我正在编写一个简单的应用程序，该应用程序最多可以设置8个随机，重复的警报，发送通知，然后在用户点击通知时生成报价。当应用程序运行时，这一切似乎都可以正常运行，但是当该应用程序从最近的应用程序中滑开或强制关闭时，通知将不起作用。
最近几天以来，我一直在研究自己的研究，但找不到最新的解决方案或解决了我的问题。我见过的最常见的事情是使用onReceive来设置服务，但我的阅读显示给我看，这不再适用于Oreo，并且已过时。我还看到了一些有关前台服务的信息，但我实际上并不是希望持久性通知困扰用户。
我也看到有人说要在onDestroy上做一些工作，但这对我也没有用。我发现的很多东西都说这种行为是“预期行为”，因为系统会假设如果某个应用程序被刷掉，用户将不再希望它做任何事情。我不希望这种情况发生，并且必须采取某种措施，因为其他应用程序的提醒和通知都可以通过。
任何帮助将不胜感激，我为此苦苦挣扎了很长时间。我将在下面发布用于设置警报的代码，以及用于设置通知频道和BroadcastReceiver类的代码。
顺便说一下，我的测试设备是搭载Android 9的Pixel 2XL。
//method to save preferences when the user clicks "SAVE"
private fun saveData() {
if (NOTIFICATIONS_PER_DAY > 0) {
setAlarms()
} else {
clearAlarms() //clearing if the user is removing notifications
}
val sharedPreferences = activity!!.getSharedPreferences(SHARED_PREFS, MODE_PRIVATE)
val editor = sharedPreferences.edit()
editor.putString(THEME_PREF, THEME_SELECTED)
editor.putInt(NOTS_PREF, NOTIFICATIONS_PER_DAY)
editor.apply()
Toast.makeText(context, "Settings saved", Toast.LENGTH_SHORT).show()
}//saveData method
//method to set repeating notification alarms (random times)
private fun setAlarms() {
//clearing any previously saved alarms to prevent tons of extra
clearAlarms()
calList.clear()
var hour: Int
var minute: Int
for (i in 0 until (NOTIFICATIONS_PER_DAY)) {
val hourRand = (0..23).random()
val minuteRand = (0..59).random()
hour = hourRand
minute = minuteRand
val cal = Calendar.getInstance()
cal.set(Calendar.HOUR_OF_DAY, hour)
cal.set(Calendar.MINUTE, minute)
cal.set(Calendar.SECOND, 0)
calList.add(cal)
}//for
var i = 0
for (cal in calList) {
val alarmManager = context!!.getSystemService(Context.ALARM_SERVICE) as AlarmManager
val intent = Intent(context, AlertReceiver::class.java)
val pendingIntent = PendingIntent.getBroadcast(context, i, intent, 0)
alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.timeInMillis, AlarmManager.INTERVAL_DAY, pendingIntent)
println(i)
i++
}//for
}//setAlarms method
class BetterDays : Application() {
override fun onCreate() {
super.onCreate()
createNotificationChannels()
}
private fun createNotificationChannels() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val channel1 = NotificationChannel(CHANNEL_1_ID, "Quote Channel", NotificationManager.IMPORTANCE_DEFAULT).apply { description = "New quotes notification" }
channel1.enableLights(true)
channel1.enableVibration(true)
//channel1.description = "New quotes notification"
/* val channel2 = NotificationChannel(CHANNEL_2_ID, "New Quote!", NotificationManager.IMPORTANCE_DEFAULT)
channel2.enableLights(true)
channel2.enableVibration(true)
channel2.description = "New quotes notification" */
val manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
manager.createNotificationChannel(channel1)
//manager.createNotificationChannel(channel2)
}
}//createNotificationChannels method
companion object {
val CHANNEL_1_ID = "quotes notification"
val CHANNEL_2_ID = "quotes notification 2"
}
}
class AlertReceiver : BroadcastReceiver() {
private var notificationManager: NotificationManagerCompat? = null
private var theContext: Context? = null
override fun onReceive(context: Context, intent: Intent) {
notificationManager = NotificationManagerCompat.from(context)
theContext = context
sendOnChannel1()
}//onReceive method
private fun sendOnChannel1() {
val title = "New Quote Available"
val message = "Come check it out!"
var index: Int = 0
if(quotesList.size != 0) {
index = Random.nextInt(quotesList.size)
}//if
quoteText = quotesList[index]
speakerText = speakersList[index]
quoteTextView?.text = quotesList[index]
speakerTextView?.text = speakersList[index]
val intent = Intent(theContext!!, MainActivity::class.java)
intent.putExtra("From", "quotesFragment")
val pendingIntent: PendingIntent = PendingIntent.getActivity(theContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
val notification = NotificationCompat.Builder(theContext!!, CHANNEL_1_ID)
.setSmallIcon(R.drawable.ic_quotes)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.setContentIntent(pendingIntent)
.build()
val id = createID()
notificationManager!!.notify(id, notification)
}//sendOnChannel1 method
/* //for future functionality
fun sendOnChannel2() {
val title = "Title"
val message = "Message"
val notification = NotificationCompat.Builder(theContext!!, CHANNEL_2_ID)
.setSmallIcon(R.drawable.ic_quotes)
.setContentTitle(title)
.setContentText(message)
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.build()
notificationManager!!.notify(2, notification)
}//sendOnChannel2 method*/
//method to generate a unique ID
private fun createID(): Int{
val now = Date()
val id = Integer.parseInt(SimpleDateFormat("ddHHmmss", Locale.US).format(now))
return id
}//createID method
}//AlertReceiver class
答案 0 :(得分：-1)
某些中文设备带有自己修改过的android系统，因此当从最近的应用程序托盘中刷过应用程序时，您的应用程序将被终止（类似于“强制停止”）。由于这个原因，每项任务都会在后台运行，例如服务，因此乔布斯会被该应用杀死。即使是高优先级FCM也看不到中文ROM中的日光。
您可以在这里阅读：https://medium.com/mindorks/enable-background-services-in-chinese-roms-32e73dfba1a6
也许可以提供帮助;）