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。本以为很简单，上网查了很多资料都不行，后面决定自己去看Notifacation的源码，终于找到了解决方案，在这里和大家做个分享。废话不多说，直接上代码：
String id = "my_channel_01";
String name="我是渠道名字";
notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification notification = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel mChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_LOW);
Toast.makeText(this, mChannel.toString(), Toast.LENGTH_SHORT).show();
Log.i(TAG, mChannel.toString());
notificationManager.createNotificationChannel(mChannel);
notification = new Notification.Builder(this)
.setChannelId(id)
.setContentTitle("5 new messages")
.setContentText("hahaha")
.setSmallIcon(R.mipmap.ic_launcher).build();
} else {
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setContentTitle("5 new messages")
.setContentText("hahaha")
.setSmallIcon(R.mipmap.ic_launcher)
.setOngoing(true)
.setChannel(id);//无效
notification = notificationBuilder.build();
}
notificationManager.notify(111123, notification);
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作者：南风里
来源：CSDN
原文：https://blog.csdn.net/qq_35749683/article/details/80451791
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