Fix the section below "Pair new device" moves up a few pixels

This CL add new controller that used to show the summary when
bluetooth is off. It can prevent a jank since the UI is decided
before render.

Bug: 182232469
Test: make RunSettingsRoboTests -j56
Change-Id: I78eb757cd1b636fbb18028fb2294861467bc6eba

src/com/android/settings/connecteddevice/AddDeviceSummaryPreferenceController.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2021 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.connecteddevice;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+
+/**
+ * Controller to maintain the {@link androidx.preference.Preference} for add
+ * device with summary at beginning. It monitor Bluetooth's status(on/off) and decide if need
+ * to show summary or not.
+ */
+public class AddDeviceSummaryPreferenceController extends AddDevicePreferenceController {
+
+    public AddDeviceSummaryPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)
+                && !isBluetoothEnabled()
+                ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+}