MarginProxy.java

import android.view.View;
import android.view.ViewGroup.MarginLayoutParams;

/**
 * Allows an ObjectAnimator to set/get margins of a view
 * how to use:
 * MarginProxy marginProxy = new MarginProxy(noteContainer);
 * ObjectAnimator marginAnimation = ObjectAnimator.ofInt(marginProxy, "topMargin", oldTopMargin, newTopMargin).setDuration(300);
 */
public class MarginProxy {
	private View mView;

	public MarginProxy(View view) {
		mView = view;
	}

	public int getLeftMargin() {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		return lp.leftMargin;
	}

	public void setLeftMargin(int margin) {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		lp.setMargins(margin, lp.topMargin, lp.rightMargin, lp.bottomMargin);
		mView.requestLayout();
	}

	public int getTopMargin() {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		return lp.topMargin;
	}

	public void setTopMargin(int margin) {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		lp.setMargins(lp.leftMargin, margin, lp.rightMargin, lp.bottomMargin);
		mView.requestLayout();
	}

	public int getRightMargin() {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		return lp.rightMargin;
	}

	public void setRightMargin(int margin) {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		lp.setMargins(lp.leftMargin, lp.topMargin, margin, lp.bottomMargin);
		mView.requestLayout();
	}

	public int getBottomMargin() {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		return lp.bottomMargin;
	}

	public void setBottomMargin(int margin) {
		MarginLayoutParams lp = (MarginLayoutParams) mView.getLayoutParams();
		lp.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, margin);
		mView.requestLayout();
	}
}