This tool decode Android's pattern lock screen with gesture.key file in Android device. It just decode 3x3 dimensions schema.
You can copy Android's file at /data/system/gesture.key in your computer. And run jar file :
java -jar DecodeAndroidGesture.jar gesture.key
After a few instant, the tool return digits sequence. Each digits represent a ball in your Android's pattern lock screen.
Android's pattern lock screen can be represented by this schema :
+---+---+---+
| 0 | 1 | 2 |
+---+---+---+
| 3 | 4 | 5 |
+---+---+---+
| 6 | 7 | 8 |
+---+---+---+
In this schema, each digits represent a ball.