Android 时间戳的转换

在Android应用中，经常会碰到后台的时间是时间戳而现实的需要今天什么时候，昨天什么时候，就像微博的时间显示一样。现在我上一个把时间戳转换的代码：

 public static String getTime(int timestamp) {
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         String time = null;
         try {
             java.util.Date currentdate = new java.util.Date();// 当前时间

             long i = (currentdate.getTime() / 1000 - timestamp) / (60);
             Timestamp now = new Timestamp(System.currentTimeMillis());// 获取系统当前时间
             String str = sdf.format(new Timestamp(IntToLong(timestamp)));
             time = str.substring(11, 16);
             String year = str.substring(0, 4);
             String month = str.substring(5, 7);
             String day = str.substring(8, 10);
             System.out.println(str);
             System.out.println(time);
             System.out.println(getDate(year, month, day));
             time = getDate(year, month, day) + time;
         } catch (Exception e) {
             e.printStackTrace();
         }
         return time;
     }

     // java Timestamp构造函数需传入Long型
     public static long IntToLong(int i) {
         long result = (long) i;
         result *= 1000;
         return result;
     }

     public static String getDate(final String year, final String month,
             final String day) {
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 24小时制
         java.util.Date d = new java.util.Date();
         String str = sdf.format(d);
         String nowmonth = str.substring(5, 7);
         String nowday = str.substring(8, 10);
         String result = null;

         int temp = Integer.parseInt(nowday) - Integer.parseInt(day);
         switch (temp) {
         case 0:
             result = "今天";
             break;
         case 1:
             result = "昨天";
             break;
         case 2:
             result = "前天";
             break;
         default:
             StringBuilder sb = new StringBuilder();
             sb.append(year).append("-");
             sb.append(month).append("-");
             sb.append(day).append(" ");
             result = sb.toString();
             break;
         }
         return result;
     }