Fix failing Ultra HDR sample on emulator

Author: yrezgui

samples/graphics/ultrahdr/src/main/java/com/example/platform/graphics/ultrahdr/opengl/UltraHDRWithOpenGL.kt

@@ -182,8 +182,11 @@ class UltraHDRWithOpenGL : Fragment(),
  }
 
  override fun onAttach(context: Context) {
- requireActivity().display
- ?.registerHdrSdrRatioChangedListener(Runnable::run, updateHdrSdrRatio)
+ requireActivity().display?.let { display ->
+ if (display.isHdrSdrRatioAvailable) {
+ display.registerHdrSdrRatioChangedListener(Runnable::run, updateHdrSdrRatio)
+ }
+ }
  super.onAttach(context)
  }