NotificationCompat与API 26

Question

我没有看到任何有关如何将NotificationCompat与Android O Notification Channels

一起使用的信息

我确实看到一个新的构造函数，它接受channelId但是如何获取Compat通知并在NotificationChannel中使用它，因为createNotificationChannel需要NotificationChannel个对象

Answer 1

仅在API＆gt; = 26

时创建NotificationChannel

public void initChannels(Context context) {
    if (Build.VERSION.SDK_INT < 26) {
        return;
    }
    NotificationManager notificationManager =
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationChannel channel = new NotificationChannel("default",
                                                          "Channel name",
                                                          NotificationManager.IMPORTANCE_DEFAULT);
    channel.setDescription("Channel description");
    notificationManager.createNotificationChannel(channel);
}

然后使用：

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, "default");

因此，您的通知适用于API 26（带通道）和低于（不带）。

Answer 2

声明通知管理员：

   final NotificationManager mNotific=            
   (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

    CharSequence name="Ragav";
    String desc="this is notific";
    int imp=NotificationManager.IMPORTANCE_HIGH;
    final String ChannelID="my_channel_01";

通知渠道

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) 
    {
      NotificationChannel mChannel = new NotificationChannel(ChannelID, name, 
     imp);
            mChannel.setDescription(desc);
            mChannel.setLightColor(Color.CYAN);
            mChannel.canShowBadge();
            mChannel.setShowBadge(true);
            mNotific.createNotificationChannel(mChannel);
        }

    final int ncode=101;

    String Body="This is testing notific";

通知构建器

        Notification n= new Notification.Builder(this,ChannelID)
                .setContentTitle(getPackageName())
                .setContentText(Body)
                .setBadgeIconType(R.mipmap.ic_launcher)
                .setNumber(5)
                .setSmallIcon(R.mipmap.ic_launcher_round)
                .setAutoCancel(true)
                .build();

NotificationManager通知用户：

            mNotific.notify(ncode, n);

Answer 3

NotificationChannel实际上将多个通知分组到频道中。它基本上可以更好地控制用户的通知行为。您可以在Working with Notification Channel | With Example

了解有关通知渠道及其实施的更多信息

通知频道仅适用于Android Oreo。

UserContext.User

请注意，传递给构造函数的Channel ID充当该Notification Channel的唯一标识符。现在创建通知，如下所示

 //Notification channel should only be created for devices running Android 26
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

  NotificationChannel notificationChannel = new NotificationChannel("unique_channel_id","channel_name",NotificationManager.IMPORTANCE_DEFAULT);

  //Boolean value to set if lights are enabled for Notifications from this Channel
  notificationChannel.enableLights(true);

  //Boolean value to set if vibration is enabled for Notifications from this Channel
  notificationChannel.enableVibration(true);

  //Sets the color of Notification Light
  notificationChannel.setLightColor(Color.GREEN);

  //Set the vibration pattern for notifications. Pattern is in milliseconds with the format {delay,play,sleep,play,sleep...}
  notificationChannel.setVibrationPattern(new long[]{500,500,500,500,500});

  //Sets whether notifications from these Channel should be visible on Lockscreen or not
  notificationChannel.setLockscreenVisibility( Notification.VISIBILITY_PUBLIC);
}  

要向此频道添加任何通知，只需传递频道ID，如下所示

// Creating the Channel
NotificationManager notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
notificationManager.createNotificationChannel(notificationChannel);

Answer 4

如果你做了所有工作并且没有得到任何结果，请小心。在某些设备上，您必须设置通知优先级。

   final NotificationCompat.Builder mBuilder = new 
    NotificationCompat.Builder(mContext, "default")
    .setPriority(Notification.PRIORITY_MAX);

Answer 5

我知道这个答案来晚了，但是迟到总比不来好！
我刚刚发布了notification-channel-compat库，该库提供了从OS 4.0开始的Notification Channel支持。由于开发人员无论如何都必须针对通道进行设计，因此他们现在可以将通道的优势用于所有设备，而不必为较旧的设备单独设计。
该库对OS 8.0+设备使用内置的通道类，对于较旧的设备则模拟它。它所要做的就是使用我们的NotificationChannelCompat，NotificationChannelGroupCompat和NotificationChannelManagerHelper类，并添加一行代码。您可以在github上看到更多内容。请对其进行测试，并让我知道任何issues。
谢谢
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