bmi.java file content:
package com.demo.android.bmi; import java.text.DecimalFormat; import android.app.Activity; import android.os.Bundle; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.view.View.OnClickListener; import android.view.View; 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())/100; double weight=Double.parseDouble(fieldweight.getText().toString()); double bmi=weight/(height*height); TextView result =(TextView)findViewById(R.id.result); result.setText("Your bmi is "+nf.format(bmi)); TextView suggest =(TextView)findViewById(R.id.suggest); if(bmi>25) suggest.setText(R.string.advice_heavy); else if(bmi<20) suggest.setText(R.string.advice_light); else suggest.setText(R.string.advice_average); } }; }
main.xml file content:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/height" /> <EditText android:id="@+id/height" android:layout_width="fill_parent" android:layout_height="wrap_content" android:numeric="integer" android:text="" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/weight" /> <EditText android:id="@+id/weight" android:layout_width="fill_parent" android:layout_height="wrap_content" android:numeric="integer" android:text="" /> <Button android:id="@+id/submit" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="计算 BIM 值" /> <TextView android:id="@+id/result" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> <TextView android:id="@+id/suggest" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> </LinearLayout>
string.xml content:
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello World, bmi!</string> <string name="app_name">bmi</string> <string name="height">身高（CM)</string> <string name="weight">体重（Kg)</string> </resources> advice.xml content:
<?xml version="1.0" encoding="UTF-8"?> <resources> <string name="advice_light">you should eat more!</string> <string name="advice_average">you have good healthy</string> <string name="advice_heavy">you should have a diet</string> </resources>
