Android: Random Generation in a Networked Situation (Multiplayer)

I wrote a class that, given a seed and difficulty, will return a playing field to my game. The generation is consistent (no matter what, the same seed & difficulty level will always result in the same play field). As far as I know all android devices use Java 1.6 so here goes my question(s):

Is it safe to send only the seed and difficulty to other devices in a multiplayer environment?

Do I need to worry about when Google updates Java version level form 1.6? or will they likely update all android devices to that version level (I am assuming the Random class will have been changed)? And if not what would be a good way to detect if Random class is different?

Rephrased, what precautionary measures should be in place to ensure that the class java.util.Random, which my field generation class uses heavily, will result in the same play field for every device? Or, alternatively, would it be more wise to consider sending all play field data to the non-hosting device(s)?

I could probably accomplish the latter with a reliable message with size of:

byte[ROWS * COLUMNS]

In advance, I appreciate any guidance/suggestions in this matter. This is a difficult issue to search for so some links for future views may be appropriate.