMatchers.same;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.inOrder;
 import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.timeout;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -86,6 +87,7 @@ public class VibrationThreadTest {
     private static final int VIBRATOR_ID = 1;
     private static final String PACKAGE_NAME = "package";
     private static final VibrationAttributes ATTRS = new VibrationAttributes.Builder().build();
+    private static final int TEST_RAMP_STEP_DURATION = 5;
 
     @Rule
     public MockitoRule mMockitoRule = MockitoJUnit.rule();
@@ -100,6 +102,7 @@ public class VibrationThreadTest {
     private IBatteryStats mIBatteryStatsMock;
 
     private final Map<Integer, FakeVibratorControllerProvider> mVibratorProviders = new HashMap<>();
+    private VibrationSettings mVibrationSettings;
     private DeviceVibrationEffectAdapter mEffectAdapter;
     private PowerManager.WakeLock mWakeLock;
     private TestLooper mTestLooper;
@@ -109,9 +112,9 @@ public class VibrationThreadTest {
         mTestLooper = new TestLooper();
 
         Context context = InstrumentationRegistry.getContext();
-        VibrationSettings vibrationSettings = new VibrationSettings(context,
-                new Handler(mTestLooper.getLooper()));
-        mEffectAdapter = new DeviceVibrationEffectAdapter(vibrationSettings);
+        mVibrationSettings = new VibrationSettings(context, new Handler(mTestLooper.getLooper()),
+                /* rampDownDuration= */ 0, TEST_RAMP_STEP_DURATION);
+        mEffectAdapter = new DeviceVibrationEffectAdapter(mVibrationSettings);
         mWakeLock = context.getSystemService(
                 PowerManager.class).newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "*vibrator*");
 
@@ -128,8 +131,7 @@ public class VibrationThreadTest {
         waitForCompletion(thread);
 
         verify(mControllerCallbacks, never()).onComplete(anyInt(), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId),
-                eq(Vibration.Status.IGNORED_UNSUPPORTED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.IGNORED_UNSUPPORTED);
     }
 
     @Test
@@ -143,8 +145,7 @@ public class VibrationThreadTest {
         waitForCompletion(thread);
 
         verify(mControllerCallbacks, never()).onComplete(anyInt(), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId),
-                eq(Vibration.Status.IGNORED_UNSUPPORTED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.IGNORED_UNSUPPORTED);
     }
 
     @Test
@@ -159,7 +160,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(10L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
         assertEquals(Arrays.asList(expectedOneShot(10)),
@@ -178,7 +179,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(10L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
         assertEquals(Arrays.asList(expectedOneShot(10)),
@@ -200,7 +201,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(15L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
         assertEquals(Arrays.asList(expectedOneShot(15)),
@@ -232,7 +233,7 @@ public class VibrationThreadTest {
 
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), anyLong());
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
         List<Float> playedAmplitudes = fakeVibrator.getAmplitudes();
@@ -269,7 +270,7 @@ public class VibrationThreadTest {
         waitForCompletion(vibrationThread, /* timeout= */ 50);
         waitForCompletion(cancellingThread);
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
         assertFalse(vibrationThread.getVibrators().get(VIBRATOR_ID).isVibrating());
     }
 
@@ -294,7 +295,7 @@ public class VibrationThreadTest {
         waitForCompletion(vibrationThread, /* timeout= */ 50);
         waitForCompletion(cancellingThread);
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
         assertFalse(vibrationThread.getVibrators().get(VIBRATOR_ID).isVibrating());
     }
 
@@ -310,7 +311,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(20L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
         assertEquals(Arrays.asList(expectedPrebaked(VibrationEffect.EFFECT_THUD)),
@@ -333,7 +334,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(10L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
         assertEquals(Arrays.asList(expectedOneShot(10)),
@@ -352,8 +353,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock, never()).noteVibratorOn(eq(UID), anyLong());
         verify(mIBatteryStatsMock, never()).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks, never()).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId),
-                eq(Vibration.Status.IGNORED_UNSUPPORTED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.IGNORED_UNSUPPORTED);
         assertTrue(mVibratorProviders.get(VIBRATOR_ID).getEffectSegments().isEmpty());
     }
 
@@ -373,7 +373,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(40L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
         assertEquals(Arrays.asList(
                 expectedPrimitive(VibrationEffect.Composition.PRIMITIVE_CLICK, 1, 0),
@@ -393,8 +393,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock, never()).noteVibratorOn(eq(UID), anyLong());
         verify(mIBatteryStatsMock, never()).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks, never()).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId),
-                eq(Vibration.Status.IGNORED_UNSUPPORTED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.IGNORED_UNSUPPORTED);
         assertTrue(mVibratorProviders.get(VIBRATOR_ID).getEffectSegments().isEmpty());
     }
 
@@ -413,7 +412,7 @@ public class VibrationThreadTest {
         VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
         waitForCompletion(thread);
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         // Vibrator compose called twice.
         verify(mControllerCallbacks, times(2)).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
         assertEquals(3, fakeVibrator.getEffectSegments().size());
@@ -443,7 +442,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(10L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks, times(4)).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
         assertEquals(Arrays.asList(
                 expectedOneShot(10),
@@ -479,7 +478,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(100L));
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
         assertEquals(Arrays.asList(
                 expectedRamp(/* amplitude= */ 1, /* frequency= */ 150, /* duration= */ 10),
@@ -512,7 +511,7 @@ public class VibrationThreadTest {
         VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
         waitForCompletion(thread);
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         // Vibrator compose called twice.
         verify(mControllerCallbacks, times(2)).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
         assertEquals(4, fakeVibrator.getEffectSegments().size());
@@ -537,7 +536,7 @@ public class VibrationThreadTest {
         waitForCompletion(thread);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
     }
 
     @Test
@@ -545,10 +544,10 @@ public class VibrationThreadTest {
         mVibratorProviders.get(1).setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL);
 
         long vibrationId = 1;
-        waitForCompletion(startThreadAndDispatcher(vibrationId++,
+        waitForCompletion(startThreadAndDispatcher(vibrationId,
                 VibrationEffect.createOneShot(10, 100)));
 
-        verify(mThreadCallbacks).onVibrationEnded(anyLong(), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         verify(mThreadCallbacks, never()).prepareSyncedVibration(anyLong(), any());
         verify(mThreadCallbacks, never()).triggerSyncedVibration(anyLong());
         verify(mThreadCallbacks, never()).cancelSyncedVibration();
@@ -571,7 +570,7 @@ public class VibrationThreadTest {
         verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
         verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
         verify(mControllerCallbacks, never()).onComplete(eq(2), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
 
         assertEquals(Arrays.asList(expectedPrebaked(VibrationEffect.EFFECT_TICK)),
@@ -596,7 +595,7 @@ public class VibrationThreadTest {
         verify(mControllerCallbacks).onComplete(eq(1), eq(vibrationId));
         verify(mControllerCallbacks).onComplete(eq(2), eq(vibrationId));
         verify(mControllerCallbacks).onComplete(eq(3), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(1).isVibrating());
         assertFalse(thread.getVibrators().get(2).isVibrating());
         assertFalse(thread.getVibrators().get(3).isVibrating());
@@ -635,7 +634,7 @@ public class VibrationThreadTest {
         verify(mControllerCallbacks).onComplete(eq(2), eq(vibrationId));
         verify(mControllerCallbacks).onComplete(eq(3), eq(vibrationId));
         verify(mControllerCallbacks).onComplete(eq(4), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(1).isVibrating());
         assertFalse(thread.getVibrators().get(2).isVibrating());
         assertFalse(thread.getVibrators().get(3).isVibrating());
@@ -686,7 +685,7 @@ public class VibrationThreadTest {
         batterVerifier.verify(mIBatteryStatsMock).noteVibratorOn(eq(UID), eq(20L));
         batterVerifier.verify(mIBatteryStatsMock).noteVibratorOff(eq(UID));
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(1).isVibrating());
         assertFalse(thread.getVibrators().get(2).isVibrating());
         assertFalse(thread.getVibrators().get(3).isVibrating());
@@ -727,7 +726,7 @@ public class VibrationThreadTest {
         verify(mThreadCallbacks).prepareSyncedVibration(eq(expectedCap), eq(vibratorIds));
         verify(mThreadCallbacks).triggerSyncedVibration(eq(vibrationId));
         verify(mThreadCallbacks, never()).cancelSyncedVibration();
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
 
         VibrationEffectSegment expected = expectedPrimitive(
                 VibrationEffect.Composition.PRIMITIVE_CLICK, 1, 100);
@@ -767,7 +766,7 @@ public class VibrationThreadTest {
         verify(mThreadCallbacks).prepareSyncedVibration(eq(expectedCap), eq(vibratorIds));
         verify(mThreadCallbacks).triggerSyncedVibration(eq(vibrationId));
         verify(mThreadCallbacks, never()).cancelSyncedVibration();
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
     }
 
     @Test
@@ -858,7 +857,7 @@ public class VibrationThreadTest {
         verify(mControllerCallbacks).onComplete(eq(1), eq(vibrationId));
         verify(mControllerCallbacks).onComplete(eq(2), eq(vibrationId));
         verify(mControllerCallbacks).onComplete(eq(3), eq(vibrationId));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.FINISHED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
         assertFalse(thread.getVibrators().get(1).isVibrating());
         assertFalse(thread.getVibrators().get(2).isVibrating());
         assertFalse(thread.getVibrators().get(3).isVibrating());
@@ -935,7 +934,7 @@ public class VibrationThreadTest {
 
         // After the vibrator call ends the vibration is cancelled and the vibrator is turned off.
         waitForCompletion(vibrationThread, /* timeout= */ latency + TEST_TIMEOUT_MILLIS);
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
         assertFalse(vibrationThread.getVibrators().get(VIBRATOR_ID).isVibrating());
     }
 
@@ -968,7 +967,7 @@ public class VibrationThreadTest {
         waitForCompletion(vibrationThread, /* timeout= */ 50);
         waitForCompletion(cancellingThread);
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
         assertFalse(vibrationThread.getVibrators().get(1).isVibrating());
         assertFalse(vibrationThread.getVibrators().get(2).isVibrating());
     }
@@ -1000,7 +999,7 @@ public class VibrationThreadTest {
         waitForCompletion(vibrationThread, /* timeout= */ 50);
         waitForCompletion(cancellingThread);
 
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
         assertFalse(vibrationThread.getVibrators().get(1).isVibrating());
         assertFalse(vibrationThread.getVibrators().get(2).isVibrating());
     }
@@ -1020,11 +1019,179 @@ public class VibrationThreadTest {
 
         verify(mVibrationToken).linkToDeath(same(thread), eq(0));
         verify(mVibrationToken).unlinkToDeath(same(thread), eq(0));
-        verify(mThreadCallbacks).onVibrationEnded(eq(vibrationId), eq(Vibration.Status.CANCELLED));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
         assertFalse(mVibratorProviders.get(VIBRATOR_ID).getEffectSegments().isEmpty());
         assertFalse(thread.getVibrators().get(VIBRATOR_ID).isVibrating());
     }
 
+    @Test
+    public void vibrate_waveformWithRampDown_addsRampDownAfterVibrationCompleted() {
+        int rampDownDuration = 15;
+        mVibrationSettings = new VibrationSettings(InstrumentationRegistry.getContext(),
+                new Handler(mTestLooper.getLooper()), rampDownDuration, TEST_RAMP_STEP_DURATION);
+        mEffectAdapter = new DeviceVibrationEffectAdapter(mVibrationSettings);
+        mVibratorProviders.get(VIBRATOR_ID).setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL);
+
+        long vibrationId = 1;
+        VibrationEffect effect = VibrationEffect.createWaveform(
+                new long[]{5, 5, 5}, new int[]{60, 120, 240}, -1);
+        VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
+        waitForCompletion(thread);
+
+        verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
+
+        // Duration extended for 5 + 5 + 5 + 15.
+        assertEquals(Arrays.asList(expectedOneShot(30)),
+                mVibratorProviders.get(VIBRATOR_ID).getEffectSegments());
+        List<Float> amplitudes = mVibratorProviders.get(VIBRATOR_ID).getAmplitudes();
+        assertTrue(amplitudes.size() > 3);
+        assertEquals(expectedAmplitudes(60, 120, 240), amplitudes.subList(0, 3));
+        for (int i = 3; i < amplitudes.size(); i++) {
+            assertTrue(amplitudes.get(i) < amplitudes.get(i - 1));
+        }
+    }
+
+    @Test
+    public void vibrate_waveformWithRampDown_triggersCallbackWhenOriginalVibrationEnds() {
+        int rampDownDuration = 10_000;
+        mVibrationSettings = new VibrationSettings(InstrumentationRegistry.getContext(),
+                new Handler(mTestLooper.getLooper()), rampDownDuration, TEST_RAMP_STEP_DURATION);
+        mEffectAdapter = new DeviceVibrationEffectAdapter(mVibrationSettings);
+        mVibratorProviders.get(VIBRATOR_ID).setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL);
+
+        long vibrationId = 1;
+        VibrationEffect effect = VibrationEffect.createOneShot(10, 200);
+        VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
+
+        // Vibration completed but vibrator not yet released.
+        verify(mThreadCallbacks, timeout(TEST_TIMEOUT_MILLIS)).onVibrationCompleted(eq(vibrationId),
+                eq(Vibration.Status.FINISHED));
+        verify(mThreadCallbacks, never()).onVibratorsReleased();
+
+        // Thread still running ramp down.
+        assertTrue(thread.isAlive());
+
+        // Duration extended for 10 + 10000.
+        assertEquals(Arrays.asList(expectedOneShot(10_010)),
+                mVibratorProviders.get(VIBRATOR_ID).getEffectSegments());
+
+        // Will stop the ramp down right away.
+        thread.cancelImmediately();
+        waitForCompletion(thread);
+
+        // Does not cancel already finished vibration, but releases vibrator.
+        verify(mThreadCallbacks, never()).onVibrationCompleted(eq(vibrationId),
+                eq(Vibration.Status.CANCELLED));
+        verify(mThreadCallbacks).onVibratorsReleased();
+    }
+
+    @Test
+    public void vibrate_waveformCancelledWithRampDown_addsRampDownAfterVibrationCancelled()
+            throws Exception {
+        int rampDownDuration = 15;
+        mVibrationSettings = new VibrationSettings(InstrumentationRegistry.getContext(),
+                new Handler(mTestLooper.getLooper()), rampDownDuration, TEST_RAMP_STEP_DURATION);
+        mEffectAdapter = new DeviceVibrationEffectAdapter(mVibrationSettings);
+        mVibratorProviders.get(VIBRATOR_ID).setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL);
+
+        long vibrationId = 1;
+        VibrationEffect effect = VibrationEffect.createOneShot(10_000, 240);
+        VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
+        assertTrue(waitUntil(t -> t.getVibrators().get(VIBRATOR_ID).isVibrating(), thread,
+                TEST_TIMEOUT_MILLIS));
+        thread.cancel();
+        waitForCompletion(thread);
+
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.CANCELLED);
+
+        // Duration extended for 10000 + 15.
+        assertEquals(Arrays.asList(expectedOneShot(10_015)),
+                mVibratorProviders.get(VIBRATOR_ID).getEffectSegments());
+        List<Float> amplitudes = mVibratorProviders.get(VIBRATOR_ID).getAmplitudes();
+        assertTrue(amplitudes.size() > 1);
+        for (int i = 1; i < amplitudes.size(); i++) {
+            assertTrue(amplitudes.get(i) < amplitudes.get(i - 1));
+        }
+    }
+
+    @Test
+    public void vibrate_predefinedWithRampDown_doesNotAddRampDown() {
+        int rampDownDuration = 15;
+        mVibrationSettings = new VibrationSettings(InstrumentationRegistry.getContext(),
+                new Handler(mTestLooper.getLooper()), rampDownDuration, TEST_RAMP_STEP_DURATION);
+        mEffectAdapter = new DeviceVibrationEffectAdapter(mVibrationSettings);
+        mVibratorProviders.get(VIBRATOR_ID).setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL);
+        mVibratorProviders.get(VIBRATOR_ID).setSupportedEffects(VibrationEffect.EFFECT_CLICK);
+
+        long vibrationId = 1;
+        VibrationEffect effect = VibrationEffect.get(VibrationEffect.EFFECT_CLICK);
+        VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
+        waitForCompletion(thread);
+
+        verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
+
+        assertEquals(Arrays.asList(expectedPrebaked(VibrationEffect.EFFECT_CLICK)),
+                mVibratorProviders.get(VIBRATOR_ID).getEffectSegments());
+        assertTrue(mVibratorProviders.get(VIBRATOR_ID).getAmplitudes().isEmpty());
+    }
+
+    @Test
+    public void vibrate_composedWithRampDown_doesNotAddRampDown() {
+        int rampDownDuration = 15;
+        mVibrationSettings = new VibrationSettings(InstrumentationRegistry.getContext(),
+                new Handler(mTestLooper.getLooper()), rampDownDuration, TEST_RAMP_STEP_DURATION);
+        mEffectAdapter = new DeviceVibrationEffectAdapter(mVibrationSettings);
+        mVibratorProviders.get(VIBRATOR_ID).setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL,
+                IVibrator.CAP_COMPOSE_EFFECTS);
+        mVibratorProviders.get(VIBRATOR_ID).setSupportedPrimitives(
+                VibrationEffect.Composition.PRIMITIVE_CLICK);
+
+        long vibrationId = 1;
+        VibrationEffect effect = VibrationEffect.startComposition()
+                .addPrimitive(VibrationEffect.Composition.PRIMITIVE_CLICK)
+                .compose();
+        VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
+        waitForCompletion(thread);
+
+        verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
+
+        assertEquals(
+                Arrays.asList(expectedPrimitive(VibrationEffect.Composition.PRIMITIVE_CLICK, 1, 0)),
+                mVibratorProviders.get(VIBRATOR_ID).getEffectSegments());
+        assertTrue(mVibratorProviders.get(VIBRATOR_ID).getAmplitudes().isEmpty());
+    }
+
+    @Test
+    public void vibrate_pwleWithRampDown_doesNotAddRampDown() {
+        int rampDownDuration = 15;
+        mVibrationSettings = new VibrationSettings(InstrumentationRegistry.getContext(),
+                new Handler(mTestLooper.getLooper()), rampDownDuration, TEST_RAMP_STEP_DURATION);
+        mEffectAdapter = new DeviceVibrationEffectAdapter(mVibrationSettings);
+        FakeVibratorControllerProvider fakeVibrator = mVibratorProviders.get(VIBRATOR_ID);
+        fakeVibrator.setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL,
+                IVibrator.CAP_COMPOSE_PWLE_EFFECTS);
+        fakeVibrator.setMinFrequency(100);
+        fakeVibrator.setResonantFrequency(150);
+        fakeVibrator.setFrequencyResolution(50);
+        fakeVibrator.setMaxAmplitudes(1, 1, 1);
+        fakeVibrator.setPwleSizeMax(2);
+
+        long vibrationId = 1;
+        VibrationEffect effect = VibrationEffect.startWaveform().addRamp(1, 1).build();
+        VibrationThread thread = startThreadAndDispatcher(vibrationId, effect);
+        waitForCompletion(thread);
+
+        verify(mControllerCallbacks).onComplete(eq(VIBRATOR_ID), eq(vibrationId));
+        verifyCallbacksTriggered(vibrationId, Vibration.Status.FINISHED);
+
+        assertEquals(Arrays.asList(expectedRamp(0, 1, 150, 150, 1)),
+                fakeVibrator.getEffectSegments());
+        assertTrue(fakeVibrator.getAmplitudes().isEmpty());
+    }
+
     private void mockVibrators(int... vibratorIds) {
         for (int vibratorId : vibratorIds) {
             mVibratorProviders.put(vibratorId,
@@ -1042,7 +1209,7 @@ public class VibrationThreadTest {
     }
 
     private VibrationThread startThreadAndDispatcher(Vibration vib) {
-        VibrationThread thread = new VibrationThread(vib, mEffectAdapter,
+        VibrationThread thread = new VibrationThread(vib, mVibrationSettings, mEffectAdapter,
                 createVibratorControllers(), mWakeLock, mIBatteryStatsMock, mThreadCallbacks);
         doAnswer(answer -> {
             thread.vibratorComplete(answer.getArgument(0));
@@ -1117,4 +1284,9 @@ public class VibrationThreadTest {
                 .mapToObj(amplitude -> amplitude / 255f)
                 .collect(Collectors.toList());
     }
+
+    private void verifyCallbacksTriggered(long vibrationId, Vibration.Status expectedStatus) {
+        verify(mThreadCallbacks).onVibrationCompleted(eq(vibrationId), eq(expectedStatus));
+        verify(mThreadCallbacks).onVibratorsReleased();
+    }
 }
diff --git a/services/tests/servicestests/src/com/android/server/vibrator/VibratorManagerServiceTest.java b/services/tests/servicestests/src/com/android/server/vibrator/VibratorManagerServiceTest.java
index 9117ae696e9f3..77003b2e091a1 100644
--- a/services/tests/servicestests/src/com/android/server/vibrator/VibratorManagerServiceTest.java
+++ b/services/tests/servicestests/src/com/android/server/vibrator/VibratorManagerServiceTest.java
@@ -67,6 +67,7 @@ import android.os.VibratorInfo;
 import android.os.test.TestLooper;
 import android.os.vibrator.PrebakedSegment;
 import android.os.vibrator.PrimitiveSegment;
+import android.os.vibrator.VibrationEffectSegment;
 import android.platform.test.annotations.Presubmit;
 import android.provider.Settings;
 import android.view.InputDevice;
@@ -470,13 +471,14 @@ public class VibratorManagerServiceTest {
         mockVibrators(1);
         FakeVibratorControllerProvider fakeVibrator = mVibratorProviders.get(1);
         mVibrator.setDefaultRingVibrationIntensity(Vibrator.VIBRATION_INTENSITY_MEDIUM);
-        fakeVibrator.setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL);
+        fakeVibrator.setSupportedEffects(VibrationEffect.EFFECT_CLICK,
+                VibrationEffect.EFFECT_HEAVY_CLICK, VibrationEffect.EFFECT_DOUBLE_CLICK);
 
         setRingerMode(AudioManager.RINGER_MODE_NORMAL);
         setUserSetting(Settings.System.VIBRATE_WHEN_RINGING, 0);
         setGlobalSetting(Settings.Global.APPLY_RAMPING_RINGER, 0);
         VibratorManagerService service = createSystemReadyService();
-        vibrate(service, VibrationEffect.createOneShot(1, 1), RINGTONE_ATTRS);
+        vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_CLICK), RINGTONE_ATTRS);
         // Wait before checking it never played.
         assertFalse(waitUntil(s -> !fakeVibrator.getEffectSegments().isEmpty(),
                 service, /* timeout= */ 50));
@@ -484,43 +486,52 @@ public class VibratorManagerServiceTest {
         setUserSetting(Settings.System.VIBRATE_WHEN_RINGING, 0);
         setGlobalSetting(Settings.Global.APPLY_RAMPING_RINGER, 1);
         service = createSystemReadyService();
-        vibrate(service, VibrationEffect.createOneShot(1, 10), RINGTONE_ATTRS);
+        vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_HEAVY_CLICK), RINGTONE_ATTRS);
         assertTrue(waitUntil(s -> fakeVibrator.getEffectSegments().size() == 1,
                 service, TEST_TIMEOUT_MILLIS));
 
         setUserSetting(Settings.System.VIBRATE_WHEN_RINGING, 1);
         setGlobalSetting(Settings.Global.APPLY_RAMPING_RINGER, 0);
         service = createSystemReadyService();
-        vibrate(service, VibrationEffect.createOneShot(1, 100), RINGTONE_ATTRS);
+        vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_DOUBLE_CLICK), RINGTONE_ATTRS);
         assertTrue(waitUntil(s -> fakeVibrator.getEffectSegments().size() == 2,
                 service, TEST_TIMEOUT_MILLIS));
 
-        assertEquals(Arrays.asList(10 / 255f, 100 / 255f),
-                mVibratorProviders.get(1).getAmplitudes());
+        assertEquals(
+                Arrays.asList(expectedPrebaked(VibrationEffect.EFFECT_HEAVY_CLICK),
+                        expectedPrebaked(VibrationEffect.EFFECT_DOUBLE_CLICK)),
+                mVibratorProviders.get(1).getEffectSegments());
     }
 
     @Test
     public void vibrate_withPowerMode_usesPowerModeState() throws Exception {
         mockVibrators(1);
         FakeVibratorControllerProvider fakeVibrator = mVibratorProviders.get(1);
-        fakeVibrator.setCapabilities(IVibrator.CAP_AMPLITUDE_CONTROL);
+        fakeVibrator.setSupportedEffects(VibrationEffect.EFFECT_TICK, VibrationEffect.EFFECT_CLICK,
+                VibrationEffect.EFFECT_HEAVY_CLICK, VibrationEffect.EFFECT_DOUBLE_CLICK);
         VibratorManagerService service = createSystemReadyService();
         mRegisteredPowerModeListener.onLowPowerModeChanged(LOW_POWER_STATE);
-        vibrate(service, VibrationEffect.createOneShot(1, 1), HAPTIC_FEEDBACK_ATTRS);
-        vibrate(service, VibrationEffect.createOneShot(2, 2), RINGTONE_ATTRS);
+        vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_TICK), HAPTIC_FEEDBACK_ATTRS);
+        vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_CLICK), RINGTONE_ATTRS);
         assertTrue(waitUntil(s -> fakeVibrator.getEffectSegments().size() == 1,
                 service, TEST_TIMEOUT_MILLIS));
 
         mRegisteredPowerModeListener.onLowPowerModeChanged(NORMAL_POWER_STATE);
-        vibrate(service, VibrationEffect.createOneShot(3, 3), /* attributes= */ null);
+        vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_HEAVY_CLICK),
+                /* attrs= */ null);
         assertTrue(waitUntil(s -> fakeVibrator.getEffectSegments().size() == 2,
                 service, TEST_TIMEOUT_MILLIS));
 
-        vibrate(service, VibrationEffect.createOneShot(4, 4), NOTIFICATION_ATTRS);
+        vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_DOUBLE_CLICK),
+                NOTIFICATION_ATTRS);
         assertTrue(waitUntil(s -> fakeVibrator.getEffectSegments().size() == 3,
                 service, TEST_TIMEOUT_MILLIS));
 
-        assertEquals(Arrays.asList(2 / 255f, 3 / 255f, 4 / 255f), fakeVibrator.getAmplitudes());
+        assertEquals(
+                Arrays.asList(expectedPrebaked(VibrationEffect.EFFECT_CLICK),
+                        expectedPrebaked(VibrationEffect.EFFECT_HEAVY_CLICK),
+                        expectedPrebaked(VibrationEffect.EFFECT_DOUBLE_CLICK)),
+                mVibratorProviders.get(1).getEffectSegments());
     }
 
     @Test
@@ -836,7 +847,6 @@ public class VibratorManagerServiceTest {
         vibrate(service, VibrationEffect.get(VibrationEffect.EFFECT_CLICK), RINGTONE_ATTRS);
 
         assertEquals(4, fakeVibrator.getEffectSegments().size());
-        assertEquals(1, fakeVibrator.getAmplitudes().size());
 
         // Notification vibrations will be scaled with SCALE_VERY_HIGH.
         assertTrue(0.6 < fakeVibrator.getAmplitudes().get(0));
@@ -957,6 +967,10 @@ public class VibratorManagerServiceTest {
         assertTrue(waitUntil(s -> !s.isVibrating(1), service, TEST_TIMEOUT_MILLIS));
     }
 
+    private VibrationEffectSegment expectedPrebaked(int effectId) {
+        return new PrebakedSegment(effectId, false, VibrationEffect.EFFECT_STRENGTH_MEDIUM);
+    }
+
     private void mockCapabilities(long... capabilities) {
         when(mNativeWrapperMock.getCapabilities()).thenReturn(
                 Arrays.stream(capabilities).reduce(0, (a, b) -> a | b));