How do I get the resource ID of the app icon in my applicaton from an API

I am writing an API that can be included in various APK's. I want to generate a notification with that app's icon, which requires the resource ID. I'm not finding a way to find the resource ID. I don't know the name of the app's icon. Context is passed in to my class in the constructor. Here is what I have so far:

        ApplicationInfo app = mContext.getApplicationInfo();
        packageManager = mContext.getPackageManager();

        Drawable drawable = packageManager.getApplicationIcon(app);
        String packageName = packageManager.getApplicationLabel(app);

        // logical next step, but I don't know the name of the drawable
        int appIconId = mContext.getResources().getIdentifier("???", "drawable", packageName);

Thank you!

Solution

I'm afraid that this information needs to be injected into your code by the caller. For example, it could be passed in as an integer parameter along with the Context when calling the appropriate constructor / initialization method.

At least this would also mean that your user has grater control over the appearance of the notifications of your component - I'd consider this a good thing.