diff --git a/libs/input/Input.cpp b/libs/input/Input.cpp
index a624663..db27e11 100644
--- a/libs/input/Input.cpp
+++ b/libs/input/Input.cpp
@@ -215,6 +215,7 @@
 void MotionEvent::initialize(
         int32_t deviceId,
         int32_t source,
+        int32_t displayId,
         int32_t action,
         int32_t actionButton,
         int32_t flags,
@@ -231,6 +232,7 @@
         const PointerProperties* pointerProperties,
         const PointerCoords* pointerCoords) {
     InputEvent::initialize(deviceId, source);
+    mDisplayId = displayId;
     mAction = action;
     mActionButton = actionButton;
     mFlags = flags;
@@ -251,6 +253,7 @@
 
 void MotionEvent::copyFrom(const MotionEvent* other, bool keepHistory) {
     InputEvent::initialize(other->mDeviceId, other->mSource);
+    mDisplayId = other->mDisplayId;
     mAction = other->mAction;
     mActionButton = other->mActionButton;
     mFlags = other->mFlags;
@@ -431,6 +434,7 @@
 
     mDeviceId = parcel->readInt32();
     mSource = parcel->readInt32();
+    mDisplayId = parcel->readInt32();
     mAction = parcel->readInt32();
     mActionButton = parcel->readInt32();
     mFlags = parcel->readInt32();
@@ -480,6 +484,7 @@
 
     parcel->writeInt32(mDeviceId);
     parcel->writeInt32(mSource);
+    parcel->writeInt32(mDisplayId);
     parcel->writeInt32(mAction);
     parcel->writeInt32(mActionButton);
     parcel->writeInt32(mFlags);
diff --git a/libs/input/InputTransport.cpp b/libs/input/InputTransport.cpp
index aa0bf17..f1c3fea 100644
--- a/libs/input/InputTransport.cpp
+++ b/libs/input/InputTransport.cpp
@@ -303,13 +303,15 @@
         const PointerCoords* pointerCoords) {
 #if DEBUG_TRANSPORT_ACTIONS
     ALOGD("channel '%s' publisher ~ publishMotionEvent: seq=%u, deviceId=%d, source=0x%x, "
+            "displayId=%" PRId32 ", "
             "action=0x%x, actionButton=0x%08x, flags=0x%x, edgeFlags=0x%x, "
             "metaState=0x%x, buttonState=0x%x, xOffset=%f, yOffset=%f, "
             "xPrecision=%f, yPrecision=%f, downTime=%" PRId64 ", eventTime=%" PRId64 ", "
             "pointerCount=%" PRIu32,
             mChannel->getName().c_str(), seq,
-            deviceId, source, action, actionButton, flags, edgeFlags, metaState, buttonState,
-            xOffset, yOffset, xPrecision, yPrecision, downTime, eventTime, pointerCount);
+            deviceId, source, displayId, action, actionButton, flags, edgeFlags, metaState,
+            buttonState, xOffset, yOffset, xPrecision, yPrecision, downTime, eventTime,
+            pointerCount);
 #endif
 
     if (!seq) {
@@ -398,8 +400,7 @@
 }
 
 status_t InputConsumer::consume(InputEventFactoryInterface* factory,
-        bool consumeBatches, nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent,
-        int32_t* displayId) {
+        bool consumeBatches, nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) {
 #if DEBUG_TRANSPORT_ACTIONS
     ALOGD("channel '%s' consumer ~ consume: consumeBatches=%s, frameTime=%" PRId64,
             mChannel->getName().c_str(), consumeBatches ? "true" : "false", frameTime);
@@ -407,7 +408,6 @@
 
     *outSeq = 0;
     *outEvent = NULL;
-    *displayId = -1;  // Invalid display.
 
     // Fetch the next input message.
     // Loop until an event can be returned or no additional events are received.
@@ -422,7 +422,7 @@
             if (result) {
                 // Consume the next batched event unless batches are being held for later.
                 if (consumeBatches || result != WOULD_BLOCK) {
-                    result = consumeBatch(factory, frameTime, outSeq, outEvent, displayId);
+                    result = consumeBatch(factory, frameTime, outSeq, outEvent);
                     if (*outEvent) {
 #if DEBUG_TRANSPORT_ACTIONS
                         ALOGD("channel '%s' consumer ~ consumed batch event, seq=%u",
@@ -466,7 +466,7 @@
                     // the previous batch right now and defer the new message until later.
                     mMsgDeferred = true;
                     status_t result = consumeSamples(factory,
-                            batch, batch.samples.size(), outSeq, outEvent, displayId);
+                            batch, batch.samples.size(), outSeq, outEvent);
                     mBatches.removeAt(batchIndex);
                     if (result) {
                         return result;
@@ -500,7 +500,7 @@
             initializeMotionEvent(motionEvent, &mMsg);
             *outSeq = mMsg.body.motion.seq;
             *outEvent = motionEvent;
-            *displayId = mMsg.body.motion.displayId;
+
 #if DEBUG_TRANSPORT_ACTIONS
             ALOGD("channel '%s' consumer ~ consumed motion event, seq=%u",
                     mChannel->getName().c_str(), *outSeq);
@@ -518,14 +518,13 @@
 }
 
 status_t InputConsumer::consumeBatch(InputEventFactoryInterface* factory,
-        nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent, int32_t* displayId) {
+        nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) {
     status_t result;
     for (size_t i = mBatches.size(); i > 0; ) {
         i--;
         Batch& batch = mBatches.editItemAt(i);
         if (frameTime < 0) {
-            result = consumeSamples(factory, batch, batch.samples.size(),
-                    outSeq, outEvent, displayId);
+            result = consumeSamples(factory, batch, batch.samples.size(), outSeq, outEvent);
             mBatches.removeAt(i);
             return result;
         }
@@ -539,7 +538,7 @@
             continue;
         }
 
-        result = consumeSamples(factory, batch, split + 1, outSeq, outEvent, displayId);
+        result = consumeSamples(factory, batch, split + 1, outSeq, outEvent);
         const InputMessage* next;
         if (batch.samples.isEmpty()) {
             mBatches.removeAt(i);
@@ -557,7 +556,7 @@
 }
 
 status_t InputConsumer::consumeSamples(InputEventFactoryInterface* factory,
-        Batch& batch, size_t count, uint32_t* outSeq, InputEvent** outEvent, int32_t* displayId) {
+        Batch& batch, size_t count, uint32_t* outSeq, InputEvent** outEvent) {
     MotionEvent* motionEvent = factory->createMotionEvent();
     if (! motionEvent) return NO_MEMORY;
 
@@ -572,7 +571,6 @@
             mSeqChains.push(seqChain);
             addSample(motionEvent, &msg);
         } else {
-            *displayId = msg.body.motion.displayId;
             initializeMotionEvent(motionEvent, &msg);
         }
         chain = msg.body.motion.seq;
@@ -950,6 +948,7 @@
     event->initialize(
             msg->body.motion.deviceId,
             msg->body.motion.source,
+            msg->body.motion.displayId,
             msg->body.motion.action,
             msg->body.motion.actionButton,
             msg->body.motion.flags,
diff --git a/libs/input/tests/InputEvent_test.cpp b/libs/input/tests/InputEvent_test.cpp
index fd3b7c8..c4b8fe3 100644
--- a/libs/input/tests/InputEvent_test.cpp
+++ b/libs/input/tests/InputEvent_test.cpp
@@ -22,6 +22,9 @@
 
 namespace android {
 
+// Default display id.
+static constexpr int32_t DISPLAY_ID = ADISPLAY_ID_DEFAULT;
+
 class BaseTest : public testing::Test {
 protected:
     virtual void SetUp() { }
@@ -248,7 +251,7 @@
     pointerCoords[1].setAxisValue(AMOTION_EVENT_AXIS_TOOL_MAJOR, 26);
     pointerCoords[1].setAxisValue(AMOTION_EVENT_AXIS_TOOL_MINOR, 27);
     pointerCoords[1].setAxisValue(AMOTION_EVENT_AXIS_ORIENTATION, 28);
-    event->initialize(2, AINPUT_SOURCE_TOUCHSCREEN, AMOTION_EVENT_ACTION_MOVE, 0,
+    event->initialize(2, AINPUT_SOURCE_TOUCHSCREEN, DISPLAY_ID, AMOTION_EVENT_ACTION_MOVE, 0,
             AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED,
             AMOTION_EVENT_EDGE_FLAG_TOP, AMETA_ALT_ON, AMOTION_EVENT_BUTTON_PRIMARY,
             X_OFFSET, Y_OFFSET, 2.0f, 2.1f,
@@ -301,6 +304,7 @@
     ASSERT_EQ(AINPUT_EVENT_TYPE_MOTION, event->getType());
     ASSERT_EQ(2, event->getDeviceId());
     ASSERT_EQ(static_cast<int>(AINPUT_SOURCE_TOUCHSCREEN), event->getSource());
+    ASSERT_EQ(DISPLAY_ID, event->getDisplayId());
     ASSERT_EQ(AMOTION_EVENT_ACTION_MOVE, event->getAction());
     ASSERT_EQ(AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED, event->getFlags());
     ASSERT_EQ(AMOTION_EVENT_EDGE_FLAG_TOP, event->getEdgeFlags());
@@ -434,6 +438,11 @@
     event.setSource(AINPUT_SOURCE_JOYSTICK);
     ASSERT_EQ(static_cast<int>(AINPUT_SOURCE_JOYSTICK), event.getSource());
 
+    // Set displayId.
+    constexpr int32_t newDisplayId = 2;
+    event.setDisplayId(newDisplayId);
+    ASSERT_EQ(newDisplayId, event.getDisplayId());
+
     // Set action.
     event.setAction(AMOTION_EVENT_ACTION_CANCEL);
     ASSERT_EQ(AMOTION_EVENT_ACTION_CANCEL, event.getAction());
@@ -557,7 +566,7 @@
         pointerCoords[i].setAxisValue(AMOTION_EVENT_AXIS_ORIENTATION, angle);
     }
     MotionEvent event;
-    event.initialize(0, 0, AMOTION_EVENT_ACTION_MOVE, 0, 0, 0, 0, 0,
+    event.initialize(0, 0, DISPLAY_ID, AMOTION_EVENT_ACTION_MOVE, 0, 0, 0, 0, 0,
             0, 0, 0, 0, 0, 0, pointerCount, pointerProperties, pointerCoords);
     float originalRawX = 0 + 3;
     float originalRawY = -RADIUS + 2;
diff --git a/libs/input/tests/InputPublisherAndConsumer_test.cpp b/libs/input/tests/InputPublisherAndConsumer_test.cpp
index c532241..6c4faed 100644
--- a/libs/input/tests/InputPublisherAndConsumer_test.cpp
+++ b/libs/input/tests/InputPublisherAndConsumer_test.cpp
@@ -89,9 +89,7 @@
 
     uint32_t consumeSeq;
     InputEvent* event;
-    int32_t displayId;
-    status = mConsumer->consume(&mEventFactory, true /*consumeBatches*/, -1, &consumeSeq, &event,
-            &displayId);
+    status = mConsumer->consume(&mEventFactory, true /*consumeBatches*/, -1, &consumeSeq, &event);
     ASSERT_EQ(OK, status)
             << "consumer consume should return OK";
 
@@ -131,23 +129,23 @@
 void InputPublisherAndConsumerTest::PublishAndConsumeMotionEvent() {
     status_t status;
 
-    const uint32_t seq = 15;
-    const int32_t deviceId = 1;
-    const int32_t source = AINPUT_SOURCE_TOUCHSCREEN;
-    int32_t displayId = 0;
-    const int32_t action = AMOTION_EVENT_ACTION_MOVE;
-    const int32_t actionButton = 0;
-    const int32_t flags = AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED;
-    const int32_t edgeFlags = AMOTION_EVENT_EDGE_FLAG_TOP;
-    const int32_t metaState = AMETA_ALT_LEFT_ON | AMETA_ALT_ON;
-    const int32_t buttonState = AMOTION_EVENT_BUTTON_PRIMARY;
-    const float xOffset = -10;
-    const float yOffset = -20;
-    const float xPrecision = 0.25;
-    const float yPrecision = 0.5;
-    const nsecs_t downTime = 3;
-    const size_t pointerCount = 3;
-    const nsecs_t eventTime = 4;
+    constexpr uint32_t seq = 15;
+    constexpr int32_t deviceId = 1;
+    constexpr int32_t source = AINPUT_SOURCE_TOUCHSCREEN;
+    constexpr int32_t displayId = 0;
+    constexpr int32_t action = AMOTION_EVENT_ACTION_MOVE;
+    constexpr int32_t actionButton = 0;
+    constexpr int32_t flags = AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED;
+    constexpr int32_t edgeFlags = AMOTION_EVENT_EDGE_FLAG_TOP;
+    constexpr int32_t metaState = AMETA_ALT_LEFT_ON | AMETA_ALT_ON;
+    constexpr int32_t buttonState = AMOTION_EVENT_BUTTON_PRIMARY;
+    constexpr float xOffset = -10;
+    constexpr float yOffset = -20;
+    constexpr float xPrecision = 0.25;
+    constexpr float yPrecision = 0.5;
+    constexpr nsecs_t downTime = 3;
+    constexpr size_t pointerCount = 3;
+    constexpr nsecs_t eventTime = 4;
     PointerProperties pointerProperties[pointerCount];
     PointerCoords pointerCoords[pointerCount];
     for (size_t i = 0; i < pointerCount; i++) {
@@ -176,8 +174,7 @@
 
     uint32_t consumeSeq;
     InputEvent* event;
-    status = mConsumer->consume(&mEventFactory, true /*consumeBatches*/, -1, &consumeSeq, &event,
-            &displayId);
+    status = mConsumer->consume(&mEventFactory, true /*consumeBatches*/, -1, &consumeSeq, &event);
     ASSERT_EQ(OK, status)
             << "consumer consume should return OK";
 
@@ -190,6 +187,7 @@
     EXPECT_EQ(seq, consumeSeq);
     EXPECT_EQ(deviceId, motionEvent->getDeviceId());
     EXPECT_EQ(source, motionEvent->getSource());
+    EXPECT_EQ(displayId, motionEvent->getDisplayId());
     EXPECT_EQ(action, motionEvent->getAction());
     EXPECT_EQ(flags, motionEvent->getFlags());
     EXPECT_EQ(edgeFlags, motionEvent->getEdgeFlags());
diff --git a/libs/input/tests/StructLayout_test.cpp b/libs/input/tests/StructLayout_test.cpp
index d19f3b8..77cce7a 100644
--- a/libs/input/tests/StructLayout_test.cpp
+++ b/libs/input/tests/StructLayout_test.cpp
@@ -38,14 +38,13 @@
   CHECK_OFFSET(InputMessage::Body::Key, eventTime, 8);
   CHECK_OFFSET(InputMessage::Body::Key, deviceId, 16);
   CHECK_OFFSET(InputMessage::Body::Key, source, 20);
-  CHECK_OFFSET(InputMessage::Body::Key, displayId, 24);
-  CHECK_OFFSET(InputMessage::Body::Key, action, 28);
-  CHECK_OFFSET(InputMessage::Body::Key, flags, 32);
-  CHECK_OFFSET(InputMessage::Body::Key, keyCode, 36);
-  CHECK_OFFSET(InputMessage::Body::Key, scanCode, 40);
-  CHECK_OFFSET(InputMessage::Body::Key, metaState, 44);
-  CHECK_OFFSET(InputMessage::Body::Key, repeatCount, 48);
-  CHECK_OFFSET(InputMessage::Body::Key, downTime, 56);
+  CHECK_OFFSET(InputMessage::Body::Key, action, 24);
+  CHECK_OFFSET(InputMessage::Body::Key, flags, 28);
+  CHECK_OFFSET(InputMessage::Body::Key, keyCode, 32);
+  CHECK_OFFSET(InputMessage::Body::Key, scanCode, 36);
+  CHECK_OFFSET(InputMessage::Body::Key, metaState, 40);
+  CHECK_OFFSET(InputMessage::Body::Key, repeatCount, 44);
+  CHECK_OFFSET(InputMessage::Body::Key, downTime, 48);
 
   CHECK_OFFSET(InputMessage::Body::Motion, seq, 0);
   CHECK_OFFSET(InputMessage::Body::Motion, eventTime, 8);
diff --git a/libs/input/tests/VelocityTracker_test.cpp b/libs/input/tests/VelocityTracker_test.cpp
index 43b6012..5242a18 100644
--- a/libs/input/tests/VelocityTracker_test.cpp
+++ b/libs/input/tests/VelocityTracker_test.cpp
@@ -26,6 +26,8 @@
 
 namespace android {
 
+constexpr int32_t DISPLAY_ID = ADISPLAY_ID_DEFAULT; // default display id
+
 constexpr int32_t DEFAULT_POINTER_ID = 0; // pointer ID used for manually defined tests
 
 // velocity must be in the range (1-tol)*EV <= velocity <= (1+tol)*EV
@@ -89,7 +91,7 @@
     // First sample added separately with initialize
     coords.setAxisValue(AMOTION_EVENT_AXIS_X, positions[0].x);
     coords.setAxisValue(AMOTION_EVENT_AXIS_Y, positions[0].y);
-    event->initialize(0, AINPUT_SOURCE_TOUCHSCREEN, AMOTION_EVENT_ACTION_MOVE,
+    event->initialize(0, AINPUT_SOURCE_TOUCHSCREEN, DISPLAY_ID, AMOTION_EVENT_ACTION_MOVE,
             0, 0, 0, 0, 0, 0, 0, 0, 0, 0, positions[0].time, 1, properties, &coords);
 
     for (size_t i = 1; i < numSamples; i++) {