Android :: Get Array NullPointerException At Start

i get NullPointerException at the start of the for where am i going wrong?

public void checkzone(Location loc)
{
X = new List<float[]>() {
};
Y = new List<float[]>() {
};
X.clear();
Y.clear();

float x = (float) loc.getLatitude();
float y = (float) loc.getLongitude();
float A1X[] = {(float) 41.992853, (float) 41.994815, (float) 41.995158, (float) 41.993065};//DOMA..........................