private void requestDelayedAutoFocus() {
    // Wait 350 ms before focusing to avoid interfering with quick button presses when
    // the user just wants to take a picture without focusing.
    cameraManager.requestAutoFocus(350L);
  }
Requests autofocus after a 350 ms delay. This delay prevents requesting focus when the user 
just wants to click the shutter button without focusing. Quick button press/release will 
trigger onShutterButtonClick() before the focus kicks in.
OCRTest/src/main/java/edu/sfsu/cs/orange/ocr/CaptureActivity.java