Question

我试图在经过一段时间后发出通知。为了实现这一点，我有一个继承自BroadCast接收器的AlarmReceiver类，适用于运行API 23的设备。它不能在我当前运行API 27的模拟器上工作。任何线索我都会这样做做错了？

class AlarmReceiver : BroadcastReceiver() {
companion object {
    val PRIMARY_CHANNEL = "dj"
}

override fun onReceive(context: Context, intent: Intent) {

    val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    val notificationIntent = Intent(context, NotificationActivity::class.java)

    val stackBuilder = TaskStackBuilder.create(context)
    stackBuilder.addParentStack(NotificationActivity::class.java)
    stackBuilder.addNextIntent(notificationIntent)

    val pendingIntent = stackBuilder.getPendingIntent(100, PendingIntent.FLAG_UPDATE_CURRENT)

    if (android.os.Build.VERSION_CODES.O <= android.os.Build.VERSION.SDK_INT){
        //I create the notification channel on the next line, but it doesn't seem to work
        val notificationChannel = NotificationChannel(PRIMARY_CHANNEL,
                "DailyJokes", NotificationManager.IMPORTANCE_DEFAULT)
        notificationChannel.lightColor = Color.GREEN
        notificationChannel.lockscreenVisibility = Notification.VISIBILITY_PRIVATE
        notificationManager.createNotificationChannel(notificationChannel)

        val notification = Notification.Builder(context, PRIMARY_CHANNEL)
                .setContentIntent(pendingIntent)
                .setChannelId("dj")
                .setContentText("KDW")
                .setSmallIcon(R.mipmap.ic_launcher_round)
                .setContentTitle("CCC")
                .build()
        notificationManager.notify(1,notification)    

    } else {
        var builder = NotificationCompat.Builder(context, "dj")
    val sound = Uri.parse("android.resource://" + context.packageName + "/" + "raw/drumroll")
    builder = builder
            .setSmallIcon(R.mipmap.ic_launcher_round)
            .setColor(Color.BLUE)
            .setContentTitle("Content Title")
            .setTicker("TICKER Text")
            .setContentText("KDW setContentText")
            .setAutoCancel(true)
            .setContentIntent(pendingIntent)
            .setChannelId("dj")
            .setSound(sound)

    notificationManager.notify(1, builder!!.build())
    }

  }
}

这里是触发通知的代码，这里有什么？

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_notification)



 val alarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager

    val notificationIntent = Intent("android.media.action.DISPLAY_NOTIFICATION")


    notificationIntent.addCategory("android.intent.category.DEFAULT")

    val broadcast = getBroadcast(this, 100, notificationIntent, FLAG_UPDATE_CURRENT)

    val cal = Calendar.getInstance()
    cal.add(Calendar.SECOND, 5)
    alarmManager.set(AlarmManager.RTC_WAKEUP, cal.timeInMillis, broadcast)

}
}

我的Manifest中也有一个接收器：

<receiver android:name=".AlarmReceiver">
        <intent-filter>
            <action android:name="android.media.action.DISPLAY_NOTIFICATION" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

即使有了这一切，这个bug仍然潜伏着。我是Kotlin的新手，今天我开始做了一个星期。我的快速经历为我做好了准备，但我似乎无法抓住通知：/

Answer 1

从我的代码中可以看出，您需要在Manifest或上下文中注册接收器。

https://developer.android.com/guide/components/broadcasts.html

Answer 2

您的频道是否已创建？你的比较是在错误的方向 - ＆gt;

android.os.Build.VERSION_CODES.O <= android.os.Build.VERSION.SDK_INT应该>=而不是

并且只有通道创建需要防范O，而不是通知创建。

如何创建适用于所有Android设备的时间触发通知

2 个答案: