forgotten keystore password for android apk signing
First tip: always remember your keystore password.
Keystore is used for signing apps before they are submitted to google’s playstore.
After about 6 months away from android, I had forgotten mine. If it is more than 5 characters (which it should be), it is pretty hard to crack. Luckily I remembered mine. But if not, then second tip is to check this page to recover your keystore password. Only works with Java 7 and above though. And probably takes ages. So don’t forget your password!