Android - unfortunately app has stopped เมื่ื่อรันแล้วทำต่อไม่ได้ครับ ช่วยดูให้ผมที

package com.example.app_project;

import android.os.Bundle;

import android.app.Activity;
import android.view.Menu;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Button;
import android.widget.Toast;
import android.view.View;
import android.view.View.OnClickListener;

public class BMR extends Activity {

	private EditText hView4;
	private EditText wView3;
	private EditText oView5;	
	private EditText tView10;
	private RadioButton rdo0;
	private	RadioButton rdo1;
	private Button aView9;
	private Double x;
	
	private Double y;
	private Double z;
	
	private Double r;
	private Double answer1;
	private Double answer2;
	private Double answer3;
	private Double answer;
	private String to;
	
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_bmr);
		
		hView4 = (EditText)findViewById(R.id.editText1);
		wView3 = (EditText)findViewById(R.id.editText2);
		oView5 = (EditText)findViewById(R.id.editText3);
		rdo0 = (RadioButton)findViewById(R.id.radio0);
		rdo1 = (RadioButton)findViewById(R.id.radio1);
		aView9 = (Button)findViewById(R.id.editText4);
		
		
		aView9.setOnClickListener(new OnClickListener(){ 
				public void onClick(View v){
					calculatekal();
			
		}
				});
		
	}
	public void calculatekal()
	{
		if (rdo0.isChecked()){
		x = 66.0 ; y = 13.7 ;z = 5.0; r = 6.8;
		to = " kal";
		}
		if (rdo1.isChecked()){
		x = 66.5 ; y = 9.6 ;z = 1.8; r = 4.7;
		to = " kal";
		}
		answer1 = Double.parseDouble(wView3.getText().toString())*y ;
		answer2 = Double.parseDouble(hView4.getText().toString())*z ;
		answer3 = Double.parseDouble(oView5.getText().toString())*r ;
		answer = x + answer1 + answer2 + answer3 ;
		
		Toast.makeText(getApplicationContext(),answer + to , Toast.LENGTH_SHORT).show();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.bmr, menu);
		return true;
	}

}