MainActivity for Triathalon App

package com.example.squirreloverlord.ccarrington1triathlon;

import java.text.DecimalFormat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;

import static com.example.squirreloverlord.ccarrington1triathlon.R.array.LocationSpinner;


public class MainActivity extends AppCompatActivity {

    double CostPerAthlete=725.00;
    int NumberOfAthletes;
    double TotalCost;
    String Location;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final EditText Athletes = (EditText)findViewById(R.id.editTxtAthletes);
        final Spinner LocationSpinner = (Spinner)findViewById(R.id.spinnerLocation);
        Button cost = (Button)findViewById(R.id.btnCompute);

        cost.setOnClickListener(new View.OnClickListener()  {
            final TextView TotalAmount = ((TextView)findViewById(R.id.txtTotal));
            @Override
            public void onClick(View v) {
                NumberOfAthletes = Integer.parseInt(Athletes.getText().toString());
                TotalCost = CostPerAthlete * NumberOfAthletes;
                DecimalFormat currency = new DecimalFormat("$###,###.##");
                Location = LocationSpinner.getSelectedItem( ).toString( );
                TotalAmount.setText("Cost for " + Location + " is " + currency.format(TotalAmount));


            }
        });
    }
}