Android O上获取Adaptive Icon的Bitmap对象

常见场景：

通过BitmapFactory.decodeResource的方式，设置Notification的LargeIcon，当APP适配了自适应Icon后，获取不到Bitmap对象。

方式一：

public Bitmap getAppIcon(Context context) {
    if (context == null) {
        return null;
    }

    try {
        PackageManager packageManager = context.getApplicationContext().getPackageManager();
        String packageName = context.getApplicationContext().getPackageName();
        Drawable drawable = packageManager.getApplicationIcon(packageName);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (drawable instanceof BitmapDrawable) {
                return ((BitmapDrawable) drawable).getBitmap();
            } else if (drawable instanceof AdaptiveIconDrawable) {
                Drawable[] drr = new Drawable[2];
                drr[0] = ((AdaptiveIconDrawable) drawable).getBackground();
                drr[1] = ((AdaptiveIconDrawable) drawable).getForeground();

                LayerDrawable layerDrawable = new LayerDrawable(drr);
                int width = layerDrawable.getIntrinsicWidth();
                int height = layerDrawable.getIntrinsicHeight();

                Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(bitmap);
                layerDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
                layerDrawable.draw(canvas);
                return bitmap;
            }
        } else {
            return ((BitmapDrawable) drawable).getBitmap();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

方式二：

public Bitmap getAppIcon(Context context) {
    if (context == null) {
        return null;
    }

    try {
        PackageManager packageManager = context.getApplicationContext().getPackageManager();
        String packageName = context.getApplicationContext().getPackageName();
        Drawable drawable = packageManager.getApplicationIcon(packageName);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (drawable instanceof BitmapDrawable) {
                return ((BitmapDrawable) drawable).getBitmap();
            } else if (drawable instanceof AdaptiveIconDrawable) {
                Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(bitmap);
                drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
                drawable.draw(canvas);
                return bitmap;
            }
        } else {
            return ((BitmapDrawable) drawable).getBitmap();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}