Android如何使用Notification进行通知

有两张图片素材会放在末尾

activity代码，和XML布局

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.NotificationCompat;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

public class NotificationActivity extends AppCompatActivity {
    public static NotificationManager notificationManager;
    public static String CHANNEL_1 = "channel1";
    Notification notification;
    ImageView iv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_notification);

        iv = findViewById(R.id.iv);
        iv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                iv.setImageResource(R.drawable.aoligei);
                notificationManager = (NotificationManager) NotificationActivity.this.getSystemService(Context.NOTIFICATION_SERVICE);
                //android 8.0有通知渠道，如果不设置的话，会报错
                if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
                    ////配置通知渠道id,渠道名称（用户可以看到），渠道优先级
                    NotificationChannel channel1 = new NotificationChannel(CHANNEL_1, "通知渠道1", NotificationManager.IMPORTANCE_HIGH);
                    channel1.setDescription("通知渠道的描述1");
                    ///配置通知出现时的闪灯（如果 android 设备支持的话）
                    channel1.enableLights(true);
                    channel1.setLightColor(Color.WHITE);
                    //配置通知出现时的震动（如果 android 设备支持的话）
                    channel1.enableVibration(true);
                    channel1.setVibrationPattern(new long[]{100, 200, 100, 200});
                    //channel.setBypassDnd(true); //设置绕过免打扰模式
                    //channel.canBypassDnd(); //检测是否绕过免打扰模式
                    //channel.setLockscreenVisibility(Notification.VISIBILITY_SECRET);//设置在锁屏界面上显示这条通知
                    notificationManager.createNotificationChannel(channel1);

//                    NotificationChannel channel = new NotificationChannel("id", "name", NotificationManager.IMPORTANCE_HIGH);
//                    channel.setShowBadge(true);
//                    NotificationManager notificationManager = (NotificationManager) getSystemService(
//                            NOTIFICATION_SERVICE);
//                    notificationManager.createNotificationChannel(channel);
                }

                //普通的通知
//                sendChatMsg();
                //可以点击的通知
                preIntent();
            }
            });

        }
    public void sendChatMsg() {
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Notification notification = new NotificationCompat.Builder(this, CHANNEL_1)
                .setContentTitle("收到一条聊天消息")
                .setContentText("老八问候你吃了吗")
                .setWhen(System.currentTimeMillis())
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher_background))
                .setAutoCancel(true)
                .setNumber(2)
                .build();

//        for (int i = 0; i < 3; i++) {
            manager.notify(1, notification);
//        }
    }
    public void preIntent(){

        NotificationManager manager1 = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        //创建一个可以点击的通知
        //通知的需要跳转，创建Intent
        Intent intent = new Intent(NotificationActivity.this, NotificationActivity.class);
        //需要创建PendingIntent进行
        PendingIntent pendingIntent = PendingIntent.getActivity(NotificationActivity.this, 0, intent, 0);
        //创建notification
        notification = new Notification.Builder(NotificationActivity.this,CHANNEL_1).//第二个参数需要保持一致
                setContentTitle("这是一个通知") .setContentText("快来和老八一起共进晚餐") .
                setWhen(System.currentTimeMillis()) .
                setSmallIcon(R.mipmap.ic_launcher) .
                setLargeIcon(BitmapFactory.decodeResource(  getResources(), R.mipmap.ic_launcher)) .
                setContentIntent(pendingIntent).
                build();
        //。build就是创建的意思
        //这个id是随便起的名字，只要id不同可以多个显示，如果id相同，会显示玩当前id的通知才会显示下一个id
                manager1.notify(0x11, notification);
    }

}

XML布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".NotificationActivity">
<ImageView
    android:id="@+id/iv"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/haha"
    />
<!--    android:adjustViewBounds="true"-->
<!--    android:scaleType="fitXY"-->

</LinearLayout>