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package com.github.mikephil.charting.utils; //from ww w . j a va2s . c o m import java.text.DecimalFormat; /** * Predefined value-formatter that formats large numbers in a pretty way. * Outputs: 856 = 856; 1000 = 1k; 5821 = 5.8k; 10500 = 10k; 101800 = 102k; * 2000000 = 2m; 7800000 = 7.8m; 92150000 = 92m; 123200000 = 123m; 9999999 = * 10m; 1000000000 = 1b; Special thanks to Roman Gromov * (https://github.com/romangromov) for this piece of code. * * @author Philipp Jahoda */ public class LargeValueFormatter implements ValueFormatter { private static String[] SUFFIX = new String[] { "", "k", "m", "b", "t" }; private static int MAX_LENGTH = 4; private DecimalFormat mFormat; public LargeValueFormatter() { mFormat = new DecimalFormat("###E0"); } @Override public String getFormattedValue(float value) { return makePretty(value); } /** * Formats each number properly. Special thanks to Roman Gromov * (https://github.com/romangromov) for this piece of code. */ private String makePretty(double number) { String r = mFormat.format(number); r = r.replaceAll("E[0-9]", SUFFIX[Character.getNumericValue(r.charAt(r.length() - 1)) / 3]); while (r.length() > MAX_LENGTH || r.matches("[0-9]+\\.[a-z]")) { r = r.substring(0, r.length() - 2) + r.substring(r.length() - 1); } return r; } }