Add accessibility delegate and populate itemCount

Change made to fix accessibility issue for talkback to announce correct
number in the list numbers as suggeste in b/333672369#comment4

Bug: 333672369
Test: Manual
Change-Id: I7f4ed0b39a40040c1185809e0b348d12e1eabf29

src/com/android/settings/privatespace/HidePrivateSpaceSettings.java

@@ -18,6 +18,15 @@ package com.android.settings.privatespace;
 
 import android.app.settings.SettingsEnums;
 import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.accessibility.AccessibilityNodeInfo;
+
+import androidx.annotation.NonNull;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.PreferenceScreen;
 
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
@@ -25,6 +34,7 @@ import com.android.settingslib.widget.IllustrationPreference;
 
 public class HidePrivateSpaceSettings extends DashboardFragment {
     private static final String TAG = "HidePrivateSpaceSettings";
+    private static final int IMPORTANT_FOR_ACCESSIBILITY_ITEM_COUNT = 5;
     private static final String PRIVATE_SPACE_HIDE_ILLUSTRATION_KEY =
             "private_space_hide_illustration";
 
@@ -36,6 +46,34 @@ public class HidePrivateSpaceSettings extends DashboardFragment {
         }
     }
 
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        View root = super.onCreateView(inflater, container, savedInstanceState);
+        PreferenceScreen preferenceScreen = getPreferenceScreen();
+        final int itemCount =  countPreferencesRecursive(preferenceScreen);
+        root.setAccessibilityDelegate(
+                new View.AccessibilityDelegate() {
+                    @Override
+                    public void onInitializeAccessibilityNodeInfo(
+                            @NonNull View host, @NonNull AccessibilityNodeInfo info) {
+                        super.onInitializeAccessibilityNodeInfo(host, info);
+                        //TODO(b/346712220)  - Replace the hardcoded accessibility count with
+                        //value computed from xml Preference
+                        info.setCollectionInfo(
+                                new AccessibilityNodeInfo.CollectionInfo.Builder()
+                                        .setRowCount(itemCount)
+                                        .setColumnCount(1)
+                                        .setItemCount(itemCount)
+                                        .setImportantForAccessibilityItemCount(
+                                                IMPORTANT_FOR_ACCESSIBILITY_ITEM_COUNT)
+                                        .build()
+                        );
+                    }
+                });
+        return  root;
+    }
+
     @Override
     public void onStart() {
         super.onStart();
@@ -66,4 +104,15 @@ public class HidePrivateSpaceSettings extends DashboardFragment {
     protected String getLogTag() {
         return TAG;
     }
+
+    private int countPreferencesRecursive(PreferenceGroup preferenceGroup) {
+        int count = preferenceGroup.getPreferenceCount();
+        for (int i = 0; i < preferenceGroup.getPreferenceCount(); i++) {
+            Preference preference = preferenceGroup.getPreference(i);
+            if (preference instanceof PreferenceGroup) {
+                count += countPreferencesRecursive((PreferenceGroup) preference);
+            }
+        }
+        return count;
+    }
 }