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

Question

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!

Answer 1

This method should work for getting the app icon of ANY application, including yours:

String packageName=...; //use getPackageName() in case you wish to use yours
final PackageManager pm=getPackageManager();
final ApplicationInfo applicationInfo=pm.getApplicationInfo(packageName,PackageManager.GET_META_DATA);
final Resources resources=pm.getResourcesForApplication(applicationInfo);
final int appIconResId=applicationInfo.icon;
final Bitmap appIconBitmap=BitmapFactory.decodeResource(resources,appIconResId);