my first compelte android application

最新推荐文章于 2025-12-19 17:14:39 发布

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这是一个简单的BMI计算器应用程序源代码，使用Java编写并针对Android平台。该应用允许用户输入身高和体重，然后计算并显示BMI指数及健康建议。

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>