Android(安卓)O中修改NotificationChannel 属性，升级app后该修改不生效，必须卸载app重新安装才能生效

Android 8.0中修改NotificationChannel 属性，升级app后该修改不生效，必须卸载app重新安装才能生效，原代码如下：

public void notifyDownloading(long progress, long num, String file_name) {    Notification.Builder mBuilder;    mBuilder = new Notification.Builder(MainActivity.this, TAG );    NotificationChannel channel;    channel = new NotificationChannel(TAG , file_name, NotificationManager.IMPORTANCE_LOW);    mNotifyManager.createNotificationChannel(channel);    mBuilder.setSmallIcon(R.drawable.notification_download_icon);    mBuilder.setProgress((int) num, (int) progress, false);    mBuilder.setContentInfo(getPercent((int) progress, (int) num));    mBuilder.setOngoing(true);    mBuilder.setWhen(System.currentTimeMillis());    mBuilder.setContentTitle(file_name);    mBuilder.setContentText("download");    PendingIntent pendIntent = PendingIntent.getActivity(            MainActivity.this, NOTIFY_ID, getCurActivityIntent(), PendingIntent.FLAG_UPDATE_CURRENT);    mBuilder.setContentIntent(pendIntent);    mNotifyManager.notify(NOTIFY_ID, mBuilder.build());}

这里将IMPORTANCE_HIGH修改为IMPORTANCE_LOW，通过Android Studio直接安装，发现修改不生效，app的效果还是IMPORTANCE_HIGH属性的效果。总之，一脸懵逼。。。

经过若干猜测和尝试，发现修改每次创建Notification.Builder的id和NotificationChannel的id就可以规避该问题，修改后代码如下：

public void notifyDownloading(long progress, long num, String file_name) {    Notification.Builder mBuilder;    mBuilder = new Notification.Builder(MainActivity.this, TAG + System.currentTimeMillis());    NotificationChannel channel;    channel = new NotificationChannel(TAG + System.currentTimeMillis(), file_name, NotificationManager.IMPORTANCE_LOW);    mNotifyManager.createNotificationChannel(channel);    mBuilder.setSmallIcon(R.drawable.notification_download_icon);    mBuilder.setProgress((int) num, (int) progress, false);    mBuilder.setContentInfo(getPercent((int) progress, (int) num));    mBuilder.setOngoing(true);    mBuilder.setWhen(System.currentTimeMillis());    mBuilder.setContentTitle(file_name);    mBuilder.setContentText("download");    PendingIntent pendIntent = PendingIntent.getActivity(            MainActivity.this, NOTIFY_ID, getCurActivityIntent(), PendingIntent.FLAG_UPDATE_CURRENT);    mBuilder.setContentIntent(pendIntent);    mNotifyManager.notify(NOTIFY_ID, mBuilder.build());}

通过System.currentTimeMillis()保证每次创建对象的Id不同。

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