I\'m working on an Android app, in which I want to integrate a Facebook posting feature. I downloaded the Facebook-Android SDK, and I got the readme.md (text file) in there,
You can get key hash from SHA-1 key. Its very simple you need to get your SHA-1(Signed APK) key from Play Store check below image.
Now Copy that SHA-1 key and past it in this website http://tomeko.net also check below image to get your Key Hash.