//如果超过此时间，则不能进入程序if (isExpiredLocal(2013, 7, 07)) {Toast.makeText(this, "EXPIRED!", Toast.LENGTH_SHORT).show();this.finish();（this为进入程序的Activity）return;} /*** 判断本机日期是否超过 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);}

//正常private static final int TRIAL = 2;//即将过期private static final int EXPIRE_SOON= 1;//过期private static final int BOMB = 0;// 时间炸弹        if (isExpiredLocal(2) == TRIAL) {            // 正常时的操作        } else if (isExpiredLocal(2) == EXPIRE_SOON) {            // 即将过期时的操作        } else if (isExpiredLocal(2) == BOMB) {            // 过期时的操作        }/**     * 判断本机日期是否超过 指定的日期，     *      * @return     */    public int isExpiredLocal(int months) {        // 创建将要写入时间炸弹日期的文件路径        String filePath = "/mnt/sdcard/Dreye";        String dirPath = "/mnt/sdcard/Dreye/timeBomb.txt";        // 如果文件不存在        if (!new File(dirPath).exists()) {            // 将时间炸弹的日期写入“timeBomb.txt”文件，参数2表示当前时期加上2个月之后的时间，即：两个月后            String sdate = nDaysAftertoday(months);            FileUtil.writeSd(filePath, dirPath, sdate);        }        // 从文件中读取时间炸弹的日期        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);        //即将到期        if ((betweenDays < 10) & (betweenDays > 0)) {            return EXPIRE_SOON;        //到期        } else if ((betweenDays == 0)|| (betweenDays < 0)) {            return BOMB;        }

//正常

        return TRIAL;    }    /**     * 获取n个月后的日期     *      * @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());    }    /**     * 计算两个日期相隔的天数     * @param firstString     * @param secondString     * @return 相隔的天数     */    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) {            // 日期型字符串格式错误        }        int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (24 * 60 * 60 * 1000));        return nDay;    }