title: NFC unavailable when camera is open
body: <p>This is my Torch app:</p>
  
  <pre><code>final Camera.Parameters p;
  Camera camera=Camera.open();
  
  camera.setPreviewTexture(new SurfaceTexture(0));
  p = camera.getParameters();
  
  p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
  camera.setParameters(p);
  camera.startPreview();
  </code></pre>
  
  <p>When my app is running, some devices cannot detect NFC tags.  I noticed this happens with the Nexus 5X, specifically.</p>
  
  <p>It appears certain devices can't detect NFC when the camera is running.</p>
  
  <p>Can this problem be solved programmatically?</p>