Firebase:如何在 Android 应用程序中设置默认通知渠道?

Firebase: How to set default notification channel in Android app?

如何为应用程序在后台时出现的通知消息设置默认通知渠道?默认情况下,这些消息使用 "Miscellaneous" 频道。

如您所见 here in the official docs,您需要在应用程序组件内的 AndroidManifest.xml 中添加以下元数据元素:

<meta-data
    android:name="com.google.firebase.messaging.default_notification_channel_id"
    android:value="@string/default_notification_channel_id"/>

当通知消息没有指定的频道,或者提供的频道尚未被应用程序创建时,将使用此默认频道。

你需要添加 Cordova config.xml

<widget 
... 
xmlns:android="http://schemas.android.com/apk/res/android" 
...>



 <platform name="android">
    <config-file target="AndroidManifest.xml" parent="application" mode="merge">
      <meta-data android:name="com.google.firebase.messaging.default_notification_channel_id" android:value="@string/default_notification_channel_id"/>
    </config-file>
    <config-file target="res/values/strings.xml" parent="/*">
      <string name="default_notification_channel_id">urgent_alert</string>
    </config-file>
</platform>

您需要使用 NotificationManager CreateNotificationChannel.

注册频道

此示例在 Xamarin 中使用 c#,但广泛适用于其他地方

private void ConfigureNotificationChannel()
{
    if (Build.VERSION.SdkInt < BuildVersionCodes.O)
    {
        // Notification channels are new in API 26 (and not a part of the
        // support library). There is no need to create a notification
        // channel on older versions of Android.
        return;
    }

    var channelId = Resources.GetString(Resource.String.default_notification_channel_id);
    var channelName = "Urgent";
    var importance = NotificationImportance.High;

    //This is the default channel and also appears in the manifest
    var chan = new NotificationChannel(channelId, channelName, importance);

    chan.EnableVibration(true);
    chan.LockscreenVisibility = NotificationVisibility.Public;

    var notificationManager = (NotificationManager)GetSystemService(NotificationService);
    notificationManager.CreateNotificationChannel(chan);

}

这个频道应该是唯一的,例如com.mycompany.myapp.urgent

然后在 AndroidManifest.xml

中的 application 标签内添加对字符串的引用
<application android:label="MyApp" android:icon="@mipmap/icon">
    <meta-data android:name="com.google.firebase.messaging.default_notification_channel_id" android:value="@string/default_notification_channel_id" />
</application>

最后,在strings.xml

中设置字符串
<?xml version="1.0" encoding="UTF-8" ?>
<resources>
    <string name="default_notification_channel_id">com.mycompany.myapp.urgent</string>
</resources>