android/app/UiModeManager.java

/*
 * Copyright (C) 2010 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 android.app;

import static android.app.Flags.enableNightModeBinderCache;

import android.annotation.CallbackExecutor;
import android.annotation.FlaggedApi;
import android.annotation.FloatRange;
import android.annotation.IntDef;
import android.annotation.IntRange;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.RequiresPermission;
import android.annotation.SystemApi;
import android.annotation.SystemService;
import android.annotation.TestApi;
import android.compat.annotation.UnsupportedAppUsage;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Binder;
import android.os.IpcDataCache;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.ServiceManager.ServiceNotFoundException;
import android.util.ArrayMap;
import android.util.ArraySet;
import android.util.Log;
import android.util.Slog;

import com.android.internal.annotations.GuardedBy;
import com.android.internal.util.function.pooled.PooledLambda;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.ref.WeakReference;
import java.time.LocalTime;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.stream.Stream;

/**
 * This class provides access to the system uimode services.  These services
 * allow applications to control UI modes of the device.
 * It provides functionality to disable the car mode and it gives access to the
 * night mode settings.
 *
 * <p>These facilities are built on top of the underlying
 * {@link android.content.Intent#ACTION_DOCK_EVENT} broadcasts that are sent when the user
 * physical places the device into and out of a dock.  When that happens,
 * the UiModeManager switches the system {@link android.content.res.Configuration}
 * to the appropriate UI mode, sends broadcasts about the mode switch, and
 * starts the corresponding mode activity if appropriate.  See the
 * broadcasts {@link #ACTION_ENTER_CAR_MODE} and
 * {@link #ACTION_ENTER_DESK_MODE} for more information.
 *
 * <p>In addition, the user may manually switch the system to car mode without
 * physically being in a dock.  While in car mode -- whether by manual action
 * from the user or being physically placed in a dock -- a notification is
 * displayed allowing the user to exit dock mode.  Thus the dock mode
 * represented here may be different than the current state of the underlying
 * dock event broadcast.
 */
@SystemService(Context.UI_MODE_SERVICE)
public class UiModeManager {

    private static final String TAG = "UiModeManager";


    /**
     * A listener with a single method that is invoked whenever the packages projecting using the
     * {@link ProjectionType}s for which it is registered change.
     *
     * @hide
     */
    @SystemApi
    public interface OnProjectionStateChangedListener {
        /**
         * Callback invoked when projection state changes for a {@link ProjectionType} for which
         * this listener was added.
         * @param projectionType the listened-for {@link ProjectionType}s that have changed
         * @param packageNames the {@link Set} of package names that have currently set those
         *     {@link ProjectionType}s.
         */
        void onProjectionStateChanged(@ProjectionType int projectionType,
                @NonNull Set<String> packageNames);
    }

    /**
     * Listener for the UI contrast. To listen for changes to
     * the UI contrast on the device, implement this interface and
     * register it with the system by calling {@link #addContrastChangeListener}.
     */
    public interface ContrastChangeListener {

        /**
         * Called when the color contrast enabled state changes.
         *
         * @param contrast The color contrast as in {@link #getContrast}
         */
        void onContrastChanged(@FloatRange(from = -1.0f, to = 1.0f) float contrast);
    }

    /**
     * Broadcast sent when the device's UI has switched to car mode, either
     * by being placed in a car dock or explicit action of the user.  After
     * sending the broadcast, the system will start the intent
     * {@link android.content.Intent#ACTION_MAIN} with category
     * {@link android.content.Intent#CATEGORY_CAR_DOCK}
     * to display the car UI, which typically what an application would
     * implement to provide their own interface.  However, applications can
     * also monitor this Intent in order to be informed of mode changes or
     * prevent the normal car UI from being displayed by setting the result
     * of the broadcast to {@link Activity#RESULT_CANCELED}.
     * <p>
     * This intent is broadcast when {@link #getCurrentModeType()} transitions to
     * {@link Configuration#UI_MODE_TYPE_CAR} from some other ui mode.
     */
    public static String ACTION_ENTER_CAR_MODE = "android.app.action.ENTER_CAR_MODE";

    /**
     * Broadcast sent when an app has entered car mode using either {@link #enableCarMode(int)} or
     * {@link #enableCarMode(int, int)}.
     * <p>
     * Unlike {@link #ACTION_ENTER_CAR_MODE}, which is only sent when the global car mode state
     * (i.e. {@link #getCurrentModeType()}) transitions to {@link Configuration#UI_MODE_TYPE_CAR},
     * this intent is sent any time an app declares it has entered car mode.  Thus, this intent is
     * intended for use by a component which needs to know not only when the global car mode state
     * changed, but also when the highest priority app declaring car mode has changed.
     * <p>
     * This broadcast includes the package name of the app which requested to enter car mode in
     * {@link #EXTRA_CALLING_PACKAGE}.  The priority the app entered car mode at is specified in
     * {@link #EXTRA_PRIORITY}.
     * <p>
     * This is primarily intended to be received by other components of the Android OS.
     * <p>
     * Receiver requires permission: {@link android.Manifest.permission.HANDLE_CAR_MODE_CHANGES}
     * @hide
     */
    @SystemApi
    public static final String ACTION_ENTER_CAR_MODE_PRIORITIZED =
            "android.app.action.ENTER_CAR_MODE_PRIORITIZED";

    /**
     * Broadcast sent when the device's UI has switch away from car mode back
     * to normal mode.  Typically used by a car mode app, to dismiss itself
     * when the user exits car mode.
     * <p>
     * This intent is broadcast when {@link #getCurrentModeType()} transitions from
     * {@link Configuration#UI_MODE_TYPE_CAR} to some other ui mode.
     */
    public static String ACTION_EXIT_CAR_MODE = "android.app.action.EXIT_CAR_MODE";

    /**
     * Broadcast sent when an app has exited car mode using {@link #disableCarMode(int)}.
     * <p>
     * Unlike {@link #ACTION_EXIT_CAR_MODE}, which is only sent when the global car mode state
     * (i.e. {@link #getCurrentModeType()}) transitions to a non-car mode state such as
     * {@link Configuration#UI_MODE_TYPE_NORMAL}, this intent is sent any time an app declares it
     * has exited car mode.  Thus, this intent is intended for use by a component which needs to
     * know not only when the global car mode state changed, but also when the highest priority app
     * declaring car mode has changed.
     * <p>
     * This broadcast includes the package name of the app which requested to exit car mode in
     * {@link #EXTRA_CALLING_PACKAGE}.  The priority the app originally entered car mode at is
     * specified in {@link #EXTRA_PRIORITY}.
     * <p>
     * If {@link #DISABLE_CAR_MODE_ALL_PRIORITIES} is used when disabling car mode (i.e. this is
     * initiated by the user via the persistent car mode notification), this broadcast is sent once
     * for each priority level for which car mode is being disabled.
     * <p>
     * This is primarily intended to be received by other components of the Android OS.
     * <p>
     * Receiver requires permission: {@link android.Manifest.permission.HANDLE_CAR_MODE_CHANGES}
     * @hide
     */
    @SystemApi
    public static final String ACTION_EXIT_CAR_MODE_PRIORITIZED =
            "android.app.action.EXIT_CAR_MODE_PRIORITIZED";

    /**
     * Broadcast sent when the device's UI has switched to desk mode,
     * by being placed in a desk dock.  After
     * sending the broadcast, the system will start the intent
     * {@link android.content.Intent#ACTION_MAIN} with category
     * {@link android.content.Intent#CATEGORY_DESK_DOCK}
     * to display the desk UI, which typically what an application would
     * implement to provide their own interface.  However, applications can
     * also monitor this Intent in order to be informed of mode changes or
     * prevent the normal desk UI from being displayed by setting the result
     * of the broadcast to {@link Activity#RESULT_CANCELED}.
     */
    public static String ACTION_ENTER_DESK_MODE = "android.app.action.ENTER_DESK_MODE";

    /**
     * Broadcast sent when the device's UI has switched away from desk mode back
     * to normal mode.  Typically used by a desk mode app, to dismiss itself
     * when the user exits desk mode.
     */
    public static String ACTION_EXIT_DESK_MODE = "android.app.action.EXIT_DESK_MODE";

    /**
     * String extra used with {@link #ACTION_ENTER_CAR_MODE_PRIORITIZED} and
     * {@link #ACTION_EXIT_CAR_MODE_PRIORITIZED} to indicate the package name of the app which
     * requested to enter or exit car mode.
     * @hide
     */
    @SystemApi
    public static final String EXTRA_CALLING_PACKAGE = "android.app.extra.CALLING_PACKAGE";

    /**
     * Integer extra used with {@link #ACTION_ENTER_CAR_MODE_PRIORITIZED} and
     * {@link #ACTION_EXIT_CAR_MODE_PRIORITIZED} to indicate the priority level at which car mode
     * is being disabled.
     * @hide
     */
    @SystemApi
    public static final String EXTRA_PRIORITY = "android.app.extra.PRIORITY";

    /** @hide */
    @IntDef(prefix = { "MODE_" }, value = {
            MODE_NIGHT_AUTO,
            MODE_NIGHT_CUSTOM,
            MODE_NIGHT_NO,
            MODE_NIGHT_YES
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface NightMode {}

    /**
     * Constant for {@link #setNightMode(int)} and {@link #getNightMode()}:
     * automatically switch night mode on and off based on the time.
     */
    public static final int MODE_NIGHT_AUTO = 0;

    /**
     * Constant for {@link #setNightMode(int)} and {@link #getNightMode()}:
     * automatically switch night mode on and off based on the time.
     */
    public static final int MODE_NIGHT_CUSTOM = 3;

    /**
     * Constant for {@link #setNightMode(int)} and {@link #getNightMode()}:
     * never run in night mode.
     */
    public static final int MODE_NIGHT_NO = 1;

    /**
     * Constant for {@link #setNightMode(int)} and {@link #getNightMode()}:
     * always run in night mode.
     */
    public static final int MODE_NIGHT_YES = 2;

    /** @hide */
    @IntDef(prefix = { "MODE_ATTENTION_THEME_OVERLAY_" }, value = {
            MODE_ATTENTION_THEME_OVERLAY_OFF,
            MODE_ATTENTION_THEME_OVERLAY_NIGHT,
            MODE_ATTENTION_THEME_OVERLAY_DAY
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface AttentionModeThemeOverlayType {}

    /** @hide */
    @IntDef(prefix = { "MODE_ATTENTION_THEME_OVERLAY_" }, value = {
            MODE_ATTENTION_THEME_OVERLAY_OFF,
            MODE_ATTENTION_THEME_OVERLAY_NIGHT,
            MODE_ATTENTION_THEME_OVERLAY_DAY,
            MODE_ATTENTION_THEME_OVERLAY_UNKNOWN
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface AttentionModeThemeOverlayReturnType {}

    /**
     * Constant for {@link #setAttentionModeThemeOverlay(int)} (int)} and {@link
     * #getAttentionModeThemeOverlay()}: Keeps night mode as set by {@link #setNightMode(int)}.
     * @hide
     */
    @FlaggedApi(Flags.FLAG_MODES_API)
    @TestApi
    public static final int MODE_ATTENTION_THEME_OVERLAY_OFF = 1000;

    /**
     * Constant for {@link #setAttentionModeThemeOverlay(int)} (int)} and {@link
     * #getAttentionModeThemeOverlay()}: Maintains night mode always on.
     * @hide
     */
    @FlaggedApi(Flags.FLAG_MODES_API)
    @TestApi
    public static final int MODE_ATTENTION_THEME_OVERLAY_NIGHT = 1001;

    /**
     * Constant for {@link #setAttentionModeThemeOverlay(int)} (int)} and {@link
     * #getAttentionModeThemeOverlay()}: Maintains night mode always off (Light).
     * @hide
     */
    @FlaggedApi(Flags.FLAG_MODES_API)
    @TestApi
    public static final int MODE_ATTENTION_THEME_OVERLAY_DAY = 1002;

    /**
     * Constant for {@link #getAttentionModeThemeOverlay()}: Error communication with server.
     * @hide
     */
    @FlaggedApi(Flags.FLAG_MODES_API)
    @TestApi
    public static final int MODE_ATTENTION_THEME_OVERLAY_UNKNOWN = -1;

    /**
     * Granular types for {@link #setNightModeCustomType(int)}
     * @hide
     */
    @IntDef(prefix = { "MODE_NIGHT_CUSTOM_TYPE_" }, value = {
            MODE_NIGHT_CUSTOM_TYPE_SCHEDULE,
            MODE_NIGHT_CUSTOM_TYPE_BEDTIME,
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface NightModeCustomType {}

    /**
     * Granular types for {@link #getNightModeCustomType()}
     * @hide
     */
    @IntDef(prefix = { "MODE_NIGHT_CUSTOM_TYPE_" }, value = {
            MODE_NIGHT_CUSTOM_TYPE_UNKNOWN,
            MODE_NIGHT_CUSTOM_TYPE_SCHEDULE,
            MODE_NIGHT_CUSTOM_TYPE_BEDTIME,
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface NightModeCustomReturnType {}

    /**
     * A granular type for {@link #MODE_NIGHT_CUSTOM} which is unknown.
     * <p>
     * This is the default value when the night mode is set to value other than
     * {@link #MODE_NIGHT_CUSTOM}.
     * @hide
     */
    @SystemApi
    public static final int MODE_NIGHT_CUSTOM_TYPE_UNKNOWN = -1;

    /**
     * A granular type for {@link #MODE_NIGHT_CUSTOM} which is based on a custom schedule.
     * <p>
     * This is the default value when night mode is set to {@link #MODE_NIGHT_CUSTOM} unless the
     * the night mode custom type is specified by calling {@link #setNightModeCustomType(int)}.
     * @hide
     */
    @SystemApi
    public static final int MODE_NIGHT_CUSTOM_TYPE_SCHEDULE = 0;

    /**
     * A granular type for {@link #MODE_NIGHT_CUSTOM} which is based on the bedtime schedule.
     * @hide
     */
    @SystemApi
    public static final int MODE_NIGHT_CUSTOM_TYPE_BEDTIME = 1;

    private static Globals sGlobals;

    /**
     * Context required for getting the opPackageName of API caller; maybe be {@code null} if the
     * old constructor marked with UnSupportedAppUsage is used.
     */
    private @Nullable Context mContext;

    private final Object mLock = new Object();
    /**
     * Map that stores internally created {@link InnerListener} objects keyed by their corresponding
     * externally provided callback objects.
     */
    @GuardedBy("mLock")
    private final Map<OnProjectionStateChangedListener, InnerListener>
            mProjectionStateListenerMap = new ArrayMap<>();

    /**
     * Resource manager that prevents memory leakage of Contexts via binder objects if clients
     * fail to remove listeners.
     */
    @GuardedBy("mLock")
    private final OnProjectionStateChangedListenerResourceManager
            mOnProjectionStateChangedListenerResourceManager =
            new OnProjectionStateChangedListenerResourceManager();

    private static class Globals extends IUiModeManagerCallback.Stub {

        private final IUiModeManager mService;
        private final Object mGlobalsLock = new Object();

        private float mContrast = ContrastUtils.CONTRAST_DEFAULT_VALUE;

        /**
         * Map that stores user provided {@link ContrastChangeListener} callbacks,
         * and the executors on which these callbacks should be called.
         */
        private final ArrayMap<ContrastChangeListener, Executor>
                mContrastChangeListeners = new ArrayMap<>();

        Globals(IUiModeManager service) {
            mService = service;
            try {
                mService.addCallback(this);
                mContrast = mService.getContrast();
            } catch (RemoteException e) {
                Log.e(TAG, "Setup failed: UiModeManagerService is dead", e);
            }
        }

        private float getContrast() {
            synchronized (mGlobalsLock) {
                return mContrast;
            }
        }

        private void addContrastChangeListener(ContrastChangeListener listener, Executor executor) {
            synchronized (mGlobalsLock) {
                mContrastChangeListeners.put(listener, executor);
            }
        }

        private void removeContrastChangeListener(ContrastChangeListener listener) {
            synchronized (mGlobalsLock) {
                mContrastChangeListeners.remove(listener);
            }
        }

        @Override
        public void notifyContrastChanged(float contrast) {
            synchronized (mGlobalsLock) {
                // if value changed in the settings, update the cached value and notify listeners
                if (Math.abs(mContrast - contrast) < 1e-10) return;
                mContrast = contrast;
                mContrastChangeListeners.forEach((listener, executor) -> executor.execute(
                        () -> listener.onContrastChanged(contrast)));
            }
        }
    }

    /**
     * Define constants and conversions between {@link ContrastLevel}s and contrast values.
     * <p>
     * Contrast values are floats defined in [-1, 1], as defined in {@link #getContrast}.
     * This is the official data type for contrast;
     * all methods from the public API return contrast values.
     * </p>
     * <p>
     * {@code ContrastLevel}, on the other hand, is an internal-only enumeration of contrasts that
     * can be set from the system ui. Each {@code ContrastLevel} has an associated contrast value.
     * </p>
     * <p>
     * Currently, a user chan chose from three contrast levels:
     * <ul>
     *     <li>{@link #CONTRAST_LEVEL_STANDARD}, corresponding to the default contrast value 0f</li>
     *     <li>{@link #CONTRAST_LEVEL_MEDIUM}, corresponding to the contrast value 0.5f</li>
     *     <li>{@link #CONTRAST_LEVEL_HIGH}, corresponding to the maximum contrast value 1f</li>
     * </ul>
     * </p>
     *
     * @hide
     */
    public static class ContrastUtils {

        private static final float CONTRAST_MIN_VALUE = -1f;
        private static final float CONTRAST_MAX_VALUE = 1f;
        public static final float CONTRAST_DEFAULT_VALUE = 0f;

        @IntDef(flag = true, prefix = { "CONTRAST_LEVEL_" }, value = {
                CONTRAST_LEVEL_STANDARD,
                CONTRAST_LEVEL_MEDIUM,
                CONTRAST_LEVEL_HIGH
        })
        @Retention(RetentionPolicy.SOURCE)
        public @interface ContrastLevel {}

        public static final int CONTRAST_LEVEL_STANDARD = 0;
        public static final int CONTRAST_LEVEL_MEDIUM = 1;
        public static final int CONTRAST_LEVEL_HIGH = 2;

        private static Stream<Integer> allContrastLevels() {
            return Stream.of(CONTRAST_LEVEL_STANDARD, CONTRAST_LEVEL_MEDIUM, CONTRAST_LEVEL_HIGH);
        }

        /**
         * Convert a contrast value in [-1, 1] to its associated {@link ContrastLevel}
         */
        public static @ContrastLevel int toContrastLevel(float contrast) {
            if (contrast < CONTRAST_MIN_VALUE || contrast > CONTRAST_MAX_VALUE) {
                throw new IllegalArgumentException("contrast values should be in [-1, 1]");
            }
            return allContrastLevels().min(Comparator.comparingDouble(contrastLevel ->
                    Math.abs(contrastLevel - 2 * contrast))).orElseThrow();
        }

        /**
         * Convert a {@link ContrastLevel} to its associated contrast value in [-1, 1]
         */
        public static float fromContrastLevel(@ContrastLevel int contrastLevel) {
            if (allContrastLevels().noneMatch(level -> level == contrastLevel)) {
                throw new IllegalArgumentException("unrecognized contrast level: " + contrastLevel);
            }
            return contrastLevel / 2f;
        }
    }

    @UnsupportedAppUsage
    /*package*/ UiModeManager() throws ServiceNotFoundException {
        this(null /* context */);
    }

    /*package*/ UiModeManager(Context context) throws ServiceNotFoundException {
        IUiModeManager service = IUiModeManager.Stub.asInterface(
                ServiceManager.getServiceOrThrow(Context.UI_MODE_SERVICE));
        mContext = context;
        if (service == null) return;
        synchronized (mLock) {
            if (sGlobals == null) sGlobals = new Globals(service);
        }
    }

    /**
     * Flag for use with {@link #enableCarMode(int)}: go to the car
     * home activity as part of the enable.  Enabling this way ensures
     * a clean transition between the current activity (in non-car-mode) and
     * the car home activity that will serve as home while in car mode.  This
     * will switch to the car home activity even if we are already in car mode.
     */
    public static final int ENABLE_CAR_MODE_GO_CAR_HOME = 0x0001;

    /**
     * Flag for use with {@link #enableCarMode(int)}: allow sleep mode while in car mode.
     * By default, when this flag is not set, the system may hold a full wake lock to keep the
     * screen turned on and prevent the system from entering sleep mode while in car mode.
     * Setting this flag disables such behavior and the system may enter sleep mode
     * if there is no other user activity and no other wake lock held.
     * Setting this flag can be relevant for a car dock application that does not require the
     * screen kept on.
     */
    public static final int ENABLE_CAR_MODE_ALLOW_SLEEP = 0x0002;

    /** @hide */
    @IntDef(prefix = {"ENABLE_CAR_MODE_"}, value = {
            ENABLE_CAR_MODE_GO_CAR_HOME,
            ENABLE_CAR_MODE_ALLOW_SLEEP
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface EnableCarMode {}

    /**
     * Force device into car mode, like it had been placed in the car dock.
     * This will cause the device to switch to the car home UI as part of
     * the mode switch.
     * @param flags Must be 0.
     */
    public void enableCarMode(int flags) {
        enableCarMode(DEFAULT_PRIORITY, flags);
    }

    /**
     * Force device into car mode, like it had been placed in the car dock.  This will cause the
     * device to switch to the car home UI as part of the mode switch.
     * <p>
     * An app may request to enter car mode when the system is already in car mode.  The app may
     * specify a "priority" when entering car mode.  The device will remain in car mode
     * (i.e. {@link #getCurrentModeType()} is {@link Configuration#UI_MODE_TYPE_CAR}) as long as
     * there is a priority level at which car mode have been enabled.
     * <p>
     * Specifying a priority level when entering car mode is important in cases where multiple apps
     * on a device implement a car-mode {@link android.telecom.InCallService} (see
     * {@link android.telecom.TelecomManager#METADATA_IN_CALL_SERVICE_CAR_MODE_UI}).  The
     * {@link android.telecom.InCallService} associated with the highest priority app which entered
     * car mode will be bound to by Telecom and provided with information about ongoing calls on
     * the device.
     * <p>
     * System apps holding the required permission can enable car mode when the app determines the
     * correct conditions exist for that app to be in car mode.  The device maker should ensure that
     * where multiple apps exist on the device which can potentially enter car mode, appropriate
     * priorities are used to ensure that calls delivered by the
     * {@link android.telecom.InCallService} API are sent to the highest priority app given the
     * desired behavior of the car mode experience on the device.
     * <p>
     * If app A and app B both meet their own criteria to enable car mode, and it is desired that
     * app B should be the one which should receive call information in that scenario, the priority
     * for app B should be higher than the one for app A.  The higher priority of app B compared to
     * A means it will be bound to during calls and app A will not.  When app B no longer meets its
     * criteria for providing a car mode experience it uses {@link #disableCarMode(int)} to disable
     * car mode at its priority level.  The system will then unbind from app B and bind to app A as
     * it has the next highest priority.
     * <p>
     * When an app enables car mode at a certain priority, it can disable car mode at the specified
     * priority level using {@link #disableCarMode(int)}.  An app may only enable car mode at a
     * single priority.
     * <p>
     * Public apps are assumed to enter/exit car mode at the lowest priority,
     * {@link #DEFAULT_PRIORITY}.
     *
     * @param priority The declared priority for the caller, where {@link #DEFAULT_PRIORITY} (0) is
     *                 the lowest priority and higher numbers represent a higher priority.
     *                 The priorities apps declare when entering car mode is determined by the
     *                 device manufacturer based on the desired car mode experience.
     * @param flags Car mode flags.
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.ENTER_CAR_MODE_PRIORITIZED)
    public void enableCarMode(@IntRange(from = 0) int priority, @EnableCarMode int flags) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.enableCarMode(flags, priority,
                        mContext == null ? null : mContext.getOpPackageName());
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    /**
     * Flag for use with {@link #disableCarMode(int)}: go to the normal
     * home activity as part of the disable.  Disabling this way ensures
     * a clean transition between the current activity (in car mode) and
     * the original home activity (which was typically last running without
     * being in car mode).
     */
    public static final int DISABLE_CAR_MODE_GO_HOME = 0x0001;

    /**
     * Flag for use with {@link #disableCarMode(int)}: Disables car mode at ALL priority levels.
     * Primarily intended for use from {@link com.android.internal.app.DisableCarModeActivity} to
     * provide the user with a means to exit car mode at all priority levels.
     * @hide
     */
    public static final int DISABLE_CAR_MODE_ALL_PRIORITIES = 0x0002;

    /** @hide */
    @IntDef(prefix = { "DISABLE_CAR_MODE_" }, value = {
            DISABLE_CAR_MODE_GO_HOME
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface DisableCarMode {}

    /**
     * The default priority used for entering car mode.
     * <p>
     * Callers of the {@link #enableCarMode(int)} priority will be assigned the default priority.
     * This is considered the lowest possible priority for enabling car mode.
     * <p>
     * System apps can specify a priority other than the default priority when using
     * {@link #enableCarMode(int, int)} to enable car mode.
     * @hide
     */
    @SystemApi
    public static final int DEFAULT_PRIORITY = 0;

    /**
     * Turn off special mode if currently in car mode.
     * @param flags One of the disable car mode flags.
     */
    public void disableCarMode(@DisableCarMode int flags) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.disableCarModeByCallingPackage(flags,
                        mContext == null ? null : mContext.getOpPackageName());
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    /**
     * Return the current running mode type.  May be one of
     * {@link Configuration#UI_MODE_TYPE_NORMAL Configuration.UI_MODE_TYPE_NORMAL},
     * {@link Configuration#UI_MODE_TYPE_DESK Configuration.UI_MODE_TYPE_DESK},
     * {@link Configuration#UI_MODE_TYPE_CAR Configuration.UI_MODE_TYPE_CAR},
     * {@link Configuration#UI_MODE_TYPE_TELEVISION Configuration.UI_MODE_TYPE_TELEVISION},
     * {@link Configuration#UI_MODE_TYPE_APPLIANCE Configuration.UI_MODE_TYPE_APPLIANCE},
     * {@link Configuration#UI_MODE_TYPE_WATCH Configuration.UI_MODE_TYPE_WATCH}, or
     * {@link Configuration#UI_MODE_TYPE_VR_HEADSET Configuration.UI_MODE_TYPE_VR_HEADSET}.
     */
    public int getCurrentModeType() {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.getCurrentModeType();
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return Configuration.UI_MODE_TYPE_NORMAL;
    }

    /**
     * Sets the system-wide night mode.
     * <p>
     * The mode can be one of:
     * <ul>
     *   <li><em>{@link #MODE_NIGHT_NO}<em> sets the device into
     *       {@code notnight} mode</li>
     *   <li><em>{@link #MODE_NIGHT_YES}</em> sets the device into
     *       {@code night} mode</li>
     *   <li><em>{@link #MODE_NIGHT_CUSTOM}</em> automatically switches between
     *       {@code night} and {@code notnight} based on the custom time set (or default)</li>
     *   <li><em>{@link #MODE_NIGHT_AUTO}</em> automatically switches between
     *       {@code night} and {@code notnight} based on the device's current
     *       location and certain other sensors</li>
     * </ul>
     * <p>
     * <strong>Note:</strong> On API 22 and below, changes to the night mode
     * are only effective when the {@link Configuration#UI_MODE_TYPE_CAR car}
     * or {@link Configuration#UI_MODE_TYPE_DESK desk} mode is enabled on a
     * device. On API 23 through API 28, changes to night mode are always effective.
     * <p>
     * Starting in API 29, when the device is in car mode and this method is called, night mode
     * will change, but the new setting is not persisted and the previously persisted setting
     * will be restored when the device exits car mode.
     * <p>
     * Changes to night mode take effect globally and will result in a configuration change
     * (and potentially an Activity lifecycle event) being applied to all running apps.
     * Developers interested in an app-local implementation of night mode should consider using
     * {@link #setApplicationNightMode(int)} to set and persist the -night qualifier locally or
     * {@link androidx.appcompat.app.AppCompatDelegate#setDefaultNightMode(int)} for the
     * backward compatible implementation.
     *
     * @param mode the night mode to set
     * @see #getNightMode()
     * @see #setApplicationNightMode(int)
     */
    public void setNightMode(@NightMode int mode) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.setNightMode(mode);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    /**
     * Sets the current night mode to {@link #MODE_NIGHT_CUSTOM} with the custom night mode type
     * {@code nightModeCustomType}.
     *
     * @param nightModeCustomType
     * @throws IllegalArgumentException if passed an unsupported type to
     *         {@code nightModeCustomType}.
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.MODIFY_DAY_NIGHT_MODE)
    public void setNightModeCustomType(@NightModeCustomType int nightModeCustomType) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.setNightModeCustomType(nightModeCustomType);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    /**
     * Returns the custom night mode type.
     * <p>
     * If the current night mode is not {@link #MODE_NIGHT_CUSTOM}, returns
     * {@link #MODE_NIGHT_CUSTOM_TYPE_UNKNOWN}.
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.MODIFY_DAY_NIGHT_MODE)
    public @NightModeCustomReturnType int getNightModeCustomType() {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.getNightModeCustomType();
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return MODE_NIGHT_CUSTOM_TYPE_UNKNOWN;
    }

    /**
     * Overlays current Attention mode Night Mode overlay.
     * {@code attentionModeThemeOverlayType}.
     *
     * @throws IllegalArgumentException if passed an unsupported type to
     *                                  {@code AttentionModeThemeOverlayType}.
     * @hide
     */
    @FlaggedApi(Flags.FLAG_MODES_API)
    @RequiresPermission(android.Manifest.permission.MODIFY_DAY_NIGHT_MODE)
    public void setAttentionModeThemeOverlay(
            @AttentionModeThemeOverlayType int attentionModeThemeOverlayType) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.setAttentionModeThemeOverlay(attentionModeThemeOverlayType);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    /**
     * Returns the currently configured Attention Mode theme overlay.
     * <p>
     * May be one of:
     *   <ul>
     *     <li>{@link #MODE_ATTENTION_THEME_OVERLAY_OFF}</li>
     *     <li>{@link #MODE_ATTENTION_THEME_OVERLAY_NIGHT}</li>
     *     <li>{@link #MODE_ATTENTION_THEME_OVERLAY_DAY}</li>
     *     <li>{@link #MODE_ATTENTION_THEME_OVERLAY_UNKNOWN}</li>
     *   </ul>
     * </p>
     *
     * @hide
     */
    @FlaggedApi(Flags.FLAG_MODES_API)
    @TestApi
    @RequiresPermission(android.Manifest.permission.MODIFY_DAY_NIGHT_MODE)
    public @AttentionModeThemeOverlayReturnType int getAttentionModeThemeOverlay() {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.getAttentionModeThemeOverlay();
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return MODE_ATTENTION_THEME_OVERLAY_UNKNOWN;
    }

    /**
     * Sets and persist the night mode for this application.
     * <p>
     * The mode can be one of:
     * <ul>
     *   <li><em>{@link #MODE_NIGHT_NO}<em> sets the device into
     *       {@code notnight} mode</li>
     *   <li><em>{@link #MODE_NIGHT_YES}</em> sets the device into
     *       {@code night} mode</li>
     *   <li><em>{@link #MODE_NIGHT_CUSTOM}</em> automatically switches between
     *       {@code night} and {@code notnight} based on the custom time set (or default)</li>
     *   <li><em>{@link #MODE_NIGHT_AUTO}</em> automatically switches between
     *       {@code night} and {@code notnight} based on the device's current
     *       location and certain other sensors</li>
     * </ul>
     * <p>
     * Changes to night mode take effect locally and will result in a configuration change
     * (and potentially an Activity lifecycle event) being applied to this application. The mode
     * is persisted for this application until it is either modified by the application, the
     * user clears the data for the application, or this application is uninstalled.
     * <p>
     * Developers interested in a non-persistent app-local implementation of night mode should
     * consider using {@link androidx.appcompat.app.AppCompatDelegate#setDefaultNightMode(int)}
     * to manage the -night qualifier locally.
     *
     * @param mode the night mode to set
     * @see #setNightMode(int)
     */
    public void setApplicationNightMode(@NightMode int mode) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.setApplicationNightMode(mode);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    private Integer getNightModeFromServer() {
        try {
            if (sGlobals != null) {
                return sGlobals.mService.getNightMode();
            }
            return -1;
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }


    /**
     * Retrieve the night mode for the user.
     */
    private final IpcDataCache.QueryHandler<Void, Integer> mNightModeQuery =
            new IpcDataCache.QueryHandler<>() {

                @Override
                @NonNull
                public Integer apply(Void query) {
                    return getNightModeFromServer();
                }
            };

    private static final String NIGHT_MODE_API = "getNightMode";

    /**
     * Cache the night mode for a user.
     */
    private final IpcDataCache<Void, Integer> mNightModeCache =
            new IpcDataCache<>(1, IpcDataCache.MODULE_SYSTEM,
                    NIGHT_MODE_API, /* cacheName= */ "NightModeCache", mNightModeQuery);

    /**
     * Invalidate the night mode cache.
     *
     * @hide
     */
    @FlaggedApi(Flags.FLAG_ENABLE_NIGHT_MODE_BINDER_CACHE)
    public static void invalidateNightModeCache() {
        IpcDataCache.invalidateCache(IpcDataCache.MODULE_SYSTEM,
                NIGHT_MODE_API);
    }

    /**
     * Returns the currently configured night mode.
     * <p>
     * May be one of:
     * <ul>
     *   <li>{@link #MODE_NIGHT_NO}</li>
     *   <li>{@link #MODE_NIGHT_YES}</li>
     *   <li>{@link #MODE_NIGHT_AUTO}</li>
     *   <li>{@link #MODE_NIGHT_CUSTOM}</li>
     *   <li>{@code -1} on error</li>
     * </ul>
     *
     * @return the current night mode, or {@code -1} on error
     * @see #setNightMode(int)
     */
    public @NightMode int getNightMode() {
        if (enableNightModeBinderCache()) {
            return mNightModeCache.query(null);
        } else {
            return getNightModeFromServer();
        }
    }

    /**
     * @return If UI mode is locked or not. When UI mode is locked, calls to change UI mode
     *         like {@link #enableCarMode(int)} will silently fail.
     * @hide
     */
    @TestApi
    public boolean isUiModeLocked() {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.isUiModeLocked();
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return true;
    }

    /**
     * Returns whether night mode is locked or not.
     * <p>
     * When night mode is locked, only privileged system components may change
     * night mode and calls from non-privileged applications to change night
     * mode will fail silently.
     *
     * @return {@code true} if night mode is locked or {@code false} otherwise
     * @hide
     */
    @TestApi
    public boolean isNightModeLocked() {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.isNightModeLocked();
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return true;
    }

    /**
     * [De]activating night mode for the current user if the current night mode is custom and the
     * custom type matches {@code nightModeCustomType}.
     *
     * @param nightModeCustomType the specify type of custom mode
     * @param active {@code true} to activate night mode. Otherwise, deactivate night mode
     * @return {@code true} if night mode has successfully activated for the requested
     *         {@code nightModeCustomType}.
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.MODIFY_DAY_NIGHT_MODE)
    public boolean setNightModeActivatedForCustomMode(@NightModeCustomType int nightModeCustomType,
            boolean active) {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.setNightModeActivatedForCustomMode(
                        nightModeCustomType, active);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return false;
    }

    /**
     * Activating night mode for the current user
     *
     * @return {@code true} if the change is successful
     * @hide
     */
    @RequiresPermission(android.Manifest.permission.MODIFY_DAY_NIGHT_MODE)
    public boolean setNightModeActivated(boolean active) {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.setNightModeActivated(active);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return false;
    }

    /**
     * Returns the time of the day Dark theme activates
     * <p>
     * When night mode is {@link #MODE_NIGHT_CUSTOM}, the system uses
     * this time set to activate it automatically.
     */
    @NonNull
    public LocalTime getCustomNightModeStart() {
        if (sGlobals != null) {
            try {
                return LocalTime.ofNanoOfDay(sGlobals.mService.getCustomNightModeStart() * 1000);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return LocalTime.MIDNIGHT;
    }

    /**
     * Sets the time of the day Dark theme activates
     * <p>
     * When night mode is {@link #MODE_NIGHT_CUSTOM}, the system uses
     * this time set to activate it automatically
     * @param time The time of the day Dark theme should activate
     */
    public void setCustomNightModeStart(@NonNull LocalTime time) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.setCustomNightModeStart(time.toNanoOfDay() / 1000);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    /**
     * Returns the time of the day Dark theme deactivates
     * <p>
     * When night mode is {@link #MODE_NIGHT_CUSTOM}, the system uses
     * this time set to deactivate it automatically.
     */
    @NonNull
    public LocalTime getCustomNightModeEnd() {
        if (sGlobals != null) {
            try {
                return LocalTime.ofNanoOfDay(sGlobals.mService.getCustomNightModeEnd() * 1000);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return LocalTime.MIDNIGHT;
    }

    /**
     * Sets the time of the day Dark theme deactivates
     * <p>
     * When night mode is {@link #MODE_NIGHT_CUSTOM}, the system uses
     * this time set to deactivate it automatically.
     * @param time The time of the day Dark theme should deactivate
     */
    public void setCustomNightModeEnd(@NonNull LocalTime time) {
        if (sGlobals != null) {
            try {
                sGlobals.mService.setCustomNightModeEnd(time.toNanoOfDay() / 1000);
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
    }

    /**
     * Indicates no projection type. Can be used to compare with the {@link ProjectionType} in
     * {@link OnProjectionStateChangedListener#onProjectionStateChanged(int, Set)}.
     *
     * @hide
     */
    @SystemApi
    @TestApi
    public static final int PROJECTION_TYPE_NONE = 0x0000;
    /**
     * Automotive projection prevents degradation of GPS to save battery, routes incoming calls to
     * the automotive role holder, etc. For use with {@link #requestProjection(int)} and
     * {@link #clearProjectionState(int)}.
     *
     * @hide
     */
    @SystemApi
    @TestApi
    public static final int PROJECTION_TYPE_AUTOMOTIVE = 0x0001;
    /**
     * Indicates all projection types. For use with
     * {@link #addOnProjectionStateChangedListener(int, Executor, OnProjectionStateChangedListener)}
     * and {@link #getProjectingPackages(int)}.
     *
     * @hide
     */
    @SystemApi
    @TestApi
    public static final int PROJECTION_TYPE_ALL = -1;  // All bits on

    /** @hide */
    @IntDef(prefix = {"PROJECTION_TYPE_"}, value = {
            PROJECTION_TYPE_NONE,
            PROJECTION_TYPE_AUTOMOTIVE,
            PROJECTION_TYPE_ALL,
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface ProjectionType {
    }

    /**
     * Sets the given {@link ProjectionType}.
     *
     * Caller must have {@link android.Manifest.permission.TOGGLE_AUTOMOTIVE_PROJECTION} if
     * argument is {@link #PROJECTION_TYPE_AUTOMOTIVE}.
     * @param projectionType the type of projection to request. This must be a single
     * {@link ProjectionType} and cannot be a bitmask.
     * @return true if the projection was successfully set
     * @throws IllegalArgumentException if passed {@link #PROJECTION_TYPE_NONE},
     * {@link #PROJECTION_TYPE_ALL}, or any combination of more than one {@link ProjectionType}.
     *
     * @hide
     */
    @SystemApi
    @TestApi
    @RequiresPermission(value = android.Manifest.permission.TOGGLE_AUTOMOTIVE_PROJECTION,
            conditional = true)
    public boolean requestProjection(@ProjectionType int projectionType) {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.requestProjection(new Binder(), projectionType,
                        mContext.getOpPackageName());
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return false;
    }

    /**
     * Releases the given {@link ProjectionType}.
     *
     * Caller must have {@link android.Manifest.permission.TOGGLE_AUTOMOTIVE_PROJECTION} if
     * argument is {@link #PROJECTION_TYPE_AUTOMOTIVE}.
     * @param projectionType the type of projection to release. This must be a single
     * {@link ProjectionType} and cannot be a bitmask.
     * @return true if the package had set projection and it was successfully released
     * @throws IllegalArgumentException if passed {@link #PROJECTION_TYPE_NONE},
     * {@link #PROJECTION_TYPE_ALL}, or any combination of more than one {@link ProjectionType}.
     *
     * @hide
     */
    @SystemApi
    @TestApi
    @RequiresPermission(value = android.Manifest.permission.TOGGLE_AUTOMOTIVE_PROJECTION,
            conditional = true)
    public boolean releaseProjection(@ProjectionType int projectionType) {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.releaseProjection(
                        projectionType, mContext.getOpPackageName());
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return false;
    }

    /**
     * Gets the packages that are currently projecting.
     *
     * @param projectionType the {@link ProjectionType}s to consider when computing which packages
     *                       are projecting. Use {@link #PROJECTION_TYPE_ALL} to get all projecting
     *                       packages.
     *
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.READ_PROJECTION_STATE)
    @NonNull
    public Set<String> getProjectingPackages(@ProjectionType int projectionType) {
        if (sGlobals != null) {
            try {
                return new ArraySet<>(sGlobals.mService.getProjectingPackages(projectionType));
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return Set.of();
    }

    /**
     * Gets the {@link ProjectionType}s that are currently active.
     *
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.READ_PROJECTION_STATE)
    public @ProjectionType int getActiveProjectionTypes() {
        if (sGlobals != null) {
            try {
                return sGlobals.mService.getActiveProjectionTypes();
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        return PROJECTION_TYPE_NONE;
    }

    /**
     * Configures the listener to receive callbacks when the packages projecting using the given
     * {@link ProjectionType}s change.
     *
     * @param projectionType one or more {@link ProjectionType}s to listen for changes regarding
     * @param executor an {@link Executor} on which to invoke the callbacks
     * @param listener the {@link OnProjectionStateChangedListener} to add
     *
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.READ_PROJECTION_STATE)
    public void addOnProjectionStateChangedListener(@ProjectionType int projectionType,
            @NonNull @CallbackExecutor Executor executor,
            @NonNull OnProjectionStateChangedListener listener) {
        synchronized (mLock) {
            if (mProjectionStateListenerMap.containsKey(listener)) {
                Slog.i(TAG, "Attempted to add listener that was already added.");
                return;
            }
            if (sGlobals != null) {
                InnerListener innerListener = new InnerListener(executor, listener,
                        mOnProjectionStateChangedListenerResourceManager);
                try {
                    sGlobals.mService.addOnProjectionStateChangedListener(
                            innerListener, projectionType);
                    mProjectionStateListenerMap.put(listener, innerListener);
                } catch (RemoteException e) {
                    mOnProjectionStateChangedListenerResourceManager.remove(innerListener);
                    throw e.rethrowFromSystemServer();
                }
            }
        }
    }

    /**
     * Removes the listener so it stops receiving updates for all {@link ProjectionType}s.
     *
     * @param listener the {@link OnProjectionStateChangedListener} to remove
     *
     * @hide
     */
    @SystemApi
    @RequiresPermission(android.Manifest.permission.READ_PROJECTION_STATE)
    public void removeOnProjectionStateChangedListener(
            @NonNull OnProjectionStateChangedListener listener) {
        synchronized (mLock) {
            InnerListener innerListener = mProjectionStateListenerMap.get(listener);
            if (innerListener == null) {
                Slog.i(TAG, "Attempted to remove listener that was not added.");
                return;
            }
            if (sGlobals != null) {
                try {
                    sGlobals.mService.removeOnProjectionStateChangedListener(innerListener);
                } catch (RemoteException e) {
                    throw e.rethrowFromSystemServer();
                }
            }
            mProjectionStateListenerMap.remove(listener);
            mOnProjectionStateChangedListenerResourceManager.remove(innerListener);
        }
    }

    private static class InnerListener extends IOnProjectionStateChangedListener.Stub {
        private final WeakReference<OnProjectionStateChangedListenerResourceManager>
                mResourceManager;

        private InnerListener(@NonNull Executor executor,
                @NonNull OnProjectionStateChangedListener outerListener,
                @NonNull OnProjectionStateChangedListenerResourceManager resourceManager) {
            resourceManager.put(this, executor, outerListener);
            mResourceManager = new WeakReference<>(resourceManager);
        }

        @Override
        public void onProjectionStateChanged(int activeProjectionTypes,
                List<String> projectingPackages) {
            OnProjectionStateChangedListenerResourceManager resourceManager =
                    mResourceManager.get();
            if (resourceManager == null) {
                Slog.w(TAG, "Can't execute onProjectionStateChanged, resource manager is gone.");
                return;
            }

            OnProjectionStateChangedListener outerListener = resourceManager.getOuterListener(this);
            Executor executor = resourceManager.getExecutor(this);
            if (outerListener == null || executor == null) {
                Slog.w(TAG, "Can't execute onProjectionStatechanged, references are null.");
                return;
            }

            executor.execute(PooledLambda.obtainRunnable(
                    OnProjectionStateChangedListener::onProjectionStateChanged,
                    outerListener,
                    activeProjectionTypes,
                    new ArraySet<>(projectingPackages)).recycleOnUse());
        }
    }

    /**
     * Wrapper class that ensures we don't leak {@link Activity} or other large {@link Context} in
     * which this {@link UiModeManager} resides if/when it ends without unregistering associated
     * callback objects.
     */
    private static class OnProjectionStateChangedListenerResourceManager {
        private final Map<InnerListener, OnProjectionStateChangedListener> mOuterListenerMap =
                new ArrayMap<>(1);
        private final Map<InnerListener, Executor> mExecutorMap = new ArrayMap<>(1);

        void put(@NonNull InnerListener innerListener, @NonNull Executor executor,
                OnProjectionStateChangedListener outerListener) {
            mOuterListenerMap.put(innerListener, outerListener);
            mExecutorMap.put(innerListener, executor);
        }

        void remove(InnerListener innerListener) {
            mOuterListenerMap.remove(innerListener);
            mExecutorMap.remove(innerListener);
        }

        OnProjectionStateChangedListener getOuterListener(@NonNull InnerListener innerListener) {
            return mOuterListenerMap.get(innerListener);
        }

        Executor getExecutor(@NonNull InnerListener innerListener) {
            return mExecutorMap.get(innerListener);
        }
    }

    /**
     * Returns the color contrast for the user.
     * <p>
     * <strong>Note:</strong> You need to query this only if your application is
     * doing its own rendering and does not rely on the material rendering pipeline.
     * </p>
     * @return The color contrast, float in [-1, 1] where
     * <ul>
     *     <li> &nbsp; 0 corresponds to the default contrast </li>
     *     <li>       -1 corresponds to the minimum contrast </li>
     *     <li> &nbsp; 1 corresponds to the maximum contrast </li>
     * </ul>
     */
    @FloatRange(from = -1.0f, to = 1.0f)
    public float getContrast() {
        return sGlobals.getContrast();
    }

    /**
     * Registers a {@link ContrastChangeListener} for the current user.
     *
     * @param executor The executor on which the listener should be called back.
     * @param listener The listener.
     */
    public void addContrastChangeListener(
            @NonNull @CallbackExecutor Executor executor,
            @NonNull ContrastChangeListener listener) {
        Objects.requireNonNull(executor);
        Objects.requireNonNull(listener);
        sGlobals.addContrastChangeListener(listener, executor);
    }

    /**
     * Unregisters a {@link ContrastChangeListener} for the current user.
     * If the listener was not registered, does nothing and returns.
     *
     * @param listener The listener to unregister.
     */
    public void removeContrastChangeListener(@NonNull ContrastChangeListener listener) {
        Objects.requireNonNull(listener);
        sGlobals.removeContrastChangeListener(listener);
    }
}