如何在重复通知Android中显示不同的文本

Question

我在viewModel(watchListFragment(中有一个方法getRandomWordForNotification，它从数据库中返回随机单词。我想在每日通知中显示返回的单词及其翻译。是否有任何方法可以将参数传递给AlarmReceiver？或者，我如何将返回的单词传递到通知中，并在每日巴氏杀菌时更新它？

调用视图模型的片段：

@AndroidEntryPoint
class ListFragment : Fragment() {
private var pendingIntent: PendingIntent? = null
private var alarmManager: AlarmManager? = null
private val calendar = Calendar.getInstance()
private var _binding: FragmentListBinding? = null
private val binding get() = _binding!!
private val viewModel: DictionaryViewModel by activityViewModels()
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
_binding = FragmentListBinding.inflate(inflater, container, false)
val view = binding.root
createNotificationChannel()
setAlarm()
// viewModel.getRandomWordForNotification()
return view
}
override fun onDestroyView() {
_binding = null
super.onDestroyView()
}
private fun createNotificationChannel(){
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.O){
val name: CharSequence = "ReminderChannel"
val description = "Channel For Alarm Manager"
val importance = NotificationManager.IMPORTANCE_HIGH
val channel = NotificationChannel("channelID", name, importance)
channel.description = description
val notificationManager = context?.getSystemService(NotificationManager::class.java)
notificationManager?.createNotificationChannel(channel)
}
}
private fun setAlarm(){
alarmManager = context?.getSystemService(ALARM_SERVICE) as AlarmManager
val intent = Intent(context, AlarmReceiver::class.java)
pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0)
calendar[Calendar.HOUR_OF_DAY] = HOUR_FOR_NOTIFICATION
calendar[Calendar.MINUTE] = 0
calendar[Calendar.SECOND] = 0
calendar[Calendar.MILLISECOND] = 0
alarmManager!!.setRepeating(
AlarmManager.RTC_WAKEUP,
calendar.timeInMillis,
AlarmManager.INTERVAL_DAY,
pendingIntent
)
}
}

用于通知的BroadcastReceiver

class AlarmReceiver(): BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
val i = Intent(context, ListFragment::class.java)
intent!!.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK // ?
val pendingIntent = PendingIntent.getActivity(context, 0, i, 0)
val notification = NotificationCompat.Builder(context!!, "channelID")
.setSmallIcon(R.drawable.ic_add_notification)
.setContentTitle("Daily Reminder")
.setContentText("Word - Translation")
.setAutoCancel(true)
.setDefaults(NotificationCompat.DEFAULT_ALL)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setContentIntent(pendingIntent)
.build()
val notificationManager = NotificationManagerCompat.from(context)
notificationManager.notify(123, notification)
}
}

Answer 1

需要注意的是，当视图处于活动状态时，将调用viewModel和方法getRandomWordForNotification()。在你的情况下，当你的应用程序处于后台/被杀时，这无助于你获得一个随机单词。

您应该修改您的AlarmReceiver以启动Service，在那里您将调用您的存储库，获取新的随机单词并构造通知。

class AlarmReceiver(): BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
val service = Intent(context, MyRandomWordService::class.java)
ContextCompat.startForegroundService(context, serviceIntent);
}
}

class MyRandomWordService(name: String = "MyRandomWordService"): IntentService(name) {
override fun onHandleIntent(intent: Intent?) {
val notification = NotificationCompat.Builder(this.applicationContext, "channelID")
.setSmallIcon(R.drawable.ic_add_notification)
.setContentTitle("Daily Reminder")
.setContentText(getRandomWordForNotification())
.setAutoCancel(true)
.setDefaults(NotificationCompat.DEFAULT_ALL)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setContentIntent(pendingIntent)
.build()
val notificationManager = NotificationManagerCompat.from(context)
notificationManager.notify(123, notification)
}
fun getRandomWordForNotification(): String {
// your code for getting the words
}
}

除此之外，请在AndroidManifest文件中注册该服务。

<application ...>
<service android:name=".MyRandomWordService"
</service>
</application>

一些免责声明：

• IntentService在API 30级中已被弃用。

• AlarmManager通常被WorkManager取代：https://developer.android.com/reference/androidx/work/WorkManager和https://developer.android.com/topic/libraries/architecture/workmanager