Android(安卓)O中Notification进度条一直弹出提示及提示音

Android 8.0中Notification的Progress每次更新进度，都会弹出提示，并且有提示音。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_MAX);    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());}

这里需要修改NotificationChannel的importance属性：

/** * Min notification importance: only shows in the shade, below the fold. */public static final int IMPORTANCE_MIN = 1;/** * Low notification importance: shows everywhere, but is not intrusive. */public static final int IMPORTANCE_LOW = 2;/** * Default notification importance: shows everywhere, makes noise, but does not visually * intrude. */public static final int IMPORTANCE_DEFAULT = 3;/** * Higher notification importance: shows everywhere, makes noise and peeks. May use full screen * intents. */public static final int IMPORTANCE_HIGH = 4;

/** * Unused. */public static final int IMPORTANCE_MAX = 5;

这里的IMPORTANCE_MAX应该和IMPORTANCE_HIGH属性类似，表示显示时有声音，且会出现弹框提示。在Android 8.0中，这样设置后，Progress每次更新都会有声音和弹框。

把IMPORTANCE_MAX修改为IMPORTANCE_LOW，则不会出现该现象。

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 );    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());}

但是虽然修改了IMPORTANCE_LOW属性，通过Android Studio直接安装，发现并不生效，这里请参考我的另一个博文：

https://blog.csdn.net/u012551029/article/details/79917099

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