code: protected void setOffsetPixels(float offsetPixels) {
  		final int oldOffset = (int) mOffsetPixels;
  		final int newOffset = (int) offsetPixels;
  
  		mOffsetPixels = offsetPixels;
  
  		if (newOffset != oldOffset) {
  			onOffsetPixelsChanged(newOffset);
  			mSwipeBackViewVisible = newOffset != 0;
  
  			// Notify any attached listeners of the current open ratio
  			final float openRatio = ((float) Math.abs(newOffset)) / mSwipeBackViewSize;
  			dispatchOnDrawerSlide(openRatio, newOffset);
  		}
  	}
docs: Sets the number of pixels the content should be offset.
  
  @param offsetPixels The number of pixels to offset the content by.