推送通知图标显示为灰色

Question

In my app Firebase push notification not displaying icon properly, It showing total gray color icon in notification. Code I using for implementing notifications

var notificationBuilder = new Notification.Builder(this)
.SetSmallIcon(Resource.Drawable.ic_launcherLmg)
.SetContentTitle(user.Organization)
.SetSubText(user.ModuleName)
.SetContentText(user.BodyText)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent)
.Build();

Icon I am setting at SetSmallIcon(Resource.Drawable.ic_launcherLmg) line. ic_launcherLmg icon is available in below folders wtih given dimensoins

1. drawable-idpi--36x36
2. drawable-mdpi--48x48
3. drawable-hdpi--72x72
4. drawable-xhdpi--96x96

App targating Highest 8.1 API. Minimun 5.0 API.

Screenshot of push notification

Answer 1

Maybe your icon is not showing with background fcm push? So you need to put this inside application tag inside manifest as described here here :

<meta-data android:name="com.google.firebase.messaging.default_notification_icon"
    android:resource="@drawable/ic_launcherLmg" />

Android displays this custom default icon for all notification messages where the notification icon is not explicitly set.

Answer 2

You can use

Use a mipmap icon instead of a drawable icon and put it in xxxhdpi-mipmap folder. The icon will automatically adjust its color if the background is white

or

Use notification icon as android version like

.SetSmallIcon(getNotificationIcon())

and the function is or change it as you want

private int getNotificationIcon() {
    boolean useWhiteIcon = (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP);
    return useWhiteIcon ? R.drawable.icon_silhouette : R.drawable.ic_launcher;
}

Answer 3

Finally this issue solved by changing the color of icon. Whatever the content of notification icon we want to show that should be in Gray color & background of icon should be White . Example image

I did not notice size concern, however the preferred size should be

• mdpi (160 dpi) 24 x 24 px
• hdpi (240 dpi) 36 x 36 px
• xhdpi (320 dpi) 48 x 48 px
• xxhdpi (400 dpi) 60 x 60 px