android资源-BMI计算器

package com.demo.android.BMI; import java.text.DecimalFormat; import android.app.Activity; import android.os.Bundle; import android.text.Editable; 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_calc; button_calc = (Button)findViewById(R.id.submit); button_calc.setOnClickListener(calcBMI); } private OnClickListener calcBMI= new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub EditText fieldheight=(EditText) findViewById(R.id.height); EditText fieldweight=(EditText) findViewById(R.id.weight); TextView result = (TextView) findViewById(R.id.result); double height =Double.parseDouble(fieldheight.getText().toString())/100; //双精度浮点型变量 double weight =Double.parseDouble(fieldweight.getText().toString()); //双精度浮点型变量 double BMI =weight/(height * height); //双精度浮点型变量来存储运算结果 DecimalFormat nf=new DecimalFormat("0.00"); //java内置函数DecimalFormat 将运算结果现实在屏幕上 result.setText("您的BMI值为："+nf.format(BMI)); //通过setText方法讲字符串显示在屏幕上文本 TextView fieldsuggest=(TextView) findViewById(R.id.suggest); 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); } } }; }