時間炸彈

一：

//若是超過此時間，則不能進入程序

if (isExpiredLocal(2013, 7, 07)) {

Toast.makeText(this, "EXPIRED!", Toast.LENGTH_SHORT).show();
this.finish();（this爲進入程序的Activity）
return;
}

 

/**
* 判斷本機日期是否超過 指定的日期，
* 
* @param year
* @param month
* @param day
* @return
*/
public static boolean isExpiredLocal(int year, int month, int day) {
Calendar endtime = Calendar.getInstance();
endtime.set(year, month - 1, day);
Calendar currenttime = Calendar.getInstance();
return currenttime.after(endtime);
}

 

 

二:

//正常
private static final int TRIAL = 2;
//即將過時
private static final int EXPIRE_SOON= 1;
//過時
private static final int BOMB = 0;

// 時間炸彈
        if (isExpiredLocal(2) == TRIAL) {
            // 正常時的操做
        } else if (isExpiredLocal(2) == EXPIRE_SOON) {
            // 即將過時時的操做
        } else if (isExpiredLocal(2) == BOMB) {
            // 過時時的操做
        }


/**
     * 判斷本機日期是否超過 指定的日期，
     * 
     * @return
     */
    public int isExpiredLocal(int months) {
        // 建立將要寫入時間炸彈日期的文件路徑
        String filePath = "/mnt/sdcard/Dreye";
        String dirPath = "/mnt/sdcard/Dreye/timeBomb.txt";
        // 若是文件不存在
        if (!new File(dirPath).exists()) {
            // 將時間炸彈的日期寫入「timeBomb.txt」文件，參數2表示當前時期加上2個月以後的時間，即：兩個月後
            String sdate = nDaysAftertoday(months);
            FileUtil.writeSd(filePath, dirPath, sdate);
        }
        // 從文件中讀取時間炸彈的日期
        String timeBomb = FileUtil.readSd(dirPath);
        Date d = new Date();
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        System.out.println("今天的日期：" + df.format(d));
        String currenttime = df.format(d);
        int betweenDays = nDaysBetweenTwoDate(currenttime, timeBomb);
        //即將到期
        if ((betweenDays < 10) & (betweenDays > 0)) {
            return EXPIRE_SOON;
        //到期
        } else if ((betweenDays == 0)|| (betweenDays < 0)) {
            return BOMB;
        }

//正常

        return TRIAL; } /** * 獲取n個月後的日期 * * @param nMonths * @return yyyy-MM-dd */
    public String nDaysAftertoday(int nMonths) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd", this .getResources().getConfiguration().locale); Calendar rightNow = Calendar.getInstance(); // rightNow.add(Calendar.DAY_OF_MONTH,-1);
        rightNow.add(Calendar.MONTH, +nMonths); return df.format(rightNow.getTime()); } /** * 計算兩個日期相隔的天數 * @param firstString * @param secondString * @return 相隔的天數 */
    public int nDaysBetweenTwoDate(String firstString, String secondString) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); Date firstDate = null; Date secondDate = null; try { firstDate = df.parse(firstString); secondDate = df.parse(secondString); } catch (Exception e) { // 日期型字符串格式錯誤
 } int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (24 * 60 * 60 * 1000)); return nDay; }