Update top of modes page

* Show blurb based on mode type.
* Make the icon bigger and highlight it when mode is active.
* Increase spacing between elements.

Also eliminate some code duplication between header of mode page and header of icon picker.

Fixes: 355415875
Test: manual
Flag: android.app.modes_ui
Change-Id: I7e788b9b5920cedb791d1571b19b37e65ece6d0b

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

@@ -0,0 +1,60 @@
+/*
+ * 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 static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.TypedValue;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.preference.PreferenceViewHolder;
+
+import com.android.settings.R;
+import com.android.settingslib.widget.TopIntroPreference;
+
+public class ZenModeBlurbPreference extends TopIntroPreference {
+
+    public ZenModeBlurbPreference(Context context) {
+        super(context);
+    }
+
+    public ZenModeBlurbPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        if (holder.findViewById(android.R.id.title) instanceof TextView textView) {
+            textView.setTextSize(TypedValue.COMPLEX_UNIT_PX,
+                    getContext().getResources().getDimensionPixelSize(
+                            R.dimen.zen_mode_blurb_text_size));
+
+            textView.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
+
+            ViewGroup.LayoutParams layoutParams = textView.getLayoutParams();
+            if (layoutParams.width != MATCH_PARENT) {
+                layoutParams.width = MATCH_PARENT;
+                textView.setLayoutParams(layoutParams);
+            }
+        }
+    }
+}