Android(安卓)为apk文件签名，增加修改系统时间等权限

在manifest文件下注册android:sharedUserId="android.uid.system"。如：
添加权限
设置签名
- 把打包的apk文件和签名文件（platform.pk8、platform.x509.pem、signapk.jar《要对应系统的版本》）放到创建的sign文件夹中
- 打开命令提示符窗口，定位到sign文件路径下，输入下面的命令
```
     java -jar signapk.jar platform.x509.pem platform.pk8 test.apk testnew.apk
```
  - set.apk 是指我们要签名的原始文件apk，setnew.apk 是指我们签名后输出的apk文件的名称

代码

Activity

@Overridepublic void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //校时      correctTime();}private void correctTime() {      new Thread(){            @Override            public void run() {                    long time= TimeCorrectUtil.getTimeFromNtpServer("ntp1.aliyun.com");                    AlarmManager alarmManager= (AlarmManager)                                 context.getSystemService(Activity.ALARM_SERVICE);                    alarmManager.setTime(time);                    LogUtil.e("ntp服务器地址获取的时间为：=="+new SimpleDateFormat("yyyy-MM-dd                             HH:mm:ss").format(time));          }    }.start();}/** * 从ntp服务器中获取时间 * * @param ntpHost ntp服务器域名地址 * @return 如果失败返回-1，否则返回当前的毫秒数 */public static long getTimeFromNtpServer(String ntpHost) {      Log.i(LOG_TAG, "get time from " + ntpHost);      SntpClient client = new SntpClient();      boolean isSuccessful = client.requestTime(ntpHost, NTP_TIME_OUT_MILLISECOND);      if (isSuccessful) {              return client.getNtpTime();      }      return -1;}

SntpClient

public class SntpClient {        private static final String TAG = "SntpClient";        private static final int REFERENCE_TIME_OFFSET = 16;        private static final int ORIGINATE_TIME_OFFSET = 24;        private static final int RECEIVE_TIME_OFFSET = 32;        private static final int TRANSMIT_TIME_OFFSET = 40;        private static final int NTP_PACKET_SIZE = 48;        private static final int NTP_PORT = 123;        private static final int NTP_MODE_CLIENT = 3;        private static final int NTP_VERSION = 3;        // Number of seconds between Jan 1, 1900 and Jan 1, 1970       // 70 years plus 17 leap days        private static final long OFFSET_1900_TO_1970 = ((365L * 70L) + 17L) * 24L * 60L * 60L;        // system time computed from NTP server response        private long mNtpTime;        // value of SystemClock.elapsedRealtime() corresponding to mNtpTime        private long mNtpTimeReference;        // round trip time in milliseconds        private long mRoundTripTime;        /**         * Sends an SNTP request to the given host and processes the response.         *         * @param host    host name of the server.         * @param timeout network timeout in milliseconds.         * @return true if the transaction was successful.         */      public boolean requestTime(String host, int timeout) {          DatagramSocket socket = null;            try {                  socket = new DatagramSocket();                   socket.setSoTimeout(timeout);                    InetAddress address = InetAddress.getByName(host);                    byte[] buffer = new byte[NTP_PACKET_SIZE];                    DatagramPacket request = new DatagramPacket(buffer, buffer.length, address, NTP_PORT);                  // set mode = 3 (client) and version = 3                // mode is in low 3 bits of first byte              // version is in bits 3-5 of first byte              buffer[0] = NTP_MODE_CLIENT | (NTP_VERSION << 3);            // get current time and write it to the request packet            long requestTime = System.currentTimeMillis();            long requestTicks = SystemClock.elapsedRealtime();            writeTimeStamp(buffer, TRANSMIT_TIME_OFFSET, requestTime);            socket.send(request);            // read the response            DatagramPacket response = new DatagramPacket(buffer, buffer.length);            socket.receive(response);            long responseTicks = SystemClock.elapsedRealtime();            long responseTime = requestTime + (responseTicks - requestTicks);            // extract the results            long originateTime = readTimeStamp(buffer, ORIGINATE_TIME_OFFSET);            long receiveTime = readTimeStamp(buffer, RECEIVE_TIME_OFFSET);            long transmitTime = readTimeStamp(buffer, TRANSMIT_TIME_OFFSET);            long roundTripTime = responseTicks - requestTicks - (transmitTime - receiveTime);          // receiveTime = originateTime + transit + skew          // responseTime = transmitTime + transit - skew          // clockOffset = ((receiveTime - originateTime) + (transmitTime - responseTime))/2          //             = ((originateTime + transit + skew - originateTime) +          //                (transmitTime - (transmitTime + transit - skew)))/2          //             = ((transit + skew) + (transmitTime - transmitTime - transit + skew))/2          //             = (transit + skew - transit + skew)/2          //             = (2 * skew)/2 = skew          long clockOffset = ((receiveTime - originateTime) + (transmitTime - responseTime)) / 2;        // if (false) Log.d(TAG, "round trip: " + roundTripTime + " ms");        // if (false) Log.d(TAG, "clock offset: " + clockOffset + " ms");        // save our results - use the times on this side of the network latency        // (response rather than request time)        mNtpTime = responseTime + clockOffset;        mNtpTimeReference = responseTicks;        mRoundTripTime = roundTripTime;  } catch (Exception e) {        if (false) Log.d(TAG, "request time failed: " + e);        return false;  } finally {        if (socket != null) {              socket.close();      }  }      return true; }  /** * Returns the reference clock value (value of               SystemClock.elapsedRealtime())   * corresponding to the NTP time.   *   * @return reference clock corresponding to the NTP time.   */    public long getNtpTimeReference() {        return mNtpTimeReference;    }    /**     * Returns the round trip time of the NTP transaction     *     * @return round trip time in milliseconds.     */      public long getRoundTripTime() {            return mRoundTripTime;      }

    /**     *  Reads an unsigned 32 bit big endian number from the given offset in the buffer.     */    private long read32(byte[] buffer, int offset) {        byte b0 = buffer[offset];        byte b1 = buffer[offset + 1];        byte b2 = buffer[offset + 2];        byte b3 = buffer[offset + 3];        // convert signed bytes to unsigned values        int i0 = ((b0 & 0x80) == 0x80 ? (b0 & 0x7F) + 0x80 : b0);        int i1 = ((b1 & 0x80) == 0x80 ? (b1 & 0x7F) + 0x80 : b1);        int i2 = ((b2 & 0x80) == 0x80 ? (b2 & 0x7F) + 0x80 : b2);        int i3 = ((b3 & 0x80) == 0x80 ? (b3 & 0x7F) + 0x80 : b3);        return ((long) i0 << 24) + ((long) i1 << 16) + ((long) i2 << 8) + (long) i3;    }    /**     * Reads the NTP time stamp at the given offset in the buffer and returns     * it as a system time (milliseconds since January 1, 1970).     */    private long readTimeStamp(byte[] buffer, int offset) {        long seconds = read32(buffer, offset);        long fraction = read32(buffer, offset + 4);        return ((seconds - OFFSET_1900_TO_1970) * 1000) + ((fraction * 1000L) / 0x100000000L);    }    /**     * Writes system time (milliseconds since January 1, 1970) as an NTP time stamp     * at the given offset in the buffer.     */    private void writeTimeStamp(byte[] buffer, int offset, long time) {        long seconds = time / 1000L;        long milliseconds = time - seconds * 1000L;        seconds += OFFSET_1900_TO_1970;        // write seconds in big endian format        buffer[offset++] = (byte) (seconds >> 24);        buffer[offset++] = (byte) (seconds >> 16);        buffer[offset++] = (byte) (seconds >> 8);        buffer[offset++] = (byte) (seconds >> 0);        long fraction = milliseconds * 0x100000000L / 1000L;        // write fraction in big endian format        buffer[offset++] = (byte) (fraction >> 24);        buffer[offset++] = (byte) (fraction >> 16);        buffer[offset++] = (byte) (fraction >> 8);        // low order bits should be random data        buffer[offset++] = (byte) (Math.random() * 255.0);    }}

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