Report folding features to letterboxed apps.

import android.app.ActivityThread;

import android.app.Application;

import android.content.Context;

import android.window.TaskFragmentOrganizer;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

                    Context context = getApplication();

                    DeviceStateManagerFoldingFeatureProducer producer =

                            getFoldingFeatureProducer();

                    // TODO(b/263263909) Use the organizer to tell if an Activity is embededed.

                    // Need to improve our Dependency Injection and centralize the logic.

                    TaskFragmentOrganizer organizer = new TaskFragmentOrganizer(command -> {

                        throw new RuntimeException("Not allowed!");

                    });

                    mWindowLayoutComponent = new WindowLayoutComponentImpl(context, organizer,

                            producer);

                    mWindowLayoutComponent = new WindowLayoutComponentImpl(context, producer);

                }

            }

        }

package androidx.window.extensions.layout;

import static android.view.Display.DEFAULT_DISPLAY;

import static androidx.window.common.CommonFoldingFeature.COMMON_STATE_FLAT;

import static androidx.window.common.CommonFoldingFeature.COMMON_STATE_HALF_OPENED;

import static androidx.window.util.ExtensionHelper.isZero;

import static androidx.window.util.ExtensionHelper.transformToWindowSpaceRect;

import android.app.Activity;

import android.app.ActivityClient;

import android.app.Application;

import android.app.WindowConfiguration;

import android.content.ComponentCallbacks;

import android.os.Bundle;

import android.os.IBinder;

import android.util.ArrayMap;

import android.view.WindowManager;

import android.window.TaskFragmentOrganizer;

import androidx.annotation.GuardedBy;

import androidx.annotation.NonNull;

import java.util.Collections;

import java.util.List;

import java.util.Map;

import java.util.Objects;

import java.util.Set;

/**

    private final Map<java.util.function.Consumer<WindowLayoutInfo>, Consumer<WindowLayoutInfo>>

            mJavaToExtConsumers = new ArrayMap<>();

    private final TaskFragmentOrganizer mTaskFragmentOrganizer;

    public WindowLayoutComponentImpl(@NonNull Context context,

            @NonNull TaskFragmentOrganizer taskFragmentOrganizer,

            @NonNull DeviceStateManagerFoldingFeatureProducer foldingFeatureProducer) {

        ((Application) context.getApplicationContext())

                .registerActivityLifecycleCallbacks(new NotifyOnConfigurationChanged());

        mFoldingFeatureProducer = foldingFeatureProducer;

        mFoldingFeatureProducer.addDataChangedCallback(this::onDisplayFeaturesChanged);

        mTaskFragmentOrganizer = taskFragmentOrganizer;

    }

    /**

            // Display features are not supported on secondary displays.

            return false;

        }

        final int windowingMode;

        IBinder activityToken = context.getActivityToken();

        if (activityToken != null) {

            final Configuration taskConfig = ActivityClient.getInstance().getTaskConfiguration(

                    activityToken);

            if (taskConfig == null) {

                // If we cannot determine the task configuration for any reason, it is likely that

                // we won't be able to determine its position correctly as well. DisplayFeatures'

                // bounds in this case can't be computed correctly, so we should skip.

                return false;

            }

            final Rect taskBounds = taskConfig.windowConfiguration.getBounds();

            final WindowManager windowManager = Objects.requireNonNull(

                    context.getSystemService(WindowManager.class));

            final Rect maxBounds = windowManager.getMaximumWindowMetrics().getBounds();

            boolean isTaskExpanded = maxBounds.equals(taskBounds);

            /*

             * We need to proxy being in full screen because when a user enters PiP and exits PiP

             * the task windowingMode will report multi-window/pinned until the transition is

             * finished in WM Shell.

             * maxBounds == taskWindowBounds is a proxy check to verify the window is full screen

             */

            return isTaskExpanded;

        } else {

            // TODO(b/242674941): use task windowing mode for window context that associates with

            //  activity.

            windowingMode = context.getResources().getConfiguration().windowConfiguration

                    .getWindowingMode();

        }

        // It is recommended not to report any display features in multi-window mode, since it

        // won't be possible to synchronize the display feature positions with window movement.

        return !WindowConfiguration.inMultiWindowMode(windowingMode);

        // We do not report folding features for Activities in PiP because the bounds are

        // not updated fast enough and the window is too small for the UI to adapt.

        return context.getResources().getConfiguration().windowConfiguration

                .getWindowingMode() != WindowConfiguration.WINDOWING_MODE_PINNED;

    }

    @GuardedBy("mLock")