Fix 2 bugs in Android game

In working tetris game, I need to implement score (see image1) and highscore window (image 3) when game finish. Game have 4 classes, and problem is with passing data between MainActivity class and Engine class, calling of methods (for highcore) and variables (for score) between these 2 classes (image 2). I tried with static variables and methods, something from tutorials, but nothing work. Error in Logcat: E/AndroidRuntime(32166): FATAL EXCEPTION: main E/AndroidRuntime(32166): [login to view URL] I guess it's easy job for someone who knows, will send project files for selected bidder so he/she can see problem before accepting job. Thanks.