class ContextCompat {

    @Nullable
    public static Drawable getDrawable(@NonNull Context context, @DrawableRes int id) {
        if (Build.VERSION.SDK_INT >= 21) {
            return context.getDrawable(id);
        } else if (Build.VERSION.SDK_INT >= 16) {
            return context.getResources().getDrawable(id);
        } else {
            // Prior to JELLY_BEAN, Resources.getDrawable() would not correctly
            // retrieve the final configuration density when the resource ID
            // is a reference another Drawable resource. As a workaround, try
            // to resolve the drawable reference manually.
            final int resolvedId;
            synchronized (sLock) {
                if (sTempValue == null) {
                    sTempValue = new TypedValue();
                }
                context.getResources().getValue(id, sTempValue, true);
                resolvedId = sTempValue.resourceId;
            }
            return context.getResources().getDrawable(resolvedId);
        }
    }

    protected  ContextCompat();

}