"if'" condition never Go to the Else in android

ive been trying to run this code, but the condition result never going to the else ,even when the value of my slat is 0.0

public void keLogin(){
    if(slat.equals("0.0")) {
        Toast.makeText(getBaseContext(),"pls wait until we know your location",Toast.LENGTH_LONG).show();
    } else {
        Intent keLogin = new Intent(getApplicationContext(), Login_Activity.class);
        keLogin.putExtra("slat", slat);
        keLogin.putExtra("slong", slong);
        startActivity(keLogin);
    }
}