android - 广播接收器没有收到额外的东西

Question

初始化后，我的 View 模型会创建一个警报。它设置为在应用程序启动后 10 秒响铃。警报管理器收到一个 pendingIntent。 pendingIntent 接收一个 Intent 。 Intent 是一个广播接收器。Intent bundle 含使我遇到问题的额外内容。以下是我的 View 模型的相关代码:

MainActivityViewModel.kt

    init {
        val intent =
            Intent(app, TimetableAlarmReceiver::class.java).also {
                val alarmMessage =
                    "message"

                it.putExtra("message", alarmMessage)
                Timber.i("The extra message is $alarmMessage")

                it.putExtra("dayOfWeek", getTodayEnumDay())
                Timber.i("The extra dayOfWeek is ${getTodayEnumDay()}")
            }
        Timber.i("The intent is $intent")

        val pendingIntent = PendingIntent.getBroadcast(
            app,
            0,
            intent,
            PendingIntent.FLAG_UPDATE_CURRENT
        )
        val alarmManager = app.getSystemService(Context.ALARM_SERVICE) as AlarmManager

        alarmManager.setExact(
            AlarmManager.RTC_WAKEUP,
            System.currentTimeMillis().plus(10000L),
            pendingIntent
        )
    }

广播接收器未检测到任何额外内容:

TimetableAlarmReceiver.kt

    override fun onReceive(context: Context, intent: Intent?) {
        Timber.i("The receiver has been called")
        val notificationManager = ContextCompat.getSystemService(
            context,
            NotificationManager::class.java
        ) as NotificationManager

        if(intent!=null){
            Timber.i("The extras are:${intent.extras}")
            val message = intent.getStringExtra("message")
            Timber.i("The extra message is $message")
            val dayOfWeek = intent.getSerializableExtra("dayOfWeek") as DayOfWeek?
            Timber.i("The extra dayOfWeek is $dayOfWeek")
        }

日志的讽刺之处:

MainActivityViewModel.kt 日志

2021-04-14 17:42:38.684 5492-5492/com.example.android.mycampusapp I/MainActivityViewModel: The extra message is message
2021-04-14 17:42:38.687 5492-5492/com.example.android.mycampusapp I/MainActivityViewModel: The extra dayOfWeek is WEDNESDAY
2021-04-14 17:42:38.687 5492-5492/com.example.android.mycampusapp I/MainActivityViewModel: The intent is Intent { cmp=com.example.android.mycampusapp/.timetable.receiver.TimetableAlarmReceiver (has extras) }

TimetableAlarmReceiver.kt 日志:

2021-04-14 17:53:38.884 5814-5814/com.example.android.mycampusapp I/TimetableAlarmReceiver: The receiver has been called
2021-04-14 17:53:38.885 5814-5814/com.example.android.mycampusapp I/TimetableAlarmReceiver: The extras are:Bundle[EMPTY_PARCEL]
2021-04-14 17:53:38.886 5814-5814/com.example.android.mycampusapp I/TimetableAlarmReceiver: The extra message is null
2021-04-14 17:53:38.886 5814-5814/com.example.android.mycampusapp I/TimetableAlarmReceiver: The extra dayOfWeek is null

我在这里尝试了各种关于堆栈溢出的解决方案，其中涉及已成功调用的接收器。其中一些涉及更改未决 Intent 标志，但这在这里没有帮助。我使用的是正确的标志 PendingIntent.FLAG_UPDATE_CURRENT。在任何情况下，将标志更改为 Intent.FILL_IN_DATA 或 PendingIntent.FLAG_CANCEL_CURRENT 都不起作用。

Answer 1

啊。您不能将自定义可序列化对象作为“额外”放入发送到 AlarmManager 的 Intent 中。您只能将已知类型放在那里。如果您需要自定义类型，则需要将自定义对象序列化为字节数组，并将其作为“额外”添加到您的 Intent 中。