Android Utililty Methods Long Format

List of utility methods to do Long Format

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Description

The list of methods to do Long Format are organized into topic(s).

Method

StringtoZeroPaddedString(long value, int precision, int maxSize)
If necessary, adds zeros to the beginning of a value so that the total length matches the given precision, otherwise trims the right digits. 
StringBuffer sb = new StringBuffer();
if (value < 0) {
    value = -value;
String s = Long.toString(value);
if (s.length() > precision) {
    s = s.substring(precision);
for (int i = s.length(); i < precision; i++) {
    sb.append('0');
sb.append(s);
if (maxSize < precision) {
    sb.setLength(maxSize);
return sb.toString();
long[]splitLongs(String str)
Parse comma-separated list of longs and return as array. 
StringTokenizer tokenizer = new StringTokenizer(str, ",");
int n = tokenizer.countTokens();
long[] list = new long[n];
for (int i = 0; i < n; i++) {
    String token = tokenizer.nextToken();
    list[i] = Long.parseLong(token);
return list;
...
Stringconvert2Percent(long readsize, long totalsize)
convert Percent 
String str = "00.00%";
float result = ((float) readsize) / (float) totalsize;
System.out.println(result);
DecimalFormat df = new DecimalFormat("##.##%");
str = df.format(result);
return str;
StringformatSize(long value)
format Size 
double k = (double) value / 1024;
if (k == 0) {
    return String.format("%dB", value);
double m = k / 1024;
if (m < 1) {
    return String.format("%.1fK", k);
double g = m / 1024;
if (g < 1) {
    return String.format("%.1fM", m);
return String.format("%.1fG", g);
StringformatSpaceSize(long file_size)
format Space Size 
if (file_size < 1024) {
    return file_size + "B";
} else if (file_size < 1024 * 1024) {
    return NO_DECIMAL_POINT_DF.format((double) file_size / 1024)
            + "KB";
} else if (file_size < 1024 * 1024 * 1024) {
    return NO_DECIMAL_POINT_DF
            .format((double) file_size / 1024 / 1024) + "MB";
...
StringformatPercent(long divisor, long dividend)
format Percent 
if (dividend == 0) {
    return null;
double ret = (double) (divisor * 100) / dividend;
return String.format(Locale.CHINA, "%.2f%%", ret);
StringformatSize(long value)
format Size 
double k = (double) value / 1024;
if (k == 0) {
    return String.format(Locale.CHINA, "%d B", value);
double m = k / 1024;
if (m < 1) {
    return String.format(Locale.CHINA, "%.2f K", k);
double g = m / 1024;
if (g < 1) {
    return String.format(Locale.CHINA, "%.2f M", m);
return String.format(Locale.CHINA, "%.2f G", g);
StringgetTimeFormattedFromMillis(long millis)
Returns a formatted time string in the form of (hh:)mm:ss generated from milliseconds 
long duration = millis / 1000;
long h = duration / 3600;
long m = (duration - h * 3600) / 60;
long s = duration - (h * 3600 + m * 60);
String durationString = "";
if (h != 0) {
    durationString += StringUtil.getZeroPaddedString(h) + ":";
durationString += StringUtil.getZeroPaddedString(m) + ":";
durationString += StringUtil.getZeroPaddedString(s);
return durationString;
StringformatFileSize(long length)
format File Size 
String result = null;
int sub_string = 0;
if (length >= 1073741824) {
    sub_string = String.valueOf((float) length / 1073741824)
            .indexOf(".");
    result = ((float) length / 1073741824 + "000").substring(0,
            sub_string + (length % 1073741824 > 0 ? 3 : 0)) + "G";
} else if (length >= 1048576) {
...
StringReadableByteCount(long bytes)
Readable Byte Count 
int unit = 1024;
if (bytes < unit)
    return bytes + " B";
int exp = (int) (Math.log(bytes) / Math.log(unit));
String pre = String.valueOf("KMGTPE".charAt(exp - 1));
return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);