The thing is, I am a devoted ebook reader and I couldn’t find a grayscale effect in the official Kindle App for Android. Now that I didn’t get that thing, it immediately struck me that I should add the effect. And I couldn’t add the values to the app and code every bit of it – it would have wasted my time if I did so.

So I tweaked some strings to change the Sepia mode to Kindle Gray color and compiled the app.

Now I feel comfortable wi...