diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f5da15fe711..935c1a47f0d 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -6,6 +6,11 @@
 
     <original-package android:name="com.android.settings"/>
 
+    <!-- Permissions for reading or writing battery-related data. -->
+    <permission
+        android:name="com.android.settings.BATTERY_DATA"
+        android:protectionLevel="signature|privileged"/>
+
     <uses-permission android:name="android.permission.REQUEST_NETWORK_SCORES" />
     <uses-permission android:name="android.permission.WRITE_MEDIA_STORAGE" />
     <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
@@ -2961,6 +2966,13 @@
                        android:value="@string/menu_key_battery"/>
         </activity>
 
+        <provider
+            android:name=".fuelgauge.batteryusage.BatteryUsageContentProvider"
+            android:enabled="true"
+            android:exported="true"
+            android:authorities="${applicationId}.battery.usage.provider"
+            android:permission="com.android.settings.BATTERY_DATA"/>
+
         <activity
             android:name="Settings$BatterySaverSettingsActivity"
             android:label="@string/battery_saver"
diff --git a/src/com/android/settings/fuelgauge/batteryusage/BatteryUsageContentProvider.java b/src/com/android/settings/fuelgauge/batteryusage/BatteryUsageContentProvider.java
new file mode 100644
index 00000000000..8d5ba33f8ca
--- /dev/null
+++ b/src/com/android/settings/fuelgauge/batteryusage/BatteryUsageContentProvider.java
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.fuelgauge.batteryusage;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.net.Uri;
+import android.text.TextUtils;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+
+import com.android.settings.fuelgauge.batteryusage.db.BatteryState;
+import com.android.settings.fuelgauge.batteryusage.db.BatteryStateDao;
+import com.android.settings.fuelgauge.batteryusage.db.BatteryStateDatabase;
+
+import java.time.Clock;
+import java.time.Duration;
+
+/** {@link ContentProvider} class to fetch battery usage data. */
+public class BatteryUsageContentProvider extends ContentProvider {
+    private static final String TAG = "BatteryUsageContentProvider";
+
+    // TODO: Updates the duration to a more reasonable value for since-last-full-charge.
+    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+    public static final Duration QUERY_DURATION_HOURS = Duration.ofHours(28);
+
+    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+    public static final String QUERY_KEY_TIMESTAMP = "timestamp";
+
+    /** Codes */
+    private static final int BATTERY_STATE_CODE = 1;
+    private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+
+    static {
+        sUriMatcher.addURI(
+                DatabaseUtils.AUTHORITY,
+                /*path=*/ DatabaseUtils.BATTERY_STATE_TABLE,
+                /*code=*/ BATTERY_STATE_CODE);
+    }
+
+    private Clock mClock;
+    private BatteryStateDao mBatteryStateDao;
+
+    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+    public void setClock(Clock clock) {
+        this.mClock = clock;
+    }
+
+    @Override
+    public boolean onCreate() {
+        if (DatabaseUtils.isWorkProfile(getContext())) {
+            Log.w(TAG, "do not create provider for work profile");
+            return false;
+        }
+        mClock = Clock.systemUTC();
+        mBatteryStateDao = BatteryStateDatabase.getInstance(getContext()).batteryStateDao();
+        Log.w(TAG, "create content provider from " + getCallingPackage());
+        return true;
+    }
+
+    @Nullable
+    @Override
+    public Cursor query(
+            @NonNull Uri uri,
+            @Nullable String[] strings,
+            @Nullable String s,
+            @Nullable String[] strings1,
+            @Nullable String s1) {
+        switch (sUriMatcher.match(uri)) {
+            case BATTERY_STATE_CODE:
+                return getBatteryStates(uri);
+            default:
+                throw new IllegalArgumentException("unknown URI: " + uri);
+        }
+    }
+
+    @Nullable
+    @Override
+    public String getType(@NonNull Uri uri) {
+        return null;
+    }
+
+    @Nullable
+    @Override
+    public Uri insert(@NonNull Uri uri, @Nullable ContentValues contentValues) {
+        switch (sUriMatcher.match(uri)) {
+            case BATTERY_STATE_CODE:
+                try {
+                    mBatteryStateDao.insert(BatteryState.create(contentValues));
+                    return uri;
+                } catch (RuntimeException e) {
+                    Log.e(TAG, "insert() from:" + uri + " error:" + e);
+                    return null;
+                }
+            default:
+                throw new IllegalArgumentException("unknown URI: " + uri);
+        }
+    }
+
+    @Override
+    public int delete(@NonNull Uri uri, @Nullable String s, @Nullable String[] strings) {
+        throw new UnsupportedOperationException("unsupported!");
+    }
+
+    @Override
+    public int update(
+            @NonNull Uri uri,
+            @Nullable ContentValues contentValues,
+            @Nullable String s,
+            @Nullable String[] strings) {
+        throw new UnsupportedOperationException("unsupported!");
+    }
+
+    private Cursor getBatteryStates(Uri uri) {
+        final long defaultTimestamp = mClock.millis() - QUERY_DURATION_HOURS.toMillis();
+        final long queryTimestamp = getQueryTimestamp(uri, defaultTimestamp);
+        return getBatteryStates(uri, queryTimestamp);
+    }
+
+    private Cursor getBatteryStates(Uri uri, long firstTimestamp) {
+        final long timestamp = mClock.millis();
+        Cursor cursor = null;
+        try {
+            cursor = mBatteryStateDao.getCursorAfter(firstTimestamp);
+        } catch (RuntimeException e) {
+            Log.e(TAG, "query() from:" + uri + " error:" + e);
+        }
+        // TODO: Invokes hourly job recheck.
+        Log.w(TAG, "query battery states in " + (mClock.millis() - timestamp) + "/ms");
+        return cursor;
+    }
+
+    // If URI contains query parameter QUERY_KEY_TIMESTAMP, use the value directly.
+    // Otherwise, load the data for QUERY_DURATION_HOURS by default.
+    private long getQueryTimestamp(Uri uri, long defaultTimestamp) {
+        final String firstTimestampString = uri.getQueryParameter(QUERY_KEY_TIMESTAMP);
+        if (TextUtils.isEmpty(firstTimestampString)) {
+            Log.w(TAG, "empty query timestamp");
+            return defaultTimestamp;
+        }
+
+        try {
+            return Long.parseLong(firstTimestampString);
+        } catch (NumberFormatException e) {
+            Log.e(TAG, "invalid query timestamp: " + firstTimestampString, e);
+            return defaultTimestamp;
+        }
+    }
+}
diff --git a/src/com/android/settings/fuelgauge/batteryusage/DatabaseUtils.java b/src/com/android/settings/fuelgauge/batteryusage/DatabaseUtils.java
new file mode 100644
index 00000000000..4ad1ac3df53
--- /dev/null
+++ b/src/com/android/settings/fuelgauge/batteryusage/DatabaseUtils.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.fuelgauge.batteryusage;
+
+import android.content.Context;
+import android.os.UserManager;
+
+/** A utility class to operate battery usage database. */
+public final class DatabaseUtils {
+    private static final String TAG = "DatabaseUtils";
+
+    /** An authority name of the battery content provider. */
+    public static final String AUTHORITY = "com.android.settings.battery.usage.provider";
+    /** A table name for battery usage history. */
+    public static final String BATTERY_STATE_TABLE = "BatteryState";
+
+    /** Returns true if current user is a work profile user. */
+    public static boolean isWorkProfile(Context context) {
+        final UserManager userManager = context.getSystemService(UserManager.class);
+        return userManager.isManagedProfile() && !userManager.isSystemUser();
+    }
+}
diff --git a/tests/robotests/src/com/android/settings/fuelgauge/batteryusage/BatteryUsageContentProviderTest.java b/tests/robotests/src/com/android/settings/fuelgauge/batteryusage/BatteryUsageContentProviderTest.java
new file mode 100644
index 00000000000..4f145c24bc6
--- /dev/null
+++ b/tests/robotests/src/com/android/settings/fuelgauge/batteryusage/BatteryUsageContentProviderTest.java
@@ -0,0 +1,311 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.fuelgauge.batteryusage;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assert.assertThrows;
+
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.fuelgauge.batteryusage.db.BatteryState;
+import com.android.settings.fuelgauge.batteryusage.db.BatteryStateDatabase;
+import com.android.settings.testutils.BatteryTestUtils;
+import com.android.settings.testutils.FakeClock;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+import java.time.Duration;
+import java.util.List;
+
+/** Tests for {@link BatteryUsageContentProvider}. */
+@RunWith(RobolectricTestRunner.class)
+public final class BatteryUsageContentProviderTest {
+    private static final Uri VALID_BATTERY_STATE_CONTENT_URI =
+            new Uri.Builder()
+                    .scheme(ContentResolver.SCHEME_CONTENT)
+                    .authority(DatabaseUtils.AUTHORITY)
+                    .appendPath(DatabaseUtils.BATTERY_STATE_TABLE)
+                    .build();
+
+    private Context mContext;
+    private BatteryUsageContentProvider mProvider;
+
+    @Before
+    public void setUp() {
+        mContext = ApplicationProvider.getApplicationContext();
+        mProvider = new BatteryUsageContentProvider();
+        mProvider.attachInfo(mContext, /*info=*/ null);
+        BatteryTestUtils.setUpBatteryStateDatabase(mContext);
+    }
+
+    @Test
+    public void onCreate_withoutWorkProfileMode_returnsTrue() {
+        assertThat(mProvider.onCreate()).isTrue();
+    }
+
+    @Test
+    public void onCreate_withWorkProfileMode_returnsFalse() {
+        BatteryTestUtils.setWorkProfile(mContext);
+        assertThat(mProvider.onCreate()).isFalse();
+    }
+
+    @Test
+    public void queryAndInsert_incorrectContentUri_throwsIllegalArgumentException() {
+        final Uri.Builder builder =
+                new Uri.Builder()
+                        .scheme(ContentResolver.SCHEME_CONTENT)
+                        .authority(DatabaseUtils.AUTHORITY)
+                        .appendPath(DatabaseUtils.BATTERY_STATE_TABLE + "/0");
+        final Uri uri = builder.build();
+        mProvider.onCreate();
+
+        assertThrows(
+                IllegalArgumentException.class,
+                () ->
+                        mProvider.query(
+                                uri, /*strings=*/ null, /*s=*/ null, /*strings1=*/ null,
+                                /*s1=*/ null));
+        assertThrows(
+                IllegalArgumentException.class,
+                () -> mProvider.insert(uri, /*contentValues=*/ null));
+    }
+
+    @Test
+    public void queryAndInsert_incorrectAuthority_throwsIllegalArgumentException() {
+        final Uri.Builder builder =
+                new Uri.Builder()
+                        .scheme(ContentResolver.SCHEME_CONTENT)
+                        .authority(DatabaseUtils.AUTHORITY + ".debug")
+                        .appendPath(DatabaseUtils.BATTERY_STATE_TABLE);
+        final Uri uri = builder.build();
+        mProvider.onCreate();
+
+        assertThrows(
+                IllegalArgumentException.class,
+                () ->
+                        mProvider.query(
+                                uri, /*strings=*/ null, /*s=*/ null, /*strings1=*/ null,
+                                /*s1=*/ null));
+        assertThrows(
+                IllegalArgumentException.class,
+                () -> mProvider.insert(uri, /*contentValues=*/ null));
+    }
+
+    @Test
+    public void query_batteryState_returnsExpectedResult() throws Exception {
+        mProvider.onCreate();
+        final Duration currentTime = Duration.ofHours(52);
+        final long expiredTimeCutoff = currentTime.toMillis()
+                - BatteryUsageContentProvider.QUERY_DURATION_HOURS.toMillis();
+        testQueryBatteryState(currentTime, expiredTimeCutoff, /*hasQueryTimestamp=*/ false);
+    }
+
+    @Test
+    public void query_batteryStateTimestamp_returnsExpectedResult() throws Exception {
+        mProvider.onCreate();
+        final Duration currentTime = Duration.ofHours(52);
+        final long expiredTimeCutoff = currentTime.toMillis() - Duration.ofHours(10).toMillis();
+        testQueryBatteryState(currentTime, expiredTimeCutoff, /*hasQueryTimestamp=*/ true);
+    }
+
+    @Test
+    public void query_incorrectParameterFormat_returnsExpectedResult() throws Exception {
+        mProvider.onCreate();
+        final Duration currentTime = Duration.ofHours(52);
+        final long expiredTimeCutoff =
+                currentTime.toMillis()
+                        - BatteryUsageContentProvider.QUERY_DURATION_HOURS.toMillis();
+        testQueryBatteryState(
+                currentTime,
+                expiredTimeCutoff,
+                /*hasQueryTimestamp=*/ false,
+                /*customParameter=*/ "invalid number format");
+    }
+
+    @Test
+    public void insert_batteryState_returnsExpectedResult() {
+        mProvider.onCreate();
+        ContentValues values = new ContentValues();
+        values.put("uid", Long.valueOf(101L));
+        values.put("userId", Long.valueOf(1001L));
+        values.put("appLabel", new String("Settings"));
+        values.put("packageName", new String("com.android.settings"));
+        values.put("timestamp", Long.valueOf(2100021L));
+        values.put("isHidden", Boolean.valueOf(true));
+        values.put("totalPower", Double.valueOf(99.0));
+        values.put("consumePower", Double.valueOf(9.0));
+        values.put("percentOfTotal", Double.valueOf(0.9));
+        values.put("foregroundUsageTimeInMs", Long.valueOf(1000));
+        values.put("backgroundUsageTimeInMs", Long.valueOf(2000));
+        values.put("drainType", Integer.valueOf(1));
+        values.put("consumerType", Integer.valueOf(2));
+        values.put("batteryLevel", Integer.valueOf(51));
+        values.put("batteryStatus", Integer.valueOf(2));
+        values.put("batteryHealth", Integer.valueOf(3));
+
+        final Uri uri = mProvider.insert(VALID_BATTERY_STATE_CONTENT_URI, values);
+
+        assertThat(uri).isEqualTo(VALID_BATTERY_STATE_CONTENT_URI);
+        // Verifies the BatteryState content.
+        final List<BatteryState> states =
+                BatteryStateDatabase.getInstance(mContext).batteryStateDao().getAllAfter(0);
+        assertThat(states).hasSize(1);
+        assertThat(states.get(0).uid).isEqualTo(101L);
+        assertThat(states.get(0).userId).isEqualTo(1001L);
+        assertThat(states.get(0).appLabel).isEqualTo("Settings");
+        assertThat(states.get(0).packageName).isEqualTo("com.android.settings");
+        assertThat(states.get(0).isHidden).isTrue();
+        assertThat(states.get(0).timestamp).isEqualTo(2100021L);
+        assertThat(states.get(0).totalPower).isEqualTo(99.0);
+        assertThat(states.get(0).consumePower).isEqualTo(9.0);
+        assertThat(states.get(0).percentOfTotal).isEqualTo(0.9);
+        assertThat(states.get(0).foregroundUsageTimeInMs).isEqualTo(1000);
+        assertThat(states.get(0).backgroundUsageTimeInMs).isEqualTo(2000);
+        assertThat(states.get(0).drainType).isEqualTo(1);
+        assertThat(states.get(0).consumerType).isEqualTo(2);
+        assertThat(states.get(0).batteryLevel).isEqualTo(51);
+        assertThat(states.get(0).batteryStatus).isEqualTo(2);
+        assertThat(states.get(0).batteryHealth).isEqualTo(3);
+    }
+
+    @Test
+    public void insert_partialFieldsContentValues_returnsExpectedResult() {
+        mProvider.onCreate();
+        final ContentValues values = new ContentValues();
+        values.put("packageName", new String("fake_data"));
+        values.put("timestamp", Long.valueOf(2100022L));
+        values.put("batteryLevel", Integer.valueOf(52));
+        values.put("batteryStatus", Integer.valueOf(3));
+        values.put("batteryHealth", Integer.valueOf(2));
+
+        final Uri uri = mProvider.insert(VALID_BATTERY_STATE_CONTENT_URI, values);
+
+        assertThat(uri).isEqualTo(VALID_BATTERY_STATE_CONTENT_URI);
+        // Verifies the BatteryState content.
+        final List<BatteryState> states =
+                BatteryStateDatabase.getInstance(mContext).batteryStateDao().getAllAfter(0);
+        assertThat(states).hasSize(1);
+        assertThat(states.get(0).packageName).isEqualTo("fake_data");
+        assertThat(states.get(0).timestamp).isEqualTo(2100022L);
+        assertThat(states.get(0).batteryLevel).isEqualTo(52);
+        assertThat(states.get(0).batteryStatus).isEqualTo(3);
+        assertThat(states.get(0).batteryHealth).isEqualTo(2);
+    }
+
+    @Test
+    public void delete_throwsUnsupportedOperationException() {
+        assertThrows(
+                UnsupportedOperationException.class,
+                () -> mProvider.delete(/*uri=*/ null, /*s=*/ null, /*strings=*/ null));
+    }
+
+    @Test
+    public void update_throwsUnsupportedOperationException() {
+        assertThrows(
+                UnsupportedOperationException.class,
+                () ->
+                        mProvider.update(
+                                /*uri=*/ null, /*contentValues=*/ null, /*s=*/ null,
+                                /*strings=*/ null));
+    }
+
+    private void testQueryBatteryState(
+            Duration currentTime, long expiredTimeCutoff, boolean hasQueryTimestamp)
+            throws Exception {
+        testQueryBatteryState(currentTime, expiredTimeCutoff, hasQueryTimestamp, null);
+    }
+
+    private void testQueryBatteryState(
+            Duration currentTime,
+            long expiredTimeCutoff,
+            boolean hasQueryTimestamp,
+            String customParameter)
+            throws Exception {
+        mProvider.onCreate();
+        final FakeClock fakeClock = new FakeClock();
+        fakeClock.setCurrentTime(currentTime);
+        mProvider.setClock(fakeClock);
+        // Inserts some expired testing data.
+        BatteryTestUtils.insertDataToBatteryStateDatabase(
+                mContext, expiredTimeCutoff - 1, "com.android.sysui1");
+        BatteryTestUtils.insertDataToBatteryStateDatabase(
+                mContext, expiredTimeCutoff - 2, "com.android.sysui2");
+        BatteryTestUtils.insertDataToBatteryStateDatabase(
+                mContext, expiredTimeCutoff - 3, "com.android.sysui3");
+        // Inserts some valid testing data.
+        final String packageName1 = "com.android.settings1";
+        final String packageName2 = "com.android.settings2";
+        final String packageName3 = "com.android.settings3";
+        BatteryTestUtils.insertDataToBatteryStateDatabase(
+                mContext, currentTime.toMillis(), packageName1);
+        BatteryTestUtils.insertDataToBatteryStateDatabase(
+                mContext, expiredTimeCutoff + 2, packageName2);
+        BatteryTestUtils.insertDataToBatteryStateDatabase(
+                mContext, expiredTimeCutoff, packageName3);
+
+        final Uri.Builder builder =
+                new Uri.Builder()
+                        .scheme(ContentResolver.SCHEME_CONTENT)
+                        .authority(DatabaseUtils.AUTHORITY)
+                        .appendPath(DatabaseUtils.BATTERY_STATE_TABLE);
+        if (customParameter != null) {
+            builder.appendQueryParameter(
+                    BatteryUsageContentProvider.QUERY_KEY_TIMESTAMP, customParameter);
+        } else if (hasQueryTimestamp) {
+            builder.appendQueryParameter(
+                    BatteryUsageContentProvider.QUERY_KEY_TIMESTAMP,
+                    Long.toString(expiredTimeCutoff));
+        }
+        final Uri batteryStateQueryContentUri = builder.build();
+
+        final Cursor cursor =
+                mProvider.query(
+                        batteryStateQueryContentUri,
+                        /*strings=*/ null,
+                        /*s=*/ null,
+                        /*strings1=*/ null,
+                        /*s1=*/ null);
+
+        // Verifies the result not include expired data.
+        assertThat(cursor.getCount()).isEqualTo(3);
+        final int packageNameIndex = cursor.getColumnIndex("packageName");
+        // Verifies the first data package name.
+        cursor.moveToFirst();
+        final String actualPackageName1 = cursor.getString(packageNameIndex);
+        assertThat(actualPackageName1).isEqualTo(packageName1);
+        // Verifies the second data package name.
+        cursor.moveToNext();
+        final String actualPackageName2 = cursor.getString(packageNameIndex);
+        assertThat(actualPackageName2).isEqualTo(packageName2);
+        // Verifies the third data package name.
+        cursor.moveToNext();
+        final String actualPackageName3 = cursor.getString(packageNameIndex);
+        assertThat(actualPackageName3).isEqualTo(packageName3);
+        cursor.close();
+        // TODO: add verification for recheck broadcast.
+    }
+}
diff --git a/tests/robotests/src/com/android/settings/testutils/FakeClock.java b/tests/robotests/src/com/android/settings/testutils/FakeClock.java
new file mode 100644
index 00000000000..946d0515340
--- /dev/null
+++ b/tests/robotests/src/com/android/settings/testutils/FakeClock.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.testutils;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.ZoneId;
+
+/** A fake {@link Clock} class for testing. */
+public final class FakeClock extends Clock {
+    private long mCurrentTimeMillis;
+
+    public FakeClock() {}
+
+    /** Sets the time in millis for {@link Clock#millis()} method. */
+    public void setCurrentTime(Duration duration) {
+        mCurrentTimeMillis = duration.toMillis();
+    }
+
+    @Override
+    public ZoneId getZone() {
+        throw new UnsupportedOperationException("unsupported!");
+    }
+
+    @Override
+    public Clock withZone(ZoneId zone) {
+        throw new UnsupportedOperationException("unsupported!");
+    }
+
+    @Override
+    public Instant instant() {
+        throw new UnsupportedOperationException("unsupported!");
+    }
+
+    @Override
+    public long millis() {
+        return mCurrentTimeMillis;
+    }
+}