diff --git a/include/input/InputDevice.h b/include/input/InputDevice.h
index 1a40fdb..ffb2cb1 100644
--- a/include/input/InputDevice.h
+++ b/include/input/InputDevice.h
@@ -68,6 +68,9 @@
      * while conforming to the filename limitations.
      */
     std::string getCanonicalName() const;
+
+    bool operator==(const InputDeviceIdentifier&) const = default;
+    bool operator!=(const InputDeviceIdentifier&) const = default;
 };
 
 /* Types of input device sensors. Keep sync with core/java/android/hardware/Sensor.java */
diff --git a/include/input/PrintTools.h b/include/input/PrintTools.h
index 02bc201..0ca6fa3 100644
--- a/include/input/PrintTools.h
+++ b/include/input/PrintTools.h
@@ -88,6 +88,20 @@
 }
 
 /**
+ * Convert map keys to string. The keys of the map should be integral type.
+ */
+template <typename K, typename V>
+std::string dumpMapKeys(const std::map<K, V>& map,
+                        std::string (*keyToString)(const K&) = constToString) {
+    std::string out;
+    for (const auto& [k, _] : map) {
+        out += out.empty() ? "{" : ", ";
+        out += keyToString(k);
+    }
+    return out.empty() ? "{}" : (out + "}");
+}
+
+/**
  * Convert a vector to a string. The values of the vector should be of a type supported by
  * constToString.
  */
diff --git a/services/inputflinger/InputDeviceMetricsCollector.cpp b/services/inputflinger/InputDeviceMetricsCollector.cpp
index c6089c8..50f336b 100644
--- a/services/inputflinger/InputDeviceMetricsCollector.cpp
+++ b/services/inputflinger/InputDeviceMetricsCollector.cpp
@@ -17,52 +17,202 @@
 #define LOG_TAG "InputDeviceMetricsCollector"
 #include "InputDeviceMetricsCollector.h"
 
+#include <android-base/stringprintf.h>
+#include <input/PrintTools.h>
+#include <linux/input.h>
+#include <statslog.h>
+
 namespace android {
 
+using android::base::StringPrintf;
+using std::chrono::nanoseconds;
+
+namespace {
+
+constexpr nanoseconds DEFAULT_USAGE_SESSION_TIMEOUT = std::chrono::seconds(5);
+
+/**
+ * Log debug messages about metrics events logged to statsd.
+ * Enable this via "adb shell setprop log.tag.InputDeviceMetricsCollector DEBUG" (requires restart)
+ */
+const bool DEBUG = __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO);
+
+int32_t linuxBusToInputDeviceBusEnum(int32_t linuxBus) {
+    switch (linuxBus) {
+        case BUS_USB:
+            return util::INPUT_DEVICE_USAGE_REPORTED__DEVICE_BUS__USB;
+        case BUS_BLUETOOTH:
+            return util::INPUT_DEVICE_USAGE_REPORTED__DEVICE_BUS__BLUETOOTH;
+        default:
+            return util::INPUT_DEVICE_USAGE_REPORTED__DEVICE_BUS__OTHER;
+    }
+}
+
+class : public InputDeviceMetricsLogger {
+    nanoseconds getCurrentTime() override { return nanoseconds(systemTime(SYSTEM_TIME_MONOTONIC)); }
+
+    void logInputDeviceUsageReported(const InputDeviceIdentifier& identifier,
+                                     nanoseconds sessionDuration) override {
+        const int32_t durationMillis =
+                std::chrono::duration_cast<std::chrono::milliseconds>(sessionDuration).count();
+        const static std::vector<int32_t> empty;
+
+        ALOGD_IF(DEBUG, "Usage session reported for device: %s", identifier.name.c_str());
+        ALOGD_IF(DEBUG, "    Total duration: %dms", durationMillis);
+
+        util::stats_write(util::INPUTDEVICE_USAGE_REPORTED, identifier.vendor, identifier.product,
+                          identifier.version, linuxBusToInputDeviceBusEnum(identifier.bus),
+                          durationMillis, /*usage_sources=*/empty,
+                          /*usage_durations_per_source=*/empty, /*uids=*/empty,
+                          /*usage_durations_per_uid=*/empty);
+    }
+} sStatsdLogger;
+
+bool isIgnoredInputDeviceId(int32_t deviceId) {
+    switch (deviceId) {
+        case INVALID_INPUT_DEVICE_ID:
+        case VIRTUAL_KEYBOARD_ID:
+            return true;
+        default:
+            return false;
+    }
+}
+
+} // namespace
+
 InputDeviceMetricsCollector::InputDeviceMetricsCollector(InputListenerInterface& listener)
-      : mNextListener(listener){};
+      : InputDeviceMetricsCollector(listener, sStatsdLogger, DEFAULT_USAGE_SESSION_TIMEOUT) {}
+
+InputDeviceMetricsCollector::InputDeviceMetricsCollector(InputListenerInterface& listener,
+                                                         InputDeviceMetricsLogger& logger,
+                                                         nanoseconds usageSessionTimeout)
+      : mNextListener(listener), mLogger(logger), mUsageSessionTimeout(usageSessionTimeout) {}
 
 void InputDeviceMetricsCollector::notifyInputDevicesChanged(
         const NotifyInputDevicesChangedArgs& args) {
+    processUsages();
+    onInputDevicesChanged(args.inputDeviceInfos);
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifyConfigurationChanged(
         const NotifyConfigurationChangedArgs& args) {
+    processUsages();
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifyKey(const NotifyKeyArgs& args) {
+    processUsages();
+    onInputDeviceUsage(DeviceId{args.deviceId}, nanoseconds(args.eventTime));
+
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifyMotion(const NotifyMotionArgs& args) {
+    processUsages();
+    onInputDeviceUsage(DeviceId{args.deviceId}, nanoseconds(args.eventTime));
+
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifySwitch(const NotifySwitchArgs& args) {
+    processUsages();
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifySensor(const NotifySensorArgs& args) {
+    processUsages();
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifyVibratorState(const NotifyVibratorStateArgs& args) {
+    processUsages();
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifyDeviceReset(const NotifyDeviceResetArgs& args) {
+    processUsages();
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::notifyPointerCaptureChanged(
         const NotifyPointerCaptureChangedArgs& args) {
+    processUsages();
     mNextListener.notify(args);
 }
 
 void InputDeviceMetricsCollector::dump(std::string& dump) {
     dump += "InputDeviceMetricsCollector:\n";
+
+    dump += "  Logged device IDs: " + dumpMapKeys(mLoggedDeviceInfos, &toString) + "\n";
+    dump += "  Devices with active usage sessions: " +
+            dumpMapKeys(mActiveUsageSessions, &toString) + "\n";
+}
+
+void InputDeviceMetricsCollector::onInputDevicesChanged(const std::vector<InputDeviceInfo>& infos) {
+    std::map<DeviceId, InputDeviceIdentifier> newDeviceIds;
+
+    for (const InputDeviceInfo& info : infos) {
+        if (isIgnoredInputDeviceId(info.getId())) {
+            continue;
+        }
+        newDeviceIds.emplace(info.getId(), info.getIdentifier());
+    }
+
+    for (auto [deviceId, identifier] : mLoggedDeviceInfos) {
+        if (newDeviceIds.count(deviceId) != 0) {
+            continue;
+        }
+        onInputDeviceRemoved(deviceId, identifier);
+    }
+
+    std::swap(newDeviceIds, mLoggedDeviceInfos);
+}
+
+void InputDeviceMetricsCollector::onInputDeviceRemoved(DeviceId deviceId,
+                                                       const InputDeviceIdentifier& identifier) {
+    // Report usage for that device if there is an active session.
+    auto it = mActiveUsageSessions.find(deviceId);
+    if (it != mActiveUsageSessions.end()) {
+        mLogger.logInputDeviceUsageReported(identifier, it->second.end - it->second.start);
+        mActiveUsageSessions.erase(it);
+    }
+    // We don't remove this from mLoggedDeviceInfos because it will be updated in
+    // onInputDevicesChanged().
+}
+
+void InputDeviceMetricsCollector::onInputDeviceUsage(DeviceId deviceId, nanoseconds eventTime) {
+    if (mLoggedDeviceInfos.count(deviceId) == 0) {
+        // Do not track usage for devices that are not logged.
+        return;
+    }
+
+    auto [it, inserted] = mActiveUsageSessions.try_emplace(deviceId, eventTime, eventTime);
+    if (!inserted) {
+        it->second.end = eventTime;
+    }
+}
+
+void InputDeviceMetricsCollector::processUsages() {
+    const auto usageSessionExpiryTime = mLogger.getCurrentTime() - mUsageSessionTimeout;
+
+    std::vector<DeviceId> completedUsageSessions;
+
+    for (const auto& [deviceId, usageSession] : mActiveUsageSessions) {
+        if (usageSession.end <= usageSessionExpiryTime) {
+            completedUsageSessions.emplace_back(deviceId);
+        }
+    }
+
+    for (DeviceId deviceId : completedUsageSessions) {
+        const auto it = mLoggedDeviceInfos.find(deviceId);
+        LOG_ALWAYS_FATAL_IF(it == mLoggedDeviceInfos.end());
+
+        const auto& session = mActiveUsageSessions[deviceId];
+        mLogger.logInputDeviceUsageReported(it->second, session.end - session.start);
+
+        mActiveUsageSessions.erase(deviceId);
+    }
 }
 
 } // namespace android
diff --git a/services/inputflinger/InputDeviceMetricsCollector.h b/services/inputflinger/InputDeviceMetricsCollector.h
index c959075..c9daa92 100644
--- a/services/inputflinger/InputDeviceMetricsCollector.h
+++ b/services/inputflinger/InputDeviceMetricsCollector.h
@@ -18,6 +18,12 @@
 
 #include "InputListener.h"
 
+#include <ftl/mixins.h>
+#include <input/InputDevice.h>
+#include <chrono>
+#include <map>
+#include <vector>
+
 namespace android {
 
 /**
@@ -34,11 +40,24 @@
     virtual void dump(std::string& dump) = 0;
 };
 
+/** The logging interface for the metrics collector, injected for testing. */
+class InputDeviceMetricsLogger {
+public:
+    virtual std::chrono::nanoseconds getCurrentTime() = 0;
+    virtual void logInputDeviceUsageReported(const InputDeviceIdentifier&,
+                                             std::chrono::nanoseconds duration) = 0;
+    virtual ~InputDeviceMetricsLogger() = default;
+};
+
 class InputDeviceMetricsCollector : public InputDeviceMetricsCollectorInterface {
 public:
     explicit InputDeviceMetricsCollector(InputListenerInterface& listener);
     ~InputDeviceMetricsCollector() override = default;
 
+    // Test constructor
+    InputDeviceMetricsCollector(InputListenerInterface& listener, InputDeviceMetricsLogger& logger,
+                                std::chrono::nanoseconds usageSessionTimeout);
+
     void notifyInputDevicesChanged(const NotifyInputDevicesChangedArgs& args) override;
     void notifyConfigurationChanged(const NotifyConfigurationChangedArgs& args) override;
     void notifyKey(const NotifyKeyArgs& args) override;
@@ -53,6 +72,32 @@
 
 private:
     InputListenerInterface& mNextListener;
+    InputDeviceMetricsLogger& mLogger;
+    const std::chrono::nanoseconds mUsageSessionTimeout;
+
+    // Type-safe wrapper for input device id.
+    struct DeviceId : ftl::Constructible<DeviceId, std::int32_t>,
+                      ftl::Equatable<DeviceId>,
+                      ftl::Orderable<DeviceId> {
+        using Constructible::Constructible;
+    };
+    static std::string toString(const DeviceId& id) {
+        return std::to_string(ftl::to_underlying(id));
+    }
+
+    std::map<DeviceId, InputDeviceIdentifier> mLoggedDeviceInfos;
+
+    struct UsageSession {
+        std::chrono::nanoseconds start;
+        std::chrono::nanoseconds end;
+    };
+    // The input devices that currently have active usage sessions.
+    std::map<DeviceId, UsageSession> mActiveUsageSessions;
+
+    void onInputDevicesChanged(const std::vector<InputDeviceInfo>& infos);
+    void onInputDeviceRemoved(DeviceId deviceId, const InputDeviceIdentifier& identifier);
+    void onInputDeviceUsage(DeviceId deviceId, std::chrono::nanoseconds eventTime);
+    void processUsages();
 };
 
 } // namespace android
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index 52277ff..ec67a1d 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -47,6 +47,7 @@
         "FocusResolver_test.cpp",
         "GestureConverter_test.cpp",
         "HardwareStateConverter_test.cpp",
+        "InputDeviceMetricsCollector_test.cpp",
         "InputMapperTest.cpp",
         "InputProcessor_test.cpp",
         "InputProcessorConverter_test.cpp",
diff --git a/services/inputflinger/tests/InputDeviceMetricsCollector_test.cpp b/services/inputflinger/tests/InputDeviceMetricsCollector_test.cpp
new file mode 100644
index 0000000..d82e426
--- /dev/null
+++ b/services/inputflinger/tests/InputDeviceMetricsCollector_test.cpp
@@ -0,0 +1,264 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "../InputDeviceMetricsCollector.h"
+
+#include <gtest/gtest.h>
+#include <gui/constants.h>
+#include <linux/input.h>
+#include <array>
+#include <tuple>
+
+#include "TestInputListener.h"
+
+namespace android {
+
+using std::chrono_literals::operator""ns;
+using std::chrono::nanoseconds;
+
+namespace {
+
+constexpr auto USAGE_TIMEOUT = 8765309ns;
+constexpr auto TIME = 999999ns;
+
+constexpr int32_t DEVICE_ID = 3;
+constexpr int32_t DEVICE_ID_2 = 4;
+constexpr int32_t VID = 0xFEED;
+constexpr int32_t PID = 0xDEAD;
+constexpr int32_t VERSION = 0xBEEF;
+const std::string DEVICE_NAME = "Half Dome";
+const std::string LOCATION = "California";
+const std::string UNIQUE_ID = "Yosemite";
+
+InputDeviceIdentifier getIdentifier(int32_t id = DEVICE_ID) {
+    InputDeviceIdentifier identifier;
+    identifier.name = DEVICE_NAME + "_" + std::to_string(id);
+    identifier.location = LOCATION;
+    identifier.uniqueId = UNIQUE_ID;
+    identifier.vendor = VID;
+    identifier.product = PID;
+    identifier.version = VERSION;
+    identifier.bus = BUS_USB;
+    return identifier;
+}
+
+InputDeviceInfo generateTestDeviceInfo(int32_t id = DEVICE_ID) {
+    auto info = InputDeviceInfo();
+    info.initialize(id, /*generation=*/1, /*controllerNumber=*/1, getIdentifier(id), "alias",
+                    /*isExternal=*/false, /*hasMic=*/false, ADISPLAY_ID_NONE);
+    info.addSource(AINPUT_SOURCE_TOUCHSCREEN);
+    return info;
+}
+
+} // namespace
+
+// --- InputDeviceMetricsCollectorTest ---
+
+class InputDeviceMetricsCollectorTest : public testing::Test, InputDeviceMetricsLogger {
+protected:
+    TestInputListener mTestListener;
+    InputDeviceMetricsCollector mMetricsCollector{mTestListener, *this, USAGE_TIMEOUT};
+
+    void assertUsageLogged(InputDeviceIdentifier identifier, nanoseconds duration) {
+        ASSERT_GE(mLoggedUsageSessions.size(), 1u);
+        const auto& session = *mLoggedUsageSessions.begin();
+        ASSERT_EQ(identifier, std::get<InputDeviceIdentifier>(session));
+        ASSERT_EQ(duration, std::get<nanoseconds>(session));
+        mLoggedUsageSessions.erase(mLoggedUsageSessions.begin());
+    }
+
+    void assertUsageNotLogged() { ASSERT_TRUE(mLoggedUsageSessions.empty()); }
+
+    void setCurrentTime(nanoseconds time) { mCurrentTime = time; }
+
+    NotifyMotionArgs generateMotionArgs(int32_t deviceId) {
+        PointerProperties pointerProperties{};
+        pointerProperties.id = 0;
+        pointerProperties.toolType = ToolType::FINGER;
+
+        PointerCoords pointerCoords{};
+        pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_X, 100);
+        pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, 200);
+
+        return {/*id=*/0,
+                mCurrentTime.count(),
+                /*readTime=*/0,
+                deviceId,
+                AINPUT_SOURCE_TOUCHSCREEN,
+                /*displayId=*/0,
+                POLICY_FLAG_PASS_TO_USER,
+                AMOTION_EVENT_ACTION_MOVE,
+                /*actionButton=*/0,
+                /*flags=*/0,
+                AMETA_NONE,
+                /*buttonState=*/0,
+                MotionClassification::NONE,
+                AMOTION_EVENT_EDGE_FLAG_NONE,
+                /*pointerCount=*/1,
+                &pointerProperties,
+                &pointerCoords,
+                /*xPrecision=*/0,
+                /*yPrecision=*/0,
+                AMOTION_EVENT_INVALID_CURSOR_POSITION,
+                AMOTION_EVENT_INVALID_CURSOR_POSITION,
+                mCurrentTime.count(),
+                /*videoFrames=*/{}};
+    }
+
+private:
+    std::vector<std::tuple<InputDeviceIdentifier, nanoseconds>> mLoggedUsageSessions;
+    nanoseconds mCurrentTime{TIME};
+
+    nanoseconds getCurrentTime() override { return mCurrentTime; }
+
+    void logInputDeviceUsageReported(const InputDeviceIdentifier& identifier,
+                                     nanoseconds duration) override {
+        mLoggedUsageSessions.emplace_back(identifier, duration);
+    }
+};
+
+TEST_F(InputDeviceMetricsCollectorTest, DontLogUsageWhenDeviceNotRegistered) {
+    // Device was used.
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    mTestListener.assertNotifyMotionWasCalled();
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device was used again after the usage timeout expired, but we still don't log usage.
+    setCurrentTime(TIME + USAGE_TIMEOUT);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    mTestListener.assertNotifyMotionWasCalled();
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+}
+
+TEST_F(InputDeviceMetricsCollectorTest, DontLogUsageForIgnoredDevices) {
+    constexpr static std::array<int32_t, 2> ignoredDevices{
+            {INVALID_INPUT_DEVICE_ID, VIRTUAL_KEYBOARD_ID}};
+
+    for (int32_t ignoredDeviceId : ignoredDevices) {
+        mMetricsCollector.notifyInputDevicesChanged(
+                {/*id=*/0, {generateTestDeviceInfo(ignoredDeviceId)}});
+
+        // Device was used.
+        mMetricsCollector.notifyMotion(generateMotionArgs(ignoredDeviceId));
+        mTestListener.assertNotifyMotionWasCalled();
+        ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+        // Device was used again after the usage timeout expired, but we still don't log usage.
+        setCurrentTime(TIME + USAGE_TIMEOUT);
+        mMetricsCollector.notifyMotion(generateMotionArgs(ignoredDeviceId));
+        mTestListener.assertNotifyMotionWasCalled();
+        ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+        // Remove the ignored device, and ensure we still don't log usage.
+        mMetricsCollector.notifyInputDevicesChanged({/*id=*/0, {}});
+        ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+    }
+}
+
+TEST_F(InputDeviceMetricsCollectorTest, LogsSingleEventUsageSession) {
+    mMetricsCollector.notifyInputDevicesChanged({/*id=*/0, {generateTestDeviceInfo()}});
+
+    // Device was used.
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device was used again after the usage timeout.
+    setCurrentTime(TIME + USAGE_TIMEOUT);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    // The usage session has zero duration because it consisted of only one event.
+    ASSERT_NO_FATAL_FAILURE(assertUsageLogged(getIdentifier(), 0ns));
+}
+
+TEST_F(InputDeviceMetricsCollectorTest, LogsMultipleEventUsageSession) {
+    mMetricsCollector.notifyInputDevicesChanged({/*id=*/0, {generateTestDeviceInfo()}});
+
+    // Device was used.
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device was used again after some time.
+    setCurrentTime(TIME + 21ns);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+
+    setCurrentTime(TIME + 42ns);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+
+    // Device was used again after the usage timeout.
+    setCurrentTime(TIME + 42ns + 2 * USAGE_TIMEOUT);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    ASSERT_NO_FATAL_FAILURE(assertUsageLogged(getIdentifier(), 42ns));
+}
+
+TEST_F(InputDeviceMetricsCollectorTest, RemovingDeviceEndsUsageSession) {
+    mMetricsCollector.notifyInputDevicesChanged({/*id=*/0, {generateTestDeviceInfo()}});
+
+    // Device was used.
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device was used again after some time.
+    setCurrentTime(TIME + 21ns);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+
+    // The device was removed before the usage timeout expired.
+    setCurrentTime(TIME + 42ns);
+    mMetricsCollector.notifyInputDevicesChanged({/*id=*/0, {}});
+    ASSERT_NO_FATAL_FAILURE(assertUsageLogged(getIdentifier(), 21ns));
+}
+
+TEST_F(InputDeviceMetricsCollectorTest, TracksUsageFromDifferentDevicesIndependently) {
+    mMetricsCollector.notifyInputDevicesChanged(
+            {/*id=*/0, {generateTestDeviceInfo(), generateTestDeviceInfo(DEVICE_ID_2)}});
+
+    // Device 1 was used.
+    setCurrentTime(TIME);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    setCurrentTime(TIME + 100ns);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device 2 was used.
+    setCurrentTime(TIME + 200ns);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID_2));
+    setCurrentTime(TIME + 400ns);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID_2));
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device 1 was used after its usage timeout expired. Its usage session is reported.
+    setCurrentTime(TIME + 300ns + USAGE_TIMEOUT);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    ASSERT_NO_FATAL_FAILURE(assertUsageLogged(getIdentifier(DEVICE_ID), 100ns));
+
+    // Device 2 was used.
+    setCurrentTime(TIME + 350ns + USAGE_TIMEOUT);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID_2));
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device 1 was used.
+    setCurrentTime(TIME + 500ns + USAGE_TIMEOUT);
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+
+    // Device 2 is not used for a while, but Device 1 is used again.
+    setCurrentTime(TIME + 400ns + (2 * USAGE_TIMEOUT));
+    mMetricsCollector.notifyMotion(generateMotionArgs(DEVICE_ID));
+    // Since Device 2's usage session ended, its usage should be reported.
+    ASSERT_NO_FATAL_FAILURE(assertUsageLogged(getIdentifier(DEVICE_ID_2), 150ns + USAGE_TIMEOUT));
+
+    ASSERT_NO_FATAL_FAILURE(assertUsageNotLogged());
+}
+
+} // namespace android