Bluetooth: Add hidden API to get current user of HID Device (1/3)

Bug: 69136526
Test: test with apps using HID Device profile
Change-Id: If0e49840257c877c975c2da176a08e613668cbc3

core/java/android/bluetooth/BluetoothHidDevice.java

@@ -700,6 +700,28 @@ public final class BluetoothHidDevice implements BluetoothProfile {
         return result;
     }
 
+    /**
+     * Gets the application name of the current HidDeviceService user.
+     *
+     * @return the current user name, or empty string if cannot get the name
+     * {@hide}
+     */
+    public String getUserAppName() {
+        final IBluetoothHidDevice service = mService;
+
+        if (service != null) {
+            try {
+                return service.getUserAppName();
+            } catch (RemoteException e) {
+                Log.e(TAG, e.toString());
+            }
+        } else {
+            Log.w(TAG, "Proxy not attached to service");
+        }
+
+        return "";
+    }
+
     /**
      * Initiates connection to host which is currently paired with this device. If the application
      * is not registered, #connect(BluetoothDevice) will fail. The connection state should be