当targetSdkVersion大于等于26时， 在8.0及以上机型，Notification都要指定NotificationChannel，不指定NotificationChannel会导致Push不能展示在通知栏，为不影响Photon Push SDK产生的通知栏展示，接入方需要做以下适配：

• Photon Push SDK升级到2.1.0以上版本

• 接入方客户端自行创建和维护NotificationChannel，可根据业务类型创建不同的NotificationChannel，通道对应的描述文案、铃声、震动设置等由接入方根据业务类型自定义

    public static final String NOTIFICATION_CHANNEL_ID_DEFAULT = "notification.default";
    public static final String NOTIFICATION_CHANNEL_ID_MSG = "notification.msg";
    public static final String NOTIFICATION_CHANNEL_ID_OTHERS = "notification.others";

    void createDefaultChannel(Context context) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
            return;
        }
        NotificationManager nm = (NotificationManager) context.getSystemService(
                NOTIFICATION_SERVICE);

        NotificationChannel notificationChannel = nm.getNotificationChannel(NOTIFICATION_CHANNEL_ID_DEFAULT);
        if (null == notificationChannel) {
            notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID_DEFAULT, "默认通知", NotificationManager.IMPORTANCE_DEFAULT);
            notificationChannel.setDescription("消息推送默认通知类别");
            notificationChannel.enableLights(true);
            notificationChannel.setLightColor(Color.BLUE);
            notificationChannel.enableVibration(true);
            notificationChannel.setVibrationPattern(new long[]{50, 100});

            nm.createNotificationChannel(notificationChannel);
        }
    }

    void createMSGChannel(Context context) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
            return;
        }
        NotificationManager nm = (NotificationManager) context.getSystemService(
                NOTIFICATION_SERVICE);

        NotificationChannel notificationChannel = nm.getNotificationChannel(NOTIFICATION_CHANNEL_ID_MSG);
        if (null == notificationChannel) {
            notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID_MSG, "新消息通知", NotificationManager.IMPORTANCE_HIGH);
            notificationChannel.setDescription("收到新消息时使用的通知类别");
            notificationChannel.enableLights(true);
            notificationChannel.setLightColor(Color.BLUE);
            notificationChannel.enableVibration(true);
            notificationChannel.setVibrationPattern(new long[]{50, 100});

            notificationChannel.setSound(Uri.parse("android.resource://" + context.getPackageName() + "/" + R.raw.ms2), new AudioAttributes.Builder()
                    .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                    .setUsage(AudioAttributes.USAGE_NOTIFICATION)
                    .build());


            nm.createNotificationChannel(notificationChannel);
        }
    }

    void createOtherChannel(Context context) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
            return;
        }
        NotificationManager nm = (NotificationManager) context.getSystemService(
                NOTIFICATION_SERVICE);

        NotificationChannel notificationChannel = nm.getNotificationChannel(NOTIFICATION_CHANNEL_ID_OTHERS);
        if (null == notificationChannel) {
            notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID_OTHERS, "其他通知", NotificationManager.IMPORTANCE_LOW);
            notificationChannel.setDescription("其他不重要消息的通知类别");
            notificationChannel.enableLights(true);
            notificationChannel.setLightColor(Color.BLUE);
            notificationChannel.enableVibration(false);

            nm.createNotificationChannel(notificationChannel);
        }
    }

建议在Application onCreate方法中调用；调用以上方法创建NotificationChannel后，在系统设置-应用通知下会产生通知类别列表（某些国产手机通道类型数为1时不显示列表）

• 服务端Api推送需传入channelId；使用推送后台推送需要输入channelId

• 需要注意的是，使用targetSdkVersion大于等于26编译，运行在Android 8.0及以上的应用，服务端传的铃声、震动等设置将不再生效，取而代之的是channelId对应NotificationChannel创建时的设置或用户在系统通知设置更改后的设置；可引导用户跳转到NotificationChannel的设置页面

    void gotoDefaultChannelSetting() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
            intent.putExtra(Settings.EXTRA_CHANNEL_ID, MyApplication.NOTIFICATION_CHANNEL_ID_DEFAULT);
            intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName());
            startActivity(intent);
        }
    }

调用以上方法，传入指定channelId，可跳转到对应NotificationChannel的系统设置页