Android开发：解决Android 8.0 的Notification不显示问题

Notification在android 8.0以上设置时，需要设置渠道信息才能够正常显示通知，在这里和大家做个分享：

String id = "channel_001";
String name = "name";
NotificationManager notificationManager = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
Notification notification = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    NotificationChannel mChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_LOW);
    notificationManager.createNotificationChannel(mChannel);
    notification = new Notification.Builder(context)
            .setChannelId(id)
            .setContentTitle("活动")
            .setContentText("您有一项新活动")
            .setSmallIcon(R.drawable.app_logo).build();
} else {
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)
            .setContentTitle("活动")
            .setContentText("您有一项新活动")
            .setSmallIcon(R.drawable.app_logo)
            .setOngoing(true)
            .setChannelId(id);//无效
    notification = notificationBuilder.build();
}
notificationManager.notify(1, notification);