Redesign individual conversation page

Test: atest
Fixes: 151765526
Change-Id: I98d45222104eb03449e469bcd80fd5f23c2935ca

src/com/android/settings/notification/app/PriorityConversationsPreferenceController.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2020 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.app;
+
+import android.content.Context;
+import android.os.AsyncTask;
+import android.service.notification.ConversationChannelWrapper;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+
+import com.android.settings.notification.NotificationBackend;
+
+import java.util.Collections;
+import java.util.List;
+
+public class PriorityConversationsPreferenceController extends
+        ConversationListPreferenceController {
+
+    private static final String KEY = "important_conversations";
+    private static final String LIST_KEY = "important_conversations_list";
+    private List<ConversationChannelWrapper> mConversations;
+
+    public PriorityConversationsPreferenceController(Context context,
+            NotificationBackend backend) {
+        super(context, backend);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        PreferenceCategory pref = (PreferenceCategory) preference;
+        // Load conversations
+        new AsyncTask<Void, Void, Void>() {
+            @Override
+            protected Void doInBackground(Void... unused) {
+                mConversations = mBackend.getConversations(true).getList();
+                Collections.sort(mConversations, mConversationComparator);
+                return null;
+            }
+
+            @Override
+            protected void onPostExecute(Void unused) {
+                if (mContext == null) {
+                    return;
+                }
+                populateList(mConversations, pref, pref.findPreference(LIST_KEY));
+            }
+        }.execute();
+
+    }
+}