I'm using Bundle to send data.
Bundle b = new Bundle();
b.putDouble("x", this.Location.X);
b.putDouble("y", this.Location.Y);
Is key case sensitive?
Bundle and other Key Mapping mechanism are case sensitive.
For more discussion see here
Looks like a simple Map, so probably. Why don't you test it?
EDIT:
The key is a String. "x".equals("X") == false