A CollapsingToolbarLayout that exposes private properties (ExpandedMargin so far)

CustomCollapseToolbarLayout

package org.fpezzato;

import android.content.Context;
import android.support.design.widget.CollapsingToolbarLayout;
import android.util.AttributeSet;

import com.google.common.base.Throwables;

import java.lang.reflect.Field;

/**
 * Created by Francesco Pezzato on 25/06/2015.
 * 
 * Experimental code - do *not* use in production! (or at your own risk - field reflection involved :/)
 */
public class CustomCollapseToolbarLayout extends CollapsingToolbarLayout {

	private Field mExpandedMarginLeft;
	private Field mExpandedMarginTop;
	private Field mExpandedMarginRight;
	private Field mExpandedMarginBottom;

	public CustomCollapseToolbarLayout(Context context) {
		super(context);
	}

	public CustomCollapseToolbarLayout(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public CustomCollapseToolbarLayout(Context context, AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);
	}

	{
		try {
		  
			mExpandedMarginLeft = this.getClass().getSuperclass().getDeclaredField("mExpandedMarginLeft");
			mExpandedMarginLeft.setAccessible(true);
			mExpandedMarginTop = this.getClass().getSuperclass().getDeclaredField("mExpandedMarginTop");
			mExpandedMarginTop.setAccessible(true);
			mExpandedMarginRight = this.getClass().getSuperclass().getDeclaredField("mExpandedMarginRight");
			mExpandedMarginRight.setAccessible(true);
			mExpandedMarginBottom = this.getClass().getSuperclass().getDeclaredField("mExpandedMarginBottom");
			mExpandedMarginBottom.setAccessible(true);

		} catch (NoSuchFieldException e) {
			throw Throwables.propagate(e);
		}
	}

	public void setExpandedMarginLeft(int expandedMarginLeft) {
		try {
			mExpandedMarginLeft.setInt(this, expandedMarginLeft);
		} catch (IllegalAccessException e) {
			throw Throwables.propagate(e);
		}
	}

	public void setExpandedMarginTop(int expandedMarginTop) {
		try {
			mExpandedMarginTop.setInt(this, expandedMarginTop);
		} catch (IllegalAccessException e) {
			throw Throwables.propagate(e);
		}
	}

	public void setExpandedMarginRight(int expandedMarginRight) {
		try {
			mExpandedMarginRight.setInt(this, expandedMarginRight);
		} catch (IllegalAccessException e) {
			throw Throwables.propagate(e);
		}
	}

	public void setExpandedMarginBottom(int expandedMarginBottom) {
		try {
			mExpandedMarginBottom.setInt(this, expandedMarginBottom);
		} catch (IllegalAccessException e) {
			throw Throwables.propagate(e);
		}
	}
}