android 监听时钟变化,Android4.4 SystemUI分析之Clock时钟显示
SystemUI上的時間顯示只要就在/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java類上
效果圖
這個類也很簡單，監聽處理廣播
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (!mAttached) {
mAttached = true;
IntentFilter 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 do these after registering the receiver since the
// receiver always runs
// in the main thread, therefore the receiver can't run before this
// method returns.
// The time zone may have changed while the receiver wasn't registered,
// so update the Time
mCalendar = Calendar.getInstance(TimeZone.getDefault());
// Make sure we update to the current time
updateClock();
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (mAttached) {
getContext().unregisterReceiver(mIntentReceiver);
mAttached = false;
}
}在廣播中去更新時間和監聽語言是否有改變
private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
@Override
public 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();
}
};在設置中可以改變時間顯示是以12小時還是24小時
時間的格式合成都是在這個函數中完成
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 string, 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 is 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 formatted = new SpannableStringBuilder(
result);
if (AM_PM_STYLE == AM_PM_STYLE_GONE) {
formatted.delete(magic1, magic2 + 1);
} else {
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;
}
總結
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