Android数据格式化

1、文件大小格式化：

Log.d(TAG, Formatter.formatFileSize(this, 100));
    //100 B
    Log.d(TAG, Formatter.formatFileSize(this, 1024*2));
    //2.00 KB
    Log.d(TAG, Formatter.formatFileSize(this, 10000000));
    //9.54 MB

2、日期格式化：

int flagsDate = DateUtils.FORMAT_SHOW_DATE;  
    int flagsTime = DateUtils.FORMAT_SHOW_TIME ;  
    int flagsWeek = DateUtils.FORMAT_SHOW_WEEKDAY;  
    int flags_time = DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_24HOUR;  

    String dateStr = (String)DateUtils.formatDateTime(this, System.currentTimeMillis(), flagsDate);    
    //7月8日
    String timeStr = (String)DateUtils.formatDateTime(this, System.currentTimeMillis(), flagsTime);    
    //下午1:33
    String weekStr = (String)DateUtils.formatDateTime(this, System.currentTimeMillis(), flagsWeek);    
    //星期二
    String amPmStr = DateUtils.getAMPMString(Calendar.getInstance().get(Calendar.AM_PM));              
    //下午
    String datetime = DateFormat.format("yyyy:MM:dd kk:mm:ss", System.currentTimeMillis()).toString(); 
    //2014:07:08 13:33:23

    String datetime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(System.currentTimeMillis())); 
    //2014:07:08 13:33:23

    String time = (String)DateUtils.formatDateTime(this, System.currentTimeMillis(), flags_time);      
    //13:33
    boolean isToday = DateUtils.isToday(System.currentTimeMillis());                                   
    //true

3、时间格式化

String.format("%d:%02d:%02d", hours, minutes, seconds).toString();