Create data store for supervision safe sites preference.

Test: atest SupervisionWebContentFiltersScreenTest
Test: atest SupervisionSafeSitesPreferenceTest
Test: deployed locally to a physical device
Flag: android.app.supervision.flags.enable_web_content_filters_screen
Bug: 401568468
Change-Id: I7fe8a9c5932b4c8f63c4067ba6914eb73d0e2373

src/com/android/settings/supervision/SupervisionSafeSitesDataStore.kt

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2025 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 com.android.settings.supervision
+
+import android.content.Context
+import android.provider.Settings.Secure.BROWSER_CONTENT_FILTERS_ENABLED
+import com.android.settingslib.datastore.AbstractKeyedDataObservable
+import com.android.settingslib.datastore.HandlerExecutor
+import com.android.settingslib.datastore.KeyValueStore
+import com.android.settingslib.datastore.KeyedObserver
+import com.android.settingslib.datastore.SettingsSecureStore
+import com.android.settingslib.datastore.SettingsStore
+
+/** Datastore of the safe sites preference. */
+@Suppress("UNCHECKED_CAST")
+class SupervisionSafeSitesDataStore(
+    private val context: Context,
+    private val settingsStore: SettingsStore = SettingsSecureStore.get(context),
+) : AbstractKeyedDataObservable<String>(), KeyedObserver<String>, KeyValueStore {
+
+    override fun contains(key: String) =
+        key == SupervisionBlockExplicitSitesPreference.KEY ||
+            key == SupervisionAllowAllSitesPreference.KEY
+
+    override fun <T : Any> getValue(key: String, valueType: Class<T>): T? {
+        val settingValue = (settingsStore.getBoolean(BROWSER_CONTENT_FILTERS_ENABLED) == true)
+        return when (key) {
+            SupervisionAllowAllSitesPreference.KEY -> !settingValue
+
+            SupervisionBlockExplicitSitesPreference.KEY -> settingValue
+
+            else -> null
+        }
+            as T?
+    }
+
+    override fun <T : Any> setValue(key: String, valueType: Class<T>, value: T?) {
+        if (value !is Boolean) return
+        when (key) {
+            SupervisionAllowAllSitesPreference.KEY ->
+                settingsStore.setBoolean(BROWSER_CONTENT_FILTERS_ENABLED, !value)
+
+            SupervisionBlockExplicitSitesPreference.KEY ->
+                settingsStore.setBoolean(BROWSER_CONTENT_FILTERS_ENABLED, value)
+        }
+    }
+
+    override fun onFirstObserverAdded() {
+        // observe the underlying storage key
+        settingsStore.addObserver(BROWSER_CONTENT_FILTERS_ENABLED, this, HandlerExecutor.main)
+    }
+
+    override fun onKeyChanged(key: String, reason: Int) {
+        // forward data change to preference hierarchy key
+        notifyChange(SupervisionBlockExplicitSitesPreference.KEY, reason)
+        notifyChange(SupervisionAllowAllSitesPreference.KEY, reason)
+    }
+
+    override fun onLastObserverRemoved() {
+        settingsStore.removeObserver(BROWSER_CONTENT_FILTERS_ENABLED, this)
+    }
+}

src/com/android/settings/supervision/SupervisionSafeSitesPreference.kt

@@ -18,9 +18,7 @@ package com.android.settings.supervision
 import android.content.Context
 import androidx.preference.Preference
 import com.android.settings.R
-import com.android.settingslib.datastore.KeyValueStore
 import com.android.settingslib.datastore.Permissions
-import com.android.settingslib.datastore.SettingsSecureStore
 import com.android.settingslib.metadata.BooleanValuePreference
 import com.android.settingslib.metadata.PreferenceMetadata
 import com.android.settingslib.metadata.ReadWritePermit
@@ -30,9 +28,10 @@ import com.android.settingslib.preference.forEachRecursively
 import com.android.settingslib.widget.SelectorWithWidgetPreference
 
 /** Base class of web content filters Safe sites preferences. */
-sealed class SupervisionSafeSitesPreference :
-    BooleanValuePreference, SelectorWithWidgetPreference.OnClickListener, PreferenceBinding {
-    override fun storage(context: Context): KeyValueStore = SettingsSecureStore.get(context)
+sealed class SupervisionSafeSitesPreference(
+    protected val dataStore: SupervisionSafeSitesDataStore
+) : BooleanValuePreference, SelectorWithWidgetPreference.OnClickListener, PreferenceBinding {
+    override fun storage(context: Context) = dataStore
 
     override fun getReadPermissions(context: Context) = Permissions.EMPTY
 
@@ -64,15 +63,15 @@ sealed class SupervisionSafeSitesPreference :
     override fun bind(preference: Preference, metadata: PreferenceMetadata) {
         super.bind(preference, metadata)
         (preference as SelectorWithWidgetPreference).also {
-            // TODO(b/401568468): Set the isChecked value using stored values.
-            it.isChecked = (it.key == SupervisionAllowAllSitesPreference.KEY)
+            it.isChecked = (dataStore.getBoolean(it.key) == true)
             it.setOnClickListener(this)
         }
     }
 }
 
 /** The "Try to block explicit sites" preference. */
-class SupervisionBlockExplicitSitesPreference : SupervisionSafeSitesPreference() {
+class SupervisionBlockExplicitSitesPreference(dataStore: SupervisionSafeSitesDataStore) :
+    SupervisionSafeSitesPreference(dataStore) {
 
     override val key
         get() = KEY
@@ -89,7 +88,8 @@ class SupervisionBlockExplicitSitesPreference : SupervisionSafeSitesPreference()
 }
 
 /** The "Allow all sites" preference. */
-class SupervisionAllowAllSitesPreference : SupervisionSafeSitesPreference() {
+class SupervisionAllowAllSitesPreference(dataStore: SupervisionSafeSitesDataStore) :
+    SupervisionSafeSitesPreference(dataStore) {
 
     override val key
         get() = KEY

src/com/android/settings/supervision/SupervisionWebContentFiltersScreen.kt

@@ -47,8 +47,9 @@ class SupervisionWebContentFiltersScreen : PreferenceScreenCreator {
                 R.string.supervision_web_content_filters_browser_title,
             ) +=
                 {
-                    +SupervisionBlockExplicitSitesPreference()
-                    +SupervisionAllowAllSitesPreference()
+                    val dataStore = SupervisionSafeSitesDataStore(context)
+                    +SupervisionBlockExplicitSitesPreference(dataStore)
+                    +SupervisionAllowAllSitesPreference(dataStore)
                 }
             // TODO(b/401569571) implement the SafeSearch group.
         }