我没有看到任何关于如何将 NotificationCompat 与 Android O 的 Notification Channels 一起使用的信息
我确实看到了一个采用 channelId 的新构造函数，但是如何获取 Compat 通知并在 NotificationChannel 中使用它，因为 createNotificationChannel 采用 NotificationChannel 对象
【问题讨论】：
标签： android android-notifications
仅当 API >= 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);
}
然后只需使用：
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, "default");
因此，您的通知适用于 API 26（带通道）和更低版本（不带）。
【讨论】：
setChannelId 并且构造函数也接受了它。 developer.android.com/reference/android/support/v4/app/…
声明通知管理器：
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";
通知生成器
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);
【讨论】：
NotificationChannel 实际上将多个通知分组到频道中。它基本上为用户提供了对通知行为的更多控制。您可以在Working with Notification Channel | With Example
阅读有关通知通道及其实现的更多信息通知通道仅适用于 Android Oreo。
//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);
}
请注意，传递给构造函数的通道 ID 充当该通知通道的唯一标识符。现在创建如下所示的通知
// Creating the Channel
NotificationManager notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
notificationManager.createNotificationChannel(notificationChannel);
要向该频道添加任何通知，只需传递频道 ID，如下所示
//We pass the unique channel id as the second parameter in the constructor
NotificationCompat.Builder notificationCompatBuilder=new NotificationCompat.Builder(this,NOTIFICATION_CHANNEL_ID);
//Title for your notification
notificationCompatBuilder.setContentTitle("This is title");
//Subtext for your notification
notificationCompatBuilder.setContentText("This is subtext");
//Small Icon for your notificatiom
notificationCompatBuilder.setSmallIcon(R.id.icon);
//Large Icon for your notification
notificationCompatBuilder.setLargeIcon( BitmapFactory.decodeResource(getResources(),R.id.icon));
notificationManager.notify( NOTIFICATION_ID,notificationCompatBuilder.build());
【讨论】：
如果您完成了所有工作但没有得到任何结果，请小心。在某些设备上，您必须设置通知priority。
final NotificationCompat.Builder mBuilder = new
NotificationCompat.Builder(mContext, "default")
.setPriority(Notification.PRIORITY_MAX);
【讨论】：
我知道这个答案迟了，但迟到总比不做好！
我刚刚发布了notification-channel-compat 库，它提供了可追溯到 OS 4.0 的通知通道支持。由于开发人员无论如何都必须针对 Channels 进行设计，因此他们现在可以在所有设备上使用 Channels 的优势，而不必为旧设备单独设计。
该库使用 OS 8.0+ 设备的内置通道类，并为旧设备模仿它。只需使用我们的NotificationChannelCompat、NotificationChannelGroupCompat 和NotificationChannelManagerHelper 类，并添加一行代码。您可以在github 看到更多信息。请测试它并让我知道任何issues。
谢谢，
抄写员
【讨论】：