Add multi-user support for kids mode

Listener to ACTION_USER_SWITCH intent and update the settings key when
user switched.

Bug: 231575466
Test: 1. set different settings keys for different user.
      2. switch between users and see if the setting value is correct.
Change-Id: Ia1afcb6121b296b293bef0ba7d0a0be25b857554

core/java/com/android/internal/policy/ForceShowNavBarSettingsObserver.java

@@ -16,13 +16,18 @@
 
 package com.android.internal.policy;
 
+import android.annotation.NonNull;
+import android.app.ActivityManager;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.database.ContentObserver;
+import android.net.Uri;
 import android.os.Handler;
 import android.os.UserHandle;
 import android.provider.Settings;
 
+import java.util.Collection;
+
 /**
  * A ContentObserver for listening {@link Settings.Secure#NAV_BAR_FORCE_VISIBLE} setting key.
  *
@@ -59,7 +64,11 @@ public class ForceShowNavBarSettingsObserver extends ContentObserver {
     }
 
     @Override
-    public void onChange(boolean selfChange) {
+    public void onChange(boolean selfChange, @NonNull Collection<Uri> uris, int flags, int userId) {
+        if (userId != ActivityManager.getCurrentUser()) {
+            return;
+        }
+
         if (mOnChangeRunnable != null) {
             mOnChangeRunnable.run();
         }

libs/WindowManager/Shell/src/com/android/wm/shell/kidsmode/KidsModeSettingsObserver.java

@@ -16,13 +16,18 @@
 
 package com.android.wm.shell.kidsmode;
 
+import android.annotation.NonNull;
+import android.app.ActivityManager;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.database.ContentObserver;
+import android.net.Uri;
 import android.os.Handler;
 import android.os.UserHandle;
 import android.provider.Settings;
 
+import java.util.Collection;
+
 /**
  * A ContentObserver for listening kids mode relative setting keys:
  *  - {@link Settings.Secure#NAVIGATION_MODE}
@@ -64,7 +69,11 @@ public class KidsModeSettingsObserver extends ContentObserver {
     }
 
     @Override
-    public void onChange(boolean selfChange) {
+    public void onChange(boolean selfChange, @NonNull Collection<Uri> uris, int flags, int userId) {
+        if (userId != ActivityManager.getCurrentUser()) {
+            return;
+        }
+
         if (mOnChangeRunnable != null) {
             mOnChangeRunnable.run();
         }

libs/WindowManager/Shell/src/com/android/wm/shell/kidsmode/KidsModeTaskOrganizer.java

@@ -23,7 +23,10 @@ import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
 import static android.view.Display.DEFAULT_DISPLAY;
 
 import android.app.ActivityManager;
+import android.content.BroadcastReceiver;
 import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.res.Configuration;
 import android.graphics.Rect;
 import android.os.Binder;
@@ -87,6 +90,13 @@ public class KidsModeTaskOrganizer extends ShellTaskOrganizer {
     private KidsModeSettingsObserver mKidsModeSettingsObserver;
     private boolean mEnabled;
 
+    private final BroadcastReceiver mUserSwitchIntentReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            updateKidsModeState();
+        }
+    };
+
     DisplayController.OnDisplaysChangedListener mOnDisplaysChangedListener =
             new DisplayController.OnDisplaysChangedListener() {
         @Override
@@ -169,12 +179,15 @@ public class KidsModeTaskOrganizer extends ShellTaskOrganizer {
     public void initialize(StartingWindowController startingWindowController) {
         initStartingWindow(startingWindowController);
         if (mKidsModeSettingsObserver == null) {
-            mKidsModeSettingsObserver = new KidsModeSettingsObserver(
-                    mMainHandler, mContext);
+            mKidsModeSettingsObserver = new KidsModeSettingsObserver(mMainHandler, mContext);
         }
         mKidsModeSettingsObserver.setOnChangeRunnable(() -> updateKidsModeState());
         updateKidsModeState();
         mKidsModeSettingsObserver.register();
+
+        final IntentFilter filter = new IntentFilter();
+        filter.addAction(Intent.ACTION_USER_SWITCHED);
+        mContext.registerReceiverForAllUsers(mUserSwitchIntentReceiver, filter, null, mMainHandler);
     }
 
     @Override

services/core/java/com/android/server/wm/DisplayPolicy.java

@@ -651,17 +651,19 @@ public class DisplayPolicy {
 
         mForceShowNavBarSettingsObserver = new ForceShowNavBarSettingsObserver(
                 mHandler, mContext);
-        mForceShowNavBarSettingsObserver.setOnChangeRunnable(() -> {
-            synchronized (mLock) {
-                mForceShowNavigationBarEnabled =
-                        mForceShowNavBarSettingsObserver.isEnabled();
-                updateSystemBarAttributes();
-            }
-        });
+        mForceShowNavBarSettingsObserver.setOnChangeRunnable(this::updateForceShowNavBarSettings);
         mForceShowNavigationBarEnabled = mForceShowNavBarSettingsObserver.isEnabled();
         mHandler.post(mForceShowNavBarSettingsObserver::register);
     }
 
+    private void updateForceShowNavBarSettings() {
+        synchronized (mLock) {
+            mForceShowNavigationBarEnabled =
+                    mForceShowNavBarSettingsObserver.isEnabled();
+            updateSystemBarAttributes();
+        }
+    }
+
     /**
      * Returns the first non-null alt bar window matching the given position.
      */
@@ -1801,6 +1803,7 @@ public class DisplayPolicy {
      */
     public void switchUser() {
         updateCurrentUserResources();
+        updateForceShowNavBarSettings();
     }
 
     /**