Android10.0(Q) 网络自动校时bug修改

本文主要是介绍Android10.0(Q) 网络自动校时bug修改，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

问题现象

联网后系统时间依旧显示不对，和系统校时服务器有关系，之前低版本也修改过这个问题来着

修改方法

和之前低版本比对发现，以前的 NetworkTimeUpdateService 已经更名为 NewNetworkTimeUpdateService，而且代码变动不小，根据之前修改问题不大。

frameworks/base/services/core/java/com/android/server/NewNetworkTimeUpdateService.java

import java.io.PrintWriter;//M: For multiple NTP server retry
import java.util.ArrayList;
import android.os.AsyncTask;
import android.net.NetworkInfo;
+/*** Monitors the network time and updates the system time if it is out of sync* and there hasn't been any NITZ update from the carrier recently.
@@ -98,6 +103,18 @@ public class NewNetworkTimeUpdateService extends Binder implements NetworkTimeUp// connection to happen.private int mTryAgainCounter;//UGG add ,add ntp servers [S]                                         private static final String[] NTPSERVERLIST =  new String[]{"s1b.time.edu.cn","ntp3.aliyun.com","ntp4.aliyun.com","ntp5.aliyun.com",                                };                                        private AsyncTask ntpTimeTask;  private boolean isNtpTimeTaskRunning;  //UGG add ,add ntp servers [E] public NewNetworkTimeUpdateService(Context context) {mContext = context;mTime = NtpTrustedTime.getInstance(context);
@@ -138,6 +155,7 @@ public class NewNetworkTimeUpdateService extends Binder implements NetworkTimeUpprivate void registerForTelephonyIntents() {IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(TelephonyIntents.ACTION_NETWORK_SET_TIME);intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);mContext.registerReceiver(mNitzReceiver, intentFilter);}@@ -249,10 +267,49 @@ public class NewNetworkTimeUpdateService extends Binder implements NetworkTimeUpif (DBG) Log.d(TAG, "Received " + action);if (TelephonyIntents.ACTION_NETWORK_SET_TIME.equals(action)) {mNitzTimeSetTime = SystemClock.elapsedRealtime();}else if (ConnectivityManager.CONNECTIVITY_ACTION.equals(action)) {//UGG add ,add ntp servers [S]                                         NetworkInfo info = mCM.getActiveNetworkInfo();  if(info != null && info.isAvailable()) {String name = info.getTypeName();Log.d(TAG, "current networkType" + name);if(!isNtpTimeTaskRunning){isNtpTimeTaskRunning=true;new NtpTimeThread().start();}} else {Log.d(TAG, "no available network");// if(ntpTimeTask!=null){//     ntpTimeTask.cancel(true);// }}//UGG add ,add ntp servers [E]                                         }}};//UGG add ,add ntp servers [S]                                         public class NtpTimeThread extends Thread {@Overridepublic void run() {super.run();for(int i=0;i<NTPSERVERLIST.length;i++){try{sleep(1000);boolean result=GetNtpTIme.GetLocalNtpTime(NTPSERVERLIST[i]);Log.i(TAG,"NtpTimeThread result "+result);if(result){break;}}catch(Exception e){}}isNtpTimeTaskRunning=false;}}//UGG add ,add ntp servers [S]    /** Handler to do the network accesses on */private class MyHandler extends Handler {

同级目录下新增 GetNtpTIme.java 和 NtpMessage.java

frameworks/base/services/core/java/com/android/server/GetNtpTIme.java

package com.android.server;import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.ConnectException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.NoRouteToHostException;
import java.net.UnknownHostException;
import java.util.Date;import android.os.SystemClock;
import android.util.Log;public class GetNtpTIme {private static String TAG="NetworkTimeUpdateService.GetNtpTIme";public static boolean GetLocalNtpTime(String ntpSvrIP) {boolean res = false;int retry = 0;int port = 123;int timeout = 10000;// get the address and NTP address requestInetAddress ipv4Addr = null;try {if(ntpSvrIP==null){ipv4Addr = InetAddress.getByName("s1b.time.edu.cn");}else{ipv4Addr = InetAddress.getByName(ntpSvrIP);}Log.d(TAG, "ntpSvrIP : " + ntpSvrIP+", ipv4Addr : "+ipv4Addr);} catch (UnknownHostException e1) {e1.printStackTrace();}int serviceStatus = -1;DatagramSocket socket = null;long responseTime = -1;try {socket = new DatagramSocket();socket.setSoTimeout(timeout); // will force the// InterruptedIOExceptionfor (int attempts = 0; attempts <= retry && serviceStatus != 1; attempts++) {try {// Send NTP requestbyte[] data = new NtpMessage().toByteArray();DatagramPacket outgoing = new DatagramPacket(data,data.length, ipv4Addr, port);long sentTime = System.currentTimeMillis();socket.send(outgoing);// Get NTP ResponseDatagramPacket incoming = new DatagramPacket(data,data.length);socket.receive(incoming);responseTime = System.currentTimeMillis() - sentTime;double destinationTimestamp = (System.currentTimeMillis() / 1000.0) + 2208988800.0;// 这里要加2208988800，是因为获得到的时间是格林尼治时间，所以要变成东八区的时间，否则会与与北京时间有8小时的时差// Validate NTP Response// IOException thrown if packet does not decode as expected.NtpMessage msg = new NtpMessage(incoming.getData());double localClockOffset = ((msg.receiveTimestamp - msg.originateTimestamp) + (msg.transmitTimestamp - destinationTimestamp)) / 2;Log.d(TAG,"poll: valid NTP request received the local clock offset is "+ localClockOffset + ", responseTime= "+ responseTime + "ms");Log.d(TAG, "poll: NTP message : " + msg.toString());SystemClock.setCurrentTimeMillis(msg.GetCurrentMS(msg.transmitTimestamp));serviceStatus = 1;res = true;} catch (Exception ex1) {// Ignore, no response received.Log.d(TAG, "InterruptedIOException: "+ ex1.toString());}}} catch (NoRouteToHostException e) {Log.d(TAG, "No route to host exception for address: "+ ipv4Addr);} catch (ConnectException e) {// Connection refused. Continue to retry.e.fillInStackTrace();Log.d(TAG, "Connection exception for address: " + ipv4Addr);} catch (IOException ex) {ex.fillInStackTrace();Log.d(TAG, "IOException while polling address: " + ipv4Addr);} finally {if (socket != null){socket.close();Log.d(TAG, "ntp address: " + ipv4Addr+" res:"+String.valueOf(res));return res;}}// Store response time if available//if (serviceStatus == 1) {Log.d(TAG, "responsetime==" + responseTime);}return res;}
}

frameworks/base/services/core/java/com/android/server/NtpMessage.java

package com.android.server;import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;public class NtpMessage {  /** *//** * This is a two-bit code warning of an impending leap second to be * inserted/deleted in the last minute of the current day. It''s values may * be as follows: *  * Value Meaning ----- ------- 0 no warning 1 last minute has 61 seconds 2 * last minute has 59 seconds) 3 alarm condition (clock not synchronized) */  public byte leapIndicator = 0;  /** *//** * This value indicates the NTP/SNTP version number. The version number is 3 * for Version 3 (IPv4 only) and 4 for Version 4 (IPv4, IPv6 and OSI). If * necessary to distinguish between IPv4, IPv6 and OSI, the encapsulating * context must be inspected. */  public byte version = 3;  /** *//** * This value indicates the mode, with values defined as follows: *  * Mode Meaning ---- ------- 0 reserved 1 symmetric active 2 symmetric * passive 3 client 4 server 5 broadcast 6 reserved for NTP control message * 7 reserved for private use *  * In unicast and anycast modes, the client sets this field to 3 (client) in * the request and the server sets it to 4 (server) in the reply. In * multicast mode, the server sets this field to 5 (broadcast). */  public byte mode = 0;  /** *//** * This value indicates the stratum level of the local clock, with values * defined as follows: *  * Stratum Meaning ---------------------------------------------- 0 * unspecified or unavailable 1 primary reference (e.g., radio clock) 2-15 * secondary reference (via NTP or SNTP) 16-255 reserved */  public short stratum = 0;  /** *//** * This value indicates the maximum interval between successive messages, in * seconds to the nearest power of two. The values that can appear in this * field presently range from 4 (16 s) to 14 (16284 s); however, most * applications use only the sub-range 6 (64 s) to 10 (1024 s). */  public byte pollInterval = 0;  /** *//** * This value indicates the precision of the local clock, in seconds to the * nearest power of two. The values that normally appear in this field * range from -6 for mains-frequency clocks to -20 for microsecond clocks * found in some workstations. */  public byte precision = 0;  /** *//** * This value indicates the total roundtrip delay to the primary reference * source, in seconds. Note that this variable can take on both positive and * negative values, depending on the relative time and frequency offsets. * The values that normally appear in this field range from negative values * of a few milliseconds to positive values of several hundred milliseconds. */  public double rootDelay = 0;  /** *//** * This value indicates the nominal error relative to the primary reference * source, in seconds. The values that normally appear in this field range * from 0 to several hundred milliseconds. */  public double rootDispersion = 0;  /** *//** * This is a 4-byte array identifying the particular reference source. In * the case of NTP Version 3 or Version 4 stratum-0 (unspecified) or * stratum-1 (primary) servers, this is a four-character ASCII string, left * justified and zero padded to 32 bits. In NTP Version 3 secondary servers, * this is the 32-bit IPv4 address of the reference source. In NTP Version 4 * secondary servers, this is the low order 32 bits of the latest transmit * timestamp of the reference source. NTP primary (stratum 1) servers should * set this field to a code identifying the external reference source * according to the following list. If the external reference is one of * those listed, the associated code should be used. Codes for sources not * listed can be contrived as appropriate. *  * Code External Reference Source ---- ------------------------- LOCL * uncalibrated local clock used as a primary reference for a subnet without * external means of synchronization PPS atomic clock or other * pulse-per-second source individually calibrated to national standards * ACTS NIST dialup modem service USNO USNO modem service PTB PTB (Germany) * modem service TDF Allouis (France) Radio 164 kHz DCF Mainflingen * (Germany) Radio 77.5 kHz MSF Rugby (UK) Radio 60 kHz WWV Ft. Collins (US) * Radio 2.5, 5, 10, 15, 20 MHz WWVB Boulder (US) Radio 60 kHz WWVH Kaui * Hawaii (US) Radio 2.5, 5, 10, 15 MHz CHU Ottawa (Canada) Radio 3330, * 7335, 14670 kHz LORC LORAN-C radionavigation system OMEG OMEGA * radionavigation system GPS Global Positioning Service GOES Geostationary * Orbit Environment Satellite */  public byte[] referenceIdentifier = { 0, 0, 0, 0 };  /** *//** * This is the time at which the local clock was last set or corrected, in * seconds since 00:00 1-Jan-1900. */  public double referenceTimestamp = 0;  /** *//** * This is the time at which the request departed the client for the server, * in seconds since 00:00 1-Jan-1900. */  public double originateTimestamp = 0;  /** *//** * This is the time at which the request arrived at the server, in seconds * since 00:00 1-Jan-1900. */  public double receiveTimestamp = 0;  /** *//** * This is the time at which the reply departed the server for the client, * in seconds since 00:00 1-Jan-1900. */  public double transmitTimestamp = 0;  /** *//** * Constructs a new NtpMessage from an array of bytes. */  public NtpMessage(byte[] array) {  // See the packet format diagram in RFC 2030 for details  leapIndicator = (byte) ((array[0] >> 6) & 0x3);  version = (byte) ((array[0] >> 3) & 0x7);  mode = (byte) (array[0] & 0x7);  stratum = unsignedByteToShort(array[1]);  pollInterval = array[2];  precision = array[3];  rootDelay = (array[4] * 256.0) + unsignedByteToShort(array[5]) + (unsignedByteToShort(array[6]) / 256.0) + (unsignedByteToShort(array[7]) / 65536.0);  rootDispersion = (unsignedByteToShort(array[8]) * 256.0) + unsignedByteToShort(array[9]) + (unsignedByteToShort(array[10]) / 256.0) + (unsignedByteToShort(array[11]) / 65536.0);  referenceIdentifier[0] = array[12];  referenceIdentifier[1] = array[13];  referenceIdentifier[2] = array[14];  referenceIdentifier[3] = array[15];  referenceTimestamp = decodeTimestamp(array, 16);  originateTimestamp = decodeTimestamp(array, 24);  receiveTimestamp = decodeTimestamp(array, 32);  transmitTimestamp = decodeTimestamp(array, 40);  }  /** *//** * Constructs a new NtpMessage */  public NtpMessage(byte leapIndicator, byte version, byte mode, short stratum, byte pollInterval, byte precision, double rootDelay, double rootDispersion, byte[] referenceIdentifier, double referenceTimestamp, double originateTimestamp, double receiveTimestamp, double transmitTimestamp) {  // ToDo: Validity checking  this.leapIndicator = leapIndicator;  this.version = version;  this.mode = mode;  this.stratum = stratum;  this.pollInterval = pollInterval;  this.precision = precision;  this.rootDelay = rootDelay;  this.rootDispersion = rootDispersion;  this.referenceIdentifier = referenceIdentifier;  this.referenceTimestamp = referenceTimestamp;  this.originateTimestamp = originateTimestamp;  this.receiveTimestamp = receiveTimestamp;  this.transmitTimestamp = transmitTimestamp;  }  /** *//** * Constructs a new NtpMessage in client -> server mode, and sets the * transmit timestamp to the current time. */  public NtpMessage() {  // Note that all the other member variables are already set with  // appropriate default values.  this.mode = 3;  this.transmitTimestamp = (System.currentTimeMillis() / 1000.0) + 2208988800.0;  }  /** *//** * This method constructs the data bytes of a raw NTP packet. */  public byte[] toByteArray() {  // All bytes are automatically set to 0  byte[] p = new byte[48];  p[0] = (byte) (leapIndicator << 6 | version << 3 | mode);  p[1] = (byte) stratum;  p[2] = (byte) pollInterval;  p[3] = (byte) precision;  // root delay is a signed 16.16-bit FP, in Java an int is 32-bits  int l = (int) (rootDelay * 65536.0);  p[4] = (byte) ((l >> 24) & 0xFF);  p[5] = (byte) ((l >> 16) & 0xFF);  p[6] = (byte) ((l >> 8) & 0xFF);  p[7] = (byte) (l & 0xFF);  // root dispersion is an unsigned 16.16-bit FP, in Java there are no  // unsigned primitive types, so we use a long which is 64-bits  long ul = (long) (rootDispersion * 65536.0);  p[8] = (byte) ((ul >> 24) & 0xFF);  p[9] = (byte) ((ul >> 16) & 0xFF);  p[10] = (byte) ((ul >> 8) & 0xFF);  p[11] = (byte) (ul & 0xFF);  p[12] = referenceIdentifier[0];  p[13] = referenceIdentifier[1];  p[14] = referenceIdentifier[2];  p[15] = referenceIdentifier[3];  encodeTimestamp(p, 16, referenceTimestamp);  encodeTimestamp(p, 24, originateTimestamp);  encodeTimestamp(p, 32, receiveTimestamp);  encodeTimestamp(p, 40, transmitTimestamp);  return p;  }  /** *//** * Returns a string representation of a NtpMessage */  public String toString() {  String precisionStr = new DecimalFormat("0.#E0").format(Math.pow(2, precision));  return "Leap indicator: " + leapIndicator + " " + "Version: " + version + " " + "Mode: " + mode + " " + "Stratum: " + stratum + " " + "Poll: " + pollInterval + " " + "Precision: " + precision + " (" + precisionStr + " seconds) " + "Root delay: " + new DecimalFormat("0.00").format(rootDelay * 1000) + " ms " + "Root dispersion: " + new DecimalFormat("0.00").format(rootDispersion * 1000) + " ms " + "Reference identifier: " + referenceIdentifierToString(referenceIdentifier, stratum, version) + " " + "Reference timestamp: " + timestampToString(referenceTimestamp) + " " + "Originate timestamp: " + timestampToString(originateTimestamp) + " " + "Receive timestamp:   " + timestampToString(receiveTimestamp) + " " + "Transmit timestamp: " + timestampToString(transmitTimestamp);  }  /** *//** * Converts an unsigned byte to a short. By default, Java assumes that a * byte is signed. */  public static short unsignedByteToShort(byte b) {  if ((b & 0x80) == 0x80)  return (short) (128 + (b & 0x7f));  else  return (short) b;  }  /** *//** * Will read 8 bytes of a message beginning at <code>pointer</code> and * return it as a double, according to the NTP 64-bit timestamp format. */  public static double decodeTimestamp(byte[] array, int pointer) {  double r = 0.0;  for (int i = 0; i < 8; i++) {  r += unsignedByteToShort(array[pointer + i]) * Math.pow(2, (3 - i) * 8);  }  return r;  }  /** *//** * Encodes a timestamp in the specified position in the message */  public static void encodeTimestamp(byte[] array, int pointer, double timestamp) {  // Converts a double into a 64-bit fixed point  for (int i = 0; i < 8; i++) {  // 2^24, 2^16, 2^8, .. 2^-32  double base = Math.pow(2, (3 - i) * 8);  // Capture byte value  array[pointer + i] = (byte) (timestamp / base);  // Subtract captured value from remaining total  timestamp = timestamp - (double) (unsignedByteToShort(array[pointer + i]) * base);  }  // From RFC 2030: It is advisable to fill the non-significant  // low order bits of the timestamp with a random, unbiased  // bitstring, both to avoid systematic roundoff errors and as  // a means of loop detection and replay detection.  array[7] = (byte) (Math.random() * 255.0);  }  /** *//** * Returns a timestamp (number of seconds since 00:00 1-Jan-1900) as a * formatted date/time string. */  public static String timestampToString(double timestamp) {  if (timestamp == 0)  return "0";  // timestamp is relative to 1900, utc is used by Java and is relative  // to 1970  double utc = timestamp - (2208988800.0);  // milliseconds  long ms = (long) (utc * 1000.0);  // date/time  String date = new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss").format(new Date(ms));  // fraction  double fraction = timestamp - ((long) timestamp);  String fractionSting = new DecimalFormat(".000000").format(fraction);  return date + fractionSting;  }  public long GetCurrentMS(double timestamp){if (timestamp == 0)  return 0;  // timestamp is relative to 1900, utc is used by Java and is relative  // to 1970  double utc = timestamp - (2208988800.0);  // milliseconds  long ms = (long) (utc * 1000.0);  return ms;}/** *//** * Returns a string representation of a reference identifier according to * the rules set out in RFC 2030. */  public static String referenceIdentifierToString(byte[] ref, short stratum, byte version) {  // From the RFC 2030:  // In the case of NTP Version 3 or Version 4 stratum-0 (unspecified)  // or stratum-1 (primary) servers, this is a four-character ASCII  // string, left justified and zero padded to 32 bits.  if (stratum == 0 || stratum == 1) {  return new String(ref);  }  // In NTP Version 3 secondary servers, this is the 32-bit IPv4  // address of the reference source.  else if (version == 3) {  return unsignedByteToShort(ref[0]) + "." + unsignedByteToShort(ref[1]) + "." + unsignedByteToShort(ref[2]) + "." + unsignedByteToShort(ref[3]);  }  // In NTP Version 4 secondary servers, this is the low order 32 bits  // of the latest transmit timestamp of the reference source.  else if (version == 4) {  return "" + ((unsignedByteToShort(ref[0]) / 256.0) + (unsignedByteToShort(ref[1]) / 65536.0) + (unsignedByteToShort(ref[2]) / 16777216.0) + (unsignedByteToShort(ref[3]) / 4294967296.0));  }  return "";  }  
}  

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