Android O 8.0 通知(Notification)更新后的简单兼容写法

  我是Android初学者，在看第一行代码学习自学时，其中通知用到NotificationCompat()这个V4库中的方法。但是在实际使用时发现书上的代码已经过时并且Android8.0已经不支持这种写法，经过几天的研究终于写出一个可以同时兼容Android8.0及以下的通知写法再此把我的研究过程写给大家。

  ·查找的资料

  代码过时第一想到的就是看源码的替代代码是什么，所以我贴上源码的截图参考

  仔细看一下官方的说明

  通过百度在一篇文章中详细介绍了channel的用法及其特性，我贴出地址 http://www.jianshu.com/p/92afa56aee05

  我按照文章中的方法创建了channel并在NotificationCompat中使用，但是在模拟器中出现了BUG 界面出错并且抽风。

  贴出错误代码

            String id = "channel_1";
            String description = "123";
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationChannel mChannel = new NotificationChannel(id, "123", importance);
            //  mChannel.setDescription(description);
            //  mChannel.enableLights(true);
            //  mChannel.setLightColor(Color.RED);
            //  mChannel.enableVibration(true);
            //  mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
            mNotificationManager.createNotificationChannel(mChannel);
            Notification notification = new Notification.Builder(this, id)
                    .setContentTitle("Title")
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                    .setContentTitle("您有一条新通知")
                    .setContentText("这是一条逗你玩的消息")
                    .setAutoCancel(true)
//                    .setContentIntent(pintent)
                    .build();
            mNotificationManager.notify(1, notification);

这样写会出现如下错误还伴随卡死

  大概可能是不安全吧 关于Android O的写法在网上很少 最后在一个国外网站上看到一种写法可行 并且我把它改编 还可以适配Android8.0以下的系统

  贴出国外网站 http://forum.yourwebapp.mobi/android-o-how-to-use-notification-channels/不得不说标题非常亲民啊：ANDROID O: HOW TO USE NOTIFICATION CHANNELS

  ·改编后的具有简单兼容性的代码

NotificationUtils:

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.ContextWrapper;
import android.os.Build;
import android.support.v4.app.NotificationCompat;

/**
 * Created by LaoZhao on 2017/11/19.
 */

public class NotificationUtils extends ContextWrapper {

    private NotificationManager manager;
    public static final String id = "channel_1";
    public static final String name = "channel_name_1";

    public NotificationUtils(Context context){
        super(context);
    }

    public void createNotificationChannel(){
        NotificationChannel channel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_HIGH);
        getManager().createNotificationChannel(channel);
    }
    private NotificationManager getManager(){
        if (manager == null){
            manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        }
        return manager;
    }
    public Notification.Builder getChannelNotification(String title, String content){
        return new Notification.Builder(getApplicationContext(), id)
                .setContentTitle(title)
                .setContentText(content)
                .setSmallIcon(android.R.drawable.stat_notify_more)
                .setAutoCancel(true);
    }
    public NotificationCompat.Builder getNotification_25(String title, String content){
        return new NotificationCompat.Builder(getApplicationContext())
                .setContentTitle(title)
                .setContentText(content)
                .setSmallIcon(android.R.drawable.stat_notify_more)
                .setAutoCancel(true);
    }
    public void sendNotification(String title, String content){
        if (Build.VERSION.SDK_INT>=26){
            createNotificationChannel();
            Notification notification = getChannelNotification
                    (title, content).build();
            getManager().notify(1,notification);
        }else{
            Notification notification = getNotification_25(title, content).build();
            getManager().notify(1,notification);
        }
    }
}

MainActivity:

import android.app.NotificationManager;
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{

    private NotificationManager mManager;
    private Button sendn;
    public static final String id = "channel_1";
    public static final String name = "名字";
    private NotificationUtils notificationUtils;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sendn = findViewById(R.id.send_notice);
        sendn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.send_notice:
                NotificationUtils notificationUtils = new NotificationUtils(this);
                notificationUtils.sendNotification("测试标题", "测试内容");
        }
    }
}

布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/send_notice"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="发送通知"/>

</LinearLayout>

  经过测试可以在8.0模拟器和7.0模拟器运行。