Merge changes from topics "presubmit-am-1a8adc3a42824e489007f2ef846a0f71", "presubmit-am-71bbe918d83d491e8ccb96c26458149c", "presubmit-am-e80e22a9aeb8442eb3b3332c3b2ea804" into tm-dev

* changes:
  CDM UI cleanUp
  Introduce a progessBar for multiple devices
  Make the Allow button at the top

packages/CompanionDeviceManager/res/color/selector.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/drawable/btn_negative_multiple_devices.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/drawable/btn_negative_top.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~
@@ -17,6 +18,6 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
     <solid android:color="@android:color/system_accent1_100"/>
-    <corners android:topLeftRadius="12dp" android:topRightRadius="12dp"
+    <corners android:topLeftRadius="4dp" android:topRightRadius="4dp"
-             android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp"/>
+             android:bottomLeftRadius="12dp" android:bottomRightRadius="12dp"/>
 </shape>

packages/CompanionDeviceManager/res/drawable/btn_positive_bottom.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~
@@ -17,6 +18,6 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
     <solid android:color="@android:color/system_accent1_100"/>
-    <corners android:topLeftRadius="4dp" android:topRightRadius="4dp"
+    <corners android:topLeftRadius="12dp" android:topRightRadius="12dp"
-             android:bottomLeftRadius="12dp" android:bottomRightRadius="12dp"/>
+             android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp"/>
 </shape>

packages/CompanionDeviceManager/res/drawable/helper_ok_button.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/drawable/ic_apps.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/drawable/ic_device_other.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/drawable/ic_notifications.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/drawable/ic_storage.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/drawable/ic_watch.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~

packages/CompanionDeviceManager/res/layout/activity_confirmation.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- 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
@@ -20,35 +19,26 @@
     <!-- A header for selfManaged devices only. -->
     <include layout="@layout/vendor_header" />
 
+    <!-- Do NOT change the ID of the root LinearLayout above: it's referenced in CTS tests. -->
+
     <ImageView
         android:id="@+id/profile_icon"
         android:layout_width="match_parent"
         android:layout_height="32dp"
         android:gravity="center"
-        android:layout_marginBottom="12dp"
+        android:layout_marginTop="18dp"
-        android:layout_marginTop="1dp"
         android:tint="@android:color/system_accent1_600"/>
 
-    <!-- Do NOT change the ID of the root LinearLayout above: it's referenced in CTS tests. -->
+    <LinearLayout style="@style/Description">
+        <TextView
+            android:id="@+id/title"
+            style="@style/DescriptionTitle" />
 
-    <TextView
+        <TextView
-        android:id="@+id/title"
+            android:id="@+id/summary"
-        android:layout_width="match_parent"
+            style="@style/DescriptionSummary" />
-        android:layout_height="wrap_content"
-        android:gravity="center"
-        android:paddingHorizontal="12dp"
-        android:layout_marginBottom="12dp"
-        style="@*android:style/TextAppearance.Widget.Toolbar.Title" />
 
-    <TextView
+    </LinearLayout>
-        android:id="@+id/summary"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="12dp"
-        android:layout_marginBottom="12dp"
-        android:gravity="center"
-        android:textColor="?android:attr/textColorSecondary"
-        android:textSize="14sp" />
 
     <RelativeLayout
         android:layout_width="match_parent"
@@ -59,18 +49,20 @@
             android:id="@+id/multiple_device_list"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:layout_marginBottom="12dp"
             android:orientation="vertical"
             android:visibility="gone">
 
             <View
                 android:id="@+id/border_top"
-                android:layout_marginTop="12dp"
                 style="@style/DeviceListBorder" />
 
             <androidx.recyclerview.widget.RecyclerView
                 android:id="@+id/device_list"
                 android:layout_width="match_parent"
                 android:scrollbars="vertical"
+                android:layout_marginBottom="12dp"
                 android:layout_height="200dp" />
 
             <View
@@ -84,35 +76,56 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content" />
 
+        <ProgressBar
+            android:id="@+id/spinner"
+            android:layout_width="56dp"
+            android:layout_height="56dp"
+            android:layout_centerInParent="true"
+            android:indeterminate="true"
+            android:tint="@android:color/system_accent1_600"
+            android:visibility="gone"
+            style="?android:attr/progressBarStyleLarge" />
+
     </RelativeLayout>
 
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:gravity="center"
         android:orientation="vertical"
-        android:layout_marginTop="24dp">
+        android:layout_marginTop="16dp">
 
         <!-- Do NOT change the IDs of the buttons: they are referenced in CTS tests. -->
 
-        <Button
-            android:id="@+id/btn_negative"
-            style="@style/NegativeButton"
-            android:text="@string/consent_no" />
-
         <Button
             android:id="@+id/btn_positive"
             style="@style/PositiveButton"
             android:text="@string/consent_yes" />
 
         <Button
-            android:id="@+id/btn_negative_multiple_devices"
+            android:id="@+id/btn_negative"
-            android:layout_marginLeft="170dp"
+            android:layout_marginBottom="12dp"
-            android:layout_marginBottom="10dp"
+            style="@style/NegativeButton"
-            style="@style/NegativeButtonMultipleDevices"
-            android:textColor = "?android:textColorPrimary"
-            android:visibility="gone"
             android:text="@string/consent_no" />
 
     </LinearLayout>
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="bottom|right"
+        android:orientation="vertical"
+        android:layout_marginRight="16dp"
+        android:layout_marginBottom="16dp">
+
+        <!-- Do NOT change the IDs of the buttons: they are referenced in CTS tests. -->
+
+        <Button
+            android:id="@+id/btn_negative_multiple_devices"
+            style="@style/NegativeButtonMultipleDevices"
+            android:textColor="?android:textColorPrimary"
+            android:visibility="gone"
+            android:text="@string/consent_no" />
+    </LinearLayout>
+
 </LinearLayout>

packages/CompanionDeviceManager/res/layout/data_transfer_confirmation.xml

@@ -15,54 +15,42 @@
   ~ limitations under the License.
   -->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-              android:id="@+id/activity_confirmation"
+              android:id="@+id/data_transfer_confirmation"
-              android:layout_width="match_parent"
+              style="@style/ContainerLayout">
-              android:layout_height="wrap_content"
-              android:background="@drawable/dialog_background"
-              android:elevation="16dp"
-              android:maxHeight="400dp"
-              android:orientation="vertical"
-              android:padding="18dp"
-              android:layout_gravity="center">
 
     <!-- Do NOT change the ID of the root LinearLayout above: it's referenced in CTS tests. -->
 
-    <TextView
+    <LinearLayout style="@style/Description">
-        android:id="@+id/title"
+        <TextView
-        android:layout_width="match_parent"
+            android:id="@+id/title"
-        android:layout_height="wrap_content"
+            style="@style/DescriptionTitle" />
-        android:gravity="center"
-        android:paddingHorizontal="12dp"
-        style="@*android:style/TextAppearance.Widget.Toolbar.Title"/>
 
-    <TextView
+        <TextView
-        android:id="@+id/summary"
+            android:id="@+id/summary"
-        android:layout_width="match_parent"
+            style="@style/DescriptionSummary" />
-        android:layout_height="wrap_content"
+
-        android:layout_marginTop="12dp"
+    </LinearLayout>
-        android:layout_marginBottom="12dp"
-        android:gravity="center"
-        android:textColor="?android:attr/textColorSecondary"
-        android:textSize="14sp" />
 
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:gravity="center"
         android:orientation="vertical"
-        android:layout_marginTop="24dp">
+        android:layout_marginTop="16dp">
 
         <!-- Do NOT change the IDs of the buttons: they are referenced in CTS tests. -->
 
-        <Button
-            android:id="@+id/btn_negative"
-            style="@style/NegativeButton"
-            android:text="@string/consent_no" />
-
         <Button
             android:id="@+id/btn_positive"
             style="@style/PositiveButton"
             android:text="@string/consent_yes" />
 
+        <Button
+            android:id="@+id/btn_negative"
+            android:layout_marginBottom="12dp"
+            style="@style/NegativeButton"
+            android:text="@string/consent_no" />
+
     </LinearLayout>
 
 </LinearLayout>

packages/CompanionDeviceManager/res/layout/helper_confirmation.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~
@@ -17,6 +18,7 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
               android:id="@+id/helper_confirmation"
               android:theme="@style/ChooserActivity"
+              android:padding="12dp"
               style="@style/ContainerLayout">
 
     <ImageView
@@ -24,8 +26,8 @@
         android:layout_width="match_parent"
         android:layout_height="32dp"
         android:gravity="center"
-        android:layout_marginBottom="12dp"
+        android:layout_marginTop="12dp"
-        android:layout_marginTop="1dp"/>
+        android:layout_marginBottom="12dp"/>
 
     <TextView
         android:id="@+id/helper_title"
@@ -33,17 +35,18 @@
         android:layout_height="wrap_content"
         android:gravity="center"
         android:paddingHorizontal="12dp"
-        style="@*android:style/TextAppearance.Widget.Toolbar.Title"
+        android:textColor="?android:attr/textColorPrimary"
-        android:textSize="20sp" />
+        android:textSize="22sp" />
 
     <TextView
         android:id="@+id/helper_summary"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:layout_marginLeft="24dp"
+        android:layout_marginRight="24dp"
         android:layout_marginTop="12dp"
-        android:layout_marginLeft="20dp"
         android:layout_marginBottom="24dp"
-        android:gravity="start"
+        android:gravity="center"
         android:textColor="?android:attr/textColorSecondary"
         android:textSize="14sp" />
 
@@ -51,6 +54,8 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
+        android:layout_marginRight="12dp"
+        android:layout_marginBottom="12dp"
         android:gravity="end">
 
         <Button

packages/CompanionDeviceManager/res/layout/list_item_device.xml

@@ -28,6 +28,7 @@
         android:id="@android:id/icon"
         android:layout_width="24dp"
         android:layout_height="24dp"
+        android:layout_marginLeft="24dp"
         android:layout_marginRight="12dp"
         android:tint="@android:color/system_accent1_600"/>
 

packages/CompanionDeviceManager/res/layout/list_item_permission.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~
@@ -19,13 +20,15 @@
               android:layout_width="match_parent"
               android:layout_height="wrap_content"
               android:orientation="horizontal"
-              android:padding="5dp">
+              android:paddingLeft="32dp"
+              android:paddingRight="32dp"
+              android:paddingBottom="14dp">
 
     <ImageView
         android:id="@+id/permission_icon"
         android:layout_width="24dp"
         android:layout_height="24dp"
-        android:layout_marginTop="7dp"
+        android:layout_marginTop="8dp"
         android:layout_marginEnd="12dp"
         android:tint="@android:color/system_accent1_600"
         android:contentDescription="Permission Icon"/>
@@ -48,6 +51,7 @@
             android:id="@+id/permission_summary"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
+            android:paddingRight="24dp"
             android:textSize="14sp"
             android:textColor="?android:attr/textColorSecondary"/>
 

packages/CompanionDeviceManager/res/layout/vendor_header.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~
@@ -21,7 +22,10 @@
     android:layout_height="wrap_content"
     android:orientation="horizontal"
     android:layout_gravity="center"
-    android:layout_marginBottom="16dp"
+    android:paddingTop="24dp"
+    android:paddingBottom="4dp"
+    android:paddingLeft="24dp"
+    android:paddingRight="24dp"
     android:visibility="gone" >
 
     <ImageView
@@ -42,7 +46,6 @@
         style="?android:attr/actionOverflowButtonStyle"
         android:layout_width="31dp"
         android:layout_height="32dp"
-        android:layout_marginLeft="100dp"
         android:layout_alignParentRight="true" />
 
 </RelativeLayout>

packages/CompanionDeviceManager/res/values/styles.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   ~ Copyright (C) 2022 The Android Open Source Project
   ~
@@ -16,51 +17,86 @@
 
 <resources>
     <style name="ContainerLayout">
-        <item name="android:padding">18dp</item>
-        <item name="android:elevation">16dp</item>
-        <item name="android:maxHeight">400dp</item>
-        <item name="android:orientation">vertical</item>
-        <item name="android:layout_gravity">center</item>
         <item name="android:layout_width">match_parent</item>
         <item name="android:layout_height">wrap_content</item>
+        <item name="android:orientation">vertical</item>
+        <item name="android:layout_gravity">center</item>
+        <item name="android:minWidth">340dp</item>
         <item name="android:background">@drawable/dialog_background</item>
     </style>
 
+    <style name="Description">
+        <item name="android:layout_width">match_parent</item>
+        <item name="android:layout_height">wrap_content</item>
+        <item name="android:orientation">vertical</item>
+        <item name="android:layout_marginTop">18dp</item>
+        <item name="android:layout_marginBottom">18dp</item>
+        <item name="android:layout_marginLeft">24dp</item>
+        <item name="android:layout_marginRight">24dp</item>
+    </style>
+
+    <style name="DescriptionTitle"
+           parent="@*android:style/TextAppearance.Widget.Toolbar.Title">
+        <item name="android:layout_width">match_parent</item>
+        <item name="android:layout_height">wrap_content</item>
+        <item name="android:gravity">center</item>
+        <item name="android:layout_marginLeft">14dp</item>
+        <item name="android:layout_marginRight">14dp</item>
+        <item name="android:textSize">20sp</item>
+        <item name="android:textColor">?android:attr/textColorPrimary</item>
+    </style>
+
+    <style name="DescriptionSummary">
+        <item name="android:layout_width">match_parent</item>
+        <item name="android:layout_height">wrap_content</item>
+        <item name="android:gravity">center</item>
+        <item name="android:layout_marginTop">18dp</item>
+        <item name="android:layout_marginLeft">18dp</item>
+        <item name="android:layout_marginRight">18dp</item>
+        <item name="android:textSize">14sp</item>
+        <item name="android:textColor">?android:attr/textColorSecondary</item>
+    </style>
+
     <style name="VendorHelperOkButton"
            parent="@android:style/Widget.Material.Button.Borderless.Colored">
         <item name="android:layout_width">50dp</item>
-        <item name="android:layout_height">35dp</item>
+        <item name="android:layout_height">36dp</item>
         <item name="android:layout_marginTop">20dp</item>
         <item name="android:textColor">@android:color/system_neutral1_900</item>
         <item name="android:background">@drawable/helper_ok_button</item>
     </style>
 
-    <style name="NegativeButton"
+    <style name="PositiveButton"
            parent="@android:style/Widget.Material.Button.Borderless.Colored">
-        <item name="android:layout_width">match_parent</item>
+        <item name="android:layout_width">300dp</item>
-        <item name="android:layout_height">wrap_content</item>
+        <item name="android:layout_height">56dp</item>
+        <item name="android:layout_marginLeft">24dp</item>
+        <item name="android:layout_marginRight">24dp</item>
+        <item name="android:layout_marginBottom">2dp</item>
         <item name="android:textAllCaps">false</item>
         <item name="android:textSize">14sp</item>
         <item name="android:textColor">@android:color/system_neutral1_900</item>
-        <item name="android:background">@drawable/btn_negative_top</item>
+        <item name="android:background">@drawable/btn_positive_bottom</item>
     </style>
 
-    <style name="PositiveButton"
+    <style name="NegativeButton"
            parent="@android:style/Widget.Material.Button.Borderless.Colored">
-        <item name="android:layout_width">match_parent</item>
+        <item name="android:layout_width">300dp</item>
-        <item name="android:layout_height">wrap_content</item>
+        <item name="android:layout_height">56dp</item>
+        <item name="android:layout_marginLeft">24dp</item>
+        <item name="android:layout_marginRight">24dp</item>
+        <item name="android:layout_marginTop">2dp</item>
         <item name="android:textAllCaps">false</item>
         <item name="android:textSize">14sp</item>
         <item name="android:textColor">@android:color/system_neutral1_900</item>
         <item name="android:layout_marginTop">4dp</item>
-        <item name="android:background">@drawable/btn_positive_bottom</item>
+        <item name="android:background">@drawable/btn_negative_top</item>
     </style>
 
     <style name="NegativeButtonMultipleDevices"
            parent="@android:style/Widget.Material.Button.Colored">
         <item name="android:layout_width">100dp</item>
-        <item name="android:layout_height">35dp</item>
+        <item name="android:layout_height">36dp</item>
-        <item name="android:layout_marginTop">20dp</item>
         <item name="android:textAllCaps">false</item>
         <item name="android:background">@drawable/btn_negative_multiple_devices</item>
     </style>

packages/CompanionDeviceManager/src/com/android/companiondevicemanager/CompanionDeviceActivity.java

@@ -57,6 +57,7 @@ import android.widget.Button;
 import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
+import android.widget.ProgressBar;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 
@@ -116,14 +117,14 @@ public class CompanionDeviceActivity extends FragmentActivity implements
     private ImageButton mVendorHeaderButton;
 
     // Progress indicator is only shown while we are looking for the first suitable device for a
-    // "regular" (ie. not self-managed) association.
+    // multiple device association.
-    private View mProgressIndicator;
+    private ProgressBar mProgressIndicator;
 
     // Present for self-managed association requests and "single-device" regular association
     // regular.
     private Button mButtonAllow;
     private Button mButtonNotAllow;
-    // Present for multiple device association requests only.
+    // Present for multiple devices' association requests only.
     private Button mButtonNotAllowMultipleDevices;
 
     private LinearLayout mAssociationConfirmationDialog;
@@ -263,6 +264,8 @@ public class CompanionDeviceActivity extends FragmentActivity implements
         mVendorHeaderButton = findViewById(R.id.vendor_header_button);
 
         mDeviceListRecyclerView = findViewById(R.id.device_list);
+
+        mProgressIndicator = findViewById(R.id.spinner);
         mDeviceAdapter = new DeviceListAdapter(this, this::onListItemClick);
 
         mPermissionListRecyclerView = findViewById(R.id.permission_list);
@@ -502,21 +505,25 @@ public class CompanionDeviceActivity extends FragmentActivity implements
         mSummary.setText(summary);
         mProfileIcon.setImageDrawable(profileIcon);
 
-        mDeviceAdapter = new DeviceListAdapter(this, this::onListItemClick);
-
-        // TODO: hide the list and show a spinner until a first device matching device is found.
         mDeviceListRecyclerView.setAdapter(mDeviceAdapter);
         mDeviceListRecyclerView.setLayoutManager(new LinearLayoutManager(this));
 
-        CompanionDeviceDiscoveryService.getScanResult().observe(
+        CompanionDeviceDiscoveryService.getScanResult().observe(this,
-                /* lifecycleOwner */ this,
+                deviceFilterPairs -> {
-                /* observer */ mDeviceAdapter);
+                    // Dismiss the progress bar once there's one device found for multiple devices.
+                    if (deviceFilterPairs.size() >= 1) {
+                        mProgressIndicator.setVisibility(View.GONE);
+                    }
+
+                    mDeviceAdapter.setDevices(deviceFilterPairs);
+                });
 
         // "Remove" consent button: users would need to click on the list item.
         mButtonAllow.setVisibility(View.GONE);
         mButtonNotAllow.setVisibility(View.GONE);
         mButtonNotAllowMultipleDevices.setVisibility(View.VISIBLE);
         mMultipleDeviceList.setVisibility(View.VISIBLE);
+        mProgressIndicator.setVisibility(View.VISIBLE);
     }
 
     private void onListItemClick(int position) {
@@ -564,7 +571,7 @@ public class CompanionDeviceActivity extends FragmentActivity implements
                 CompanionVendorHelperDialogFragment.newInstance(mRequest.getPackageName(),
                         mRequest.getUserId(), mRequest.getDeviceProfile());
 
-        mAssociationConfirmationDialog.setVisibility(View.GONE);
+        mAssociationConfirmationDialog.setVisibility(View.INVISIBLE);
 
         fragmentDialog.show(fragmentManager, /* Tag */ FRAGMENT_DIALOG_TAG);
     }

packages/CompanionDeviceManager/src/com/android/companiondevicemanager/CompanionDeviceDiscoveryService.java

@@ -150,6 +150,8 @@ public class CompanionDeviceDiscoveryService extends Service {
         mBtAdapter = mBtManager.getAdapter();
         mBleScanner = mBtAdapter.getBluetoothLeScanner();
         mWifiManager = getSystemService(WifiManager.class);
+
+        sScanResultsLiveData.setValue(Collections.emptyList());
     }
 
     @Override
@@ -186,7 +188,6 @@ public class CompanionDeviceDiscoveryService extends Service {
         mStopAfterFirstMatch = request.isSingleDevice();
         mDiscoveryStarted = true;
         sStateLiveData.setValue(DiscoveryState.DISCOVERY_IN_PROGRESS);
-        sScanResultsLiveData.setValue(Collections.emptyList());
 
         final List<DeviceFilter<?>> allFilters = request.getDeviceFilters();
         final List<BluetoothDeviceFilter> btFilters =

packages/CompanionDeviceManager/src/com/android/companiondevicemanager/DeviceListAdapter.java

@@ -25,15 +25,13 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import androidx.lifecycle.Observer;
 import androidx.recyclerview.widget.RecyclerView;
 
 import java.util.List;
 /**
  * Adapter for the list of "found" devices.
  */
-class DeviceListAdapter extends RecyclerView.Adapter<DeviceListAdapter.ViewHolder> implements
+class DeviceListAdapter extends RecyclerView.Adapter<DeviceListAdapter.ViewHolder> {
-        Observer<List<DeviceFilterPair<?>>> {
     public int mSelectedPosition = RecyclerView.NO_POSITION;
 
     private final Context mContext;
@@ -96,9 +94,8 @@ class DeviceListAdapter extends RecyclerView.Adapter<DeviceListAdapter.ViewHolde
         mSelectedPosition = position;
     }
 
-    @Override
+    void setDevices(List<DeviceFilterPair<?>> devices) {
-    public void onChanged(List<DeviceFilterPair<?>> deviceFilterPairs) {
+        mDevices = devices;
-        mDevices = deviceFilterPairs;
         notifyDataSetChanged();
     }