通知未在 Android 8 上显示答案

【问题标题】：Notification not showing up on Android 8通知未在 Android 8 上显示
【发布时间】：2018-12-23 17:03:59
【问题描述】：

我已阅读有关此问题的大多数问题/答案，但我的通知仍未显示。

我的广播接收器被调用，但没有任何反应。没有错误消息也没有异常。这是我的代码：

public class AlarmReceiver extends BroadcastReceiver {

    private static int notificationId = 0;

    @Override
    public void onReceive(Context context, Intent intent) {
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Intent notificationIntent = new Intent(context, MainActivity.class);
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 101, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        NotificationCompat.Builder mNotifyBuilder = new NotificationCompat.Builder(
                context, "mychannel")
                .setSmallIcon(R.drawable.icon_awake)
                .setContentTitle("MyAlarm")
                .setContentText("Something")
                .setAutoCancel(false)
                .setWhen(System.currentTimeMillis())
                .setContentIntent(pendingIntent);
        notificationManager.notify(notificationId++, mNotifyBuilder.build());
    }

}

【问题讨论】：

标签： android android-intent notifications android-8.0-oreo

【解决方案1】：

我认为您忘记在 Oreo 8.0 上阅读 Google 文档。如果您想在 8.0 上创建通知，您需要使用 NotificationChannel

像这样：

    NotificationChannel channel = null;
    String chanel = "MY_Musixbox";

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        int importance = NotificationManager.IMPORTANCE_LOW;
        channel = new NotificationChannel(chanel, "MusicBox", importance);
        notificationManager.createNotificationChannel(channel);

    }

然后添加您的通知

NotificationCompat.Builder mNotifyBuilder = new NotificationCompat.Builder(
                context, "mychannel")
                .setSmallIcon(R.drawable.icon_awake)
                .setContentTitle("MyAlarm")
                .setContentText("Something")
                 .setChannelId(chanel);
                .setAutoCancel(false)
                .setWhen(System.currentTimeMillis())
                .setContentIntent(pendingIntent);
        notificationManager.notify(notificationId++, mNotifyBuilder.build());

【讨论】：

【解决方案2】：

好的，我会自己回答，以防有人发现：看来您也需要自己手动创建通知通道：

if (Build.VERSION.SDK_INT >= 26) {
            NotificationChannel channel = new NotificationChannel("mychannel",
                    "Channel name",
                    NotificationManager.IMPORTANCE_HIGH);
            channel.setDescription("Channel description");
            notificationManager.createNotificationChannel(channel);
        }

【讨论】：

【解决方案3】：

NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    Intent notificationIntent = new Intent(context, MainActivity.class);
    notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 101, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder mNotifyBuilder = new NotificationCompat.Builder(
            context, "mychannel")
            .setSmallIcon(R.drawable.icon_awake)
            .setContentTitle("MyAlarm")
            .setContentText("Something")
            .setAutoCancel(false)
            .setWhen(System.currentTimeMillis())
            .setChannelId("default_channel")
            .setContentIntent(pendingIntent);
    notificationManager.notify(notificationId++, mNotifyBuilder.build());

试试这个。您必须定义频道 ID。这在 android 8.0 中是强制性的

【讨论】：