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在manifest文件下注册android:sharedUserId="android.uid.system"。如：
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添加权限
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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
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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
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代码
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Activity
@Override public 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; }
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/**
* 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);
}
}