gistfile1.java

public class HeroAnimation implements Serializable {
	private int mLeft;
	private int mTop;
	private int mWidth;
	private int mHeight;
	private float mAlpha;

	/**
	 * @param exampleView View to be animated to with Hero Animation
	 */
	public HeroAnimation(View exampleView) {
		final int[] location = new int[2];
		exampleView.getLocationOnScreen(location);

		mLeft = location[0];
		mTop = location[1];
		mWidth = exampleView.getWidth();
		mHeight = exampleView.getHeight();
		mAlpha = exampleView.getAlpha();
	}

	public AnimatorSet getAnimations(View targetView, boolean enter) {
		if (enter) {
			targetView.setPivotX(0);
			targetView.setPivotY(0);
		}

		AnimatorSet animatorSet = new AnimatorSet();

		animatorSet.playTogether(
				getPositionAnimations(targetView, enter),
				getScaleAnimations(targetView, enter),
				getAlphaAnimation(targetView, enter)
		);

		return animatorSet;
	}

	private AnimatorSet getPositionAnimations(View targetView, boolean enter) {
		int[] screenLocation = new int[2];
		targetView.getLocationOnScreen(screenLocation);

		int leftDelta = mLeft - screenLocation[0];
		int topDelta = mTop - screenLocation[1];

		float[] xValues = new float[] { leftDelta, 0 };
		float[] yValues = new float[] { topDelta, 0 };

		if (!enter) {
			xValues = new float[] { leftDelta };
			yValues = new float[] { topDelta };
		}

		AnimatorSet animatorSet = new AnimatorSet();

		animatorSet.playTogether(
				ObjectAnimator.ofFloat(targetView, "translationX", xValues),
				ObjectAnimator.ofFloat(targetView, "translationY", yValues)
		);

		return animatorSet;
	}

	private AnimatorSet getScaleAnimations(View targetView, boolean enter) {
		float widthScale = (float)mWidth / targetView.getWidth();
		float heightScale = (float)mHeight / targetView.getHeight();

		float[] xValues = new float[] { widthScale, 1 };
		float[] yValues = new float[] { heightScale, 1 };

		if (!enter) {
			xValues = new float[] { widthScale };
			yValues = new float[] { heightScale };
		}

		AnimatorSet animatorSet = new AnimatorSet();

		animatorSet.playTogether(
				ObjectAnimator.ofFloat(targetView, "scaleX", xValues),
				ObjectAnimator.ofFloat(targetView, "scaleY", yValues)
		);

		return animatorSet;
	}

	private Animator getAlphaAnimation(View targetView, boolean enter) {
		float[] values = new float[] { mAlpha, targetView.getAlpha() };

		if (!enter)
			values = new float[] { mAlpha };

		return ObjectAnimator.ofFloat(targetView, "alpha", values);
	}
}