TimeZoneDetectorService类图
可以看出TimeZoneDetectorService类,其具体实现是由TimeZoneDetectorStrategy类完成的。
在TimeZoneDetectorService类中,三种更新时区的接口分别为:
suggestGeolocationTimeZone() //更新时区主要有三种方式 ,这是Geolocation方式
+boolean suggestManualTimeZone() //更新时区主要有三种方式 ,这是手动Manual方式
+void suggestTelephonyTimeZone( //更新时区主要有三种方式 ,这是手动telephony方式
而在TimeZoneDetectorStrategy中,三种更新时区的接口分别为:
void suggestTelephonyTimeZone()//这对应用telephony更新时区
boolean suggestManualTimeZone()//这对应用手动Manual更新时区
+void suggestGeolocationTimeZone()//这对应用Geolocation更新时区
其我们上面提到的doAutoTimeZoneDetection接口,更是关注的重点:
doAutoTimeZoneDetection()//针对三种更新时区的方式来更新时区
private void doAutoTimeZoneDetection(
@NonNull ConfigurationInternal currentUserConfig, @NonNull String detectionReason) {
// Use the correct algorithm based on the user's current configuration. If it changes, then
// detection will be re-run.
switch (currentUserConfig.getDetectionMode()) {
case ConfigurationInternal.DETECTION_MODE_MANUAL:
// No work to do.
break;
case ConfigurationInternal.DETECTION_MODE_GEO: {
boolean isGeoDetectionCertain = doGeolocationTimeZoneDetection(detectionReason);
// When geolocation detection is uncertain of the time zone, telephony detection
// can be used if telephony fallback is enabled and supported.
if (!isGeoDetectionCertain
&& mTelephonyTimeZoneFallbackEnabled.getValue()
&& currentUserConfig.isTelephonyFallbackSupported()) {
doTelephonyTimeZoneDetection(detectionReason + ", telephony fallback mode");
}
break;
}
case ConfigurationInternal.DETECTION_MODE_TELEPHONY:
doTelephonyTimeZoneDetection(detectionReason);
break;
default:
Slog.wtf(LOG_TAG, "Unknown detection mode: "
+ currentUserConfig.getDetectionMode());
}
}