Update conversation launch point

Test: make -j64 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.notification"
Fixes: 156670585
Change-Id: I31f306d1b7d480ac0ef0cc4a5f7e66efe528383d

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

@@ -0,0 +1,52 @@
+/*
+ * 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;
+
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+public class ConversationListSummaryPreferenceController extends BasePreferenceController {
+
+    private NotificationBackend mBackend;
+
+    public ConversationListSummaryPreferenceController(Context context, String key) {
+        super(context, key);
+        mBackend = new NotificationBackend();
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        final int count = mBackend.getConversations(true).getList().size();
+        if (count == 0) {
+            return mContext.getText(R.string.priority_conversation_count_zero);
+        }
+        return mContext.getResources().getQuantityString(
+                R.plurals.priority_conversation_count,
+                count, count);
+    }
+
+    void setBackend(NotificationBackend backend) {
+        mBackend = backend;
+    }
+}