Migrate Data Saver

Add the skeleton of the Data Saver

Bug: 368359883
Test: atest DataSaverScreenTest
Flag: com.android.settings.flags.catalyst_restrict_background_parent_entry
Change-Id: I008c1ff7a1ad4ff1eeb95be730680abe5666f26c

src/com/android/settings/datausage/DataSaverScreen.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2024 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.datausage
+
+import android.content.Context
+import com.android.settings.R
+import com.android.settings.flags.Flags
+import com.android.settingslib.metadata.ProvidePreferenceScreen
+import com.android.settingslib.metadata.preferenceHierarchy
+import com.android.settingslib.preference.PreferenceScreenCreator
+
+@ProvidePreferenceScreen
+class DataSaverScreen : PreferenceScreenCreator {
+    override val key
+        get() = KEY
+
+    override val title
+        get() = R.string.data_saver_title
+
+    override val icon: Int
+        get() = R.drawable.ic_settings_data_usage
+
+    override fun order(context: Context) = 10
+
+    override fun isFlagEnabled(context: Context) = Flags.catalystRestrictBackgroundParentEntry()
+
+    override fun fragmentClass() = DataSaverSummary::class.java
+
+    override fun getPreferenceHierarchy(context: Context) = preferenceHierarchy(this) {}
+
+    override fun hasCompleteHierarchy() = false
+
+    companion object {
+        const val KEY = "restrict_background_parent_entry"
+    }
+}

src/com/android/settings/datausage/DataSaverSummary.kt

@@ -79,6 +79,8 @@ class DataSaverSummary : DashboardFragment() {
     override fun getHelpResource() = R.string.help_url_data_saver
     override fun getLogTag() = TAG
 
+    override fun getPreferenceScreenBindingKey(context: Context) = DataSaverScreen.KEY
+
     private val dataSaverBackendListener = object : DataSaverBackend.Listener {
         override fun onDataSaverChanged(isDataSaving: Boolean) {
             synchronized(this) {