Introduce a progessBar for multiple devices

And a progessBar for multiple devices dialog
only. The progessBar will disapear after the
first device is found.

Test: atest CtsCompanionDeviceManagerCoreTestCases
      atest CtsCompanionDeviceManagerUiAutomationTestCases
      atest CtsOsTestCases:CompanionDeviceManagerTest

Bug: 211722613
Change-Id: Id79820099837fae7dc273ce038f772910258fa07

packages/CompanionDeviceManager/res/layout/activity_confirmation.xml

@@ -84,6 +84,16 @@
             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

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.
-    private View mProgressIndicator;
+    // multiple device association.
+    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(
-                /* lifecycleOwner */ this,
-                /* observer */ mDeviceAdapter);
+        CompanionDeviceDiscoveryService.getScanResult().observe(this,
+                deviceFilterPairs -> {
+                    // 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) {

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
-        Observer<List<DeviceFilterPair<?>>> {
+class DeviceListAdapter extends RecyclerView.Adapter<DeviceListAdapter.ViewHolder> {
     public int mSelectedPosition = RecyclerView.NO_POSITION;
 
     private final Context mContext;
@@ -96,9 +94,8 @@ class DeviceListAdapter extends RecyclerView.Adapter<DeviceListAdapter.ViewHolde
         mSelectedPosition = position;
     }
 
-    @Override
-    public void onChanged(List<DeviceFilterPair<?>> deviceFilterPairs) {
-        mDevices = deviceFilterPairs;
+    void setDevices(List<DeviceFilterPair<?>> devices) {
+        mDevices = devices;
         notifyDataSetChanged();
     }