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# Conflicts: # indicatorseekbar/src/main/java/com/warkiz/widget/IndicatorSeekBar.java
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indicatorseekbar/src/main/java/com/warkiz/widget/FormatUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package com.warkiz.widget; | ||
|
|
||
| import java.math.BigDecimal; | ||
| import java.math.RoundingMode; | ||
| import java.util.Arrays; | ||
|
|
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| /** | ||
| * by zhyhang | ||
| * from https://blog.csdn.net/zhyhang/article/details/17973049 | ||
| */ | ||
| class FormatUtils { | ||
|
|
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| private final static char[][] LEADING_DECIMALS = new char[][]{ | ||
| "0.".toCharArray(), "0.0".toCharArray(), | ||
| "0.00".toCharArray(), "0.000".toCharArray(), "0.0000".toCharArray(), | ||
| "0.00000".toCharArray(), | ||
| "0.000000".toCharArray(), "0.0000000".toCharArray(), "0.00000000".toCharArray(), | ||
| "0.000000000".toCharArray(), "0.0000000000".toCharArray(), "0.00000000000".toCharArray(), | ||
| "0.000000000000".toCharArray(), "0.0000000000000".toCharArray(), | ||
| "0.00000000000000".toCharArray(), | ||
| "0.000000000000000".toCharArray() | ||
| }; | ||
|
|
||
| /** | ||
| * 快速格式化一个double，尾零去除（非对齐）<br> | ||
| * 等同于:<br> | ||
| * NumberFormat f = NumberFormat.getNumberInstance();<br> | ||
| * f.setGroupingUsed(false);<br> | ||
| * f.setMaximumFractionDigits(precision);<br> | ||
| * f.format(d);<br> | ||
| * 但一般情况效率高于NumberFormat一倍，且精度无丢失。<br> | ||
| * | ||
| * @param d the double value | ||
| * @param precision [0,16] | ||
| */ | ||
| static String fastFormat(double d, int precision) { | ||
| int posPrecision = Math.abs(precision); | ||
| double roundUpVal = Math.abs(d) * Math.pow(10d, posPrecision) + 0.5d; | ||
| if (roundUpVal > 999999999999999d || posPrecision > 16) {// double has max 16 precisions | ||
| return bigDecFormat(d, posPrecision); | ||
| } | ||
| long longPart = (long) Math.nextUp(roundUpVal); | ||
| if (longPart < 1) { | ||
| return "0"; | ||
| } | ||
| char[] longPartChars = Long.toString(longPart).toCharArray(); | ||
| char[] formatChars; | ||
| if (longPartChars.length > posPrecision) { | ||
| int end = longPartChars.length - 1; | ||
| int decIndex = longPartChars.length - posPrecision; | ||
| while (end >= decIndex && longPartChars[end] == '0') { | ||
| end--; | ||
| } | ||
| if (end >= decIndex) { | ||
| formatChars = new char[end + 2]; | ||
| System.arraycopy(longPartChars, 0, formatChars, 0, decIndex); | ||
| formatChars[decIndex] = '.'; | ||
| System.arraycopy(longPartChars, decIndex, formatChars, | ||
| decIndex + 1, end - decIndex + 1); | ||
| } else { | ||
| formatChars = new char[decIndex]; | ||
| System.arraycopy(longPartChars, 0, formatChars, 0, decIndex); | ||
| } | ||
| } else { | ||
| int end = longPartChars.length - 1; | ||
| while (end >= 0 && longPartChars[end] == '0') { | ||
| end--; | ||
| } | ||
| char[] leadings = LEADING_DECIMALS[posPrecision - longPartChars.length]; | ||
| formatChars = Arrays.copyOf(leadings, leadings.length + end + 1); | ||
| System.arraycopy(longPartChars, 0, formatChars, leadings.length, end + 1); | ||
| } | ||
| return Math.signum(d) > 0 ? new String(formatChars) : "-" + new String(formatChars); | ||
| } | ||
|
|
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| private static String bigDecFormat(double d, int precision) { | ||
| String formatStr = new BigDecimal(Double.toString(d)).setScale(Math.abs(precision), RoundingMode.HALF_UP) | ||
| .toString(); | ||
| if (precision == 0) { | ||
| return formatStr; | ||
| } | ||
| int end = formatStr.length() - 1; | ||
| while (end >= 0 && formatStr.charAt(end) == '0') { | ||
| end--; | ||
| } | ||
| formatStr = formatStr.substring(0, end + 1); | ||
| if (formatStr.charAt(formatStr.length() - 1) == '.') { | ||
| formatStr = formatStr.substring(0, formatStr.length() - 1); | ||
| } | ||
| return formatStr; | ||
| } | ||
|
|
||
| } |
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