You need to make sure that there is text in the TextEdits before
calling parseDouble because it will throw an exception otherwise.
Something like:
String heightText = fieldheight.getText().toString();
if( heightText != null && !heightText.equals("")){
// do stuff here
}
should work.
On Apr 13, 3:11 pm, yoyo <zjw...@gmail.com> wrote:
> 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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