实现标准体重计算器的功能

 效果图：

 

main.xml

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      2 
     
       8     
      
       17     
      18     
      
       27     28     
       
        37     38     
        
         47     48     
         
          56     57     
          
           67 
           
            73 74 
            
             80 81 82 
             
              91 92 
             
            
           
          
         
        
       
      
     

mylayout.xml

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      2 
     
       6     
      14     
      21 
     

strings.xml

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     2 
     
      3 4     
      
       Hello World, Test01Activity!
      5     
      
       标准体重计算器
      6     
      
       计算您的标准体重！
      7     
      
       身高：
      8     
      
       性別：
      9 
     

Test01Activity.java

1 package xiacl.test; 2 /*import 相关class*/ 3 import android.app.Activity; 4 import android.content.Intent; 5 import android.os.Bundle; 6 import android.view.View; 7 import android.widget.Button; 8 import android.widget.EditText; 9 import android.widget.RadioButton;10 11 12 public class Test01Activity extends Activity {13     private EditText et;14     private RadioButton rb1;15     private RadioButton rb2;16     /** Called when the activity is first created. */17     @Override18     public void onCreate(Bundle savedInstanceState) {19         super.onCreate(savedInstanceState);20         /*加载main.xml Layout*/21         setContentView(R.layout.main);22         23         /*以findViewById()取得Button对象，并添加onClickListener*/24         Button b1=(Button)findViewById(R.id.button1);25         b1.setOnClickListener(new Button.OnClickListener()26         {27             @Override28             public void onClick(View v){29                 /*取得输入的身高*/30                 et=(EditText)findViewById(R.id.height);31                 double height=Double.parseDouble(et.getText().toString());32                 /*取得选择的性别*/33                 String sex="";34                 rb1=(RadioButton)findViewById(R.id.sex1);35                 rb2=(RadioButton)findViewById(R.id.sex2);36                 if(rb1.isChecked())37                 {38                     sex="M";39                 }40                 else41                 {42                     sex="F";43                 }44                 /*new 一个Intent对象，并指定class*/45                 Intent intent=new Intent();46                 intent.setClass(Test01Activity.this, Test02.class);47                 48                 /*new一个Bundle对象，并将要传递的数据传入*/49                 Bundle bundle=new Bundle();50                 bundle.putDouble("height", height);51                 bundle.putString("sex", sex);52                 53                 /*将Bundle对象assign给Intent*/54                 intent.putExtras(bundle);55                 56                 /*调用Activity Test01Activity*/57                 /*使用startActivity(intent);就不用返回数据*/58                 startActivityForResult(intent,0);59             }60         });61     }62     /*重写OnActivityResult{}*/63     @Override64     protected void onActivityResult(int requestCode,int resultCode,Intent data)65     {66         switch(resultCode)67         {68         case RESULT_OK:69             Bundle bunde=data.getExtras();70             String sex=bunde.getString("sex");71             double height=bunde.getDouble("height");72             73             et.setText(""+height);74             if(sex.equals("M"))75             {76                 rb1.setChecked(true);77             }78             else79             {80                 rb2.setChecked(true);81             }82             break;83             default:84                 break;85         }86     }87     88 }

Test02.java

1 package xiacl.test; 2 /*import 相关class*/ 3 import java.text.DecimalFormat; 4 import java.text.NumberFormat; 5 import android.app.Activity; 6 import android.content.Intent; 7 import android.os.Bundle; 8 import android.view.View; 9 import android.widget.Button;10 import android.widget.TextView;11 12 13 public class Test02 extends Activity {14     Bundle bundle;15     Intent intent;16     /** Called when the activity is first created. */17     @Override18     public void onCreate(Bundle savedInstanceState) {19         super.onCreate(savedInstanceState);20         /*加载mylayout.xml Layout*/21         setContentView(R.layout.mylayout);22         23         /*取得Intent中的Bundle对象*/24         intent=this.getIntent();25         bundle=this.getIntent().getExtras();26         /*取得Bundle对象中的数据*/27         String sex=bundle.getString("sex");28         double height=bundle.getDouble("height");29         30         /*判断性别*/31         String sexText="";32         if(sex.equals("M"))33         {34             sexText="男性";35         }36         else37         {38             sexText="女性";39         }40         /*取得标准体重*/41         String weight=this.getWeight(sex, height);42         43         /*设置输出文字*/44         TextView tv1=(TextView)findViewById(R.id.text1);45         tv1.setText("您是一位"+sexText+"\n您的身高是"46                 +height+"厘米\n您的标准体重是"+weight+"公斤");47         Button b1=(Button)findViewById(R.id.button1);48         b1.setOnClickListener(new Button.OnClickListener()49         {50             @Override51             public void onClick(View v) {52                 // TODO Auto-generated method stub53                 /*返回result到上一个Activity*/54                 Test02.this.setResult(RESULT_OK,intent);55                 /*结束这个Activity，这样也就回到上一个Activity了*/56                 Test02.this.finish();57             }58         });59         60     }61     /*四舍五入的method*/62     private String format(double num)63     {64         NumberFormat formatter=new DecimalFormat("0.00");65         String s=formatter.format(num);66         return s;67     }68     /*取得标准体重的method*/69     private String getWeight(String sex,double height)70     {71         String weight="";72         if(sex.equals("M"))73         {74             weight=format((height-80)*0.7);75         }76         else77         {78             weight=format((height-70)*0.6);79         }80         return weight;81     }82 }