Notification之8.0以上无效解决

• 今天使用Notification做一个通知消息的时候，突然TMD居然无效，反复的搞整无果，于是乎谷歌了一把，发现跟系统版本有关系，貌似8.0系统以上的系统使用以前的方法实现都无效，万能的百度告诉我需要设置渠道，结果可以正常实现了，废话不多说了，直接上马:

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Build;
import android.support.annotation.RequiresApi;
import com.jbh.goldrush.R;
import static android.content.Context.NOTIFICATION_SERVICE;

public class NotificationUtil {


    private Context mContext;
    private NotificationManager notificationManager;
    private int progress = 0 ;
    private int notificationId = 0x2154;
    private Notification.Builder builder;
    private String ContentTitle = "";
    private String ContentText = "";


    /**
     * @param context
     */
    public NotificationUtil(Context context){
        this.mContext = context;
        notificationManager = (NotificationManager) mContext.getSystemService(NOTIFICATION_SERVICE);
        sendNotification();
    }


    @TargetApi(Build.VERSION_CODES.O)
    private void sendNotification(){
        String channelId = "my_channel_01";
        String name="我是渠道名字";
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            @SuppressLint("WrongConstant")
            NotificationChannel mChannel = new NotificationChannel(channelId, name, NotificationManager.IMPORTANCE_LOW);
            notificationManager.createNotificationChannel(mChannel);
            builder = new Notification.Builder(mContext)
                    .setChannelId(channelId)  //设置渠道id
                    .setContentTitle(ContentTitle)
                    .setContentText(ContentText)
                    .setSmallIcon(R.mipmap.app_logo);
            LogUtils.TOAST("O");
        } else {
            builder = new Notification.Builder(mContext)
                    .setContentTitle(ContentTitle)
                    .setContentText(ContentText)
                    .setSmallIcon(R.mipmap.app_logo)
                    .setOngoing(true)
                    .setChannelId(channelId);//无效
            LogUtils.TOAST("dfasd");
        }
        notificationManager.notify(notificationId, builder.build());
    }


    /**
     * @param contentText
     * @return
     */
    public NotificationUtil setContentText(String contentText) {
        ContentText = contentText;
        return NotificationUtil.this ;
    }


    /**
     *
     * @param contentTitle
     * @return
     */
    public NotificationUtil setContentTitle(String contentTitle) {
        ContentTitle = contentTitle;
        return NotificationUtil.this ;
    }




    /**
     * @param progress
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    public void setProgress(int progress){
        if (builder==null)return;
        builder.setProgress(100,progress,false);
        builder.setContentTitle("下载中...");
        if (progress==100){
            builder.setContentTitle("下载完成");
            //自动移除
            notificationManager.cancel(notificationId);
        }else {
            notificationManager.notify(notificationId, builder.build());//显示通知
        }
    }



   public void ceShi(){
    new Thread(new Runnable() {
            @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
            @Override
            public void run() {
                while (progress++<100){
                    setProgress(progress);
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }