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/AddDevicePreferenceController.java

@@ -33,7 +33,8 @@ import com.android.settingslib.core.lifecycle.events.OnStop;
 
 /**
  * Controller to maintain the {@link androidx.preference.Preference} for add
- * device. It monitor Bluetooth's status(on/off) and decide if need to show summary or not.
+ * device without summary at beginning. It monitor Bluetooth's status(on/off) and decide if need
+ * to show summary or not.
  */
 public class AddDevicePreferenceController extends BasePreferenceController
         implements LifecycleObserver, OnStart, OnStop {
@@ -46,7 +47,8 @@ public class AddDevicePreferenceController extends BasePreferenceController
         }
     };
     private IntentFilter mIntentFilter;
-    private BluetoothAdapter mBluetoothAdapter;
+
+    protected BluetoothAdapter mBluetoothAdapter;
 
     public AddDevicePreferenceController(Context context, String key) {
         super(context, key);
@@ -57,6 +59,7 @@ public class AddDevicePreferenceController extends BasePreferenceController
     @Override
     public void onStart() {
         mContext.registerReceiver(mReceiver, mIntentFilter);
+        updateState(mPreference);
     }
 
     @Override
@@ -75,17 +78,22 @@ public class AddDevicePreferenceController extends BasePreferenceController
     @Override
     public int getAvailabilityStatus() {
         return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)
+                && isBluetoothEnabled()
                 ? AVAILABLE
                 : UNSUPPORTED_ON_DEVICE;
     }
 
     @Override
     public CharSequence getSummary() {
-        return mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()
+        return isBluetoothEnabled()
                 ? ""
                 : mContext.getString(R.string.connected_device_add_device_summary);
     }
 
+    protected boolean isBluetoothEnabled() {
+        return mBluetoothAdapter != null && mBluetoothAdapter.isEnabled();
+    }
+
     void updateState() {
         updateState(mPreference);
     }

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;
+    }
+}