Android 10 系统源码 修改设备联网后，系统时间概率性没有自动更新

--- a/frameworks/base/core/java/android/util/NtpTrustedTime.java
+++ b/frameworks/base/core/java/android/util/NtpTrustedTime.java
@@ -57,6 +57,9 @@ public class NtpTrustedTime implements TrustedTime {
     private static int mNtpRetries = 0;
     private static int mNtpRetriesMax = 0;
     private static final String BACKUP_SERVER = "persist.backup.ntpServer";
+    private String[] mNtpServers = { "cn.ntp.org.cn", "edu.ntp.org.cn", "ntp1.aliyun.com", "ntp2.aliyun.com", "cn.pool.ntp.org" };
 
     private NtpTrustedTime(String server, long timeout) {
         if (LOGD) Log.d(TAG, "creating NtpTrustedTime using " + server);
@@ -160,6 +163,17 @@ public class NtpTrustedTime implements TrustedTime {
             mCachedNtpCertainty = client.getRoundTripTime() / 2;
             return true;
         } else {
+            for (String ntpServer : mNtpServers) {
+                if (client.requestTime(ntpServer, (int) mTimeout, network)) {
+                    mHasCache = true;
+                    mCachedNtpTime = client.getNtpTime();
+                    mCachedNtpElapsedRealtime = client.getNtpTimeReference();
+                    mCachedNtpCertainty = client.getRoundTripTime() / 2;
+                    return true;
+                }
+            }
             countInBackupmode();
             return false;
         }

修改时区

--- a/device/qcom/msm8953_64/msm8953_64.mk
+++ b/device/qcom/msm8953_64/msm8953_64.mk
@@ -585,3 +585,6 @@ PRODUCT_PROPERTY_OVERRIDES += 
 PRODUCT_PROPERTY_OVERRIDES += 
     ro.vendor.sensors.gravity=false 
     ro.vendor.sensors.laccel=false
+
+PRODUCT_PROPERTY_OVERRIDES += 
+       persist.sys.timezone=Asia/Shanghai