Improve the latency of NotificationChannelSlice

Get the notification data in parallel to reduce the latency.

Fixes: 123065955
Test: visual, robotests

Change-Id: I434ec68197af214f540ba39ae9155ee7625a2742

src/com/android/settings/homepage/contextualcards/slices/NotificationMultiChannelAppRow.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2019 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.homepage.contextualcards.slices;
+
+import android.content.Context;
+import android.content.pm.PackageInfo;
+
+import com.android.settings.notification.NotificationBackend;
+
+import java.util.concurrent.Callable;
+
+/**
+ * This class is responsible for getting notification app row from package which has multiple
+ * notification channels.{@link NotificationChannelSlice} uses it to improve latency.
+ */
+class NotificationMultiChannelAppRow implements Callable<NotificationBackend.AppRow> {
+
+    private final Context mContext;
+    private final NotificationBackend mNotificationBackend;
+    private final PackageInfo mPackageInfo;
+
+    public NotificationMultiChannelAppRow(Context context, NotificationBackend notificationBackend,
+            PackageInfo packageInfo) {
+        mContext = context;
+        mNotificationBackend = notificationBackend;
+        mPackageInfo = packageInfo;
+    }
+
+    @Override
+    public NotificationBackend.AppRow call() throws Exception {
+        final int channelCount = mNotificationBackend.getChannelCount(
+                mPackageInfo.applicationInfo.packageName, mPackageInfo.applicationInfo.uid);
+        if (channelCount > 1) {
+            return mNotificationBackend.loadAppRow(mContext, mContext.getPackageManager(),
+                    mPackageInfo);
+        }
+        return null;
+    }
+}