Clock display of Android4.4 systemui analysis

The time on the Systemui is displayed as long as it is on the/frameworks/base/packages/systemui/src/com/android/systemui/statusbar/policy/clock.java class

This class is also very simple, listening and processing broadcast

@Overrideprotected void Onattachedtowindow () {Super.onattachedtowindow (); if (!mattached) {mattached = True;i Ntentfilter filter = new Intentfilter (); filter.addaction (Intent.action_time_tick); Filter.addaction (Intent.ACTION_ time_changed); filter.addaction (intent.action_timezone_changed); Filter.addaction (Intent.action_configuration_ CHANGED); filter.addaction (intent.action_user_switched); GetContext (). Registerreceiver (Mintentreceiver, filter, Null,gethandler ());} Note:it's safe to does these after registering the receiver since the//receiver all runs//in the main thread, there Fore the receiver can ' t run before this//method returns.//The time zone may has changed while the receiver wasn ' t Regis tered,//so update the Timemcalendar = Calendar.getinstance (Timezone.getdefault ());/Make sure we update to the current T Imeupdateclock ();} @Overrideprotected void Ondetachedfromwindow () {Super.ondetachedfromwindow (); if (mattached) {getcontext (). Unregisterreceiver (mintentreceiver); mattached = FalSe;}} 

To update time on the radio

Private final Broadcastreceiver mintentreceiver = new Broadcastreceiver () {@Overridepublic void OnReceive (Context Context, Intent Intent) {String action = intent.getaction (); LOG.D (TAG, "action =" + action), if (Action.equals (intent.action_timezone_changed)) {String TZ = Intent.getstringextra (" Time-zone "); Mcalendar = Calendar.getinstance (Timezone.gettimezone (TZ)); if (Mclockformat! = null) { Mclockformat.settimezone (Mcalendar.gettimezone ());} LOG.D (TAG, "Mcalendar =" + mcalendar+ "timezone.gettimezone (TZ) =" + Timezone.gettimezone (TZ));} else if (action.equals (intent.action_configuration_changed)) {final Locale Newlocale = Getresources (). GetConfiguration (). Locale;if (!newlocale.equals (Mlocale)) {Mlocale = Newlocale;mclockformatstring = ""; Force Refresh}}updateclock ();};

In the settings can change the time display is 12 hours or 24 hours

The format composition of time is done in this function

Private final Charsequence Getsmalltime () {Context context = GetContext (); Boolean is24 = Dateformat.is24hourformat ( context); LocaleData d = localedata.get (Context.getresources (). GetConfiguration (). locale); final char MAGIC1 = ' \uef00 '; final Char MAGIC2 = ' \uef01 '; SimpleDateFormat SDF; String format = Is24? D.timeformat24:d.timeformat12;if (!format.equals (mclockformatstring)) {/* * Search for an unquoted ' a ' in the format str ING, so we can add * dummy characters around it to let us find it again after * formatting and change its size. */if (Am_pm_style! = am_pm_style_normal) {int a = -1;boolean quoted = false;for (int i = 0; i < format.length (); i++) { char C = Format.charat (i); if (c = = ' \ ') {quoted =!quoted;} if (!quoted && c = = ' A ') {a = I;break;}} if (a >= 0) {//Move a back so any whitespace before am/pm are also in the//alternate size.final int b = A;while (a) ; 0&& Character.iswhitespace (Format.charat (A-1))) {a--;} format = format.substring (0, a) + magic1+Format.substring (A, B) + "a" + magic2+ format.substring (b + 1);}} Mclockformat = SDF = new SimpleDateFormat (format); mclockformatstring = format;} else {SDF = Mclockformat;} String result = Sdf.format (Mcalendar.gettime ()); if (am_pm_style! = am_pm_style_normal) {int magic1 = Result.indexof ( MAGIC1), int magic2 = Result.indexof (MAGIC2), if (magic1 >= 0 && magic2 > Magic1) {spannablestringbuilder form atted = new Spannablestringbuilder (result), if (Am_pm_style = = Am_pm_style_gone) {formatted.delete (Magic1, Magic2 + 1);} E LSE {if (Am_pm_style = = Am_pm_style_small) {Characterstyle STYLE = new Relativesizespan (0.7f); Formatted.setspan (STYLE, Magic1, magic2,spannable.span_exclusive_inclusive);} Formatted.delete (Magic2, Magic2 + 1); Formatted.delete (Magic1, Magic1 + 1);} return formatted;}} return result;}

Clock display of Android4.4 systemui analysis