android 9.0通知栏适配，可用通知栏，悬浮通知，震动，提示音，

直接代码，demo复制到一个新的activity可用

android 9.0，设置对应手机弹窗方式即可

package com.example.administrator.myapplication;

import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationChannelGroup;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.TaskStackBuilder;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;



import static android.app.Notification.BADGE_ICON_SMALL;
/**
 * @author Administrator
 */
public class MainActivity extends AppCompatActivity {

    private NotificationManager mNotificationManager;

    private String groupId = "groupId";
    private CharSequence groupName = "Group1";

    private String groupId2 = "groupId2";
    private CharSequence groupName2 = "Group2";
    private String chatChannelId2 = "chatChannelId2";
    private String adChannelId2 = "adChannelId2";

    private String chatChannelId = "chatChannelId";
    private String chatChannelName = "聊天通知";
    private String chatChannelDesc = "这是一个聊天通知，建议您置于开启状态，这样才不会漏掉女朋友的消息哦";
    private int chatChannelImportance = NotificationManager.IMPORTANCE_MAX;

    private String adChannelId = "adChannelId";
    private String adChannelName = "广告通知";
    private String adChannelDesc = "这是一个广告通知，可以关闭的，但是如果您希望我们做出更好的软件服务于你，请打开广告支持一下吧";
    private int adChannelImportance = NotificationManager.IMPORTANCE_LOW;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        createGroup();
        notification();
    }

    public void notification() {
        createNotificationChannel(chatChannelId, chatChannelName, chatChannelImportance, chatChannelDesc, groupId2);

        Notification.Builder builder = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            builder = new Notification.Builder(this, chatChannelId);
            builder.setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle("我是标题")
                    .setContentText("内容：Today released Android 8.0 version of its name is Oreo")
                    .setBadgeIconType(BADGE_ICON_SMALL)
                    .setNumber(1)
                    .setAutoCancel(true);
            Intent resultIntent = new Intent(this, MainActivity.class);
            TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
            stackBuilder.addParentStack(MainActivity.class);
            stackBuilder.addNextIntent(resultIntent);
            PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
            builder.setContentIntent(resultPendingIntent);

            mNotificationManager.notify((int) System.currentTimeMillis(), builder.build());
        }

    }

    public void notification2() {
        createNotificationChannel(adChannelId, adChannelName, adChannelImportance, adChannelDesc, groupId2);

        Notification.Builder builder = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            builder = new Notification.Builder(this, adChannelId);
            builder.setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle("我是广告")
                    .setContentText("内容：恰饭时间到了，Oreo is Coming.")
                    .setBadgeIconType(BADGE_ICON_SMALL)
                    .setNumber(1)
                    .setAutoCancel(true);

            Intent resultIntent = new Intent(this, MainActivity.class);
            TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
            stackBuilder.addParentStack(MainActivity.class);
            stackBuilder.addNextIntent(resultIntent);
            PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
            builder.setContentIntent(resultPendingIntent);
            mNotificationManager.notify((int) System.currentTimeMillis(), builder.build());
        }

    }

    public void createNotificationChannel(String id, String name, int importance, String desc, String groupId) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (mNotificationManager.getNotificationChannel(id) != null) {
                return;
            }

            NotificationChannel notificationChannel = new NotificationChannel(id, name, importance);
            notificationChannel.enableLights(true);
            notificationChannel.enableVibration(true);

            notificationChannel.setLightColor(Color.RED);
            notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
            notificationChannel.setShowBadge(true);
            notificationChannel.setBypassDnd(true);
            notificationChannel.setVibrationPattern(new long[]{100, 200, 300, 400});
            notificationChannel.setDescription(desc);
            notificationChannel.setGroup(groupId);
//        notificationChannel.setSound();

            mNotificationManager.createNotificationChannel(notificationChannel);

        }

    }

    public void delNotification(View view) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mNotificationManager.deleteNotificationChannel(chatChannelId);
        }
    }

    public void delNotification2(View view) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mNotificationManager.deleteNotificationChannel(adChannelId);
        }
    }

    public void setting(View view) {
        Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
        intent.putExtra(Settings.EXTRA_CHANNEL_ID, chatChannelId);
        intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName());
        startActivity(intent);
    }

    public void createGroup() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mNotificationManager.createNotificationChannelGroup(new NotificationChannelGroup(groupId, groupName));
            mNotificationManager.createNotificationChannelGroup(new NotificationChannelGroup(groupId2, groupName2));
            createNotificationChannel(chatChannelId2, chatChannelName, chatChannelImportance, chatChannelDesc, groupId);
            createNotificationChannel(adChannelId2, adChannelName, adChannelImportance, adChannelDesc, groupId);
        }
    }

    public void delNotificationGroup(View view) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mNotificationManager.deleteNotificationChannelGroup(groupId2);
        }
    }

}

具体可查看：http://gavinliu.cn/2017/08/22/Android-吃奥利奥系列-1-Notification/