On Android 8.1 API 27 通知不显示

Question

我在 Android 8.1 API 27:

得到吐司

Developer warning for package "my_package_name"
Failed to post notification on ...

Logcat 包括下一个字符串：

Notification: Use of stream types is deprecated for operations other than volume control

W/Notification: See the documentation of setSound() for what to use instead with android.media.AudioAttributes to qualify your playback use case

E/NotificationService: No Channel found for pkg=my_package_name

Toast 和 Logcat 中的完整信息可以帮助本地化此问题。

Answer 1

如果出现此错误，应注意 2 项并按顺序排列：

NotificationChannel mChannel = new NotificationChannel(id, name, importance);
builder = new NotificationCompat.Builder(context, id);

同时 NotificationManager notifManager 和 NotificationChannel mChannel 只创建一次。

通知需要设置器：

builder.setContentTitle() // 必需
.setSmallIcon() // 必需
.setContentText() // 必需

参见示例：

private NotificationManager notifManager;
public void createNotification(String aMessage, Context context) {
    final int NOTIFY_ID = 0; // ID of notification
    String id = context.getString(R.string.default_notification_channel_id); // default_channel_id
    String title = context.getString(R.string.default_notification_channel_title); // Default Channel
    Intent intent;
    PendingIntent pendingIntent;
    NotificationCompat.Builder builder;
    if (notifManager == null) {
        notifManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        int importance = NotificationManager.IMPORTANCE_HIGH;
        NotificationChannel mChannel = notifManager.getNotificationChannel(id);
        if (mChannel == null) {
            mChannel = new NotificationChannel(id, title, importance);
            mChannel.enableVibration(true);
            mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
            notifManager.createNotificationChannel(mChannel);
        }
        builder = new NotificationCompat.Builder(context, id);
        intent = new Intent(context, MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
        builder.setContentTitle(aMessage)                            // required
               .setSmallIcon(android.R.drawable.ic_popup_reminder)   // required
               .setContentText(context.getString(R.string.app_name)) // required
               .setDefaults(Notification.DEFAULT_ALL)
               .setAutoCancel(true)
               .setContentIntent(pendingIntent)
               .setTicker(aMessage)
               .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
    }
    else {
        builder = new NotificationCompat.Builder(context, id);
        intent = new Intent(context, MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
        builder.setContentTitle(aMessage)                            // required
               .setSmallIcon(android.R.drawable.ic_popup_reminder)   // required
               .setContentText(context.getString(R.string.app_name)) // required
               .setDefaults(Notification.DEFAULT_ALL)
               .setAutoCancel(true)
               .setContentIntent(pendingIntent)
               .setTicker(aMessage)
               .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
               .setPriority(Notification.PRIORITY_HIGH);
    }
    Notification notification = builder.build();
    notifManager.notify(NOTIFY_ID, notification);
}

Answer 2

Andy 的回答有效，但我想避免弃用 Builder 并遵循 FireBase Quickstart Project。我只是在经理通知之前添加了代码。

String channelId = "default_channel_id";
String channelDescription = "Default Channel";
// Since android Oreo notification channel is needed.
//Check if notification channel exists and if not create one
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
    NotificationChannel notificationChannel = notificationManager.getNotificationChannel(channelId);
    if (notificationChannel == null) {
        int importance = NotificationManager.IMPORTANCE_HIGH; //Set the importance level
        notificationChannel = new NotificationChannel(channelId, channelDescription, importance);
        notificationChannel.setLightColor(Color.GREEN); //Set if it is necesssary
        notificationChannel.enableVibration(true); //Set if it is necesssary
        notificationManager.createNotificationChannel(notificationChannel);
    }
}

//notificationManager.notify as usual

编辑： 他们从示例中删除了频道存在检查，我不确定为什么。

Answer 3

我已经设置了频道ID，但是还是没有显示通知。

最后我发现我的问题是没有调用 "setContentText()" 方法。

@Andy Sander提到"required setters"！

真的对我很有帮助

Android8 Oreo API26 及更高版本上的通知需要设置器：

builder.setContentTitle() // required
.setSmallIcon() // required
.setContentText() // required
.setChannelId(id) // required for deprecated in API level >= 26 constructor .Builder(this)

Answer 4

另外不要忘记将您的 channel_id 绑定到您的通知生成器。绑定后，我的问题解决了。

notificationBuilder.setChannelId(channelId)

或

NotificationCompat.Builder(Context context, String channelId)

On Android 8.1 API 27 通知不显示

On Android 8.1 API 27 notification does not display

notifications

android

android-notifications

android-8.0-oreo