Add initial settings for summarization

Test: SummarizationGlobalPreferenceControllerTest
Test: SummarizationPreferenceControllerTest
Flag: android.app.nm_summarization
Bug: 390415383
Change-Id: I773d69c707ae5f902860196fb44821ede15261f5

src/com/android/settings/notification/SummarizationGlobalPreferenceController.java

@@ -0,0 +1,62 @@
+/*
+ * 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.notification;
+
+import android.app.Flags;
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+
+import com.android.settings.widget.SettingsMainSwitchPreferenceController;
+
+public class SummarizationGlobalPreferenceController extends
+        SettingsMainSwitchPreferenceController {
+
+    NotificationBackend mBackend;
+
+    public SummarizationGlobalPreferenceController(@NonNull Context context,
+            @NonNull String preferenceKey) {
+        super(context, preferenceKey);
+        mBackend = new NotificationBackend();
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if ((Flags.nmSummarization() || Flags.nmSummarizationUi())
+                && mBackend.isNotificationSummarizationSupported()) {
+            return AVAILABLE;
+        }
+        return CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return mBackend.isNotificationSummarizationEnabled(mContext);
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        mBackend.setNotificationSummarizationEnabled(isChecked);
+        return true;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        // not needed since it's not sliceable
+        return NO_RES;
+    }
+}