Android 8.0 通知适配：

Android Api 26 Notification Builder 构建方法 Builder(Context contenxt) 已弃用 Builder创建时要传入Notifications or NotificationChannel Id

       /**
         * @deprecated use {@link Notification.Builder#Notification.Builder(Context, String)}
         * instead. All posted Notifications must specify a NotificationChannel Id.
         */
        @Deprecated
        public Builder(Context context) {
            this(context, (Notification) null);
        }

创建 NotificationChannel 对象

   /**
     * Creates a notification channel.
     *
     * @param id The id of the channel. Must be unique per package. The value may be truncated if
     *           it is too long. ps: 每个app包下的Id 必须是唯一的
     * @param name The user visible name of the channel. You can rename this channel when the system
     *             locale changes by listening for the {@link Intent#ACTION_LOCALE_CHANGED}
     *             broadcast. The recommended maximum length is 40 characters; the value may be
     *             truncated if it is too long.
     * @param importance The importance of the channel. This controls how interruptive notifications
     *                   posted to this channel are.
     */
    public NotificationChannel(String id, CharSequence name, @Importance int importance) {
        this.mId = getTrimmedString(id);
        this.mName = name != null ? getTrimmedString(name.toString()) : null;
        this.mImportance = importance;
    }

     /**
     * 通知内容
     */
    @RequiresApi(api = Build.VERSION_CODES.O)
    public void noticeEightInit(@NonNull String msg) {
        this.noticeEightInit(msg, null);
    }

    /**
     * 通知内容
     *
     * @param msg
     * @param intent
     */
    @RequiresApi(api = Build.VERSION_CODES.O)
    public void noticeEightInit(String msg, Intent intent) {
        Notification.Builder builder = new Notification.Builder(mContext, "1");
        builder.setLargeIcon(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.ic_logo));
        builder.setSmallIcon(R.drawable.ic_logo);
        builder.setPriority(Notification.PRIORITY_DEFAULT);
        builder.setCategory(Notification.CATEGORY_MESSAGE);
        builder.setAutoCancel(true); //自动消失
        builder.setWhen(System.currentTimeMillis());
        builder.setContentTitle("测试通知");
        builder.setContentText(msg);
        builder.setSubText("测试通知");
        if (intent != null) {
            PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
            builder.setFullScreenIntent(pendingIntent, true);
        }
        NotificationManager manager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
        //ChannelId为"1",ChannelName为"Channel_One"
        NotificationChannel channel = new NotificationChannel("1",
                "Channel_One", NotificationManager.IMPORTANCE_DEFAULT);
        channel.enableLights(true); //是否在桌面icon右上角展示小红点
        channel.setLightColor(Color.RED); //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
        manager.createNotificationChannel(channel);
        manager.notify(1, builder.build());
    }