Android8.0 NotificationChannel配置问题

.... ..问题： android8.0的技术革新中，需要在以往notification的基础上添加notificationChannel传输通道，否则会报错：Failed to post notification on channel “null”
... ..解决办法：1.如果代码中大量使用notification，需要将该方法新建一个类更佳
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;
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) ;
}  
public NotificationCompat.Builder getNotification(String title, String content){  
    return new NotificationCompat.Builder(getApplicationContext())  
            .setContentTitle(title)  
            .setContentText(content)  
            .setSmallIcon(android.R.drawable.stat_notify_more);  
}  
public void sendNotification(String title, String content){  
    if (Build.VERSION.SDK_INT>=26){  
        createNotificationChannel();  
        Notification notification = getChannelNotification  
                (title, content).build();  
        getManager().notify(1,notification);  
        getManager().createNotificationChannel(mChannel);  
    }else{  
        Notification notification = getNotification(title, content).build();  
        getManager().notify(1,notification);  
        getManager().createNotificationChannel(mChannel);  
    }  
 }  
} 

... ..类中调用：

      NotificationUtils notificationUtils = new NotificationUtils(this);  
      notificationUtils.sendNotification("测试标题", "测试内容");