[android-developers] help......i am a Beginners

[yoyo]

package com.androidyo.firstbmi;

import java.text.DecimalFormat;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Bmi extends Activity {

        /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        Button button=(Button)findViewById(R.id.submit);
        button.setOnClickListener(calcBMI);
    }
    private OnClickListener calcBMI = new OnClickListener()
    {
        public void onClick(View v)
        {
                DecimalFormat nf=new DecimalFormat("0.00");

                EditText fieldheight=(EditText)findViewById(R.id.height);
                EditText fieldweight = (EditText)findViewById(R.id.weight);
                double height = 
Double.parseDouble(fieldheight.getText().toString
());
                height=height/100;
                double weight = 
Double.parseDouble(fieldweight.getText().toString
());

                TextView result = (TextView)findViewById(R.id.result);
                TextView fieldsuggest = (TextView)findViewById(R.id.suggest);
                if(height<=0||weight<=0)
                        result.setText("input wrong");
                else
                {
                   double BMI = weight / (height * height);


             result.setText("Your BMI is "+nf.format(BMI));

             if(BMI>25){
                    fieldsuggest.setText(R.string.advice_heavy);
                   }else if(BMI<20){
                fieldsuggest.setText(R.string.advice_light);
                   }else{
                    fieldsuggest.setText(R.string.advice_average);
                   }
             }

        }

    };
}



MY question:



when runing the app .if i input nothing .it will force close

how can i fix it???
please give me a hang...i am a beginners.thanks

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