好吧，我这么做很管用：

myNotification.defaults = 0;

试试看吧=）

在pre Oreo设备、Oreo和更高版本设备上显示无声音通知

NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

    Intent intent = new Intent(this, AlertDetails.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); 
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

    String CHANNEL_ID = "channel_id";

    // You must create the channel to show the notification on Android 8.0 and higher versions
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        // Set importance to IMPORTANCE_LOW to mute notification sound on Android 8.0 and above
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "name", NotificationManager.IMPORTANCE_LOW);
        notificationManager.createNotificationChannel(channel);
    }

    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this, CHANNEL_ID)
            .setSmallIcon(R.drawable.notification_icon)
            .setContentTitle("My notification")
            .setContentText("Hello World!")
            // You must set the priority to support Android 7.1 and lower
            .setPriority(NotificationCompat.PRIORITY_LOW) // Set priority to PRIORITY_LOW to mute notification sound 
            .setContentIntent(pendingIntent)
            .setAutoCancel(true); 

    notificationManager.notify(
                    1001, // notification id
                    mBuilder.build());

基本上可以这样做，只需启用除声音（Notification.DEFAULT_SOUND）之外的所有其他Notification.defaults。
下面是一个适合您的示例：

myNotification.defaults = 0;
myNotification.defaults |= Notification.DEFAULT_VIBRATE;

以下是您可以选择的所有可用选项：

Notification.DEFAULT_LIGHTS
Notification.DEFAULT_VIBRATE
Notification.DEFAULT_SOUND
Notification.DEFAULT_ALL // This enables all above 3

更新

通知.defaults已过时

在较新版本的Android中，你必须将通知通道的优先级设置为低：

var channel = new NotificationChannel(notificationChannelName, "channel", NotificationManager.IMPORTANCE_LOW);

android“O”〉=，禁用或启用通知的声音您使用两个id用于通知通道。一个用于声音通知，另一个在您要禁用时设置

@RequiresApi(api = Build.VERSION_CODES.O)
    private void createNotificationChannel(Context context, NotificationManager mNotificationManager, boolean playSound) {

    // The user-visible name of the channel.
    CharSequence name = context.getString(R.string.channel_name);

    // The user-visible description of the channel.

    String description = context.getString(R.string.channel_description);
    int importance = NotificationManager.IMPORTANCE_HIGH;
    NotificationChannel mChannel = new NotificationChannel(playSound ? channel_id_sound : channel_id_no_sound, name, importance);

    // Configure the notification channel.
    mChannel.setDescription(description);
    mChannel.enableLights(true);

    // Sets the notification light color for notifications posted to this
    // channel, if the device supports this feature.
    mChannel.setLightColor(Color.RED);
    mChannel.enableVibration(true);
    mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
    if (!playSound)
        mChannel.setSound(null, null);
    mNotificationManager.createNotificationChannel(mChannel);
}

您可以使用此

NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "Channel name", NotificationManager.IMPORTANCE_LOW);
channel.setSound(null, null);

只需将通道声音设置为空