为了检测日期的变化&＃xff0c;您需要注册以下操作&＃xff1a;
这是我写的一个解决方案&＃xff0c;所以你要做的就是扩展类&＃xff0c;并在Activity / Fragment上注册和取消注册&＃xff1a;abstract class DateChangedBroadcastReceiver : BroadcastReceiver() {
private var curDate &＃61; LocalDate.now()
/**called when the receiver detected the date has changed. You should still check it yourself, because you might already be synced with the new date*/
abstract fun onDateChanged(previousDate: LocalDate, newDate: LocalDate)
&＃64;Suppress("MemberVisibilityCanBePrivate")
fun register(context: Context, date: LocalDate) {
curDate &＃61; date
val filter &＃61; IntentFilter()
filter.addAction(Intent.ACTION_TIME_CHANGED)
filter.addAction(Intent.ACTION_DATE_CHANGED)
filter.addAction(Intent.ACTION_TIMEZONE_CHANGED)
context.registerReceiver(this, filter)
val newDate &＃61; LocalDate.now()
if (newDate !&＃61; curDate) {
curDate &＃61; newDate
onDateChanged(date, newDate)
}
}
/**a convenient way to auto-unregister when activity/fragment has stopped. This should be called on the onResume method of the fragment/activity*/
fun registerOnResume(activity: AppCompatActivity, date: LocalDate, fragment: androidx.fragment.app.Fragment? &＃61; null) {
register(activity, date)
val lifecycle &＃61; fragment?.lifecycle ?: activity.lifecycle
lifecycle.addObserver(object : LifecycleObserver {
&＃64;Suppress("unused")
&＃64;OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
fun onPause() {// Log.d("AppLog", "onPause, so unregistering")
lifecycle.removeObserver(this)
activity.unregisterReceiver(this&＃64;DateChangedBroadcastReceiver)
}
})
}
override fun onReceive(context: Context, intent: Intent) {
val newDate &＃61; LocalDate.now()// Log.d("AppLog", "got intent:" &＃43; intent.action &＃43; " curDate:" &＃43; curDate &＃43; " newDate:" &＃43; newDate)
if (newDate !&＃61; curDate) {// Log.d("AppLog", "cur date is different, so posting event")
val previousDate &＃61; curDate
curDate &＃61; newDate
onDateChanged(previousDate, newDate)
}
}}
如果您不能使用LocalDate(因为它使用相对较新的API&＃xff1a;26&＃xff0c;目前在大约21&＃xff05;的设备上使用)&＃xff0c;您可以使用它&＃xff1a;abstract class DateChangedBroadcastReceiver : BroadcastReceiver() {
private var curDate &＃61; Calendar.getInstance()
/**called when the receiver detected the date has changed. You should still check it yourself, because you might already be synced with the new date*/
abstract fun onDateChanged(previousDate: Calendar, newDate: Calendar)
companion object {
fun toString(cal: Calendar): String {
return "${cal.get(Calendar.YEAR)}-${cal.get(Calendar.MONTH)}-${cal.get(Calendar.DAY_OF_MONTH)}"
}
fun resetDate(date: Calendar) {
date.set(Calendar.HOUR_OF_DAY, 0)
date.set(Calendar.MINUTE, 0)
date.set(Calendar.SECOND, 0)
date.set(Calendar.MILLISECOND, 0)
}
fun areOfSameDate(date: Calendar, otherDate: Calendar) &＃61;
date.get(Calendar.DAY_OF_YEAR) &＃61;&＃61; otherDate.get(Calendar.DAY_OF_YEAR) &&
date.get(Calendar.YEAR) &＃61;&＃61; otherDate.get(Calendar.YEAR)
}
&＃64;Suppress("MemberVisibilityCanBePrivate")
fun register(context: Context, date: Calendar) {
curDate &＃61; date.clone() as Calendar
resetDate(curDate)
val filter &＃61; IntentFilter()
filter.addAction(Intent.ACTION_TIME_CHANGED)
filter.addAction(Intent.ACTION_DATE_CHANGED)
filter.addAction(Intent.ACTION_TIMEZONE_CHANGED)
context.registerReceiver(this, filter)
val newDate &＃61; Calendar.getInstance()
resetDate(newDate)
if (!areOfSameDate(newDate, curDate)) {
val previousDate &＃61; curDate.clone() as Calendar
curDate &＃61; newDate
onDateChanged(previousDate, curDate)
}
}
/**a convenient way to auto-unregister when activity/fragment has stopped. This should be called on the onResume method of the fragment/activity*/
fun registerOnResume(activity: AppCompatActivity, date: Calendar, fragment: Fragment? &＃61; null) {
register(activity as Context, date)
val lifecycle &＃61; fragment?.lifecycle ?: activity.lifecycle
lifecycle.addObserver(object : LifecycleObserver {
&＃64;Suppress("unused")
&＃64;OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
fun onPause() {// Log.d("AppLog", "onPause, so unregistering")
lifecycle.removeObserver(this)
activity.unregisterReceiver(this&＃64;DateChangedBroadcastReceiver)
}
})
}
override fun onReceive(context: Context, intent: Intent) {
val newDate &＃61; Calendar.getInstance()
resetDate(newDate)// Log.d("AppLog", "got intent:${intent.action} curDate:${toString(curDate)} newDate:${toString(newDate)}")
if (!areOfSameDate(newDate, curDate)) {// Log.d("AppLog", "cur date is different, so posting event")
val previousDate &＃61; curDate.clone() as Calendar
curDate &＃61; newDate
onDateChanged(previousDate, newDate)
}
}}
用法示例&＃xff1a;class MainActivity : AppCompatActivity() {
var curDate &＃61; Calendar.getInstance()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
override fun onResume() {
super.onResume()
object : DateChangedBroadcastReceiver() {
override fun onDateChanged(previousDate: Calendar, newDate: Calendar) {
Log.d("AppLog", "MainActivity: ${DateChangedBroadcastReceiver.toString(previousDate)} -> ${DateChangedBroadcastReceiver.toString(newDate)}")
curDate &＃61; newDate.clone() as Calendar
//TODO handle date change
}
}.registerOnResume(this, curDate)
}}
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