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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