Notify UI update when get onAudioModeChanged() callback

- Update test case

Bug: 132385707
Test: make -j42 RunSettingsLibRoboTests

Change-Id: I96043e2cf5411745483db00bb2bba982e68558ce

packages/SettingsLib/src/com/android/settingslib/media/BluetoothMediaManager.java

@@ -197,6 +197,11 @@ public class BluetoothMediaManager extends MediaManager implements BluetoothCall
         }
     }
 
+    @Override
+    public void onAudioModeChanged() {
+        dispatchDataChanged();
+    }
+
     @Override
     public void onDeviceAdded(CachedBluetoothDevice cachedDevice) {
         if (isCachedDeviceConnected(cachedDevice)) {

packages/SettingsLib/tests/robotests/src/com/android/settingslib/media/BluetoothMediaManagerTest.java

@@ -455,4 +455,12 @@ public class BluetoothMediaManagerTest {
 
         verify(mCallback).onConnectedDeviceChanged(PhoneMediaDevice.ID);
     }
+
+    @Test
+    public void onAudioModeChanged_shouldCallOnDeviceAttributesChanged() {
+        mMediaManager.registerCallback(mCallback);
+        mMediaManager.onAudioModeChanged();
+
+        verify(mCallback).onDeviceAttributesChanged();
+    }
 }