DO NOT MERGE Listen for config changes when updating features.

Listen for configuration changes to push out folding feature changes.
Fixes a bug where the reference implementation would not emit the
correct folding feature if a configuration changed. The effect was that
you would see the folding feature for portait while in landscape or
vice-versa.

Maintains parity with Sidecar providing updates for Activities that do
not handle configuration changes.

Bug: 205342008, 206697963
Test: Manual - Open the sample app and use the application that &&
  handles configuration changes.  &&
  Expect the folding feature to match the physical orientation
Test: Manual - open an app that handles PiP and folding features &&
  Flattend the device and put app into PiP &&
  Fold device and put PiP app in full screen. &&
  Expect the app to react to fold.
Test: atest CtsWindowManagerJetpackTestCases
Change-Id: I726827c9f1482ddd0b55a6839e34660deb340767

libs/WindowManager/Jetpack/src/androidx/window/extensions/layout/WindowLayoutComponentImpl.java

@@ -25,13 +25,17 @@ import static androidx.window.util.ExtensionHelper.transformToWindowSpaceRect;
 
 import android.annotation.Nullable;
 import android.app.Activity;
+import android.app.Application;
 import android.content.Context;
 import android.graphics.Rect;
+import android.os.Bundle;
+import android.os.IBinder;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.window.common.CommonFoldingFeature;
 import androidx.window.common.DeviceStateManagerFoldingFeatureProducer;
+import androidx.window.common.EmptyLifecycleCallbacksAdapter;
 import androidx.window.common.SettingsDisplayFeatureProducer;
 import androidx.window.util.DataProducer;
 import androidx.window.util.PriorityDataProducer;
@@ -62,6 +66,8 @@ public class WindowLayoutComponentImpl implements WindowLayoutComponent {
     private final DataProducer<List<CommonFoldingFeature>> mFoldingFeatureProducer;
 
     public WindowLayoutComponentImpl(Context context) {
+        ((Application) context.getApplicationContext())
+                .registerActivityLifecycleCallbacks(new NotifyOnConfigurationChanged());
         mSettingsDisplayFeatureProducer = new SettingsDisplayFeatureProducer(context);
         mFoldingFeatureProducer = new PriorityDataProducer<>(List.of(
                 mSettingsDisplayFeatureProducer,
@@ -72,6 +78,7 @@ public class WindowLayoutComponentImpl implements WindowLayoutComponent {
 
     /**
      * Adds a listener interested in receiving updates to {@link WindowLayoutInfo}
+     *
      * @param activity hosting a {@link android.view.Window}
      * @param consumer interested in receiving updates to {@link WindowLayoutInfo}
      */
@@ -83,6 +90,7 @@ public class WindowLayoutComponentImpl implements WindowLayoutComponent {
 
     /**
      * Removes a listener no longer interested in receiving updates.
+     *
      * @param consumer no longer interested in receiving updates to {@link WindowLayoutInfo}
      */
     public void removeWindowLayoutInfoListener(
@@ -104,6 +112,16 @@ public class WindowLayoutComponentImpl implements WindowLayoutComponent {
         return mWindowLayoutChangeListeners.keySet();
     }
 
+    @NonNull
+    private Boolean isListeningForLayoutChanges(IBinder token) {
+        for (Activity activity: getActivitiesListeningForLayoutChanges()) {
+            if (token.equals(activity.getWindow().getAttributes().token)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     protected boolean hasListeners() {
         return !mWindowLayoutChangeListeners.isEmpty();
     }
@@ -115,9 +133,9 @@ public class WindowLayoutComponentImpl implements WindowLayoutComponent {
      * possible to translate, then we will return a {@code null} value.
      *
      * @param state if it matches a value in {@link CommonFoldingFeature.State}, {@code null}
-     * otherwise. @return a {@link FoldingFeature.STATE_FLAT} or
+     *              otherwise. @return a {@link FoldingFeature.STATE_FLAT} or
-     * {@link FoldingFeature.STATE_HALF_OPENED} if the given state matches a value in
+     *              {@link FoldingFeature.STATE_HALF_OPENED} if the given state matches a value in
-     * {@link CommonFoldingFeature.State} and {@code null} otherwise.
+     *              {@link CommonFoldingFeature.State} and {@code null} otherwise.
      */
     @Nullable
     private Integer convertToExtensionState(int state) {
@@ -198,7 +216,27 @@ public class WindowLayoutComponentImpl implements WindowLayoutComponent {
         } else {
             mSettingsDisplayFeatureProducer.unregisterObserversIfNeeded();
         }
-
         onDisplayFeaturesChanged();
     }
+
+    private final class NotifyOnConfigurationChanged extends EmptyLifecycleCallbacksAdapter {
+        @Override
+        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
+            super.onActivityCreated(activity, savedInstanceState);
+            onDisplayFeaturesChangedIfListening(activity);
+        }
+
+        @Override
+        public void onActivityConfigurationChanged(Activity activity) {
+            super.onActivityConfigurationChanged(activity);
+            onDisplayFeaturesChangedIfListening(activity);
+        }
+
+        private void onDisplayFeaturesChangedIfListening(Activity activity) {
+            IBinder token = activity.getWindow().getAttributes().token;
+            if (token == null || isListeningForLayoutChanges(token)) {
+                onDisplayFeaturesChanged();
+            }
+        }
+    }
 }

libs/WindowManager/Jetpack/src/androidx/window/sidecar/SampleSidecarImpl.java

@@ -23,14 +23,17 @@ import static androidx.window.util.ExtensionHelper.transformToWindowSpaceRect;
 
 import android.app.Activity;
 import android.app.ActivityThread;
+import android.app.Application;
 import android.content.Context;
 import android.graphics.Rect;
+import android.os.Bundle;
 import android.os.IBinder;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.window.common.CommonFoldingFeature;
 import androidx.window.common.DeviceStateManagerFoldingFeatureProducer;
+import androidx.window.common.EmptyLifecycleCallbacksAdapter;
 import androidx.window.common.SettingsDisplayFeatureProducer;
 import androidx.window.util.DataProducer;
 import androidx.window.util.PriorityDataProducer;
@@ -52,6 +55,8 @@ class SampleSidecarImpl extends StubSidecar {
     private final SettingsDisplayFeatureProducer mSettingsFoldingFeatureProducer;
 
     SampleSidecarImpl(Context context) {
+        ((Application) context.getApplicationContext())
+                .registerActivityLifecycleCallbacks(new NotifyOnConfigurationChanged());
         mSettingsFoldingFeatureProducer = new SettingsDisplayFeatureProducer(context);
         mFoldingFeatureProducer = new PriorityDataProducer<>(List.of(
                 mSettingsFoldingFeatureProducer,
@@ -138,8 +143,30 @@ class SampleSidecarImpl extends StubSidecar {
     protected void onListenersChanged() {
         if (hasListeners()) {
             mSettingsFoldingFeatureProducer.registerObserversIfNeeded();
+            onDisplayFeaturesChanged();
         } else {
             mSettingsFoldingFeatureProducer.unregisterObserversIfNeeded();
         }
     }
+
+    private final class NotifyOnConfigurationChanged extends EmptyLifecycleCallbacksAdapter {
+        @Override
+        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
+            super.onActivityCreated(activity, savedInstanceState);
+            onDisplayFeaturesChangedForActivity(activity);
+        }
+
+        @Override
+        public void onActivityConfigurationChanged(Activity activity) {
+            super.onActivityConfigurationChanged(activity);
+            onDisplayFeaturesChangedForActivity(activity);
+        }
+
+        private void onDisplayFeaturesChangedForActivity(@NonNull Activity activity) {
+            IBinder token = activity.getWindow().getAttributes().token;
+            if (token == null || mWindowLayoutChangeListenerTokens.contains(token)) {
+                onDisplayFeaturesChanged();
+            }
+        }
+    }
 }

libs/WindowManager/Jetpack/src/androidx/window/sidecar/StubSidecar.java

@@ -30,7 +30,7 @@ import java.util.Set;
 abstract class StubSidecar implements SidecarInterface {
 
     private SidecarCallback mSidecarCallback;
-    private final Set<IBinder> mWindowLayoutChangeListenerTokens = new HashSet<>();
+    final Set<IBinder> mWindowLayoutChangeListenerTokens = new HashSet<>();
     private boolean mDeviceStateChangeListenerRegistered;
 
     StubSidecar() {