Redirect to new modes page when modes_ui is on.

The new modes page has essentially no content yet, but this is a rough proof of concept for the existing abstract classes and hopefully serves as a building block for future changes. It lists modes and those preferences lead to contentless pages that will be fleshed out later..

Flag: android.app.modes_ui
Bug: 327260745
Test: ZenModePreferenceControllerTest
Test: manual; individual pages only have skeleton functionality and should be unit tested in future CLs
Change-Id: I12f48b48f761e3c9ff1a173445b15f7536d34edb

src/com/android/settings/notification/modes/ZenModeFragment.java

@@ -0,0 +1,78 @@
+/*
+ * 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.notification.modes;
+
+import android.app.AutomaticZenRule;
+import android.app.settings.SettingsEnums;
+import android.content.Context;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ZenModeFragment extends ZenModeFragmentBase {
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.modes_rule_settings;
+    }
+
+    @Override
+    protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
+        // TODO: fill in with all the elements of this page. Each should be an instance of
+        //       {@link AbstractZenModePreferenceController}.
+        List<AbstractPreferenceController> prefControllers = new ArrayList<>();
+        return prefControllers;
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+
+        // Set title for the entire screen
+        ZenMode mode = getMode();
+        AutomaticZenRule azr = getAZR();
+        if (mode == null || azr == null) {
+            return;
+        }
+        getActivity().setTitle(azr.getName());
+
+        // TODO: b/308819292 - implement the real screen!
+        final PreferenceScreen screen = getPreferenceScreen();
+        if (screen == null) {
+            return;
+        }
+
+        Preference tmpPref = screen.findPreference("zen_mode_test");
+        if (tmpPref == null) {
+            return;
+        }
+        tmpPref.setTitle(azr.getTriggerDescription());
+        tmpPref.setSummary("active?: " + mode.isActive());
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        // TODO: b/332937635 - make this the correct metrics category
+        return SettingsEnums.NOTIFICATION_ZEN_MODE_AUTOMATION;
+    }
+}