Android 8.0 Notification 写法Example

package com.example.myapplication;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    Button btn1;
    Button btn2;
    final static String GROUPONE_KEY = "GROUPONE";
    final static String GROUPTWO_KEY = "GROUPTWO";
    NotificationManager mNotifyMgr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1 = findViewById(R.id.btn1);
        btn2 = findViewById(R.id.btn2);
        mNotifyMgr =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn1:
                notify1();
                break;
            case R.id.btn2:
                notify2();
                break;
        }
    }

    public void notify1() {
        //ChannelId为"1",ChannelName为"Channel1"
        NotificationChannel channel = new NotificationChannel("1",
                "Channel1", NotificationManager.IMPORTANCE_DEFAULT);
        channel.enableLights(true); //是否在桌面icon右上角展示小红点
        channel.setLightColor(Color.GREEN); //小红点颜色
        channel.setShowBadge(true); //是否在久按桌面图标时显示此渠道的通知
        mNotifyMgr.createNotificationChannel(channel);

        int notificationId = 0x1234;
        Notification.Builder builder = new Notification.Builder(this,"1"); //与channelId对应
        //icon title text必须包含，不然影响桌面图标小红点的展示
        builder.setSmallIcon(R.drawable.icon1)
                .setContentTitle("111")
                .setContentText("1111");
        mNotifyMgr.notify(notificationId, builder.build());

        //builder.setGroup(GROUPONE_KEY);
    }

    public void notify2() {
        //ChannelId为"1",ChannelName为"Channel1"
        NotificationChannel channel = new NotificationChannel("2",
                "Channel2", NotificationManager.IMPORTANCE_DEFAULT);
        channel.enableLights(true); //是否在桌面icon右上角展示小红点
        channel.setLightColor(Color.GREEN); //小红点颜色
        channel.setShowBadge(true); //是否在久按桌面图标时显示此渠道的通知
        mNotifyMgr.createNotificationChannel(channel);

        int notificationId = 0x1235;
        Notification.Builder builder = new Notification.Builder(this,"2"); //与channelId对应
        //icon title text必须包含，不然影响桌面图标小红点的展示
        builder.setSmallIcon(R.drawable.icon2)
                .setContentTitle("222")
                .setContentText("2222");
        mNotifyMgr.notify(notificationId, builder.build());
    }
}