Android Notification.Builder: show a notification

问题:

 String ns = Context.NOTIFICATION_SERVICE;
 NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

 int icon = R.drawable.ic_notification_icon;
 android.app.Notification.Builder nbuilder = new Notification.Builder(this);

 nbuilder.setContentTitle(getString(R.string.notifcation_title,mProfile.mName));
 nbuilder.setContentText(msg);
 nbuilder.setOnlyAlertOnce(true);
 nbuilder.setOngoing(true);
 nbuilder.setSmallIcon(icon,level.level);

How can I hide or completely delete the smallIcon? I tried to not use nbuilder.setSmallIcon, but the result is that the notification is not shown at all!

回答1:

On Jelly Bean and later you can use nbuilder.setPriority(Notification.PRIORITY_MIN); the exact interpretation of this priority level is left up to the system UI, but in AOSP this causes the notification's icon to be hidden.

This is intended for "ambient" or "background" information that doesn't need to get the user's attention, but if the user happens to be poking around the notification panel, she might be interested. See the Notifications section of the Android Design site for more about how to best use notification priority.

回答2:

Update: don't use it on Android 7, it's crashing

---

Using reflection, here's something that's working in Lollipop (emulators and Moto G device) and Marshmallow (emulator)

Notification notification = NotificationCompat.Builder.blabla().build();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
  int smallIconViewId = context.getResources().getIdentifier("right_icon", "id", android.R.class.getPackage().getName());

  if (smallIconViewId != 0) {
    if (notification.contentIntent != null)
      notification.contentView.setViewVisibility(smallIconViewId, View.INVISIBLE);

    if (notification.headsUpContentView != null)
      notification.headsUpContentView.setViewVisibility(smallIconViewId, View.INVISIBLE);

    if (notification.bigContentView != null)
      notification.bigContentView.setViewVisibility(smallIconViewId, View.INVISIBLE);
  }
}

I couldn't find a better way.

This can stop working the moment they change the id of the view or alter any of the RemoteViews fields inside Notification, so use at your own risk.

回答3:

you can't do that... without setSmallIcon(icon,level.level); Notification is not showing..

回答4:

You can set your own layout without icon:

RemoteViews notificationView = new RemoteViews( context.getPackageName(), R.layout.notify ); NotificationCompat.Builder builder = new NotificationCompat.Builder(context) .setContent(notificationView)

回答5:

Try in your Notification builder adding this line
.setPriority(Notification.PRIORITY_MIN)
So your Notification will be like this :
Notification notification = new Notification.Builder(this) .setSmallIcon(R.drawable.stat_notify_chat) .setContentTitle("my app") .setContentText("my app ") .setPriority(Notification.PRIORITY_MIN) .setContentIntent(pendingIntent).build();
So in this Case you can see your icon just in Notification bar and it be hide in status bar . hope this help .

回答6:

I faced this problem before and solved it like that:

private int getNotificationIcon() {
    boolean useWhiteIcon = (android.os.Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.LOLLIPOP);
    // LOLLIPOP or Marshmellew>>>>>>>>>>>>>>>>>>>>> KitKat or Less
    return useWhiteIcon ? R.drawable.logo_new : R.drawable.logo;
}

and just call this function in setSmallIcon()

nbuilder.setSmallIcon(getNotificationIcon());