android7.0修改系统默认时间

    客户需求：修改默认系统时间为2017/1/1，即烧机后开机显示的时间。

 

Index: SystemServer.java===================================================================--- SystemServer.java(revision 5703)+++ SystemServer.java(revision 5704)@@ -129,8 +129,8 @@      // The earliest supported time.  We pick one day into 1970, to     // give any timezone code room without going into negative time.   -    //wangxx modify for default time 20170705 start-    //private static final long EARLIEST_SUPPORTED_TIME = 1451577600L * 1000;+    //wangxx modify for default time 20170706 start+    private static final long EARLIEST_SUPPORTED_TIME_TEMP = 1451577600L * 1000;     private static final long EARLIEST_SUPPORTED_TIME =  1483200000000L; //20170101 00:00  /*86400 * 1000*/     //wangxx modify for default time 20170705 end @@ -242,10 +242,14 @@             // APIs crash dealing with negative numbers, notably             // java.io.File#setLastModified, so instead we fake it and             // hope that time from cell towers or NTP fixes it shortly.-            /*if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME) { //wangxx modify for default time 20170705 start-                Slog.w(TAG, "System clock is before 1970; setting to 1970.");-                SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME);-            }*/ //wangxx modify for default time 20170705 end+            //wangxx modify for default time 20170706 start+boolean firstBoot = SystemProperties.getBoolean("persist.sys.firstboot", true);+    if(!firstBoot){//wangxx modify for default time 20170705 start+    if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME_TEMP) {+Slog.w(TAG, "System clock is before 1970; setting to 1970.");+                    SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME_TEMP);+                }+    }//wangxx modify for default time 20170706 end              // If the system has "persist.sys.language" and friends set, replace them with             // "persist.sys.locale". Note that the default locale at this point is calculated@@ -350,11 +354,16 @@         } finally {             Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);         }-        //wangxx modify for default time 20170705 start+        //wangxx modify for default time 20170706 start+boolean firstBoot = SystemProperties.getBoolean("persist.sys.firstboot", true);         Slog.w("XXX", "SystemServer ==> System.currentTimeMillis()=" + System.currentTimeMillis()); -        if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME) {//1220093030 -            SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME);-        }//wangxx modify for default time 20170705 end+if(firstBoot){+            if (System.currentTimeMillis() != EARLIEST_SUPPORTED_TIME) {//1220093030 +               SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME);+            }+SystemProperties.set("persist.sys.firstboot", "false");+}//wangxx modify for default time 20170706 end+                 // For debug builds, log event loop stalls to dropbox for analysis.         if (StrictMode.conditionallyEnableDebugLogging()) {             Slog.i(TAG, "Enabled StrictMode for system server main thread.");

    解决方案：费了很大周折才弄好，贴出来，希望能帮助到网友

android\vendor\qcom\proprietary\time-services\time_daemon_qmi.c

#define DEFAULT_TIME 1

static int genoff_post_init(time_genoff_ptr time_genoff){int rc;if (time_genoff->init_func != NULL) {rc = time_genoff->init_func();if (rc) {TIME_LOGE("Daemon:%s:Init func failed\n", __func__);return -EINVAL;}}if (time_genoff->per_storage_spec.initialized == 1) {/* Read from the generic offset */rc = time_persistent_memory_opr(time_genoff->per_storage_spec.f_name,TIME_READ_MEMORY, &(time_genoff->generic_offset));if (rc) {TIME_LOGD("Daemon:%s:Error in accessing storage\n",__func__);#if DEFAULT_TIME ///force system time = 2017/1/1            time_genoff->generic_offset = (uint64_t)SEC_TO_MSEC (((117-70) * 365 * 86400) -            (3 * 86400)) - time_genoff->generic_offset;#elsetime_genoff->generic_offset = 0;#endif}}time_genoff->initialized = 1;return 0;}

其中黄色为添加代码(及修改代码)

做这个需求很是折腾，项目要量产，快量产时需求才给出，网上搜索了好多没有一个比较好的或者完整的修改方案，为此加班了大半夜。之前使用的是高通给的修改5.0的patch，结果引起问题，后面会给出5.0的方案。这是高通给的7.0的patch，被坑了一把，刚开始时给的时候少了个括号，没太注意，一直编译不过，但是编译报错又没报这个地方的错误，也没想到是修改这段代码的问题，一直以为是服务器的问题，再加上7.0之后编译系统源码使用jack-server特别慢，很少费劲，有编译好的方案，希望网友可以提供下，感谢。time_genoff->generic_offset这个值不好打log，无法确定是多少，所以改为2017/1/1号的时候费了些周折(先改一遍，看时间A，然后根据想要的时间B和A差几天，再做调整)，网友在修改的时候需根据自己的源码情况适当修改时间日期。

117为2017年意思，

70为1970，365天，每天86400秒

再修改时，根据实际情况适当调整 3 * 86400这个时间段(3天)

5.0时高通给的pathch(逻辑上是有问题的，不过当时能用<不知道为啥没出错>，就没管，上面7.0的方案5.0应该也是适用的，最好使用上面的方案)

./frameworks/base/services/java/com/android/server/SystemServer.java
1）EARLIEST_SUPPORTED_TIME 赋值为 1199275200000L;
即 private static final long EARLIEST_SUPPORTED_TIME = 1199275200000L;
把 SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME) 这句代码放到startOtherServices()后面；