Question

我在Android 8.1 API 27上获得了Toast：

包“my_package_name”的开发人员警告无法在...上发布通知。

Logcat包含下一个字符串：

通知：对于其他操作，不推荐使用流类型   而不是音量控制

W / Notification：请参阅setSound（）的文档以了解要使用的内容   而是使用android.media.AudioAttributes来限定你的播放   用例

E / NotificationService：找不到pkg = my_package_name
的频道

Toast和Logcat中的完整信息可以帮助解决此问题。

Answer 1

如果你得到这个错误，应该注意2个项目并且他们订购：

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

NotificationManager notifManager和NotificationChannel mChannel只创建一次。

通知需要设置者：

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的回答是有效的，但我想避免弃用Builder并遵循FireBase Quickstart Project。我刚刚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

修改他们从示例中删除了通道存在检查我不知道为什么。

Answer 3

我已设置了频道ID，但仍未显示通知。

最后我发现我的问题是没有调用“setContentText（）”方法。

@Andy Sander提到“必需的制定者”真的帮助了我！

此处是Android 8 Oreo API 26及更高版本上的通知所需的设置器：

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

Answer 4

也不要忘记将channel_id绑定到通知构建器。绑定后，我的问题消失了。

notificationBuilder.setChannelId(channelId)

或

NotificationCompat.Builder(Context context, String channelId)

在Android 8.1 API 27上，通知不会显示

4 个答案: