diff --git a/services/inputflinger/InputDispatcher.cpp b/services/inputflinger/InputDispatcher.cpp
index ac17dca..6879a73 100644
--- a/services/inputflinger/InputDispatcher.cpp
+++ b/services/inputflinger/InputDispatcher.cpp
@@ -97,6 +97,9 @@
 // Number of recent events to keep for debugging purposes.
 constexpr size_t RECENT_QUEUE_MAX_SIZE = 10;
 
+// Sequence number for synthesized or injected events.
+constexpr uint32_t SYNTHESIZED_EVENT_SEQUENCE_NUM = 0;
+
 
 static inline nsecs_t now() {
     return systemTime(SYSTEM_TIME_MONOTONIC);
@@ -710,7 +713,7 @@
         entry->policyFlags = policyFlags;
         entry->repeatCount += 1;
     } else {
-        KeyEntry* newEntry = new KeyEntry(currentTime,
+        KeyEntry* newEntry = new KeyEntry(SYNTHESIZED_EVENT_SEQUENCE_NUM, currentTime,
                 entry->deviceId, entry->source, entry->displayId, policyFlags,
                 entry->action, entry->flags, entry->keyCode, entry->scanCode,
                 entry->metaState, entry->repeatCount + 1, entry->downTime);
@@ -2474,6 +2477,7 @@
     }
 
     MotionEntry* splitMotionEntry = new MotionEntry(
+            originalMotionEntry->sequenceNum,
             originalMotionEntry->eventTime,
             originalMotionEntry->deviceId,
             originalMotionEntry->source,
@@ -2507,7 +2511,8 @@
     { // acquire lock
         AutoMutex _l(mLock);
 
-        ConfigurationChangedEntry* newEntry = new ConfigurationChangedEntry(args->eventTime);
+        ConfigurationChangedEntry* newEntry =
+                new ConfigurationChangedEntry(args->sequenceNum, args->eventTime);
         needWake = enqueueInboundEventLocked(newEntry);
     } // release lock
 
@@ -2612,7 +2617,7 @@
             mLock.lock();
         }
 
-        KeyEntry* newEntry = new KeyEntry(args->eventTime,
+        KeyEntry* newEntry = new KeyEntry(args->sequenceNum, args->eventTime,
                 args->deviceId, args->source, args->displayId, policyFlags,
                 args->action, flags, keyCode, args->scanCode,
                 metaState, repeatCount, args->downTime);
@@ -2696,7 +2701,7 @@
         }
 
         // Just enqueue a new motion event.
-        MotionEntry* newEntry = new MotionEntry(args->eventTime,
+        MotionEntry* newEntry = new MotionEntry(args->sequenceNum, args->eventTime,
                 args->deviceId, args->source, args->displayId, policyFlags,
                 args->action, args->actionButton, args->flags,
                 args->metaState, args->buttonState,
@@ -2740,7 +2745,8 @@
     { // acquire lock
         AutoMutex _l(mLock);
 
-        DeviceResetEntry* newEntry = new DeviceResetEntry(args->eventTime, args->deviceId);
+        DeviceResetEntry* newEntry =
+                new DeviceResetEntry(args->sequenceNum, args->eventTime, args->deviceId);
         needWake = enqueueInboundEventLocked(newEntry);
     } // release lock
 
@@ -2799,7 +2805,7 @@
         }
 
         mLock.lock();
-        firstInjectedEntry = new KeyEntry(keyEvent.getEventTime(),
+        firstInjectedEntry = new KeyEntry(SYNTHESIZED_EVENT_SEQUENCE_NUM, keyEvent.getEventTime(),
                 keyEvent.getDeviceId(), keyEvent.getSource(), keyEvent.getDisplayId(),
                 policyFlags, action, flags,
                 keyEvent.getKeyCode(), keyEvent.getScanCode(), keyEvent.getMetaState(),
@@ -2831,7 +2837,7 @@
         mLock.lock();
         const nsecs_t* sampleEventTimes = motionEvent->getSampleEventTimes();
         const PointerCoords* samplePointerCoords = motionEvent->getSamplePointerCoords();
-        firstInjectedEntry = new MotionEntry(*sampleEventTimes,
+        firstInjectedEntry = new MotionEntry(SYNTHESIZED_EVENT_SEQUENCE_NUM, *sampleEventTimes,
                 motionEvent->getDeviceId(), motionEvent->getSource(), motionEvent->getDisplayId(),
                 policyFlags,
                 action, actionButton, motionEvent->getFlags(),
@@ -2845,7 +2851,8 @@
         for (size_t i = motionEvent->getHistorySize(); i > 0; i--) {
             sampleEventTimes += 1;
             samplePointerCoords += pointerCount;
-            MotionEntry* nextInjectedEntry = new MotionEntry(*sampleEventTimes,
+            MotionEntry* nextInjectedEntry = new MotionEntry(SYNTHESIZED_EVENT_SEQUENCE_NUM,
+                    *sampleEventTimes,
                     motionEvent->getDeviceId(), motionEvent->getSource(),
                     motionEvent->getDisplayId(), policyFlags,
                     action, actionButton, motionEvent->getFlags(),
@@ -4279,9 +4286,10 @@
 
 // --- InputDispatcher::EventEntry ---
 
-InputDispatcher::EventEntry::EventEntry(int32_t type, nsecs_t eventTime, uint32_t policyFlags) :
-        refCount(1), type(type), eventTime(eventTime), policyFlags(policyFlags),
-        injectionState(nullptr), dispatchInProgress(false) {
+InputDispatcher::EventEntry::EventEntry(uint32_t sequenceNum, int32_t type,
+        nsecs_t eventTime, uint32_t policyFlags) :
+        sequenceNum(sequenceNum), refCount(1), type(type), eventTime(eventTime),
+        policyFlags(policyFlags), injectionState(nullptr), dispatchInProgress(false) {
 }
 
 InputDispatcher::EventEntry::~EventEntry() {
@@ -4307,8 +4315,9 @@
 
 // --- InputDispatcher::ConfigurationChangedEntry ---
 
-InputDispatcher::ConfigurationChangedEntry::ConfigurationChangedEntry(nsecs_t eventTime) :
-        EventEntry(TYPE_CONFIGURATION_CHANGED, eventTime, 0) {
+InputDispatcher::ConfigurationChangedEntry::ConfigurationChangedEntry(
+        uint32_t sequenceNum, nsecs_t eventTime) :
+        EventEntry(sequenceNum, TYPE_CONFIGURATION_CHANGED, eventTime, 0) {
 }
 
 InputDispatcher::ConfigurationChangedEntry::~ConfigurationChangedEntry() {
@@ -4321,8 +4330,9 @@
 
 // --- InputDispatcher::DeviceResetEntry ---
 
-InputDispatcher::DeviceResetEntry::DeviceResetEntry(nsecs_t eventTime, int32_t deviceId) :
-        EventEntry(TYPE_DEVICE_RESET, eventTime, 0),
+InputDispatcher::DeviceResetEntry::DeviceResetEntry(
+        uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId) :
+        EventEntry(sequenceNum, TYPE_DEVICE_RESET, eventTime, 0),
         deviceId(deviceId) {
 }
 
@@ -4337,11 +4347,11 @@
 
 // --- InputDispatcher::KeyEntry ---
 
-InputDispatcher::KeyEntry::KeyEntry(nsecs_t eventTime,
+InputDispatcher::KeyEntry::KeyEntry(uint32_t sequenceNum, nsecs_t eventTime,
         int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags, int32_t action,
         int32_t flags, int32_t keyCode, int32_t scanCode, int32_t metaState,
         int32_t repeatCount, nsecs_t downTime) :
-        EventEntry(TYPE_KEY, eventTime, policyFlags),
+        EventEntry(sequenceNum, TYPE_KEY, eventTime, policyFlags),
         deviceId(deviceId), source(source), displayId(displayId), action(action), flags(flags),
         keyCode(keyCode), scanCode(scanCode), metaState(metaState),
         repeatCount(repeatCount), downTime(downTime),
@@ -4372,7 +4382,7 @@
 
 // --- InputDispatcher::MotionEntry ---
 
-InputDispatcher::MotionEntry::MotionEntry(nsecs_t eventTime, int32_t deviceId,
+InputDispatcher::MotionEntry::MotionEntry(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId,
         uint32_t source, int32_t displayId, uint32_t policyFlags, int32_t action,
         int32_t actionButton,
         int32_t flags, int32_t metaState, int32_t buttonState, int32_t edgeFlags,
@@ -4380,7 +4390,7 @@
         uint32_t pointerCount,
         const PointerProperties* pointerProperties, const PointerCoords* pointerCoords,
         float xOffset, float yOffset) :
-        EventEntry(TYPE_MOTION, eventTime, policyFlags),
+        EventEntry(sequenceNum, TYPE_MOTION, eventTime, policyFlags),
         eventTime(eventTime),
         deviceId(deviceId), source(source), displayId(displayId), action(action),
         actionButton(actionButton), flags(flags), metaState(metaState), buttonState(buttonState),
@@ -4694,7 +4704,7 @@
     for (size_t i = 0; i < mKeyMementos.size(); i++) {
         const KeyMemento& memento = mKeyMementos.itemAt(i);
         if (shouldCancelKey(memento, options)) {
-            outEvents.push(new KeyEntry(currentTime,
+            outEvents.push(new KeyEntry(SYNTHESIZED_EVENT_SEQUENCE_NUM, currentTime,
                     memento.deviceId, memento.source, memento.displayId, memento.policyFlags,
                     AKEY_EVENT_ACTION_UP, memento.flags | AKEY_EVENT_FLAG_CANCELED,
                     memento.keyCode, memento.scanCode, memento.metaState, 0, memento.downTime));
@@ -4704,7 +4714,7 @@
     for (size_t i = 0; i < mMotionMementos.size(); i++) {
         const MotionMemento& memento = mMotionMementos.itemAt(i);
         if (shouldCancelMotion(memento, options)) {
-            outEvents.push(new MotionEntry(currentTime,
+            outEvents.push(new MotionEntry(SYNTHESIZED_EVENT_SEQUENCE_NUM, currentTime,
                     memento.deviceId, memento.source, memento.displayId, memento.policyFlags,
                     memento.hovering
                             ? AMOTION_EVENT_ACTION_HOVER_EXIT
diff --git a/services/inputflinger/InputDispatcher.h b/services/inputflinger/InputDispatcher.h
index 73bcc25..05b5dad 100644
--- a/services/inputflinger/InputDispatcher.h
+++ b/services/inputflinger/InputDispatcher.h
@@ -454,6 +454,7 @@
             TYPE_MOTION
         };
 
+        uint32_t sequenceNum;
         mutable int32_t refCount;
         int32_t type;
         nsecs_t eventTime;
@@ -469,13 +470,13 @@
         virtual void appendDescription(std::string& msg) const = 0;
 
     protected:
-        EventEntry(int32_t type, nsecs_t eventTime, uint32_t policyFlags);
+        EventEntry(uint32_t sequenceNum, int32_t type, nsecs_t eventTime, uint32_t policyFlags);
         virtual ~EventEntry();
         void releaseInjectionState();
     };
 
     struct ConfigurationChangedEntry : EventEntry {
-        explicit ConfigurationChangedEntry(nsecs_t eventTime);
+        explicit ConfigurationChangedEntry(uint32_t sequenceNum, nsecs_t eventTime);
         virtual void appendDescription(std::string& msg) const;
 
     protected:
@@ -485,7 +486,7 @@
     struct DeviceResetEntry : EventEntry {
         int32_t deviceId;
 
-        DeviceResetEntry(nsecs_t eventTime, int32_t deviceId);
+        DeviceResetEntry(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId);
         virtual void appendDescription(std::string& msg) const;
 
     protected:
@@ -515,7 +516,7 @@
         InterceptKeyResult interceptKeyResult; // set based on the interception result
         nsecs_t interceptKeyWakeupTime; // used with INTERCEPT_KEY_RESULT_TRY_AGAIN_LATER
 
-        KeyEntry(nsecs_t eventTime,
+        KeyEntry(uint32_t sequenceNum, nsecs_t eventTime,
                 int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
                 int32_t action, int32_t flags, int32_t keyCode, int32_t scanCode, int32_t metaState,
                 int32_t repeatCount, nsecs_t downTime);
@@ -544,7 +545,7 @@
         PointerProperties pointerProperties[MAX_POINTERS];
         PointerCoords pointerCoords[MAX_POINTERS];
 
-        MotionEntry(nsecs_t eventTime,
+        MotionEntry(uint32_t sequenceNum, nsecs_t eventTime,
                 int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
                 int32_t action, int32_t actionButton, int32_t flags,
                 int32_t metaState, int32_t buttonState, int32_t edgeFlags,
diff --git a/services/inputflinger/InputListener.cpp b/services/inputflinger/InputListener.cpp
index 25a39a8..23cceb4 100644
--- a/services/inputflinger/InputListener.cpp
+++ b/services/inputflinger/InputListener.cpp
@@ -26,13 +26,14 @@
 
 // --- NotifyConfigurationChangedArgs ---
 
-NotifyConfigurationChangedArgs::NotifyConfigurationChangedArgs(nsecs_t eventTime) :
-        eventTime(eventTime) {
+NotifyConfigurationChangedArgs::NotifyConfigurationChangedArgs(
+        uint32_t sequenceNum, nsecs_t eventTime) :
+        NotifyArgs(sequenceNum), eventTime(eventTime) {
 }
 
 NotifyConfigurationChangedArgs::NotifyConfigurationChangedArgs(
         const NotifyConfigurationChangedArgs& other) :
-        eventTime(other.eventTime) {
+        NotifyArgs(other.sequenceNum), eventTime(other.eventTime) {
 }
 
 void NotifyConfigurationChangedArgs::notify(const sp<InputListenerInterface>& listener) const {
@@ -42,19 +43,19 @@
 
 // --- NotifyKeyArgs ---
 
-NotifyKeyArgs::NotifyKeyArgs(nsecs_t eventTime, int32_t deviceId, uint32_t source,
-        int32_t displayId, uint32_t policyFlags,
+NotifyKeyArgs::NotifyKeyArgs(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId,
+        uint32_t source, int32_t displayId, uint32_t policyFlags,
         int32_t action, int32_t flags, int32_t keyCode, int32_t scanCode,
         int32_t metaState, nsecs_t downTime) :
-        eventTime(eventTime), deviceId(deviceId), source(source), displayId(displayId),
-        policyFlags(policyFlags),
+        NotifyArgs(sequenceNum), eventTime(eventTime), deviceId(deviceId), source(source),
+        displayId(displayId), policyFlags(policyFlags),
         action(action), flags(flags), keyCode(keyCode), scanCode(scanCode),
         metaState(metaState), downTime(downTime) {
 }
 
 NotifyKeyArgs::NotifyKeyArgs(const NotifyKeyArgs& other) :
-        eventTime(other.eventTime), deviceId(other.deviceId), source(other.source),
-        displayId(other.displayId), policyFlags(other.policyFlags),
+        NotifyArgs(other.sequenceNum), eventTime(other.eventTime), deviceId(other.deviceId),
+        source(other.source), displayId(other.displayId), policyFlags(other.policyFlags),
         action(other.action), flags(other.flags),
         keyCode(other.keyCode), scanCode(other.scanCode),
         metaState(other.metaState), downTime(other.downTime) {
@@ -67,15 +68,15 @@
 
 // --- NotifyMotionArgs ---
 
-NotifyMotionArgs::NotifyMotionArgs(nsecs_t eventTime, int32_t deviceId, uint32_t source,
-        int32_t displayId, uint32_t policyFlags,
+NotifyMotionArgs::NotifyMotionArgs(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId,
+        uint32_t source, int32_t displayId, uint32_t policyFlags,
         int32_t action, int32_t actionButton, int32_t flags, int32_t metaState,
         int32_t buttonState, int32_t edgeFlags, uint32_t deviceTimestamp,
         uint32_t pointerCount,
         const PointerProperties* pointerProperties, const PointerCoords* pointerCoords,
         float xPrecision, float yPrecision, nsecs_t downTime) :
-        eventTime(eventTime), deviceId(deviceId), source(source), displayId(displayId),
-        policyFlags(policyFlags),
+        NotifyArgs(sequenceNum), eventTime(eventTime), deviceId(deviceId), source(source),
+        displayId(displayId), policyFlags(policyFlags),
         action(action), actionButton(actionButton),
         flags(flags), metaState(metaState), buttonState(buttonState),
         edgeFlags(edgeFlags), deviceTimestamp(deviceTimestamp),
@@ -88,8 +89,8 @@
 }
 
 NotifyMotionArgs::NotifyMotionArgs(const NotifyMotionArgs& other) :
-        eventTime(other.eventTime), deviceId(other.deviceId), source(other.source),
-        displayId(other.displayId), policyFlags(other.policyFlags),
+        NotifyArgs(other.sequenceNum), eventTime(other.eventTime), deviceId(other.deviceId),
+        source(other.source), displayId(other.displayId), policyFlags(other.policyFlags),
         action(other.action), actionButton(other.actionButton), flags(other.flags),
         metaState(other.metaState), buttonState(other.buttonState),
         edgeFlags(other.edgeFlags),
@@ -108,14 +109,14 @@
 
 // --- NotifySwitchArgs ---
 
-NotifySwitchArgs::NotifySwitchArgs(nsecs_t eventTime, uint32_t policyFlags,
+NotifySwitchArgs::NotifySwitchArgs(uint32_t sequenceNum, nsecs_t eventTime, uint32_t policyFlags,
         uint32_t switchValues, uint32_t switchMask) :
-        eventTime(eventTime), policyFlags(policyFlags),
+        NotifyArgs(sequenceNum), eventTime(eventTime), policyFlags(policyFlags),
         switchValues(switchValues), switchMask(switchMask) {
 }
 
 NotifySwitchArgs::NotifySwitchArgs(const NotifySwitchArgs& other) :
-        eventTime(other.eventTime), policyFlags(other.policyFlags),
+        NotifyArgs(other.sequenceNum), eventTime(other.eventTime), policyFlags(other.policyFlags),
         switchValues(other.switchValues), switchMask(other.switchMask) {
 }
 
@@ -126,12 +127,13 @@
 
 // --- NotifyDeviceResetArgs ---
 
-NotifyDeviceResetArgs::NotifyDeviceResetArgs(nsecs_t eventTime, int32_t deviceId) :
-        eventTime(eventTime), deviceId(deviceId) {
+NotifyDeviceResetArgs::NotifyDeviceResetArgs(
+        uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId) :
+        NotifyArgs(sequenceNum), eventTime(eventTime), deviceId(deviceId) {
 }
 
 NotifyDeviceResetArgs::NotifyDeviceResetArgs(const NotifyDeviceResetArgs& other) :
-        eventTime(other.eventTime), deviceId(other.deviceId) {
+        NotifyArgs(other.sequenceNum), eventTime(other.eventTime), deviceId(other.deviceId) {
 }
 
 void NotifyDeviceResetArgs::notify(const sp<InputListenerInterface>& listener) const {
diff --git a/services/inputflinger/InputReader.cpp b/services/inputflinger/InputReader.cpp
index 9ba4140..7e00f42 100644
--- a/services/inputflinger/InputReader.cpp
+++ b/services/inputflinger/InputReader.cpp
@@ -236,8 +236,8 @@
             || (action == AKEY_EVENT_ACTION_UP
                     && (lastButtonState & buttonState)
                     && !(currentButtonState & buttonState))) {
-        NotifyKeyArgs args(when, deviceId, source, displayId, policyFlags,
-                action, 0, keyCode, 0, context->getGlobalMetaState(), when);
+        NotifyKeyArgs args(context->getNextSequenceNum(), when, deviceId, source, displayId,
+                policyFlags, action, 0, keyCode, 0, context->getGlobalMetaState(), when);
         context->getListener()->notifyKey(&args);
     }
 }
@@ -261,7 +261,7 @@
         const sp<InputReaderPolicyInterface>& policy,
         const sp<InputListenerInterface>& listener) :
         mContext(this), mEventHub(eventHub), mPolicy(policy),
-        mGlobalMetaState(0), mGeneration(1),
+        mNextSequenceNum(1), mGlobalMetaState(0), mGeneration(1),
         mDisableVirtualKeysTimeout(LLONG_MIN), mNextTimeout(LLONG_MAX),
         mConfigurationChangesToRefresh(0) {
     mQueuedListener = new QueuedInputListener(listener);
@@ -547,7 +547,7 @@
     updateGlobalMetaStateLocked();
 
     // Enqueue configuration changed.
-    NotifyConfigurationChangedArgs args(when);
+    NotifyConfigurationChangedArgs args(mContext.getNextSequenceNum(), when);
     mQueuedListener->notifyConfigurationChanged(&args);
 }
 
@@ -945,6 +945,9 @@
     return mReader->mEventHub.get();
 }
 
+uint32_t InputReader::ContextImpl::getNextSequenceNum() {
+    return (mReader->mNextSequenceNum)++;
+}
 
 // --- InputDevice ---
 
@@ -1265,7 +1268,7 @@
 }
 
 void InputDevice::notifyReset(nsecs_t when) {
-    NotifyDeviceResetArgs args(when, mId);
+    NotifyDeviceResetArgs args(mContext->getNextSequenceNum(), when, mId);
     mContext->getListener()->notifyDeviceReset(&args);
 }
 
@@ -2038,7 +2041,8 @@
 void SwitchInputMapper::sync(nsecs_t when) {
     if (mUpdatedSwitchMask) {
         uint32_t updatedSwitchValues = mSwitchValues & mUpdatedSwitchMask;
-        NotifySwitchArgs args(when, 0, updatedSwitchValues, mUpdatedSwitchMask);
+        NotifySwitchArgs args(mContext->getNextSequenceNum(), when, 0, updatedSwitchValues,
+                mUpdatedSwitchMask);
         getListener()->notifySwitch(&args);
 
         mUpdatedSwitchMask = 0;
@@ -2420,8 +2424,8 @@
         policyFlags |= POLICY_FLAG_DISABLE_KEY_REPEAT;
     }
 
-    NotifyKeyArgs args(when, getDeviceId(), mSource, getDisplayId(), policyFlags,
-            down ? AKEY_EVENT_ACTION_DOWN : AKEY_EVENT_ACTION_UP,
+    NotifyKeyArgs args(mContext->getNextSequenceNum(), when, getDeviceId(), mSource,
+            getDisplayId(), policyFlags, down ? AKEY_EVENT_ACTION_DOWN : AKEY_EVENT_ACTION_UP,
             AKEY_EVENT_FLAG_FROM_SYSTEM, keyCode, scanCode, keyMetaState, downTime);
     getListener()->notifyKey(&args);
 }
@@ -2824,7 +2828,8 @@
             while (!released.isEmpty()) {
                 int32_t actionButton = BitSet32::valueForBit(released.clearFirstMarkedBit());
                 buttonState &= ~actionButton;
-                NotifyMotionArgs releaseArgs(when, getDeviceId(), mSource, displayId, policyFlags,
+                NotifyMotionArgs releaseArgs(mContext->getNextSequenceNum(), when, getDeviceId(),
+                        mSource, displayId, policyFlags,
                         AMOTION_EVENT_ACTION_BUTTON_RELEASE, actionButton, 0,
                         metaState, buttonState, AMOTION_EVENT_EDGE_FLAG_NONE,
                         /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
@@ -2833,8 +2838,8 @@
             }
         }
 
-        NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
-                motionEventAction, 0, 0, metaState, currentButtonState,
+        NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(), mSource,
+                displayId, policyFlags, motionEventAction, 0, 0, metaState, currentButtonState,
                 AMOTION_EVENT_EDGE_FLAG_NONE,
                 /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
                 mXPrecision, mYPrecision, downTime);
@@ -2845,9 +2850,9 @@
             while (!pressed.isEmpty()) {
                 int32_t actionButton = BitSet32::valueForBit(pressed.clearFirstMarkedBit());
                 buttonState |= actionButton;
-                NotifyMotionArgs pressArgs(when, getDeviceId(), mSource, displayId, policyFlags,
-                        AMOTION_EVENT_ACTION_BUTTON_PRESS, actionButton, 0,
-                        metaState, buttonState, AMOTION_EVENT_EDGE_FLAG_NONE,
+                NotifyMotionArgs pressArgs(mContext->getNextSequenceNum(), when, getDeviceId(),
+                        mSource, displayId, policyFlags, AMOTION_EVENT_ACTION_BUTTON_PRESS,
+                        actionButton, 0, metaState, buttonState, AMOTION_EVENT_EDGE_FLAG_NONE,
                         /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
                         mXPrecision, mYPrecision, downTime);
                 getListener()->notifyMotion(&pressArgs);
@@ -2859,8 +2864,8 @@
         // Send hover move after UP to tell the application that the mouse is hovering now.
         if (motionEventAction == AMOTION_EVENT_ACTION_UP
                 && (mSource == AINPUT_SOURCE_MOUSE)) {
-            NotifyMotionArgs hoverArgs(when, getDeviceId(), mSource, displayId, policyFlags,
-                    AMOTION_EVENT_ACTION_HOVER_MOVE, 0, 0,
+            NotifyMotionArgs hoverArgs(mContext->getNextSequenceNum(), when, getDeviceId(),
+                    mSource, displayId, policyFlags, AMOTION_EVENT_ACTION_HOVER_MOVE, 0, 0,
                     metaState, currentButtonState, AMOTION_EVENT_EDGE_FLAG_NONE,
                     /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
                     mXPrecision, mYPrecision, downTime);
@@ -2872,7 +2877,8 @@
             pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_VSCROLL, vscroll);
             pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_HSCROLL, hscroll);
 
-            NotifyMotionArgs scrollArgs(when, getDeviceId(), mSource, displayId, policyFlags,
+            NotifyMotionArgs scrollArgs(mContext->getNextSequenceNum(), when, getDeviceId(),
+                    mSource, displayId, policyFlags,
                     AMOTION_EVENT_ACTION_SCROLL, 0, 0, metaState, currentButtonState,
                     AMOTION_EVENT_EDGE_FLAG_NONE,
                     /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
@@ -3003,7 +3009,8 @@
         int32_t metaState = mContext->getGlobalMetaState();
         pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_SCROLL, scroll * mScalingFactor);
 
-        NotifyMotionArgs scrollArgs(when, getDeviceId(), mSource, displayId, policyFlags,
+        NotifyMotionArgs scrollArgs(mContext->getNextSequenceNum(), when, getDeviceId(),
+                mSource, displayId, policyFlags,
                 AMOTION_EVENT_ACTION_SCROLL, 0, 0, metaState, 0,
                 AMOTION_EVENT_EDGE_FLAG_NONE,
                 /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
@@ -4698,7 +4705,8 @@
     int32_t metaState = mContext->getGlobalMetaState();
     policyFlags |= POLICY_FLAG_VIRTUAL;
 
-    NotifyKeyArgs args(when, getDeviceId(), AINPUT_SOURCE_KEYBOARD, mViewport.displayId,
+    NotifyKeyArgs args(mContext->getNextSequenceNum(), when, getDeviceId(), AINPUT_SOURCE_KEYBOARD,
+            mViewport.displayId,
             policyFlags, keyEventAction, keyEventFlags, keyCode, scanCode, metaState, downTime);
     getListener()->notifyKey(&args);
 }
@@ -5392,8 +5400,8 @@
         pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, y);
 
         int32_t displayId = mPointerController->getDisplayId();
-        NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
-                AMOTION_EVENT_ACTION_HOVER_MOVE, 0, 0,
+        NotifyMotionArgs args(mContext->getNextSequenceNum(), when, displayId, mSource,
+                mViewport.displayId, policyFlags, AMOTION_EVENT_ACTION_HOVER_MOVE, 0, 0,
                 metaState, buttonState, AMOTION_EVENT_EDGE_FLAG_NONE,
                 /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
                 0, 0, mPointerGesture.downTime);
@@ -6317,7 +6325,8 @@
         mPointerSimple.down = false;
 
         // Send up.
-        NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
+        NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+                mSource, displayId, policyFlags,
                  AMOTION_EVENT_ACTION_UP, 0, 0, metaState, mLastRawState.buttonState, 0,
                  /* deviceTimestamp */ 0,
                  1, &mPointerSimple.lastProperties, &mPointerSimple.lastCoords,
@@ -6330,7 +6339,8 @@
         mPointerSimple.hovering = false;
 
         // Send hover exit.
-        NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
+        NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+                mSource, displayId, policyFlags,
                 AMOTION_EVENT_ACTION_HOVER_EXIT, 0, 0, metaState, mLastRawState.buttonState, 0,
                 /* deviceTimestamp */ 0,
                 1, &mPointerSimple.lastProperties, &mPointerSimple.lastCoords,
@@ -6345,7 +6355,8 @@
             mPointerSimple.downTime = when;
 
             // Send down.
-            NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
+            NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+                    mSource, displayId, policyFlags,
                     AMOTION_EVENT_ACTION_DOWN, 0, 0, metaState, mCurrentRawState.buttonState, 0,
                     /* deviceTimestamp */ 0,
                     1, &mPointerSimple.currentProperties, &mPointerSimple.currentCoords,
@@ -6355,7 +6366,8 @@
         }
 
         // Send move.
-        NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
+        NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+                mSource, displayId, policyFlags,
                 AMOTION_EVENT_ACTION_MOVE, 0, 0, metaState, mCurrentRawState.buttonState, 0,
                 /* deviceTimestamp */ 0,
                 1, &mPointerSimple.currentProperties, &mPointerSimple.currentCoords,
@@ -6369,7 +6381,8 @@
             mPointerSimple.hovering = true;
 
             // Send hover enter.
-            NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
+            NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+                    mSource, displayId, policyFlags,
                     AMOTION_EVENT_ACTION_HOVER_ENTER, 0, 0, metaState,
                     mCurrentRawState.buttonState, 0,
                     /* deviceTimestamp */ 0,
@@ -6380,7 +6393,8 @@
         }
 
         // Send hover move.
-        NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
+        NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+                mSource, displayId, policyFlags,
                 AMOTION_EVENT_ACTION_HOVER_MOVE, 0, 0, metaState,
                 mCurrentRawState.buttonState, 0,
                 /* deviceTimestamp */ 0,
@@ -6402,7 +6416,8 @@
         pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_VSCROLL, vscroll);
         pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_HSCROLL, hscroll);
 
-        NotifyMotionArgs args(when, getDeviceId(), mSource, displayId, policyFlags,
+        NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+                mSource, displayId, policyFlags,
                 AMOTION_EVENT_ACTION_SCROLL, 0, 0, metaState, mCurrentRawState.buttonState, 0,
                 /* deviceTimestamp */ 0,
                 1, &mPointerSimple.currentProperties, &pointerCoords,
@@ -6466,7 +6481,8 @@
     }
     int32_t displayId = mPointerController != nullptr ?
             mPointerController->getDisplayId() : mViewport.displayId;
-    NotifyMotionArgs args(when, getDeviceId(), source, displayId, policyFlags,
+    NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+            source, displayId, policyFlags,
             action, actionButton, flags, metaState, buttonState, edgeFlags,
             deviceTimestamp, pointerCount, pointerProperties, pointerCoords,
             xPrecision, yPrecision, downTime);
@@ -7390,8 +7406,8 @@
     // TODO: Use the input device configuration to control this behavior more finely.
     uint32_t policyFlags = 0;
 
-    NotifyMotionArgs args(when, getDeviceId(), AINPUT_SOURCE_JOYSTICK, ADISPLAY_ID_NONE,
-            policyFlags,
+    NotifyMotionArgs args(mContext->getNextSequenceNum(), when, getDeviceId(),
+            AINPUT_SOURCE_JOYSTICK, ADISPLAY_ID_NONE, policyFlags,
             AMOTION_EVENT_ACTION_MOVE, 0, 0, metaState, buttonState, AMOTION_EVENT_EDGE_FLAG_NONE,
             /* deviceTimestamp */ 0, 1, &pointerProperties, &pointerCoords,
             0, 0, 0);
diff --git a/services/inputflinger/InputReader.h b/services/inputflinger/InputReader.h
index 13f1bed..35f3c23 100644
--- a/services/inputflinger/InputReader.h
+++ b/services/inputflinger/InputReader.h
@@ -96,6 +96,8 @@
     virtual InputReaderPolicyInterface* getPolicy() = 0;
     virtual InputListenerInterface* getListener() = 0;
     virtual EventHubInterface* getEventHub() = 0;
+
+    virtual uint32_t getNextSequenceNum() = 0;
 };
 
 
@@ -168,6 +170,7 @@
         virtual InputReaderPolicyInterface* getPolicy();
         virtual InputListenerInterface* getListener();
         virtual EventHubInterface* getEventHub();
+        virtual uint32_t getNextSequenceNum();
     } mContext;
 
     friend class ContextImpl;
@@ -183,6 +186,9 @@
 
     InputReaderConfiguration mConfig;
 
+    // used by InputReaderContext::getNextSequenceNum() as a counter for event sequence numbers
+    uint32_t mNextSequenceNum;
+
     // The event queue.
     static const int EVENT_BUFFER_SIZE = 256;
     RawEvent mEventBuffer[EVENT_BUFFER_SIZE];
diff --git a/services/inputflinger/include/InputListener.h b/services/inputflinger/include/InputListener.h
index a3d919b..f3a30ab 100644
--- a/services/inputflinger/include/InputListener.h
+++ b/services/inputflinger/include/InputListener.h
@@ -28,6 +28,12 @@
 
 /* Superclass of all input event argument objects */
 struct NotifyArgs {
+    uint32_t sequenceNum;
+
+    inline NotifyArgs() : sequenceNum(0) { }
+
+    inline explicit NotifyArgs(uint32_t sequenceNum) : sequenceNum(sequenceNum) { }
+
     virtual ~NotifyArgs() { }
 
     virtual void notify(const sp<InputListenerInterface>& listener) const = 0;
@@ -40,7 +46,7 @@
 
     inline NotifyConfigurationChangedArgs() { }
 
-    explicit NotifyConfigurationChangedArgs(nsecs_t eventTime);
+    NotifyConfigurationChangedArgs(uint32_t sequenceNum, nsecs_t eventTime);
 
     NotifyConfigurationChangedArgs(const NotifyConfigurationChangedArgs& other);
 
@@ -66,9 +72,9 @@
 
     inline NotifyKeyArgs() { }
 
-    NotifyKeyArgs(nsecs_t eventTime, int32_t deviceId, uint32_t source, int32_t displayId,
-            uint32_t policyFlags, int32_t action, int32_t flags, int32_t keyCode, int32_t scanCode,
-            int32_t metaState, nsecs_t downTime);
+    NotifyKeyArgs(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId, uint32_t source,
+            int32_t displayId, uint32_t policyFlags, int32_t action, int32_t flags, int32_t keyCode,
+            int32_t scanCode, int32_t metaState, nsecs_t downTime);
 
     NotifyKeyArgs(const NotifyKeyArgs& other);
 
@@ -107,8 +113,8 @@
 
     inline NotifyMotionArgs() { }
 
-    NotifyMotionArgs(nsecs_t eventTime, int32_t deviceId, uint32_t source, int32_t displayId,
-            uint32_t policyFlags,
+    NotifyMotionArgs(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId, uint32_t source,
+            int32_t displayId, uint32_t policyFlags,
             int32_t action, int32_t actionButton, int32_t flags,
             int32_t metaState, int32_t buttonState,
             int32_t edgeFlags, uint32_t deviceTimestamp, uint32_t pointerCount,
@@ -132,7 +138,7 @@
 
     inline NotifySwitchArgs() { }
 
-    NotifySwitchArgs(nsecs_t eventTime, uint32_t policyFlags,
+    NotifySwitchArgs(uint32_t sequenceNum, nsecs_t eventTime, uint32_t policyFlags,
             uint32_t switchValues, uint32_t switchMask);
 
     NotifySwitchArgs(const NotifySwitchArgs& other);
@@ -151,7 +157,7 @@
 
     inline NotifyDeviceResetArgs() { }
 
-    NotifyDeviceResetArgs(nsecs_t eventTime, int32_t deviceId);
+    NotifyDeviceResetArgs(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId);
 
     NotifyDeviceResetArgs(const NotifyDeviceResetArgs& other);
 
diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index b18cae3..855247f 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -853,13 +853,14 @@
     int32_t mGlobalMetaState;
     bool mUpdateGlobalMetaStateWasCalled;
     int32_t mGeneration;
+    uint32_t mNextSequenceNum;
 
 public:
     FakeInputReaderContext(const sp<EventHubInterface>& eventHub,
             const sp<InputReaderPolicyInterface>& policy,
             const sp<InputListenerInterface>& listener) :
             mEventHub(eventHub), mPolicy(policy), mListener(listener),
-            mGlobalMetaState(0) {
+            mGlobalMetaState(0), mNextSequenceNum(1) {
     }
 
     virtual ~FakeInputReaderContext() { }
@@ -923,6 +924,10 @@
     virtual void dispatchExternalStylusState(const StylusState&) {
 
     }
+
+    virtual uint32_t getNextSequenceNum() {
+        return mNextSequenceNum++;
+    }
 };
 
 
@@ -1568,6 +1573,39 @@
     ASSERT_EQ(1, event.value);
 }
 
+TEST_F(InputReaderTest, DeviceReset_IncrementsSequenceNumber) {
+    constexpr int32_t deviceId = 1;
+    constexpr uint32_t deviceClass = INPUT_DEVICE_CLASS_KEYBOARD;
+    InputDevice* device = mReader->newDevice(deviceId, 0, "fake", deviceClass);
+    // Must add at least one mapper or the device will be ignored!
+    FakeInputMapper* mapper = new FakeInputMapper(device, AINPUT_SOURCE_KEYBOARD);
+    device->addMapper(mapper);
+    mReader->setNextDevice(device);
+    addDevice(deviceId, "fake", deviceClass, nullptr);
+
+    NotifyDeviceResetArgs resetArgs;
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyDeviceResetWasCalled(&resetArgs));
+    uint32_t prevSequenceNum = resetArgs.sequenceNum;
+
+    disableDevice(deviceId, device);
+    mReader->loopOnce();
+    mFakeListener->assertNotifyDeviceResetWasCalled(&resetArgs);
+    ASSERT_TRUE(prevSequenceNum < resetArgs.sequenceNum);
+    prevSequenceNum = resetArgs.sequenceNum;
+
+    enableDevice(deviceId, device);
+    mReader->loopOnce();
+    mFakeListener->assertNotifyDeviceResetWasCalled(&resetArgs);
+    ASSERT_TRUE(prevSequenceNum < resetArgs.sequenceNum);
+    prevSequenceNum = resetArgs.sequenceNum;
+
+    disableDevice(deviceId, device);
+    mReader->loopOnce();
+    mFakeListener->assertNotifyDeviceResetWasCalled(&resetArgs);
+    ASSERT_TRUE(prevSequenceNum < resetArgs.sequenceNum);
+    prevSequenceNum = resetArgs.sequenceNum;
+}
+
 
 // --- InputDeviceTest ---