moneytoo

	public Bitmap invert(Bitmap src)
	{ 
		int height = src.getHeight();
		int width = src.getWidth();    

		Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap);
		Paint paint = new Paint();
		
		ColorMatrix matrixGrayscale = new ColorMatrix();

JakeWharton

import android.text.SpannableStringBuilder;
import java.util.ArrayDeque;
import java.util.Deque;

import static android.text.Spanned.SPAN_INCLUSIVE_EXCLUSIVE;

/** A {@link SpannableStringBuilder} wrapper whose API doesn't make me want to stab my eyes out. */
public class Truss {
  private final SpannableStringBuilder builder;
  private final Deque<Span> stack;