Why do icons set with Notification.Builder.setSmallIcon in Android Lollipop show as a white square?

Question

I have this code:

Notification notif;

// Build notification
Notification.Builder notifBuilder = new Notification.Builder(context);
notifBuilder.setContentIn         


        

Answer 1

Anyone still looking at this, the simplest way of getting your icon to display correctly is first rendering it with the Android Icon Studio here:

https://romannurik.github.io/AndroidAssetStudio/icons-notification.html

Unzip the files from the downloaded zip into your project /main folder, so they slot into the relevant drawable-xxxx folders.

Then, to change colour in the notification use something like this:

NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
    .setSmallIcon(R.drawable.ic_notification_appicon) // <-- Icon from Android Icon Studio 
    .setColor(context.getColor(R.color.holo_blue))    // <-- Set your preferred icon colour to appear in the notification dropdown list
    .setContentTitle("Title")
    .setContentText("Content")
    .setAutoCancel(true)
    .setCategory(NotificationCompat.CATEGORY_EVENT)
    .setDefaults(Notification.DEFAULT_ALL)
    .setPriority(NotificationCompat.PRIORITY_DEFAULT);