根据身高计算体重

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fragment_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.xwy.jisuan.MainActivity$PlaceholderFragment"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:padding="20px"        android:text="计算您的标准体重" />    <LinearLayout        android:id="@+id/linearLayout1"        android:gravity="center_vertical"        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <TextView            android:id="@+id/textView1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="性别：" />    <RadioGroup        android:id="@+id/sex"        android:orientation="horizontal"        android:layout_width="wrap_content"        android:layout_height="wrap_content" >        <RadioButton            android:id="@+id/radio0"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:checked="true"            android:text="男" />        <RadioButton            android:id="@+id/radio1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="女" />    </RadioGroup>    </LinearLayout>    <LinearLayout        android:id="@+id/linearLayout1"        android:gravity="center_vertical"        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <TextView            android:id="@+id/textView1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="身高：" />        <EditText            android:id="@+id/stature"            android:minWidth="100px"            android:layout_width="wrap_content"            android:layout_height="wrap_content">        </EditText>        <TextView            android:id="@+id/textView2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="cm" />    </LinearLayout>    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="确定" />    </LinearLayout>

result.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/sex"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="10px"        android:text="性别" />    <TextView        android:id="@+id/stature"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="10px"        android:text="身高" />    <TextView        android:id="@+id/weight"        android:padding="10px"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="标准体重" /></LinearLayout>

MianActivity.java

package com.xwy.jisuan;import android.support.v4.app.Fragment;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.EditText;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.fragment_main);Button button=(Button)findViewById(R.id.button1);        button.setOnClickListener(new OnClickListener() {public void onClick(View v) {        Info info=new Info();//实例化一个保存输入基本信息的对象                if("".equals(((EditText)findViewById(R.id.stature)).getText().toString())){        Toast.makeText(MainActivity.this, "请输入您的身高，否则不能计算！", Toast.LENGTH_SHORT).show();        return;        }        int stature=Integer.parseInt(((EditText)findViewById(R.id.stature)).getText().toString());        RadioGroup sex=(RadioGroup)findViewById(R.id.sex);//获取设置性别的单选按钮组        //获取单选按钮组的值        for(int i=0;i<sex.getChildCount();i++){RadioButton r=(RadioButton)sex.getChildAt(i);//根据索引值获取单选按钮if(r.isChecked()){//判断单选按钮是否被选中info.setSex(r.getText().toString());//获取被选中的单选按钮的值break;//跳出for循环}}        info.setStature(stature);//设置身高        Bundle bundle=new Bundle();//实例化一个Bundle对象        bundle.putSerializable("info", info);//将输入的基本信息保存到Bundle对象中        Intent intent=new Intent(MainActivity.this,ResultActivity.class);        intent.putExtras(bundle);//将bundle保存到Intent对象中        startActivity(intent);//启动intent对应的Activity}});    }@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}/** * A placeholder fragment containing a simple view. */public static class PlaceholderFragment extends Fragment {public PlaceholderFragment() {}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View rootView = inflater.inflate(R.layout.fragment_main, container,false);return rootView;}}}

Info.java

package com.xwy.jisuan;import java.io.Serializable;public class Info implements Serializable {private static final long serialVersionUID = 1L;private String sex="";//性别private int stature=0;//身高public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getStature() {return stature;}public void setStature(int stature) {this.stature = stature;}}

ResultActivity.java

package com.xwy.jisuan;import java.text.DecimalFormat;import java.text.NumberFormat;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class ResultActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.result);//设置该Activity使用的布局TextView sex=(TextView)findViewById(R.id.sex);//获取显示性别的文本框TextView stature=(TextView)findViewById(R.id.stature);//获取显示身高的文本框TextView weight=(TextView)findViewById(R.id.weight);//获取显示标准体重的文本框Intent intent=getIntent();//获取Intent对象Bundle bundle=intent.getExtras();//获取传递的数据包Info info=(Info)bundle.getSerializable("info");//获取一个可序列化的info对象sex.setText("您是一位"+info.getSex()+"士");//获取性别并显示到相应文本框中stature.setText("您的身高是"+info.getStature()+"厘米");//获取身高并显示到相应文本框中weight.setText("您的标准体重是"+getWeight(info.getSex(),info.getStature())+"公斤");//显示计算后的标准体重}/** * 功能：计算标准体重 * @param sex * @param stature * @return */private String getWeight(String sex,float stature){String weight="";//保存体重NumberFormat format=new DecimalFormat();if(sex.equals("男")){//计算男士标准体重weight=format.format((stature-80)*0.7);}else{//计算女士标准体重weight=format.format((stature-70)*0.6);}return weight;}}

在Mainfest中配置

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